Sources of variation in stomach contents of predators of Atlantic herring in the Northwest Atlantic during 1973–2014
Abstract Spatial and temporal variation in stomach-contents data is often unquantified or combined in such a way (e.g. averaged among years) that true signal in diets may be lost. Using a delta approach, this paper fits generalized additive mixed models (GAMMs) to the amount of Atlantic herring (Clu...
Published in: | ICES Journal of Marine Science |
---|---|
Main Author: | |
Other Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Oxford University Press (OUP)
2018
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1093/icesjms/fsy013 http://academic.oup.com/icesjms/article-pdf/75/4/1439/31237007/fsy013.pdf |
id |
croxfordunivpr:10.1093/icesjms/fsy013 |
---|---|
record_format |
openpolar |
spelling |
croxfordunivpr:10.1093/icesjms/fsy013 2024-09-09T19:59:55+00:00 Sources of variation in stomach contents of predators of Atlantic herring in the Northwest Atlantic during 1973–2014 Deroba, Jonathan J Anderson, Emory National Marine Fisheries Service Northeast Fisheries Science Center 2018 http://dx.doi.org/10.1093/icesjms/fsy013 http://academic.oup.com/icesjms/article-pdf/75/4/1439/31237007/fsy013.pdf en eng Oxford University Press (OUP) ICES Journal of Marine Science volume 75, issue 4, page 1439-1450 ISSN 1054-3139 1095-9289 journal-article 2018 croxfordunivpr https://doi.org/10.1093/icesjms/fsy013 2024-08-27T04:16:24Z Abstract Spatial and temporal variation in stomach-contents data is often unquantified or combined in such a way (e.g. averaged among years) that true signal in diets may be lost. Using a delta approach, this paper fits generalized additive mixed models (GAMMs) to the amount of Atlantic herring (Clupea harengus) identified in predator stomachs using only data from stomachs in which herring occurred, and to the probability that a stomach contained herring. Both the amount of herring in stomachs and the probability of a stomach containing herring varied seasonally, spatially, and among years. Of the random effects in each GAMM, the effect of predator species had the largest variance. An index of herring abundance derived from the stomach-contents data was generally consistent with recent herring stock assessments. The temporal and spatial variation in the stomach-contents data suggested that the effect of averaging or combining stomach-contents data among years, seasons, or areas may lead to falsely precise or biased estimates from multispecies assessments or in estimates of consumption, and may restrain the relevance of static foodweb models. Article in Journal/Newspaper Northwest Atlantic Oxford University Press ICES Journal of Marine Science 75 4 1439 1450 |
institution |
Open Polar |
collection |
Oxford University Press |
op_collection_id |
croxfordunivpr |
language |
English |
description |
Abstract Spatial and temporal variation in stomach-contents data is often unquantified or combined in such a way (e.g. averaged among years) that true signal in diets may be lost. Using a delta approach, this paper fits generalized additive mixed models (GAMMs) to the amount of Atlantic herring (Clupea harengus) identified in predator stomachs using only data from stomachs in which herring occurred, and to the probability that a stomach contained herring. Both the amount of herring in stomachs and the probability of a stomach containing herring varied seasonally, spatially, and among years. Of the random effects in each GAMM, the effect of predator species had the largest variance. An index of herring abundance derived from the stomach-contents data was generally consistent with recent herring stock assessments. The temporal and spatial variation in the stomach-contents data suggested that the effect of averaging or combining stomach-contents data among years, seasons, or areas may lead to falsely precise or biased estimates from multispecies assessments or in estimates of consumption, and may restrain the relevance of static foodweb models. |
author2 |
Anderson, Emory National Marine Fisheries Service Northeast Fisheries Science Center |
format |
Article in Journal/Newspaper |
author |
Deroba, Jonathan J |
spellingShingle |
Deroba, Jonathan J Sources of variation in stomach contents of predators of Atlantic herring in the Northwest Atlantic during 1973–2014 |
author_facet |
Deroba, Jonathan J |
author_sort |
Deroba, Jonathan J |
title |
Sources of variation in stomach contents of predators of Atlantic herring in the Northwest Atlantic during 1973–2014 |
title_short |
Sources of variation in stomach contents of predators of Atlantic herring in the Northwest Atlantic during 1973–2014 |
title_full |
Sources of variation in stomach contents of predators of Atlantic herring in the Northwest Atlantic during 1973–2014 |
title_fullStr |
Sources of variation in stomach contents of predators of Atlantic herring in the Northwest Atlantic during 1973–2014 |
title_full_unstemmed |
Sources of variation in stomach contents of predators of Atlantic herring in the Northwest Atlantic during 1973–2014 |
title_sort |
sources of variation in stomach contents of predators of atlantic herring in the northwest atlantic during 1973–2014 |
publisher |
Oxford University Press (OUP) |
publishDate |
2018 |
url |
http://dx.doi.org/10.1093/icesjms/fsy013 http://academic.oup.com/icesjms/article-pdf/75/4/1439/31237007/fsy013.pdf |
genre |
Northwest Atlantic |
genre_facet |
Northwest Atlantic |
op_source |
ICES Journal of Marine Science volume 75, issue 4, page 1439-1450 ISSN 1054-3139 1095-9289 |
op_doi |
https://doi.org/10.1093/icesjms/fsy013 |
container_title |
ICES Journal of Marine Science |
container_volume |
75 |
container_issue |
4 |
container_start_page |
1439 |
op_container_end_page |
1450 |
_version_ |
1809931015717650432 |