Long-term changes in crustacean zooplankton--the effects of a mass removal of Arctic chan, Salvelinus alpinus (L.), from an oligotrophic lake
The long-term effects of the removal of ∼32 metric tons of stunted Arctic charr on the crustacean zooplankton community in the oligotrophic Lake Takvatn, north Norway, were investigated. The removal of charr resulted in a sharp decline in the abundance of this fish in the pelagic zone. The two copep...
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Oxford University Press
1995
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fthighwire:oai:open-archive.highwire.org:plankt:17/9/1819 2023-05-15T14:30:06+02:00 Long-term changes in crustacean zooplankton--the effects of a mass removal of Arctic chan, Salvelinus alpinus (L.), from an oligotrophic lake Dahl-Hansen, Geir A.P. 1995-09-01 00:00:00.0 text/html http://plankt.oxfordjournals.org/cgi/content/short/17/9/1819 https://doi.org/10.1093/plankt/17.9.1819 en eng Oxford University Press http://plankt.oxfordjournals.org/cgi/content/short/17/9/1819 http://dx.doi.org/10.1093/plankt/17.9.1819 Copyright (C) 1995, Oxford University Press ORIGINAL ARTICLES TEXT 1995 fthighwire https://doi.org/10.1093/plankt/17.9.1819 2007-06-25T07:40:13Z The long-term effects of the removal of ∼32 metric tons of stunted Arctic charr on the crustacean zooplankton community in the oligotrophic Lake Takvatn, north Norway, were investigated. The removal of charr resulted in a sharp decline in the abundance of this fish in the pelagic zone. The two copepods, Cyclops scutifer and Eudiaptomus graciloides , and the small cladoceran Bosmina longispina , were the only abundant plankton species in the limnetic zone prior to the stock reduction program. A slight increase in the density, biomass and relative importance of B.longispina, Holopedium gibberum and Daphnia longispina occurred from 1984 to 1989, reaching a maximum in 1989. An increased body length of ovigerous B.longispina was also observed. These changes seemed to coincide with the reduction in abundance of Arctic charr in the limnetic zone, suggesting a regulatory role of the charr. A decline in 1990, and a total collapse in the cladoceran compartment in 1991, occurred simultaneously with observations of high densities of threespine sticklebacks in Takvatn. After a mass die-off of this fish, B.longirostris contributed strongly to the zooplankton community as the only cladoceran in 1992. Along with the re-occurrence of B.longispina and H.gibberwn in 1993, the importance of B.longirostris diminished. The highest total zooplankton biomass ever registered was found this year. Text Arctic charr Arctic North Norway Salvelinus alpinus Zooplankton Copepods HighWire Press (Stanford University) Arctic Norway Journal of Plankton Research 17 9 1819 1833 |
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Open Polar |
collection |
HighWire Press (Stanford University) |
op_collection_id |
fthighwire |
language |
English |
topic |
ORIGINAL ARTICLES |
spellingShingle |
ORIGINAL ARTICLES Dahl-Hansen, Geir A.P. Long-term changes in crustacean zooplankton--the effects of a mass removal of Arctic chan, Salvelinus alpinus (L.), from an oligotrophic lake |
topic_facet |
ORIGINAL ARTICLES |
description |
The long-term effects of the removal of ∼32 metric tons of stunted Arctic charr on the crustacean zooplankton community in the oligotrophic Lake Takvatn, north Norway, were investigated. The removal of charr resulted in a sharp decline in the abundance of this fish in the pelagic zone. The two copepods, Cyclops scutifer and Eudiaptomus graciloides , and the small cladoceran Bosmina longispina , were the only abundant plankton species in the limnetic zone prior to the stock reduction program. A slight increase in the density, biomass and relative importance of B.longispina, Holopedium gibberum and Daphnia longispina occurred from 1984 to 1989, reaching a maximum in 1989. An increased body length of ovigerous B.longispina was also observed. These changes seemed to coincide with the reduction in abundance of Arctic charr in the limnetic zone, suggesting a regulatory role of the charr. A decline in 1990, and a total collapse in the cladoceran compartment in 1991, occurred simultaneously with observations of high densities of threespine sticklebacks in Takvatn. After a mass die-off of this fish, B.longirostris contributed strongly to the zooplankton community as the only cladoceran in 1992. Along with the re-occurrence of B.longispina and H.gibberwn in 1993, the importance of B.longirostris diminished. The highest total zooplankton biomass ever registered was found this year. |
format |
Text |
author |
Dahl-Hansen, Geir A.P. |
author_facet |
Dahl-Hansen, Geir A.P. |
author_sort |
Dahl-Hansen, Geir A.P. |
title |
Long-term changes in crustacean zooplankton--the effects of a mass removal of Arctic chan, Salvelinus alpinus (L.), from an oligotrophic lake |
title_short |
Long-term changes in crustacean zooplankton--the effects of a mass removal of Arctic chan, Salvelinus alpinus (L.), from an oligotrophic lake |
title_full |
Long-term changes in crustacean zooplankton--the effects of a mass removal of Arctic chan, Salvelinus alpinus (L.), from an oligotrophic lake |
title_fullStr |
Long-term changes in crustacean zooplankton--the effects of a mass removal of Arctic chan, Salvelinus alpinus (L.), from an oligotrophic lake |
title_full_unstemmed |
Long-term changes in crustacean zooplankton--the effects of a mass removal of Arctic chan, Salvelinus alpinus (L.), from an oligotrophic lake |
title_sort |
long-term changes in crustacean zooplankton--the effects of a mass removal of arctic chan, salvelinus alpinus (l.), from an oligotrophic lake |
publisher |
Oxford University Press |
publishDate |
1995 |
url |
http://plankt.oxfordjournals.org/cgi/content/short/17/9/1819 https://doi.org/10.1093/plankt/17.9.1819 |
geographic |
Arctic Norway |
geographic_facet |
Arctic Norway |
genre |
Arctic charr Arctic North Norway Salvelinus alpinus Zooplankton Copepods |
genre_facet |
Arctic charr Arctic North Norway Salvelinus alpinus Zooplankton Copepods |
op_relation |
http://plankt.oxfordjournals.org/cgi/content/short/17/9/1819 http://dx.doi.org/10.1093/plankt/17.9.1819 |
op_rights |
Copyright (C) 1995, Oxford University Press |
op_doi |
https://doi.org/10.1093/plankt/17.9.1819 |
container_title |
Journal of Plankton Research |
container_volume |
17 |
container_issue |
9 |
container_start_page |
1819 |
op_container_end_page |
1833 |
_version_ |
1766304015150219264 |