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Prey-type-dependent foraging of young-of-the-year fish in turbid and humic environments

Jönsson, Mikael LU ; Ranåker, Lynn LU ; Nilsson Plymoth, Anders LU and Brönmark, Christer LU (2012) In Ecology of Freshwater Fish 21(3). p.461-468
Abstract
Fish, which are generally visual foragers, experiences reduced reaction distance in visually degraded environments, which has consequences for encounter rates with prey. Small prey is detected at shorter distances than larger prey, and piscivores are therefore predicted to be more strongly affected by visual degradation. In experiments, roach (Rutilus rutilus) were fed two plankton prey types and pike (Esox lucius) were fed Daphnia and larval roach, in clear water, algal turbid water and water coloured brown by dissolved organic matter (DOM). Planktivorous foraging in roach was not affected by visual degradation, while pike foraging on both Daphnia and larval roach was. Pike showed increased reaction distance to Daphnia in visually... (More)
Fish, which are generally visual foragers, experiences reduced reaction distance in visually degraded environments, which has consequences for encounter rates with prey. Small prey is detected at shorter distances than larger prey, and piscivores are therefore predicted to be more strongly affected by visual degradation. In experiments, roach (Rutilus rutilus) were fed two plankton prey types and pike (Esox lucius) were fed Daphnia and larval roach, in clear water, algal turbid water and water coloured brown by dissolved organic matter (DOM). Planktivorous foraging in roach was not affected by visual degradation, while pike foraging on both Daphnia and larval roach was. Pike showed increased reaction distance to Daphnia in visually degraded water, while it was severely reduced with roach as prey even if the visual range was not reduced below pike reaction distances in clear water. Pike foraging on Daphnia was not affected, but when foraging on roach, the reduced search efficiency was counteracted by increased attack rates. However, there was no increase in movement and no difference between turbid and DOM treatments. Effects on piscivores will likely become more pronounced at later life stages as prey size and the reliance on long-distance detection increases at the same time as changing climatic conditions may further deteriorate the visual conditions in future. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
turbidity, humic water, foraging, prey size, juvenile fish
in
Ecology of Freshwater Fish
volume
21
issue
3
pages
461 - 468
publisher
Wiley-Blackwell
external identifiers
  • wos:000304818800014
  • scopus:84861954075
ISSN
0906-6691
DOI
10.1111/j.1600-0633.2012.00565.x
project
BECC
language
English
LU publication?
yes
id
3d6a1fac-373e-45bd-af50-c1e2bbe0df6c (old id 2895865)
date added to LUP
2012-07-25 17:36:29
date last changed
2017-09-24 04:15:36
@article{3d6a1fac-373e-45bd-af50-c1e2bbe0df6c,
  abstract     = {Fish, which are generally visual foragers, experiences reduced reaction distance in visually degraded environments, which has consequences for encounter rates with prey. Small prey is detected at shorter distances than larger prey, and piscivores are therefore predicted to be more strongly affected by visual degradation. In experiments, roach (Rutilus rutilus) were fed two plankton prey types and pike (Esox lucius) were fed Daphnia and larval roach, in clear water, algal turbid water and water coloured brown by dissolved organic matter (DOM). Planktivorous foraging in roach was not affected by visual degradation, while pike foraging on both Daphnia and larval roach was. Pike showed increased reaction distance to Daphnia in visually degraded water, while it was severely reduced with roach as prey even if the visual range was not reduced below pike reaction distances in clear water. Pike foraging on Daphnia was not affected, but when foraging on roach, the reduced search efficiency was counteracted by increased attack rates. However, there was no increase in movement and no difference between turbid and DOM treatments. Effects on piscivores will likely become more pronounced at later life stages as prey size and the reliance on long-distance detection increases at the same time as changing climatic conditions may further deteriorate the visual conditions in future.},
  author       = {Jönsson, Mikael and Ranåker, Lynn and Nilsson Plymoth, Anders and Brönmark, Christer},
  issn         = {0906-6691},
  keyword      = {turbidity,humic water,foraging,prey size,juvenile fish},
  language     = {eng},
  number       = {3},
  pages        = {461--468},
  publisher    = {Wiley-Blackwell},
  series       = {Ecology of Freshwater Fish},
  title        = {Prey-type-dependent foraging of young-of-the-year fish in turbid and humic environments},
  url          = {http://dx.doi.org/10.1111/j.1600-0633.2012.00565.x},
  volume       = {21},
  year         = {2012},
}