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Food quality for Daphnia in humic and clear water lakes

Gutseit, Kelly LU ; Berglund, Olof LU and Granéli, Wilhelm LU (2007) In Freshwater Biology 52(2). p.344-356
Abstract
1. Growth and reproduction of Daphnia fed lake seston were measured in two categories of meso- to eutrophic lakes differing with respect to terrestrial organic matter influence (humic and clear water lakes). The content of highly unsaturated fatty acids (HUFA), P and N, as well as the taxonomical composition of seston were analysed.2. Seston HUFA and C : P ratios were similar between lake categories, whereas C : N ratios were lower in the clear water lakes in both spring and summer. Despite the similarity in HUFA and P content of seston, Daphnia growth rate, clutch size and the proportion of gravid females were, respectively, about 1.5, 3 and 6 times higher in the clear water lakes.3. Differences in growth and reproduction were related to... (More)
1. Growth and reproduction of Daphnia fed lake seston were measured in two categories of meso- to eutrophic lakes differing with respect to terrestrial organic matter influence (humic and clear water lakes). The content of highly unsaturated fatty acids (HUFA), P and N, as well as the taxonomical composition of seston were analysed.2. Seston HUFA and C : P ratios were similar between lake categories, whereas C : N ratios were lower in the clear water lakes in both spring and summer. Despite the similarity in HUFA and P content of seston, Daphnia growth rate, clutch size and the proportion of gravid females were, respectively, about 1.5, 3 and 6 times higher in the clear water lakes.3. Differences in growth and reproduction were related to a combination of higher N content and good fatty acid quality of the seston in the clear water lakes. Relatively high biomass of edible algae, such as Rhodomonas sp. and Cryptomonas sp., in the clear water lakes, and differences in water pH likely contributed to the observed differences in Daphnia growth and reproduction between lake categories. Additionally, it is possible that Daphnia was energy limited in the humic lakes despite high particulate organic carbon (POC) concentrations, as the contribution of non-algal and detrital C to the POC pool was high.4. Our results suggest that dietary HUFA content has the potential to improve herbivore growth and reproduction if N and P are not limiting. N merits more attention in studies of zooplankton nutrition. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Freshwater Biology
volume
52
issue
2
pages
344 - 356
publisher
Wiley-Blackwell
external identifiers
  • wos:000243473600013
  • scopus:33846209112
ISSN
0046-5070
DOI
10.1111/j.1365-2427.2006.01697.x
language
English
LU publication?
yes
id
92c8be1a-76f4-4df3-8c94-a9e93498d94f (old id 167065)
date added to LUP
2007-06-27 09:37:29
date last changed
2017-01-01 06:41:03
@article{92c8be1a-76f4-4df3-8c94-a9e93498d94f,
  abstract     = {1. Growth and reproduction of Daphnia fed lake seston were measured in two categories of meso- to eutrophic lakes differing with respect to terrestrial organic matter influence (humic and clear water lakes). The content of highly unsaturated fatty acids (HUFA), P and N, as well as the taxonomical composition of seston were analysed.2. Seston HUFA and C : P ratios were similar between lake categories, whereas C : N ratios were lower in the clear water lakes in both spring and summer. Despite the similarity in HUFA and P content of seston, Daphnia growth rate, clutch size and the proportion of gravid females were, respectively, about 1.5, 3 and 6 times higher in the clear water lakes.3. Differences in growth and reproduction were related to a combination of higher N content and good fatty acid quality of the seston in the clear water lakes. Relatively high biomass of edible algae, such as Rhodomonas sp. and Cryptomonas sp., in the clear water lakes, and differences in water pH likely contributed to the observed differences in Daphnia growth and reproduction between lake categories. Additionally, it is possible that Daphnia was energy limited in the humic lakes despite high particulate organic carbon (POC) concentrations, as the contribution of non-algal and detrital C to the POC pool was high.4. Our results suggest that dietary HUFA content has the potential to improve herbivore growth and reproduction if N and P are not limiting. N merits more attention in studies of zooplankton nutrition.},
  author       = {Gutseit, Kelly and Berglund, Olof and Granéli, Wilhelm},
  issn         = {0046-5070},
  language     = {eng},
  number       = {2},
  pages        = {344--356},
  publisher    = {Wiley-Blackwell},
  series       = {Freshwater Biology},
  title        = {Food quality for Daphnia in humic and clear water lakes},
  url          = {http://dx.doi.org/10.1111/j.1365-2427.2006.01697.x},
  volume       = {52},
  year         = {2007},
}