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Submerged vegetation and the variation in the autumn waterfowl Community at lake Tåkern, Southern Sweden.

Nilsson, Leif LU ; Millberg, Per; Gezelius, Lars; Blindow, Irmgaard and Tyrberg, Tommy (2002) In Ornis Fennica 79. p.72-81
Abstract
We analysed data from 25 years of standardised mid-September counts of waterfowl at eutrophic Lake Tåkern, southern Sweden. For eight species, counts were compared with a national index constructed from similar counts at numerous lakes and coastal sites. For Crested Grebes and Mute Swans there was a correlation between counts at Lake Tåkern and the national index, suggesting that they simultaneously vary in number over a large geographic area . Indirect gradient analysis (PCA) revealed a strong temporal trend in the data, which was covaried out in a partial PCA to expose residual patterns. This ordination separated Pochards and Tufted Ducks at one end of the first axis from Cormorants and Goosanders at the other. A direct gradient... (More)
We analysed data from 25 years of standardised mid-September counts of waterfowl at eutrophic Lake Tåkern, southern Sweden. For eight species, counts were compared with a national index constructed from similar counts at numerous lakes and coastal sites. For Crested Grebes and Mute Swans there was a correlation between counts at Lake Tåkern and the national index, suggesting that they simultaneously vary in number over a large geographic area . Indirect gradient analysis (PCA) revealed a strong temporal trend in the data, which was covaried out in a partial PCA to expose residual patterns. This ordination separated Pochards and Tufted Ducks at one end of the first axis from Cormorants and Goosanders at the other. A direct gradient analysis, with biomass of submerged macrophytes (recorded for 14 of the 25 years) as the sole
environmental variable, showed that bird species composition varied significantly
with plant biomass. The piscivores, Cormorants and Goosanders, were abundant in years with small amounts of plant biomass, while several species were most abundant in years with large amounts. Our analyses suggest that the abundance of submerged macrophytes is an important determinant of the bird community composition in eutrophic lakes. (Less)
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author
organization
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type
Contribution to journal
publication status
published
subject
in
Ornis Fennica
volume
79
pages
72 - 81
publisher
BirdLife Finland
external identifiers
  • scopus:0036064780
ISSN
0030-5685
language
English
LU publication?
yes
id
89ce381a-bdd7-44b5-81ac-94eabaef6fc3
date added to LUP
2016-12-12 14:59:29
date last changed
2017-04-03 14:58:04
@article{89ce381a-bdd7-44b5-81ac-94eabaef6fc3,
  abstract     = {We analysed data from 25 years of standardised mid-September counts of waterfowl at eutrophic Lake Tåkern, southern Sweden. For eight species, counts were compared with a national index constructed from similar counts at numerous lakes and coastal sites. For Crested Grebes and Mute Swans there was a correlation between counts at Lake Tåkern and the national index, suggesting that they simultaneously vary in number over a large geographic area . Indirect gradient analysis (PCA) revealed a strong temporal trend in the data, which was covaried out in a partial PCA to expose residual patterns. This ordination separated Pochards and Tufted Ducks at one end of the first axis from Cormorants and Goosanders at the other. A direct gradient analysis, with biomass of submerged macrophytes (recorded for 14 of the 25 years) as the sole<br/>environmental variable, showed that bird species composition varied significantly<br/>with plant biomass. The piscivores, Cormorants and Goosanders, were abundant in years with small amounts of plant biomass, while several species were most abundant in years with large amounts. Our analyses suggest that the abundance of submerged macrophytes is an important determinant of the bird community composition in eutrophic lakes.},
  author       = {Nilsson, Leif and Millberg, Per and Gezelius, Lars and Blindow, Irmgaard and Tyrberg, Tommy},
  issn         = {0030-5685},
  language     = {eng},
  pages        = {72--81},
  publisher    = {BirdLife Finland},
  series       = {Ornis Fennica},
  title        = {Submerged vegetation and the variation in the autumn waterfowl Community at lake Tåkern, Southern Sweden.},
  volume       = {79},
  year         = {2002},
}