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The influence of food quality and availability on trophic position, carbon signature, and growth rate of an omnivorous crayfish

Olsson, Karin LU ; Nyström, Per LU ; Stenroth, Patrik LU ; Nilsson, Erika LU ; Svensson, Marie LU and Granéli, Wilhelm LU (2008) In Canadian Journal of Fisheries and Aquatic Sciences 65(10). p.2293-2304
Abstract
Fourteen sites in 13 streams were surveyed to address the importance of food quality and quantity on trophic position, carbon signature, and growth rate of noble crayfish (Astacus astacus) by combining the analyses of gut content, stable isotopes, and RNA-DNA ratio. The gut content analysis showed an omnivorous feeding habit, but total animal food sources contributed more to the nitrogen and carbon isotope signals of this species. The biomass of invertebrates (i.e., high quality food) influenced the trophic position, carbon signature, and growth rate. Our results show that crayfish in streams with a high biomass of invertebrates were at a higher trophic position and had a higher growth rate than crayfish in streams with a low biomass of... (More)
Fourteen sites in 13 streams were surveyed to address the importance of food quality and quantity on trophic position, carbon signature, and growth rate of noble crayfish (Astacus astacus) by combining the analyses of gut content, stable isotopes, and RNA-DNA ratio. The gut content analysis showed an omnivorous feeding habit, but total animal food sources contributed more to the nitrogen and carbon isotope signals of this species. The biomass of invertebrates (i.e., high quality food) influenced the trophic position, carbon signature, and growth rate. Our results show that crayfish in streams with a high biomass of invertebrates were at a higher trophic position and had a higher growth rate than crayfish in streams with a low biomass of invertebrates. A high biomass of relatively sedentary invertebrates indicates a habitat with high algae biomass, which is reflected in the more autochthonous carbon signature of crayfish. Further, noble crayfish in temperate streams seem to have dual functional roles by acting as predator and as shredder by processing large amounts of detritus. (Less)
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type
Contribution to journal
publication status
published
subject
in
Canadian Journal of Fisheries and Aquatic Sciences
volume
65
issue
10
pages
2293 - 2304
publisher
National Research Council Canada
external identifiers
  • wos:000260168000020
  • scopus:54249086294
ISSN
1205-7533
DOI
10.1139/F08-137
language
English
LU publication?
yes
id
8f2b3502-100f-4430-af27-90dceb3af3a3 (old id 1284794)
date added to LUP
2009-02-06 16:22:46
date last changed
2017-06-25 03:38:03
@article{8f2b3502-100f-4430-af27-90dceb3af3a3,
  abstract     = {Fourteen sites in 13 streams were surveyed to address the importance of food quality and quantity on trophic position, carbon signature, and growth rate of noble crayfish (Astacus astacus) by combining the analyses of gut content, stable isotopes, and RNA-DNA ratio. The gut content analysis showed an omnivorous feeding habit, but total animal food sources contributed more to the nitrogen and carbon isotope signals of this species. The biomass of invertebrates (i.e., high quality food) influenced the trophic position, carbon signature, and growth rate. Our results show that crayfish in streams with a high biomass of invertebrates were at a higher trophic position and had a higher growth rate than crayfish in streams with a low biomass of invertebrates. A high biomass of relatively sedentary invertebrates indicates a habitat with high algae biomass, which is reflected in the more autochthonous carbon signature of crayfish. Further, noble crayfish in temperate streams seem to have dual functional roles by acting as predator and as shredder by processing large amounts of detritus.},
  author       = {Olsson, Karin and Nyström, Per and Stenroth, Patrik and Nilsson, Erika and Svensson, Marie and Granéli, Wilhelm},
  issn         = {1205-7533},
  language     = {eng},
  number       = {10},
  pages        = {2293--2304},
  publisher    = {National Research Council Canada},
  series       = {Canadian Journal of Fisheries and Aquatic Sciences},
  title        = {The influence of food quality and availability on trophic position, carbon signature, and growth rate of an omnivorous crayfish},
  url          = {http://dx.doi.org/10.1139/F08-137},
  volume       = {65},
  year         = {2008},
}