Prey-type-dependent foraging of young-of-the-year fish in turbid and humic environments
(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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/2895865
- author
- Jönsson, Mikael LU ; Ranåker, Lynn LU ; Nilsson, P. Anders LU and Brönmark, Christer LU
- organization
- publishing date
- 2012
- 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
- language
- English
- LU publication?
- yes
- id
- 3d6a1fac-373e-45bd-af50-c1e2bbe0df6c (old id 2895865)
- date added to LUP
- 2016-04-01 15:03:28
- date last changed
- 2024-01-10 12:23:38
@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, P. Anders and Brönmark, Christer}}, issn = {{0906-6691}}, keywords = {{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}}, doi = {{10.1111/j.1600-0633.2012.00565.x}}, volume = {{21}}, year = {{2012}}, }