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Sources of variation in stomach contents of predators of Atlantic herring in the Northwest Atlantic during 1973–2014
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2018
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Source: ICES Journal of Marine Science, 75(4), 1439-1450
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Journal Title:ICES Journal of Marine Science
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Description: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.
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Source:ICES Journal of Marine Science, 75(4), 1439-1450
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ISSN:1054-3139;1095-9289;
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Rights Information:CC0 Public Domain
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Rights Statement:This work is written by a US Government employee and is in the public domain in the US.
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