Data from: Large‐scale molecular diet analysis in a generalist marine mammal reveals male preference for prey of conservation concern
Sex‐specific diet information is important in the determination of predator impacts on prey populations. Unfortunately, the diet of males and females can be difficult to describe, particularly when they are marine predators. We combined two molecular techniques to describe haul‐out use and prey pref...
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ftdryad:oai:v1.datadryad.org:10255/dryad.186920 2023-05-15T16:33:10+02:00 Data from: Large‐scale molecular diet analysis in a generalist marine mammal reveals male preference for prey of conservation concern Schwarz, Dietmar Spitzer, Sara M. Thomas, Austen C. Kohnert, Christa M. Keates, Theresa R. Acevedo-Gutiérrez, Alejandro Salish Sea Holocene 2018-09-17T11:44:28Z http://hdl.handle.net/10255/dryad.186920 https://doi.org/10.5061/dryad.g23j32s unknown doi:10.5061/dryad.g23j32s/1 doi:10.1002/ece3.4474 doi:10.5061/dryad.g23j32s Schwarz D, Spitzer SM, Thomas AC, Kohnert CM, Keates TR, Acevedo-Gutiérrez A (2018) Large‐scale molecular diet analysis in a generalist marine mammal reveals male preference for prey of conservation concern. Ecology and Evolution 8(19): 9889-9905. http://hdl.handle.net/10255/dryad.186920 Diet Analysis Predator Prey Interactions Marine Mammals Sex Identification DNA Metabarcoding Article 2018 ftdryad https://doi.org/10.5061/dryad.g23j32s https://doi.org/10.5061/dryad.g23j32s/1 https://doi.org/10.1002/ece3.4474 2020-01-01T16:12:57Z Sex‐specific diet information is important in the determination of predator impacts on prey populations. Unfortunately, the diet of males and females can be difficult to describe, particularly when they are marine predators. We combined two molecular techniques to describe haul‐out use and prey preferences of male and female harbor seals (Phoca vitulina) from Comox and Cowichan Bay (Canada) during 2012–2013. DNA metabarcoding quantified the diet proportions comprised of prey species in harbor seal scat, and qPCR determined the sex of the individual that deposited each scat. Using 287 female and 260 male samples, we compared the monthly sex ratio with GLMs and analyzed prey consumption relative to sex, season, site, and year with PERMANOVA. The sex ratio between monthly samples differed widely in both years (range = 12%–79% males) and showed different patterns at each haul‐out site. Male and female diet differed across both years and sites: Females consumed a high proportion of demersal fish species while males consumed more salmonid species. Diet composition was related to both sex and season (PERMANOVA: R2 = 27%, p < 0.001; R2 = 24%, p < 0.001, respectively) and their interaction (PERMANOVA: R2 = 11%, p < 0.001). Diet differences between males and females were consistent across site and year, suggesting fundamental foraging differences, including that males may have a larger impact on salmonids than females. Our novel combination of techniques allowed for both prey taxonomic and spatiotemporal resolution unprecedented in marine predators. Article in Journal/Newspaper harbor seal Phoca vitulina Dryad Digital Repository (Duke University) Canada |
institution |
Open Polar |
collection |
Dryad Digital Repository (Duke University) |
op_collection_id |
ftdryad |
language |
unknown |
topic |
Diet Analysis Predator Prey Interactions Marine Mammals Sex Identification DNA Metabarcoding |
spellingShingle |
Diet Analysis Predator Prey Interactions Marine Mammals Sex Identification DNA Metabarcoding Schwarz, Dietmar Spitzer, Sara M. Thomas, Austen C. Kohnert, Christa M. Keates, Theresa R. Acevedo-Gutiérrez, Alejandro Data from: Large‐scale molecular diet analysis in a generalist marine mammal reveals male preference for prey of conservation concern |
topic_facet |
Diet Analysis Predator Prey Interactions Marine Mammals Sex Identification DNA Metabarcoding |
description |
Sex‐specific diet information is important in the determination of predator impacts on prey populations. Unfortunately, the diet of males and females can be difficult to describe, particularly when they are marine predators. We combined two molecular techniques to describe haul‐out use and prey preferences of male and female harbor seals (Phoca vitulina) from Comox and Cowichan Bay (Canada) during 2012–2013. DNA metabarcoding quantified the diet proportions comprised of prey species in harbor seal scat, and qPCR determined the sex of the individual that deposited each scat. Using 287 female and 260 male samples, we compared the monthly sex ratio with GLMs and analyzed prey consumption relative to sex, season, site, and year with PERMANOVA. The sex ratio between monthly samples differed widely in both years (range = 12%–79% males) and showed different patterns at each haul‐out site. Male and female diet differed across both years and sites: Females consumed a high proportion of demersal fish species while males consumed more salmonid species. Diet composition was related to both sex and season (PERMANOVA: R2 = 27%, p < 0.001; R2 = 24%, p < 0.001, respectively) and their interaction (PERMANOVA: R2 = 11%, p < 0.001). Diet differences between males and females were consistent across site and year, suggesting fundamental foraging differences, including that males may have a larger impact on salmonids than females. Our novel combination of techniques allowed for both prey taxonomic and spatiotemporal resolution unprecedented in marine predators. |
format |
Article in Journal/Newspaper |
author |
Schwarz, Dietmar Spitzer, Sara M. Thomas, Austen C. Kohnert, Christa M. Keates, Theresa R. Acevedo-Gutiérrez, Alejandro |
author_facet |
Schwarz, Dietmar Spitzer, Sara M. Thomas, Austen C. Kohnert, Christa M. Keates, Theresa R. Acevedo-Gutiérrez, Alejandro |
author_sort |
Schwarz, Dietmar |
title |
Data from: Large‐scale molecular diet analysis in a generalist marine mammal reveals male preference for prey of conservation concern |
title_short |
Data from: Large‐scale molecular diet analysis in a generalist marine mammal reveals male preference for prey of conservation concern |
title_full |
Data from: Large‐scale molecular diet analysis in a generalist marine mammal reveals male preference for prey of conservation concern |
title_fullStr |
Data from: Large‐scale molecular diet analysis in a generalist marine mammal reveals male preference for prey of conservation concern |
title_full_unstemmed |
Data from: Large‐scale molecular diet analysis in a generalist marine mammal reveals male preference for prey of conservation concern |
title_sort |
data from: large‐scale molecular diet analysis in a generalist marine mammal reveals male preference for prey of conservation concern |
publishDate |
2018 |
url |
http://hdl.handle.net/10255/dryad.186920 https://doi.org/10.5061/dryad.g23j32s |
op_coverage |
Salish Sea Holocene |
geographic |
Canada |
geographic_facet |
Canada |
genre |
harbor seal Phoca vitulina |
genre_facet |
harbor seal Phoca vitulina |
op_relation |
doi:10.5061/dryad.g23j32s/1 doi:10.1002/ece3.4474 doi:10.5061/dryad.g23j32s Schwarz D, Spitzer SM, Thomas AC, Kohnert CM, Keates TR, Acevedo-Gutiérrez A (2018) Large‐scale molecular diet analysis in a generalist marine mammal reveals male preference for prey of conservation concern. Ecology and Evolution 8(19): 9889-9905. http://hdl.handle.net/10255/dryad.186920 |
op_doi |
https://doi.org/10.5061/dryad.g23j32s https://doi.org/10.5061/dryad.g23j32s/1 https://doi.org/10.1002/ece3.4474 |
_version_ |
1766022872424251392 |