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Consequences of fish predation, migration, and juvenile ontogeny on zooplankton spring dynamics

Hansson, Lars-Anders LU ; Nicolle, Alice LU ; Brodersen, Jakob LU ; Romare, Pia LU ; Nilsson, Anders LU ; Brönmark, Christer LU and Skov, Christian LU (2007) In Limnology and Oceanography 52(2). p.696-706
Abstract
In order to disentangle if and when resource supply and adult and young-of-the-year (0+) fish predation affect zooplankton dynamics during spring, we monitored zooplankton during three consecutive years in a lake in southern Sweden. We also experimentally assessed 0+ fish predation rates and estimated changes in predation rates of adult fish on zooplankton. Decline in abundances of large-sized zooplankters in early spring was not caused by 0+ fish predation. Instead, this decline was most likely a combined result of size-selective predation from adult fish (stationary in the lake and from those returning from surrounding streams) and competition for diminishing algal food resources. On the other hand, the decline in medium-sized... (More)
In order to disentangle if and when resource supply and adult and young-of-the-year (0+) fish predation affect zooplankton dynamics during spring, we monitored zooplankton during three consecutive years in a lake in southern Sweden. We also experimentally assessed 0+ fish predation rates and estimated changes in predation rates of adult fish on zooplankton. Decline in abundances of large-sized zooplankters in early spring was not caused by 0+ fish predation. Instead, this decline was most likely a combined result of size-selective predation from adult fish (stationary in the lake and from those returning from surrounding streams) and competition for diminishing algal food resources. On the other hand, the decline in medium-sized zooplankton in the lake during spring was strongly affected by 0+ fish. Hence, during spring, zooplankton are facing predation both from adult fish selecting large prey and from 0+ fish, which start feeding on small-sized prey and eventually switch to larger. Neither predation by different ontogenetic stages of fish (adult and 0+) nor resource supply shape the zooplankton spring dynamics, but rather they affect the timing and strength of these events. 0+ cyprinids tend to have stronger effect on zooplankton dynamics than other taxa of 0+ fish. A combination of predation from adult and 0+ fish during spring is the main mechanism behind the crash of the zooplankton community, which in many lakes leads to the termination of the clear-water phase. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Limnology and Oceanography
volume
52
issue
2
pages
696 - 706
publisher
ASLO
external identifiers
  • scopus:34250863762
ISSN
1939-5590
language
English
LU publication?
yes
id
90910e79-9756-41e6-b753-b3237667975b (old id 168561)
alternative location
http://www.aslo.org/lo/toc/vol_52/issue_2/0696.pdf
date added to LUP
2007-06-28 13:47:32
date last changed
2017-09-17 07:03:35
@article{90910e79-9756-41e6-b753-b3237667975b,
  abstract     = {In order to disentangle if and when resource supply and adult and young-of-the-year (0+) fish predation affect zooplankton dynamics during spring, we monitored zooplankton during three consecutive years in a lake in southern Sweden. We also experimentally assessed 0+ fish predation rates and estimated changes in predation rates of adult fish on zooplankton. Decline in abundances of large-sized zooplankters in early spring was not caused by 0+ fish predation. Instead, this decline was most likely a combined result of size-selective predation from adult fish (stationary in the lake and from those returning from surrounding streams) and competition for diminishing algal food resources. On the other hand, the decline in medium-sized zooplankton in the lake during spring was strongly affected by 0+ fish. Hence, during spring, zooplankton are facing predation both from adult fish selecting large prey and from 0+ fish, which start feeding on small-sized prey and eventually switch to larger. Neither predation by different ontogenetic stages of fish (adult and 0+) nor resource supply shape the zooplankton spring dynamics, but rather they affect the timing and strength of these events. 0+ cyprinids tend to have stronger effect on zooplankton dynamics than other taxa of 0+ fish. A combination of predation from adult and 0+ fish during spring is the main mechanism behind the crash of the zooplankton community, which in many lakes leads to the termination of the clear-water phase.},
  author       = {Hansson, Lars-Anders and Nicolle, Alice and Brodersen, Jakob and Romare, Pia and Nilsson, Anders and Brönmark, Christer and Skov, Christian},
  issn         = {1939-5590},
  language     = {eng},
  number       = {2},
  pages        = {696--706},
  publisher    = {ASLO},
  series       = {Limnology and Oceanography},
  title        = {Consequences of fish predation, migration, and juvenile ontogeny on zooplankton spring dynamics},
  volume       = {52},
  year         = {2007},
}