Physical data (sex, weight, tag ID number) from Harbor Seals tagged in the San Juan Islands, 2007-2008

Website: https://www.bco-dmo.org/dataset/3794
Data Type: Other Field Results
Version: 1
Version Date: 2012-11-26

Project
» Responses of Seals and Sea Lions to Increased Rockfish Density (Seal_response_to_prey)
ContributorsAffiliationRole
Acevedo-Gutierrez, AlejandroWestern Washington University (WWU)Lead Principal Investigator
Bromaghin, Jeffrey FUnited States Geological Survey (USGS)Co-Principal Investigator
Jeffries, Steven JWashington Department of Fish and WildlifeCo-Principal Investigator
Kennish, John MUniversity of Alaska, Anchorage (UAA)Co-Principal Investigator
Lance, Monique MWashington Department of Fish and WildlifeCo-Principal Investigator
Levin, Philip S.National Marine Fisheries Service (NMFS)Co-Principal Investigator
Rauch, ShannonWoods Hole Oceanographic Institution (WHOI BCO-DMO)BCO-DMO Data Manager

Abstract
Physical and identifying info for Harbor Seals tagged and tracked in the San Juan Islands from 2007 to 2008; includes sex, length, weight, pelage description, and tag ID numbers.


Coverage

Temporal Extent: 2007-04-04 - 2008-03-13

Dataset Description

Physical and identifying info for Harbor Seals tagged and tracked in the San Juan Islands from 2007 to 2008, includes sex,  length, weight, pelage description, and tag ID numbers.


Acquisition Description

The methods below are further described in Peterson et al. (2012), Ward et al. (2012), and Thomas et al. (2011):
To estimate the movement behavior of Harbor Seals, adult seals were captured in 2007 to 2008 at several sites in the San Juan Islands: Padilla Bay, Bird Rocks, Belle Chain, and Protection Island. Several methods were used to capture seals, including boat rushes, beach sienes, and tangle-nets. Captured seals were sexed, weighed, and measured. Seals were classified as adults if they weighed more than 50 kg. All animals were flipper-tagged with unique ID numbers. Adult seals were tagged with time-depth recorders, and satellite tags were glued to the animals.

References:
Peterson, S., Lance, M. M., Jeffries, S. J. & Acevedo-Gutierrez, A. 2012. Long distance movements and disjunct spatial use of harbor seals (Phoca vitulina) in the inland waters of the Pacific Northwest. PLoS ONE 7: e39046. DOI: 10.1371/journal.pone.0039046
Thomas, AC; Lance, MM; Jeffries, SJ; Miner, BG; Acevedo-Gutierrez, A. 2011. Harbor seal foraging response to a seasonal resource pulse, spawning Pacific herring. Marine Ecology-Progress Series, v.441. p. 225. DOI: 10.3354/meps09370
Ward, EJ; Levin, PS; Lance, MM; Jeffries, SJ; Acevedo-Gutierrez, A. 2012. Integrating diet and movement data to identify hot spots of predation risk and areas of conservation concern for endangered species. Conservation Letters, v.5, p. 37. DOI: 10.1111/j.1755-263X.2011.00210.x


Processing Description

BCO-DMO made the following modifications to the dataset:
- Changed parameter names to conform with BCO-DMO conventions;
- Replaced blanks with 'nd';
- Replaced commas with semi-colons in the comments column.


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Related Publications

Peterson, S. H., Lance, M. M., Jeffries, S. J., & Acevedo-Gutiérrez, A. (2012). Long Distance Movements and Disjunct Spatial Use of Harbor Seals (Phoca vitulina) in the Inland Waters of the Pacific Northwest. PLoS ONE, 7(6), e39046. doi:10.1371/journal.pone.0039046
General
Thomas, A., Lance, M., Jeffries, S., Miner, B., & Acevedo-Gutiérrez, A. (2011). Harbor seal foraging response to a seasonal resource pulse, spawning Pacific herring. Marine Ecology Progress Series, 441, 225–239. doi:10.3354/meps09370
Methods
Ward, E. J., Levin, P. S., Lance, M. M., Jeffries, S. J., & Acevedo-Gutiérrez, A. (2011). Integrating diet and movement data to identify hot spots of predation risk and areas of conservation concern for endangered species. Conservation Letters, 5(1), 37–47. doi:10.1111/j.1755-263x.2011.00210.x https://doi.org/10.1111/j.1755-263X.2011.00210.x
Methods

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Parameters

ParameterDescriptionUnits
seal_idUnique seal identification. unitless
seasonSeason: spring, winter, or fall. text
dateDate of capture. format: mm/dd/YYYY unitless
month2-digit month when captured. format: mm (01 to 12) unitless
day2-digit day of month when captured. format: dd (01 to 31) unitless
yearYear of capture. format: YYYY unitless
regionName of the geographic region. text
siteName of the site where captured. text
ageA or AD = adult; SAD = small adult. text
weightWeight of the animal, in kilograms. kg
lengthLength of the animal, in centimeters. cm
pelageDescription of the animal's pelage (coat). text
pregnantYes/no indicator of whether or not the animal was pregnant. Y / N
lactatingYes/no indicator of whether or not the animal was lactating. Y / N
moltYes/no indicator of whether or not the animal was molting. Y / N
bloodYes/no indicator of whether or not blood was drawn. Y / N
biopsyYes/no indicator of whether or not a sample was taken for biopsy. Y / N
instModel of the TDR (time-depth recorder) attached to the animal. unitless
serial_numinst serial number. unitless
inst2Model of the tracking device attached to animal. unitless
serial_num2inst2 serial number. unitless
pttnoPTT tag number. unitless
inst3Model of 3rd instrument associated with the animal. unitless
serial_num3inst3 serial number. unitless
commentFree-text comments. text
sexSex; M = male; F = female. M or F

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Deployments

Seal_Captures

Website
Platform
shoreside San_Juan_Islands
Start Date
2007-04-04
End Date
2009-08-03
Description
Locations of seal captures and tagging for the project 'Responses of Seals and Sea Lions to Increased Rockfish Density' (PI: Alejandro Acevedo-Gutiérrez) In 2007 - 2008, seals were captured in Padilla Bay (approx. 48.5165, -122.5168), Bird/Belle Rocks (approx. 48.4860, -122.7602), and Protection Island (approx. 48.1278, -122.9306). In 2009, seals were captured on Protection Island . References:Thomas, AC; Lance, MM; Jeffries, SJ; Miner, BG; Acevedo-Gutierrez, A. 2011. Harbor seal foraging response to a seasonal resource pulse, spawning Pacific herring. Marine Ecology-Progress Series, v.441. p. 225. DOI: 10.3354/meps09370Ward, EJ; Levin, PS; Lance, MM; Jeffries, SJ; Acevedo-Gutierrez, A. 2012. Integrating diet and movement data to identify hot spots of predation risk and areas of conservation concern for endangered species. Conservation Letters, v.5, p. 37. DOI: 10.1111/j.1755-263X.2011.00210.x


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Project Information

Responses of Seals and Sea Lions to Increased Rockfish Density (Seal_response_to_prey)


Coverage: Salish Sea, USA and Canada


From NSF proposal:
This project is a collaborative study of the responses of harbor seals and other mammalian predators to changes in prey density in Puget Sound. The general study approach will involve multi-year field estimates to observe the responses of predators to rockfish density in protected areas, candidate marine reserves, and unprotected sites.

The collaborating investigators will estimate 1) rockfish density using visual and mark and recapture techniques; 2) predator abundance using aerials surveys and dedicated land observations; and 3) predator food consumption using scat to describe diet, tagging of harbor seals to describe individual foraging sites, and population-based and individual bioenergetics models to describe consumption of rockfish. The investigators will also take into account confounding factors that might explain predator behavior, such as environmental variables and alternative prey, by creating a GIS database from available information from the area. The different field observations and database estimates are explicitly linked through a common hypothesis and coordinated methodologies, and their results will be integrated into a model describing the impact of predation on rockfish populations. The responses of top predators to changes in prey density and their impact on fish populations of interest are unknown. This study will evaluate the effectiveness of MPAs as fish refugia, offer a framework for the management and conservation of marine resources, and provide an exciting opportunity for students to participate in ecological and conservation research.

Hypotheses:
1) Harbor seals and other pinniped species show aggregative responses to changes in prey density. Hence, their abundance will increase with fish density.
2) Harbor seals and other pinniped species show Type 2 or 3 functional responses to changes in prey density. Thus, their consumption rate of a particular prey type follows an asymptotic or sigmoidal curve relative to the prey’s density, respectively.
3) Predation by harbor seals and other pinniped species is sufficiently intense that it impedes recovery of depleted fish populations.

Objectives:
1) Quantify the number of harbor seals and other pinniped species in relation to rockfish density and other environmental (confounding) factors.
2) Estimate the consumption rate of harbor seals and other pinniped species in relation to rockfish density and other prey species.
3) Correlatively estimate the influence of predation by harbor seals and other pinniped species on survivorship and population size of rockfish.

Publications resulting from this NSF award:
Bjorland, R. H., Pearson, S. F, Jeffries, S. J, Lance, M. M., Acevedo- Gutiérrez, A. & Ward, E. J. 2015. Stable isotope mixing models elucidate sex and size effects on the diet of a generalist marine predator. Marine Ecology Progress Series 526: 213-225. DOI: 10.3354/meps11230
Bromaghin, J. F., Lance, M. M., Elliott, E. W., Jeffries, S. J., Acevedo-Gutierrez, A. & Kennish, J. M. 2013. New insights into the diets of harbor seals in the Salish Sea of western North America revealed by quantitative fatty acid signature analysis. Fishery Bulletin 111: 13-26. DOI: 10.7755/FB.111.1.2
Buzzell, B.1, Lance, M. & Acevedo-Gutiérrez, A. 2014. Spatial and temporal variation in river otter (Lontra canadensis) diet and predation on rockfish (Genus Sebastes) in the San Juan Islands, Washington. Aquatic Mammals 40: 150- 161. DOI: 10.1578/AM.40.2.2014.150
Howard, S., Lance, M., Jeffries, S. & Acevedo-Gutierrez, A. 2013. Fish consumption by harbor seals (Phoca vitulina) in the San Juan Islands, WA. Fishery Bulletin 111: 27-41. DOI: 10.7755/FB.111.1.3
Lance, M. M., Chang, W.-Y., Jeffries, S. J., Pearson, S. F. & Acevedo-Gutierrez, A. 2012. Harbor seal diet in northern Puget Sound: implications for the recovery of depressed fish stocks. Marine Ecology Progress Series 464:257-271. DOI:10.3354/meps09880
Luxa, K. & Acevedo-Gutierrez, A. 2013. Food habits of harbor seals (Phoca vitulina) in two estuaries in the central Salish Sea. Aquatic Mammals 39: 10- 22. DOI: 10.1578/AM.39.1.2013.10
Peterson, S., Lance, M. M., Jeffries, S. J. & Acevedo-Gutierrez, A. 2012. Long distance movements and disjunct spatial use of harbor seals (Phoca vitulina) in the inland waters of the Pacific Northwest. PLoS ONE 7: e39046. DOI: 10.1371/journal.pone.0039046
Thomas, AC; Lance, MM; Jeffries, SJ; Miner, BG; Acevedo-Gutierrez, A. 2011. Harbor seal foraging response to a seasonal resource pulse, spawning Pacific herring. Marine Ecology-Progress Series, v.441. p. 225. DOI: 10.3354/meps09370
Ward, EJ; Levin, PS; Lance, MM; Jeffries, SJ; Acevedo-Gutierrez, A. 2012. Integrating diet and movement data to identify hot spots of predation risk and areas of conservation concern for endangered species. Conservation Letters, v.5, p. 37. DOI: 10.1111/j.1755-263X.2011.00210.x
Wilson, K.2, Lance, M., Jeffries, S. & Acevedo-Gutiérrez, A. 2014. Fine-scale variability in harbor seal foraging behavior. PLoS ONE 9: e92838. DOI: 10.1371/journal.pone.0092838.



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Funding

Funding SourceAward
NSF Division of Ocean Sciences (NSF OCE)

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