Orca and salmon recovery workshop (live blog)

Sponsored by the Puget Sound Partnership and organized by Orca Network, the Salish Sea Association of Marine Naturalists, and The Whale Museum, this workshop preceded the 2014 Salish Sea Ecosystem Conference.

photo 2

Daniel Schindler, UW

The “Effects of salmon fisheries on SRKW” report

12:09 Starts with introduction of the science panel members

12:12 We were charged with evaluating the BiOp’s “chain of logic linking Chinook salmon fisheries to population dynamics of SRKW”

Population decline in both NRKW and SRKW was coordinated in late 1990s.

We were blown away by the quality of SRKW demographic data.  This is probably one of the best-studied wildlife populations in the world.

Eric Ward estimated growth rate (lambda) as 0.99-1.04 (mean ~1.017, or ~1.7% exponential growth) for J/K pods and 0.985-1.035 (mean ~1.01, or ~1% exponential growth).  The overall SRKW rate of 0.71% per year might increase to ~1%), but fisheries management changes are unlikely to raise the growth rate to the recovery goal.

There are 1000s of papers about Chinook salmon, but less is know about Chinook topics relevant to SRKWs.  Listed 3 shortcomings.

Kope and Parken summarized Chinook trends for specific stocks important to SRKW.  Coastwide there has been a modest decrease in recent pre-harvest Chinook abundance.  There isn’t much room to lower commercial fishing in a meaningful way (e.g. decrease harvest of 20%).

Correlations between SRKW vital rates and Chinook abundance depends on abundance measure chosen.  Mortality of SRKW should scale non-linearly with salmon abundance, but the existing correlations are linear.

12:38 Questions

Bain: Why weren’t acoustics impacts of fishing vessels considered?  A: I don’t know.  Perhaps because available data did not include fishing boats.

Felleman: Were analyses done using only Columbia Chinook?  A: No, but you should email Eric Ward about that.  You should also be careful about interpreting correlations as causal relationships.  If you look for correlations from 50 different salmon populations, you’ll find strong ones just through random chance.

12:50

Elizabeth Babcock, NOAA

The intersection of salmon and orca recovery

Focus is on Puget Sound stocks.  Locally-developed recovery plans for Puget Sound Evolutionary Significant Unit (14 watersheds from Neah Bay to Point Roberts; 22 populations) reviewed in 2005, then adopted plan in 2007, and are now implementing with partners.

70% of our estuary habitat area in Puget Sound have been lost…

13:00

Lynne Barre, NOAA

13:10

Mike Ford, NOAA

Salmon recovery and SRKW status

Noren (2011) suggest SRKW metabolic demand is 12.6-15.1×10^6 kcal/day =~1000 Chinook salmon/day

Ward looked at all available Chinook time series and found many correlations, including between runs, but the strongest correlations were not with the Fraser nor the Columbia.

Interesting population projection figure from Ward (2013)

Post-workshops we have been looking at trends in other marine mammals: AK and NR KWs increasing, CA sea lions now  ~6x 1975 levels, harbor seals 6-8x…

Overview of salmon status

  • Historic Chinook salmon abundance figure (compiled Jim Myers, NWFSC): Biggest reductions were in Columbia (~-3-5x) and Central Valley (~-3-4x)
  • Bonneville time series (1938-2014) shows abundance declines happened a long time ago (pre-dams!).  2014 levels approaching 1888 average levels!
  • A lot of the historical losses are due to extirpations (Gustafson et al., 2007): biggest extinct populations were in Columbia above Grand Coulee and Snake
  • Run timing changes: Columbia example — ~10x reduction in interior run (above Bonneville) from ~2.5 million to ~200k.
  • Hatchery production rose from 1950 to peak in mid-80s and in 2000 was near 1970s levels (Naish et al. 2007)
  • Puget Sound historical abundance is ~700k (based on cannery pack in 1908); current wild escapement is ~50k; hatcheries add ~300k.

Recovery activities

  • Habitat: 31,000 projects completed at 51,000 locations throughout Pac NW.  Over $1 billion spent on restoration to date.
  • Hatcheries: overall reductions in hatchery releases in last few decades, and limiting genetic impacts on wild fish.  One example of reductions to near zero is on OR coast…
  • Harvest: easiest to change and responsive; examples of successful catch reductions are Hood Canal summer chum.  Coastwide harvest % has decreased by ~factor of 2 over last 30 years
  • Hydro: improved fish passage, predator control, spill, barging; dam removal on Elwha, Condit, Rogue, Sandy, Hood River
  • Heat: potential effects of climate change mostly not great for salmon; summarized by Stoute et al. 2010 and Wainwright and Weitkamp in prep

Budget comparison

  • Orca recovery spending: FY12 1.2M on science/research; ~300k on management/conservation
  • Orca salmon spending: FY12 600M!!  Columbia only is 450M!photo 1

1:40 break

David Troutt, Director of Nisqually Natural Resources (for 35 years) and Chair of SRC (=Salmon Recovery Counci)

WA State salmon recovery — How we work together

2:02

State broken into regions, each with their own recovery plans (developed through the “WA way” involving many stakeholders, endorsed by Feds).  Go to RCO web site for more information.

Study completed in March 2011 estimated costs of all planned regional plans is ~$5.5 billion.  Funds dispersed through Salmon Recovery Funding Boards established in 1999.  Funds come from PCSRF and others…  Note: it is a LOT cheaper to protect than to restore…

10% of Federal grants must be used for monitoring.  Example: About 80% of Nisqually outgoing smolts remain in estuary; 20% seek pocket estuaries elsewhere, but we see almost no returns of fish using the latter strategy.

There is a problem with marine survival in Puget Sound.  We see 95% mortality of tagged out-going smolts between the Nisqually and Port Angeles.  We’re confident that the estuary is in much better shape and 77% of the mainstem is in permanent stewardship, but we’re not seeing any result in the numbers of returning adults!

2:15 Tribal perspectives

Story: a generation of Nisqually fishers have never caught a steelhead.  Annual catches of ~2k by tribes and ~2k by recreational fisheries collapsed (in 1990s?) to total run of ~500, a condition which persists.  The treaties have not been withheld (and the tribes have not “shot at y’all in a long time”).

We need to work together towards ecosystem restoration.  The tribes are interested in actions related to all H’s.  The tribes have been working with the State to adapt how we run hatcheries to support harvest, but also be consistent with recovery goals.  The North of Falcon process is part art, part science, but it is transparent and it works.

Rich Osborne, North Pacific Coast Lead Entity Coordinator (WRIA 20)

WA Sustainable Salmon Partnership — Salmon recovery on the WA coast

2:25

What’s unique about the outer coast in terms of salmon restoration?

  • All 5 salmon species and steel head; none are listed except Ozette sockeye.
  • Large areas are encompassed within tribal lands, which allows alternative restoration strategies.
  • Almost no people!  Only 7000 people on coast with no residential areas
  • Large portions of watersheds in National Park, other large areas in National Forests.

Formed a non-profit to raise money beyond the SRFB: the WA Coast Sustainable Salmon Foundation.  WRIA 21 = Quinalt; WRIA 22&23 Grays Harbor; WRIA 24 Pacific County.

Example projects:

  • Goodman Creek road decommissioning (4 miles of road and fill removed)
  • Quinalt: old logging road and fish passage blockage removal — facilitated by ability for tribe to control local decisions.
  • Grays Harbor: huge estuary Chehalis has spectrum of impacts (industrial, logging, headwaters in National Park), but again not many people
  • Pacific County (Willapa Bay): huge estuary w/few people; mostly Weyerhauser timber operations between pristine upper watersheds and the ocean.

28 Chinook stocks returning only 30-40,000, but could be 100s of 1000s…

An additional 12 million hatchery fish released from coastal watersheds per year

Salmon stronghold study areas (circa 2006)

 

 Jeannette Dormer, Puget Sound Partnership

Salmon Recovery in Puget Sound

2:45

In contrast, there are 4.1 million people in the Puget Sound region: 12 counties, 20 large cities, 100 cities total, 17 treaty tribes, many NGOs; 15 lead entities; Puget Sound Salmon Recovery Council (not the Partnership) is policy body to oversee implementation of the PS salmon recovery plan.

6 salmonid species, 3 listed under ESA (PS Chinook threatened in 1999, Hood Canal summer chum threatened in 1999, 2007 Puget Sound steelhead).

Salmon recovery success example: Puget Sound Acquisition & Restoration (PSAR) Fund.  Regional priority list; increased from $15 million to $70 million appropriated for 2013-2015 biennium

    • 100s of acres of estuary restoration in Snohomish and Skagit rivers
    • Elwha dry lake bed reforesting
    • 3+ acres eel grass on Bainbridge
    • Seahurst seawall removal and restoration

Intersection with orca…

3:05

Jacque White, Exec. Director of Long Live the Kings (used to work at P4PS and Nature Conservancy)

Salish Sea marine survival project

Many partners supporting the coordinating organizations — Long Live the Kings in U.S. and Pacific Salmon Foundation in Canada

“Puget Sound salmon are sick and we don’t know why…”

  • Coho marine survival declined sharply in 1980s from ~3% to <~0.5% and has persisted, while during the same period (1974-2007) WA/BC coastal survival has been fluctuating around a mean of ~0.5%.  There are similar trends for steelhead and Chinook.
  • Declines in Fraser sockeye, steelhead, herring spawning areas, forage fishes, hake, lingcod
  • Rises in Harbor seals, lags, temperatures, and human population
  • Little effort to integrate research efforts
  • Now seeing economic impacts on humans (sports fishing, tribes, First Nations)

Time line:

  • 2007 State of the Salmon in 2007 focused on interactions of wild and hatchery salmon
  • 2012 fall workshop led to idea of a transboundary project to increase survival in the Salish Sea, improve accuracy of adult return forecasting, and assess success (or failure) of existing salmon recovery efforts.
  • 2014 Comprehensive planning
  • 2015+ Implementation of research

Hypotheses (trying to identify factors that control salmon and steelhead survival that can be managed)

  • Bottom-up processes (PDO, environment, forage fish changes to which salmonids haven’t been able to compensate)
  • Top-down (predation…)
  • Other factors (toxics, disease…)

Research activities

  • Focus on juvenile fish
  • Predation of seals on steelhead

3:45 break

Panel discussion (audio recording: .ogg [~68 Mb] | .mp3 [~34 Mb]; responses are hard to hear for some panelists who did not use microphones)

3:58 Begin

5:14 Final comments and next steps (also included in audio recordings)

 

 

 

 

 

 

 

 

 

 

 

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2013: the year southern ‘resident’ killer whales were transient

The year 2013 was an exceptionally unusual one in the world of southern resident killer whales and Pacific salmon. Most noticeably, the southern residents returned to the Salish Sea later than normal, raising concerns among conservationists. Throughout the summer, researchers and whale watch operators noted that the whales were present less than normal and the duration of their visits to the Salish Sea were abbreviated.

Meanwhile, the Chinook salmon runs on the Fraser plummeted while 80-year record returns were counted on the Columbia at the Bonneville dam fish ladder. Combined with new evidence from satellite tags that the southern residents are focused on Columbia salmon during the spring months, the sighting patterns of 2013 may indicate a transition for the urban estuary known as the Salish Sea — from one with “resident” orcas to one with southern “transient” fish-eating orcas.

Killer whale trends

Based on data from the Orca Network sighting maps from the past decade (see figure below), records were set or tied in 2013 for the least number of days spent by southern residents in the historic core of their summer habitat (the west side of San Juan Island in Haro Strait). The SRKWs were seen only once in March and not at all in April. Even more shockingly, they showed up only 5 times in May (a record low) and were observed 15 times in June, a low level not seen since 2001.

The same data show downward trends in monthly sightings over the last decade. With the exception of a high in 2011, the March prevalence has been flat or decreasing. There are stronger, more continuous downward trends in April and May sightings.

We used the OrcaMaster database maintained by The Whale Museum to look for trends in sighting “gaps” — the number of consecutive days between sightings of J pod members within the Salish Sea.   Val plotted running averages of 2013 gaps versus a historic average (1992-2012) and found that in the spring of 2013 sighting gaps were 2-5x longer than the average.  Only during and after September of 2o13 did the gap return to a normal duration.  (Maybe we should look at trends in Salish Sea chum run?)

Historic trends in J pod sighting gaps (Val Veirs, using R and ggplot)

Historic trends in J pod sighting gaps (Val Veirs, using R and ggplot)

Chinook trends

One way to characterize the foraging conditions the SRKWs experienced in 2013 within the Salish Sea and on the outer coast is to examine the Chinook salmon counts from the Fraser and Columbia rivers. The Albion test fishery on the Fraser provides a proxy for the abundance of Fraser Chinook, the primary prey of SRKWs in the Salish Sea from spring through the summer . The fish counts at the Bonneville dam on the Columbia are a proxy for the abundance of Chinook on the outer coast of Washington.

As marine naturalists like Jane Cogan and Monika Wieland have pointed out, 2013 was an exceptionally bad year for Fraser Chinook returns. The fish arrived late and the cumulative returns were well below this historic average and only slightly better than in the worse year on record, 2012.  The highpoint of the 2013 run was the peak around the 3rd week of August that may also be related to a pulse of Chinook recorded in the first two weeks of July off southern Vancouver Island (in the Area 20 test catch fishery).

In contrast, adult and jack Chinook abundance in the Columbia River has been on the rise for the past couple decades, with 2013 standing out as a record-setting year for adult Chinook.

Daily Chinook counts at Bonneville show that while most of the record-setting abundance was due to the fall run, the spring run also had peaks well above the 10-year average.

bonneville-2013-chinook-vs-historic

The spring run passed Bonneville from late April to late May, 2013.  This timing is consistent with the timing of the spring Columbia Chinook run in 2012.  Since Bonneville dam is about 200 km upstream from the river mouth and adult Chinook swim at about 0.5 m/s, we could expect that the returning Columbia Chinook were in the ocean at least until about a week before they reached Bonneville ( 200,000 m / 0.5 m/s = 400,000 seconds = ~5 days).  So where were the southern residents in March and April of 2013, since they weren’t being sighted in the Salish Sea?  We don’t know about J and L pods, but the satellite tag deployed on K25 indicates the likely position of K pod (up until April 4).

The answer is: during March, 2013, K25 was spending a lot of time going back and forth along the continental shelf of Washington (and to a lesser extent Oregon) with a track that centered on the mouth of the Columbia River.

We need to know more about when the returning Columbia fish are on the continental shelf and accessible to the southern resident killer whales.  But these salmon trends from the region’s biggest rivers combined with migratory patterns of the orcas strongly suggest that the southern resident killer whales may be happy to move their “residence” to wherever the eating is best!  Perhaps we are watching them become southern transient fish-eating killer whales?!

Anecdotal observations of orca-salmon interactions

When the fish-eaters were around during the summer of 2013, they displayed some unusually aggressive foraging. A (potential) prize Chinook salmon was taken off a derby fisherman’s line and became the focus of a KPLU radio story and an impressive photo of the one that was eaten away…

The part that didn't get (taken) away.  (credit: Kevin Klein)

The part that didn’t get (taken) away. (credit: Kevin Klein)

This local predation event was a first for Washington State (as far as we know), though it was comparable to one by Alaskan fish-eating killer whales. In the video below, the Alaskan whales were foraging amongst fishing vessels and happened (probably visually) upon a large hooked Chinook. (Mute your speakers if you don’t want to hear angry and amazed fishermen cursing.)

Later in the summer of 2013, back in Washington, a whale watch captain obtained this video of southern resident killer whales pursuing a large (likely Chinook) salmon alongside the boat —

Could these uncommon foraging observations indicate that the southern residents were having a tough time finding enough to eat in the Salish Sea?  We’d be interested in hearing from local fishers about how often they’ve had fish taken off their lines by Southern Residents.  Monika assures us though that it is common to observe SRKWs pursuing salmon around and underneath whale watching boats, so maybe we should attribute the second video to more typical foraging and take it as evidence that orca-salmon interactions in the fall of 2013 were more typical than earlier in the year.

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Video of farewell ceremony in fall 2005 stabilized

Southern resident line up. (credit: Center for Whale Research)

Southern resident line up. (credit: Center for Whale Research)

A couple years ago Val put a bunch of effort into stabilizing a video of some rare southern resident killer whale behavior that Beam Reach observed during our first field program in fall, 2005.  In support of an upcoming fundraiser for The Whale Museum, we have uploaded the stabilized version to YouTube and then stabilized it as second time using YouTube’s editing enhancement.  (The original, shaky footage is also stabilized as of 2014, but only using the secondary YouTube stabilization.)

We hope the double-stabilized version (embedded below) doesn’t make you too seasick.  You may also enjoy the links below and appended background information re-posted from what was originally published at orcasphere.net.

Stabilized video

Video credits go to Beam Reach students Brett Becker and Courtney Kneipp. Still photo credits go to the Washington State Department of Ecology and Iris Hesse of the Center for Whale Research. Listen for a very unusual simultaneous call made by many individuals during the last minute of the recording.

Related links

Re-printed blog post from orcasphere.net

Originally posted on May 16, 2006 —

One of the most remarkable behaviors of the southern residents is the “greeting ceremony” in which two groups of orcas line up facing each other and then mingle together. This article describes a similar “ceremony” acoustically and visually (video; photo gallery), and then discusses whether it may have been related to a “greeting,” a “goodbye,” or a more complex combination of activities.

I offer it here in the hope that others who witnessed this particular event may further consider what occurred. Please feel free to comment on this article and/or contribute your thoughts via the discussion forum. Insights from other accounts of different “ceremonies” performed by the southern resident (or other) orcas would also be welcome. Perhaps we will piece together a publishable story?

On October 4, 2005, only a week into a month of sailing with the southern residents, students and teachers of the Beam Reach marine science and sustainability school approached San Juan Island along with members of J and L pods. The Beam Reach research vessel, the sailing catamaran Gato Verde, paralleled the orcas as they moved northward from Salmon Bank along the west side of San Juan Island during the mid-afternoon. In the early evening, starting around 4:30pm PST, the pods began to concentrate within 100 meters of shore below Hannah Heights.

The “ceremony” that we observed (along with Tom McMillen, observers from the Center for Whale Research, and Sharon Grace [and others?]) was similar to “greeting ceremonies” that sometimes occur in the spring as the southern residents return to the Salish Sea from their winter ranges. One group of at least 9 adults and one calf (probably a subset of the group that had been traveling northward with us) congregated within 100 meters of shore ~0.5km southeast of a promontory with abundant driftwood (48o 29.65N, 123o 7.62W). They remained on the surface, gathered into an extremely tight group, traversed the shoreline southward for a few minutes, then doubled back to the north. Meanwhile, a different group of at least 9 adults rounded the driftwood point, heading south, and began to congregate in a rough line just south of the promontory’s rocky bluffs. They, too, remained largely on the surface, drew together in a line, and proceeded slowly southeastward toward the southern group. When they were about 25m apart, the southern group lunged forward, submerged, and quickly met the northern group. The two groups mingled, turning quickly and making brief dives, and remained together for an extended period (at least 15 minutes — we left at ~5:15pm to make port before nightfall — and probably much longer).

The ceremony was documented by Beam Reach with still photographs, digital video, and stereo underwater sound recordings. Preliminary analysis of the still photographs and video suggests that at least J40, J14, and L41 were part of the southern group. Tom McMillen of Salish Sea Charters with Iris Hesse and EEH (??) of the Center for Whale Research (CWR) were drifting near the northern group and photo-identified many of its members. Based on an initial examination of still photographs taken of the combined groups, Dave Ellifrit of the CWR noted that L84, L41, L90, L72, L55, L82+calf, L25 with L41, and Raggedy (K40) were present. Any additional photo-identification (and associated) debate is welcome!

An interesting aspect of this event, first pondered by Tom McMillen (and later discussed with Ken Balcomb and Dave Ellifrit?), is that it approximately coincided with the last time that the matriarch L32 was seen. Earlier in the day (about an hour before the ceremony began?), Tom observed L32 with son L87 and noticed that she was emaciated and had a weaker-than-normal blow. CWR photographs confirm that L32 had a sunken blowhole area (“peanut head”) that day. L32 was not observed after the ceremony and L87 was observed the next day (or maybe 2 days later?) without L32, so L32 is now presumed to be dead. Could we have witnessed a “goodbye” ceremony?

Perhaps, but the CWR photographs reveal that the ceremony also involved foraging (birds hovering over orcas at surface) and sexual activity (sea snakes). Beam Reach video shows traveling behavior, milling, tail lobs, and pectoral fin slaps. There was a lot of acoustic activity prior to the meeting of the two groups, including abundant echolocating and intermittent calls, and an amazing coordinated acoustic event in which many individuals call simultaneously (without an obvious cue).

I’ve created this movie that juxtaposes the best of the Beam Reach video and underwater sound. Please note, however, that I was unable to synchronize the sound and video. I am tempted to associate the simultaneous calls with the dynamic lunge of the two groups together, but (I regret) there is currently no way to know whether that is right. Video footage was acquired by Beam Reach students Brett Becker and Courtney Kneipp. Acoustic data is from 2 ITC hydrophones mounted 1.4m apart on a horizontal pipe at 4.4m depth. (The engine noise at the beginning of the movie is from the Beam Reach research vessel.)

Please don’t hesitate to comment, email, or start a discussion thread if you have information or ideas about this fascinating behavior of the southern residents.

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Marine water workshop – Salish Sea situation in 2013

Notes by an oceanographer from an upper trophic (orca) perspective during the outer-coast/less-local/more-regional portion of the annual meeting of the Marine Waters Monitoring Workgroup of the Puget Sound Ecosystem Monitoring Group (PSEMP) at APL/UW on 3/28/14.  This meeting is a rare effort and opportunity to synthesize ocean observations from the previous year and across the Salish Sea and outer coast of the Pacific Northwest region (with an over-emphasis on Puget Sound).  I was not able to stay for the rapid-fire talks related to plankton & pathogens (e.g. harmful algal blooms) or water quality.

Freshwater inputs — Ken Dzinbal

In long-term medians from rivers across region, the overall long-term seasonal pattern is a dry period in Sep-Oct (extending into late fall for some rivers), then a wet spring with big storm pulses Feb-June.  In 2013, Fraser mean daily discharge at Hope (above tidal influence) peaked in late May, ~1 month earlier than historic median.

Fred Felleman mentioned that 2013 was a terrible year for Fraser river Chinook and a bumber year for Columbia Chinook, and that the Southern Resident Killer Whales (SRKWs) responded one would expect for the “best salmon samplers on the planet”  — they were rarely sighted in inland waters and tracked often on the outer coast near the Columbia river mouth.  PSC Fraser panel is a good source of historic data on Fraser flows.

Boundary conditions & water masses — Skip Albertson

Less upwelling in Aug/Sep; SW winds!  Usually we have N winds and upwelling in September, but we almost had down-welling due to unusual winds out of the southwest.

We looked at Pacific Decadal Oscillation (PDO), and index that changes slowly.  Initially there was colder water up against the coast, but then offshore waters got warmer and warmer.  Overall in 2013, the PDO index was slightly lower than long-term means.

Cha’ba mooring (offshore Washington) — John Mickett

Temperature-Salinity plot for all of Puget Sound shows median values near 11 oC and 30 psu with low (6.5 mg/l) dissolved oxygen (DO) levels.  This suggests a stronger-than-usual influence of oceanic water.  Christopher Krembs pointed out that the goal is to start looking at Puget Sound water properties in terms of water masses that may traverse the different basins, rather than

The big story on the outer coast in 2013 was the hypoxia.  John showed pictures of many dead Dungeness crabs washed up on Ruby Beach.  Looking at data from 3 and 84 meters, you see phytoplankton blooms (chlorophyll concentrations up ~20 micrograms/l).  In mid-August we saw DO levels drop to ~1 ml/l a level which stresses or kills organisms.  At about the same time we saw very unusual warm surface water temperatures (up to 16-18 oC, well above the long-term means of ~12 oC) which were due to the wind reversals that led to stratification and subsequent solar-heating.

Upwelling comes from 30-40m (ref Ryan McCabe) and has much higher DO than what we saw.  That’s why we think these low DO events in the shallow water were advected horizontally, having formed somewhere else.

End of May (5/31)  and beginning of July (7/1) sees Columbia River plumes in surface waters.  Are these related to court-ordered dam releases?

San Juan channel — Jan Newton (slides from 2013 research apprentices)

North station off NE San Juan Island; South station just south of Cattle Pass (tends to picks up Pacific Ocean influence)

Normally, Fraser plume is advected south in the summer and north in the winter, with associated up-/down-welling changes.  It creates a strong pycnocline near 30-40m.

Redfield AC (1950) Note on the circulation of a deep estuary: the Juan de Fuca-Georgia Straits

In 2013, TS plots from Centennial calibrated CTD show that 2012 was an anomalously cold year.  The 2013 T-S ranges were +1 oC higher, and slightly fresher.  In mid-October the cold 2012 water was ~0.5oC lower than long-term medians.

PDO shift from + to – values near 2007 correlates with warmer to cooler transition in inland water temperatures.  There are initial hints that during the inland cooler periods we see higher seabird (and other upper trophic level animal?) populations.

Harbor porpoise acoustic studies — Aileen Jeffries

CPODs and land-based visual observations.  CPODS for 3 years in Burrows Pass, also at Biz Point and now at PTMSC

Harbor porpoise population plummeted in 50s, were nearly gone in 70s and now seem to be on a rebound.

Acoustic detections from Burrows typically show nighttime peaks of ~50 minutes/hour and 1/10th those levels during the day.

Click rates of 400-600 clicks/s during foraging; about 20 clicks/s otherwise (histogram).

Seasonally they are less present during the summer (low in May/June) than winter at Burrows Pass (based on visual sightings).

Primary prey is herring, smelt, and sand lance.  Florian Granger (did PhD in Europe on harbor porpoises) says that they often travel in groups of 3.

What about anchovies and the possible decadal dynamics on the outer coast?

John Mickett asked why the diurnal pattern is so strong in Burrows Pass.  Aileen thought that they were targeting animals that follow the vertical migration of zooplankton to surface waters at night, but also suggested day-time boat interference might be a factor (but implied they had not quantified boat traffic).  Dzinbal suggested that squid might be following the zooplankton…

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Shore tethering of Vemco receivers: lessons learned

During our study of adult salmon movements in the San Juan Islands, we tested a novel method of deploying Vemco (VR2W) receivers. With permission from local land-owners, we used free climbing equipment or pitons to anchor a crab pot line to the rocky shoreline, marked it as fish research to discourage vandalism or theft, and then used it to tether the Vemco receiver mooring to shore. This allowed us to deploy and recover the mooring from a small boat, saving the cost of divers and simplifying the re-location of a mooring.

Schematic of shore tether method

Schematic of shore tether method

Tethered mooring materials, methods, and locations


Salmon school passes around the fish tag receiver mooring at Lime Kiln State Park

Project map (Google map in which green markers denote deployed receivers, magenta are recovered from our UW/NOAA collaboration (2011-2013), yellow were planned sites for 2011-12, red are other potential sites, and blue are landmarks):

View San Juan fish tag receiver deployments in a larger map

Deployment method

A typical deployment involved dropping a researcher off on shore. While the boat driver stood off and prepared the mooring, on shore the researcher created a climbing anchor using cracks of convenience in the rocks and/or trees. Aluminum alloy wired nuts, chocks, and hexes were the most common anchoring devices. Both seemed to weather the salt-water environment very well, though the stainless wire rope in the nuts and chocks showed some signs of corrosion after about a year in the field. Once set, the anchor was attached to a length of leaded crab pot line, a float was tied to the end, and the float was cast well offshore. The driver then returned to pick up the researcher and together they retrieved the float. The shore tether was then tied to the mooring and as the boat backed away from shore towards the deployment point, line and anchors were deployed until adequate water depth was attained. Finally, the mooring assembly was lowered into the water and released. (Early on we used a slip line, but eventually just dropped the moorings as they seemed to sink vertically and not too fast.)

Recovery method

A typical recovery also began by dropping a researcher on shore. First the anchor was removed or checked and maintained. Then the tether was disconnected from the anchor and attached to a float. The float was cast offshore, the researcher picked up, and the float brought onboard. Then the dirty work of hauling up the mooring began. A bow roller helped, as did having two people work together. An important innovation was a short piece of PVC slit so that it could be passed around the line and used to strip fouling off as the line was brought aboard. Once the mooring was raised, the receiver could be removed or swapped. Then the mooring assembly could be stored or immediately reused in a new deployment.

With a small boat capable of doing 25 knots on flat water, this method allowed us to service 4-6 receivers per day. At the end of the study, we were able to retrieve 8 receivers in a single day trip beginning and ending in Seattle.

Lessons learned

  • Galvanic corrosion (between a stainless steel shackle and a length of galvanized chain) caused the loss of Lime Kiln receiver (luckily it was found on a beach near Victoria).  Connect the Vemco to the mooring anchor using a single type of metal (e.g. a galvanized shackle).
  • Mooring depths should be at least 5-8 meters deep especially in high surge environments.  Shallow deployments resulted in the loss of 2 False Bay receivers (one was found on a nearby beach).
  • Dive recoveries were required 4 times, primarily because of chafe (Iceberg, Sucia, Sentinel, Patos).  Minimize tension and contact with rock edges?
  • Human disturbance rare (despite faded labels, only Turn Point and Obstruction were disturbed; neither was removed).

Examples of different amounts of fouling

The amount of marine organisms that colonize the mooring float, receiver, and/or anchor — as well as the line — varied tremendously between sites.  Geography and oceanography are likely the controlling factors, but there was some suggestion that deeper deployments had less growth overall, and especially reduced amounts of brown algae colonization.

Undergraduate involvement

Unlike diving, this method allows students to assist in deployments and recoveries without specialized training. The method helps motivate new knot tying skills as well as small boat operations.

While Beam Reach students have not yet utilized data from the San Juan salmon tracking study, we hope that the Hydra database will facilitate that. To date, our only student projects using Vemco data came from our own tagging of ling cod at Lime Kiln State Park with pressure-sensing tags and monitoring achieved with a VR100 system.

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Salmon field work ends with winter dives

Yesterday David Howitt and his crack team completed the retrieval of the last couple Vemco receivers that were being used to track adult salmon in our collaborative fish research with UW and NOAA/NWFSC.  Here is David’s field report, along with some great photos:

  • Boat operator and two divers depart from Roche 1100, return Roche 15:30 – 4 1/2 hours
  • 2 Dives, 2 retrievals, pretty straight forward with finding near shore anchor block early in dive at Succia. Sentinel found drifting line, went down to 60 feet and were lucky
  • Will deliver pier blocks, Vemcos and tanks to Val tomorrow
  • found one weight belt at Succia, lost one knife.
  • Succia Vermco SN# 100913
  • Sentinel Vemco barnacle encrusted
  • Pouring hot tea into gloves really helped
Dive stats:
#1 Sucia,  11:57 minutes,     41.56’,          46 degrees in water.
#2 Sentinel,  12 minutes,          62.25’,          45 degrees in water.
Note the water temperature!  Bravo to David and his tough team for finishing the field work in the depths of winter!!
Divers atop the rock outcrop which served as shore anchor for the Sucia receiver.

Divers atop the rock outcrop which served as shore anchor for the Sucia receiver.

 

Encrusted receiver and float atop dive tanks

Encrusted receiver and float atop dive tanks

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Map showing all the receivers retrieved (in magenta) at the end of our San Juan Island salmon tracking study.  Only one receiver remains -- at Lime Kiln.

Map showing all the receivers retrieved (in magenta) at the end of our San Juan Island salmon tracking study. Only one receiver remains — at Lime Kiln.

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A new door to acoustics at Lime Kiln State Park

Today the Whale Museum Research Curator Eric Eisenhardt and his son Given helped install a new door on the acoustics shed adjacent to the Lime Kiln lighthouse. While the Beam Reach students had given the shed a face lift a few years ago (de-mossed roof, new paint, better drainage), the old door had been looking severely abused by the southerly storms and sun for a long time. The Whale Museum procured a new door about a year ago and I agreed to fiberglass it so it could better stand up to the elements and Neptune’s wrath.

After measuring and planning a bit with Eric, Liam, Bre, and Carrie lent hands with a absolutely STUNNING outcome: the door fit perfectly on the very first try! Normally, I gather there is some back and forth on mortice depth, planing the frame, or adjusting strike plates, but it all just worked. We screwed in two screws and the door swung right into its frame. We swung it out and put in the rest of the screws, and it still swung into the frame with only a gentle push from the wind. Then we put the handle back on and it swung in and clicked shut. STUNNING.

Anyways, it will need some paint (and a little polyurethane to protect the door label Jenny designed), but the door is in place! A special thanks to Bre for volunteering to dispose of the door in a ceremonial fire at her place.

LK-shed-door-installed

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The Second Summer

 

Southern Residents on the west side of San Juan Island, WA

Southern Residents on the west side of San Juan Island, WA

Summer brings many things to the San Juan Islands… Sunshine and warm weather grant us long days, gardens and fields full of greens and flowers, and an ocean brimming with life. The Salish Sea undergoes a boom of productivity in the summertime. As the phytoplankton bloom, the forage fish prosper and salmon begin to pump through the winding channels and straits, making their way back to natal streams to spawn. And who loves salmon more than we do? The Southern Resident Killer Whales, and so as they return to the Salish Sea, I follow suit, returning to the lighthouse and Lime Kiln State Park for the second summer.

 

Lime Kiln Point State Park, WA

Lime Kiln Point State Park, WA

Lime Kiln Lighthouse, for those who aren’t familiar, is on the west side of San Juan Island in Washington State. The Southern Resident killer whales (SRKW), an endangered population of orcas, often pass the lighthouse in the summer time as they chase after their prized prey, Chinook salmon. Being able to watch the whales from shore makes the lighthouse an icon of the island, and an ideal location to conduct research. This summer I am lucky enough to return to the lighthouse and my research project from last summer to work with the Beam Reach Program and The Whale Museum again as a University of Washington Mary Gates Research Scholar. Both Beam Reach and the Whale Museum support the Salish Sea Hydrophone Network, which has a hydrophone array in the water that I am using to record SRKW vocalizations and monitor underwater sound here at the lighthouse.

 

Just like last summer, my first full day back at the lighthouse I was lucky enough to have whales pass by. We heard them coming from a mile away, literally, as they passed the Orcasound hydrophone and Center for Whale Research heading south down the west side of the island. Members of L pod passed us by in a fairly quick, yet exciting encounter. The whales were incredibly vocal, producing lots of pulsed calls, squeaks, and echolocaiton clicks. A few individuals even breached, although it was off in the distance. I couldn’t have asked for a better first day back. That evening, as L Pod made their way back out to sea, a few transients crept along the west side. Although they never quite reached the lighthouse, I got a peak at them with my binoculars. The rest of the week was pretty slow here at Lime Kiln. A sub-group of L pod, known as the L-12s, was hanging around on and off last week, but they seem to prefer the southwest side of the island to the lighthouse, although they did make their way north for the Orca Sing celebration Saturday evening.

Since then, the lighthouse has been quiet; the days have been spent gearing up for the summer, talking with visitors, and thinking about the Southern Residents and their relationship with the ecosystem. Whale activity has been relatively slow for the month of June this year and it has me, and others, scratching our heads. What is keeping the whales away from the west side? Is there not enough salmon for them to eat? Are there too many boats? Have they found a better place to hang out for the summer? Whatever the reason, I hope they start shuffling the west side again soon! Help me, and other scientists, monitor killer whale activity by listening to the Salish Sea Hydrophone network, logging your observations, and sending out email alerts when you hear whales.

 

Solo Sunset

Solo Sunset

As I was writing this blog post, we got word of L-Pod in the Strait of Juan de Fuca. I am hoping they continue swimming east until they arrive back here at Lime Kiln. Maybe J-Pod and K-Pod are following them in? Until then, I will keep listening to the hydrophones and thinking about what they might be up to out in the ocean.

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L-pod killer whale (L-112/Sooke/Victoria) dissection videos

Today (3/7/2013) marks the anniversary of the cranial dissection of L-112, a 3-year-old southern resident killer whale that was found dead at Long Beach on February 11, 2012.  More than a year after her death, we are still gathering information about her case and many questions remain unanswered.  Acoustic recordings made on the outer coast that winter are undergoing or await analysis and publication, final details from the initial and cranial necropsies have not been fully reported, and CT scans and dissection of the middle/inner ear bones are pending.  There is not yet scientific consensus regarding key questions, including “What was the cause of her trauma?” and “Approximately how long was she dead before being discovered on the beach?”

In pursuit of answers and as a contribution to gathering all relevant data, today we present the edited footage from the cranial dissection of L-112/Victoria/Sooke and offer the raw footage to interested parties.  Below is a 1-hour-long (1:09:03) distillation of almost 5 hours of raw footage from two Flip HD cameras.  This is a synopsis of the dissection, including all audible commentary regarding trauma observations made by members of the necropsy team.

Killer whale L-112 cranial dissection from Beam Reach on Vimeo.

The synopsis is mostly chronological, but some effort has been made to group footage anatomically, with an emphasis on sound production and reception. There are titled sections on the following topics:

  • 0:00:16 Disclaimer and introduction
  • 0:05:57 Sampling blubber and skin (for Ted Cranford)
  • 0:07:29 Removal of skin and blubber
  • 0:13:30 Examination of the blow hole
  • 0:14:24 Dissection of the melon
  • 0:16:56 Phonic lips (with insights from Jason Wood)
  • 0:22:49 Hemorrhage observations
  • 0:24:40 Melon and eyes
  • 0:29:54 Sub-mandibular dissection
  • 0:32:54 End of day 1
  • 0:33:16 Removal of eyes
  • 0:34:18 Melon and phonic lips
  • 0:36:55 Tongue, mandible, and pharangeal area
  • 0:45:01 Phonic lips dissection (including esophageal hemorrhage)
  • 0:49:17 Dissection of auditory bullae (bony structures containing middle and inner ear)
  • 0:57:49 Upper jaw teeth (12 on each side!)
  • 1:01:04 Narration: transition from bullae to brain
  • 1:01:55 Discussion of inner ears
  • 1:04:35 Removal of the brain

We have not included the archived footage from live-streaming of the necropsy, nor have we incorporated the many still photographs that were taken by Beam Reach staff, Sandy Buckley the necropsy team photographer, or others who documented the dissection. We welcome further efforts to assimilate all available information and in that spirit have included the above video and all raw footage collected by Beam Reach in our web-site-wide creative commons license (non-commercial attributed derivative works are permitted).

Later this spring in partnership with zoologist Dr. Kevin Flick of Poke the Dead Thing we plan to release a shorter (~20 minute) version of this footage for interested 6-12th-grade educators and marine naturalists. Key anatomical footage will be supplemented with diagrams, animations, and descriptions of bioacoustic functionality from the recent primary literature. In the interim, students and educators may enjoy studying the DOSITS overview of cetaceans’ fully aquatic ear and marine mammal sound production.

Credits and related links:

Salmon detector replaced at Orcasound

Another Vemco fish tag receiver was replaced today, helping prepare for another season of tracking blackmouth (resident Chinook salmon) in the San Juan Islands. This wintertime field work is part of a collaboration between Beam Reach, Tom Quinn’s lab at the University of Washington, and Kurt Fresh and Anna Kagley of NOAA’s Northwest Fisheries Science Center.  You can follow our efforts at http://www.beamreach.org/fish-research

David Howitt and I dove from Val’s and Leslie’s shoreline (Orcasound, about 5 km north of Lime Kiln) into a sunlit, calm, and clear Haro Strait in search of a tether which was torn from its shore anchor last year.  Luckily we found a frayed knot of the old line still attached to a sub-tidal boulder.  Trailing a new tether (0.5 cm crab pot line) fed to us from shore by Ali and Val, we were able to follow the old tether out about 30 m to find a Vemco receiver (#100463) still attached to its concrete anchor at a depth of 8 m.

Old Vemco

Old Vemco

New Vemco

New Vemco

Interestingly, the concrete block (a 25 kg custom-cast 30 cm square about 15 cm thick) had been flipped over.  This could have happened when the lowering line was slipped last spring, or perhaps the currents tipped it over.  Also, the stainless steel snap shackle was still attached to a stainless steel U-bolt that was cemented into the block, but there was clear evidence of galvanic corrosion.  Future moorings should avoid such metal-metal contact, even for similar noble metals like slightly different types of stainless steel.  The best way we’ve to avoid corrosion but make swapping receiver-float assemblies is to drill through a pier block and then thread crab pot line up through it to provide an attachment loop for a snap/shackle.

We removed the old VR2W and replaced it with a new one (#101594), being sure to back up the corroded loop with the end of the crab pot line.  Then we swam back to shore and secured the crab pot line to a shore anchor (piton in an old bolt hole).

New shore anchor

New shore anchor (with hydrophone pipe in background)

Unfortunately, no data was immediately available from the recovered VR2W because the receiver’s bluetooth chip has failed.  The battery was discharged to such an extent during the deployment that the receiver went into what Matt at Vemco described as a “brown-out mode.”  This apparently is known to corrupt the bluetooth chip on the receiver motherboard and requires returning the receiver to Vemco for a new board (~$250 Canadian).  So, we’ll have to await repairs before we know whether any fish were detected at Orcasound in the last year or so.

 

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