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Prey selectivity by juvenile Atlantic cod Gadus morhua in three coastal habitat types

Ljungberg, Peter LU ; Nilsson, Anders LU and Persson, Anders LU (2012) In Marine Ecology - Progress Series 466. p.215-223
Abstract
Coastal habitats are heavily subjected to eutrophication and commercial fisheries, and such alterations can affect organism interaction strengths and potentially influence trophic dynamics. A key species inhabiting coastal environments in temperate waters is the Atlantic cod Gadus morhua, which utilises coastal areas for food and shelter. We used an experimental mechanistic approach to assay prey selectivity by juvenile cod when foraging on grass shrimp Palaemon elegans and brown shrimp Crangon crangon, under light and dark conditions, in 3 of the most abundant habitat types in temperate coastal environments-sand, eelgrass (artificial vegetation mimicking Zostera marina), and bladderwrack Fucus vesiculosus. Using functional response... (More)
Coastal habitats are heavily subjected to eutrophication and commercial fisheries, and such alterations can affect organism interaction strengths and potentially influence trophic dynamics. A key species inhabiting coastal environments in temperate waters is the Atlantic cod Gadus morhua, which utilises coastal areas for food and shelter. We used an experimental mechanistic approach to assay prey selectivity by juvenile cod when foraging on grass shrimp Palaemon elegans and brown shrimp Crangon crangon, under light and dark conditions, in 3 of the most abundant habitat types in temperate coastal environments-sand, eelgrass (artificial vegetation mimicking Zostera marina), and bladderwrack Fucus vesiculosus. Using functional response relationships from single-prey experiments, we calculated the energetically best foraging strategy for cod in the 3 habitats, i.e. feeding selectively on either of the shrimp species or on a combination of both. These predictions were tested in experiments where the cod predator was offered both prey species. Cod selected both prey species in accordance with our predictions in eelgrass and in bladderwrack under light conditions, but a lower than predicted consumption of grass shrimp was found in sand and in bladderwrack under dark conditions. Cod decreasingly selected grass shrimp with increasing habitat complexity, i.e. the highest selectivity was in sand and the lowest selectivity was in bladderwrack. As the 2 shrimp species have different trophic roles, cod selective predation may have effects on lower trophic levels. We provide a quantitative prediction of cod selective predation in habitat types that undergo degradation, and suggest that such predation can influence the trophic consequences from environmental change. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Prey choice, Functional response, Trophic cascade, Seagrass, Macroalgae, Atlantic cod, Gadus morhua, Shrimp
in
Marine Ecology - Progress Series
volume
466
pages
215 - 223
publisher
Inter-Research
external identifiers
  • wos:000309838100018
  • scopus:84867567266
ISSN
1616-1599
DOI
10.3354/meps09932
language
English
LU publication?
yes
id
c384882d-c984-4dc4-ba9c-66e69eb137a1 (old id 3181318)
date added to LUP
2012-12-12 08:27:07
date last changed
2017-09-03 04:18:17
@article{c384882d-c984-4dc4-ba9c-66e69eb137a1,
  abstract     = {Coastal habitats are heavily subjected to eutrophication and commercial fisheries, and such alterations can affect organism interaction strengths and potentially influence trophic dynamics. A key species inhabiting coastal environments in temperate waters is the Atlantic cod Gadus morhua, which utilises coastal areas for food and shelter. We used an experimental mechanistic approach to assay prey selectivity by juvenile cod when foraging on grass shrimp Palaemon elegans and brown shrimp Crangon crangon, under light and dark conditions, in 3 of the most abundant habitat types in temperate coastal environments-sand, eelgrass (artificial vegetation mimicking Zostera marina), and bladderwrack Fucus vesiculosus. Using functional response relationships from single-prey experiments, we calculated the energetically best foraging strategy for cod in the 3 habitats, i.e. feeding selectively on either of the shrimp species or on a combination of both. These predictions were tested in experiments where the cod predator was offered both prey species. Cod selected both prey species in accordance with our predictions in eelgrass and in bladderwrack under light conditions, but a lower than predicted consumption of grass shrimp was found in sand and in bladderwrack under dark conditions. Cod decreasingly selected grass shrimp with increasing habitat complexity, i.e. the highest selectivity was in sand and the lowest selectivity was in bladderwrack. As the 2 shrimp species have different trophic roles, cod selective predation may have effects on lower trophic levels. We provide a quantitative prediction of cod selective predation in habitat types that undergo degradation, and suggest that such predation can influence the trophic consequences from environmental change.},
  author       = {Ljungberg, Peter and Nilsson, Anders and Persson, Anders},
  issn         = {1616-1599},
  keyword      = {Prey choice,Functional response,Trophic cascade,Seagrass,Macroalgae,Atlantic cod,Gadus morhua,Shrimp},
  language     = {eng},
  pages        = {215--223},
  publisher    = {Inter-Research},
  series       = {Marine Ecology - Progress Series},
  title        = {Prey selectivity by juvenile Atlantic cod Gadus morhua in three coastal habitat types},
  url          = {http://dx.doi.org/10.3354/meps09932},
  volume       = {466},
  year         = {2012},
}