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Predator-prey size relationships of cod in a low diversity marine system

Niiranen, Susa and Orio, Alessandro and Bartolino, Valerio and Bergström, Ulf and Kallasvuo, Meri and Neuenfeldt, Stefan and Ustups, Didzis and Casini, Michele (2019). Predator-prey size relationships of cod in a low diversity marine system. Marine Ecology Progress Series. 627 , 201-206
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Abstract

How predators select their prey largely defines ecosystem trophic structure, function and dynamics. In aquatic systems, organism body size is an important trait explaining predator− prey interactions. Here, we used a unique Atlantic cod Gadus morhua stomach content dataset with diet information from over 100 000 individuals collected from the Baltic Sea in 1963−2014, to explore prey size distribution and predator−prey mass ratios in the diet of Eastern Baltic cod. Maximum and average prey sizes increased with predator size, as for cod in other systems. However, the prey size spectra found in Eastern Baltic cod stomachs reflect the low species diversity in the Baltic Sea. In general, Eastern Baltic cod feed on smaller prey in relation to their body size than other cod populations. Due to the truncated prey size distribution in the Baltic Sea, cod cannibalism functions as a compensatory mechanism that allows Baltic cod to reach their prey size potential. On the other hand, small- and intermediate-sized cod prey mainly on a few invertebrate prey species, potentially making them vulnerable to changes in these prey populations. Our results encourage further studies disentangling the relative effects of prey preference and prey availability on cod trophodynamics in species-poor systems such as the Baltic Sea.

Authors/Creators:Niiranen, Susa and Orio, Alessandro and Bartolino, Valerio and Bergström, Ulf and Kallasvuo, Meri and Neuenfeldt, Stefan and Ustups, Didzis and Casini, Michele
Title:Predator-prey size relationships of cod in a low diversity marine system
Year of publishing :2019
Volume:627
Page range:201-206
Number of Pages:6
Publisher:Inter-Research
Associated Programs and Other Stakeholders:SLU - Environmental assessment > Programme Biodiversity
SLU - Environmental assessment > Programme Coastal and sea areas
ISSN:0171-8630
Language:English
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Fish and Aquacultural Science
Keywords:Diet, Body size, Predator−prey mass ratio, Gadus morhua, Baltic Sea, Stomach content data
URN:NBN:urn:nbn:se:slu:epsilon-p-103277
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-103277
Additional ID:
Type of IDID
DOI10.3354/meps13098
ID Code:16536
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Department of Aquatic Resources
Deposited By: SLUpub Connector
Deposited On:06 Feb 2020 09:20
Metadata Last Modified:06 Feb 2020 09:20

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