Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 545150
Title Understanding ontogenetic and temporal variability of Eastern Baltic cod diet using a multispecies model and stomach data
Author(s) Kulatska, Nataliia; Neuenfeldt, Stefan; Beier, Ulrika; Elvarsson, Bjarki Þór; Wennhage, Håkan; Stefansson, Gunnar; Bartolino, Valerio
Source Fisheries Research 211 (2019). - ISSN 0165-7836 - p. 338 - 349.
Department(s) Onderzoeksformatie
Publication type Refereed Article in a scientific journal
Publication year 2019
Keyword(s) Diet composition - Length selection - Multi-species model - Predator-prey interactions

Size of predator and prey determines, to a large extent, predator-prey interactions in aquatic systems. Understanding the relationship between predator and prey size in the individual predator's food selection process is a cornerstone of ecological modelling. Stomach content data are used to inform such models, as they provide prey species specific information about the predator diet in the wild. These data are strongly relevant as direct observations of species trophic interactions, but they have limitations, and are costly. Our objective was to develop and test a model which is able to predict changes in the Baltic cod diet by reconstructing the dynamics of cod and its prey, herring and sprat, populations, their length distributions, and parametrizing trophic interactions between them. We analysed time-series of cod stomach data and built an age-length structured multispecies model using Gadget. Both observed and predicted diets of smaller (juvenile) cod consisted mainly of benthos, while larger cod fed mostly on fishes (herring and sprat). Our model could predict the main patterns in species and length composition of cod diet. We also identified important knowledge gaps, especially on benthos dynamics and processes affecting prey availability and predator preference.

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