A model for estimating meal frequency and meal size from stomach data with an application to Atlantic cod ( Gadus morhua ) feeding on capelin ( Mallotus villosus )
The feeding of a predator on prey that occurs in schools is modelled as a stochastic process involving two random variables: (i) the number of schools that the predator finds per unit time and (ii) the number of prey items captured in each encounter. The number of encounters is governed by a Poisson...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Canadian Science Publishing
1997
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Online Access: | http://dx.doi.org/10.1139/f96-341 http://www.nrcresearchpress.com/doi/pdf/10.1139/f96-341 |
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crcansciencepubl:10.1139/f96-341 2023-12-17T10:27:02+01:00 A model for estimating meal frequency and meal size from stomach data with an application to Atlantic cod ( Gadus morhua ) feeding on capelin ( Mallotus villosus ) Magnússon, K G Aspelund, T 1997 http://dx.doi.org/10.1139/f96-341 http://www.nrcresearchpress.com/doi/pdf/10.1139/f96-341 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 54, issue 4, page 876-889 ISSN 0706-652X 1205-7533 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 1997 crcansciencepubl https://doi.org/10.1139/f96-341 2023-11-19T13:39:06Z The feeding of a predator on prey that occurs in schools is modelled as a stochastic process involving two random variables: (i) the number of schools that the predator finds per unit time and (ii) the number of prey items captured in each encounter. The number of encounters is governed by a Poisson process and the number of prey items can be either a Poisson random variable or more generally a negative binomial. The principal parameters in the model can be interpreted as the average meal frequency and the average meal size. This model is applied to Atlantic cod (Gadus morhua) feeding on capelin (Mallotus villosus). Cod stomachs from six length-groups were sampled off eastern Iceland and the number of capelin in individual stomachs recorded. The parameters in the stochastic feeding model are estimated by the method of maximum likelihood using the observed frequency distribution of capelin numbers in cod stomachs. The data fit the model well where the meal size is modelled by a negative binomial distribution, but less successfully where the meal size has a Poisson distribution. Finally, using the estimates of average meal frequency and average meal size the average and the standard deviation of consumption rate are calculated. Article in Journal/Newspaper atlantic cod Gadus morhua Iceland Canadian Science Publishing (via Crossref) Canadian Journal of Fisheries and Aquatic Sciences 54 4 876 889 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Aquatic Science Ecology, Evolution, Behavior and Systematics Magnússon, K G Aspelund, T A model for estimating meal frequency and meal size from stomach data with an application to Atlantic cod ( Gadus morhua ) feeding on capelin ( Mallotus villosus ) |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
The feeding of a predator on prey that occurs in schools is modelled as a stochastic process involving two random variables: (i) the number of schools that the predator finds per unit time and (ii) the number of prey items captured in each encounter. The number of encounters is governed by a Poisson process and the number of prey items can be either a Poisson random variable or more generally a negative binomial. The principal parameters in the model can be interpreted as the average meal frequency and the average meal size. This model is applied to Atlantic cod (Gadus morhua) feeding on capelin (Mallotus villosus). Cod stomachs from six length-groups were sampled off eastern Iceland and the number of capelin in individual stomachs recorded. The parameters in the stochastic feeding model are estimated by the method of maximum likelihood using the observed frequency distribution of capelin numbers in cod stomachs. The data fit the model well where the meal size is modelled by a negative binomial distribution, but less successfully where the meal size has a Poisson distribution. Finally, using the estimates of average meal frequency and average meal size the average and the standard deviation of consumption rate are calculated. |
format |
Article in Journal/Newspaper |
author |
Magnússon, K G Aspelund, T |
author_facet |
Magnússon, K G Aspelund, T |
author_sort |
Magnússon, K G |
title |
A model for estimating meal frequency and meal size from stomach data with an application to Atlantic cod ( Gadus morhua ) feeding on capelin ( Mallotus villosus ) |
title_short |
A model for estimating meal frequency and meal size from stomach data with an application to Atlantic cod ( Gadus morhua ) feeding on capelin ( Mallotus villosus ) |
title_full |
A model for estimating meal frequency and meal size from stomach data with an application to Atlantic cod ( Gadus morhua ) feeding on capelin ( Mallotus villosus ) |
title_fullStr |
A model for estimating meal frequency and meal size from stomach data with an application to Atlantic cod ( Gadus morhua ) feeding on capelin ( Mallotus villosus ) |
title_full_unstemmed |
A model for estimating meal frequency and meal size from stomach data with an application to Atlantic cod ( Gadus morhua ) feeding on capelin ( Mallotus villosus ) |
title_sort |
model for estimating meal frequency and meal size from stomach data with an application to atlantic cod ( gadus morhua ) feeding on capelin ( mallotus villosus ) |
publisher |
Canadian Science Publishing |
publishDate |
1997 |
url |
http://dx.doi.org/10.1139/f96-341 http://www.nrcresearchpress.com/doi/pdf/10.1139/f96-341 |
genre |
atlantic cod Gadus morhua Iceland |
genre_facet |
atlantic cod Gadus morhua Iceland |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 54, issue 4, page 876-889 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f96-341 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
54 |
container_issue |
4 |
container_start_page |
876 |
op_container_end_page |
889 |
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1785578798747484160 |