Differential isotopic turnover (C and N) detected in Antarctic scavenger amphipods
Metabolic activity is positively related to temperature, inversely to body mass and is a function of taxon specific life style features, in particular activity such as level of active movement. Therefore, the isotope signal transfer velocity is expected to be lower in cold environments and in larger...
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ftorbi:oai:orbi.ulg.ac.be:2268/71730 2024-04-21T07:52:29+00:00 Differential isotopic turnover (C and N) detected in Antarctic scavenger amphipods Nyssen, Fabienne Michel, Loïc Dauby, Patrick Brey, Thomas 2008-08 https://orbi.uliege.be/handle/2268/71730 en eng https://orbi.uliege.be/handle/2268/71730 info:hdl:2268/71730 6th International Conference of Applications of Stable Isotope Techniques to Ecological Studies, Honolulu, United States - Hawaii [US-HI], August 2008 Life sciences Zoology Sciences du vivant Zoologie conference poster not in proceedings http://purl.org/coar/resource_type/c_18co info:eu-repo/semantics/conferencePoster 2008 ftorbi 2024-03-27T14:43:21Z Metabolic activity is positively related to temperature, inversely to body mass and is a function of taxon specific life style features, in particular activity such as level of active movement. Therefore, the isotope signal transfer velocity is expected to be lower in cold environments and in larger as well as less active organisms. Our study explores whether this may be a problem in trophic studies of a comparatively “slow” because cold system such as the high Antarctic shelf ecosystem and in comparatively large organisms such as benthic amphipod species within this system. We compare experimentally the velocity of stable isotope signal transfer from prey to consumer in three lysianassoid amphipods, Waldeckia obesa, Abyssorchomene plebs and Pseudorchomene coatsi. They have similar alimentation, but different size and lifestyle. Indeed, W. obesa is a very sedentary species spending most of the time immobilized on diverse substrates whereas P. coatsi is very motile, swimming rapidly around the aquarium. The third species, A. plebs has an intermediate behaviour, sharing time between short swim and resting on bottom. Those species also differ significantly in size: and are good representative of scavenger trophic guild on Antarctic shelf. After being starved, amphipods were kept by species and fed ad libitum with lyophilized fish during fifty days. Individuals were sacrificed weekly for isotopic analysis. At the end of the 7-week incubation with standardized food, rank correlation of δ13C and δ15N against time did not show any consistent trend for A. plebs (δ13C: p = 0.51 and δ15N p = 0.04) neither for the species W. obesa (δ13C: p = 0.77 and δ15N p = 0.26). By contrast, for P. coatsi, rank correlations were highly significant (p < 0.0001). The linear regression illustrated a clear increase of isotopic ratios all along the experiment. This metabolic discrepancy between species is probably a size-mass effect. Furthermore, for this species, ANCOVA of the individually measured isotopic ratios first transformed to ... Conference Object Antarc* Antarctic University of Liège: ORBi (Open Repository and Bibliography) |
institution |
Open Polar |
collection |
University of Liège: ORBi (Open Repository and Bibliography) |
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ftorbi |
language |
English |
topic |
Life sciences Zoology Sciences du vivant Zoologie |
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Life sciences Zoology Sciences du vivant Zoologie Nyssen, Fabienne Michel, Loïc Dauby, Patrick Brey, Thomas Differential isotopic turnover (C and N) detected in Antarctic scavenger amphipods |
topic_facet |
Life sciences Zoology Sciences du vivant Zoologie |
description |
Metabolic activity is positively related to temperature, inversely to body mass and is a function of taxon specific life style features, in particular activity such as level of active movement. Therefore, the isotope signal transfer velocity is expected to be lower in cold environments and in larger as well as less active organisms. Our study explores whether this may be a problem in trophic studies of a comparatively “slow” because cold system such as the high Antarctic shelf ecosystem and in comparatively large organisms such as benthic amphipod species within this system. We compare experimentally the velocity of stable isotope signal transfer from prey to consumer in three lysianassoid amphipods, Waldeckia obesa, Abyssorchomene plebs and Pseudorchomene coatsi. They have similar alimentation, but different size and lifestyle. Indeed, W. obesa is a very sedentary species spending most of the time immobilized on diverse substrates whereas P. coatsi is very motile, swimming rapidly around the aquarium. The third species, A. plebs has an intermediate behaviour, sharing time between short swim and resting on bottom. Those species also differ significantly in size: and are good representative of scavenger trophic guild on Antarctic shelf. After being starved, amphipods were kept by species and fed ad libitum with lyophilized fish during fifty days. Individuals were sacrificed weekly for isotopic analysis. At the end of the 7-week incubation with standardized food, rank correlation of δ13C and δ15N against time did not show any consistent trend for A. plebs (δ13C: p = 0.51 and δ15N p = 0.04) neither for the species W. obesa (δ13C: p = 0.77 and δ15N p = 0.26). By contrast, for P. coatsi, rank correlations were highly significant (p < 0.0001). The linear regression illustrated a clear increase of isotopic ratios all along the experiment. This metabolic discrepancy between species is probably a size-mass effect. Furthermore, for this species, ANCOVA of the individually measured isotopic ratios first transformed to ... |
format |
Conference Object |
author |
Nyssen, Fabienne Michel, Loïc Dauby, Patrick Brey, Thomas |
author_facet |
Nyssen, Fabienne Michel, Loïc Dauby, Patrick Brey, Thomas |
author_sort |
Nyssen, Fabienne |
title |
Differential isotopic turnover (C and N) detected in Antarctic scavenger amphipods |
title_short |
Differential isotopic turnover (C and N) detected in Antarctic scavenger amphipods |
title_full |
Differential isotopic turnover (C and N) detected in Antarctic scavenger amphipods |
title_fullStr |
Differential isotopic turnover (C and N) detected in Antarctic scavenger amphipods |
title_full_unstemmed |
Differential isotopic turnover (C and N) detected in Antarctic scavenger amphipods |
title_sort |
differential isotopic turnover (c and n) detected in antarctic scavenger amphipods |
publishDate |
2008 |
url |
https://orbi.uliege.be/handle/2268/71730 |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
6th International Conference of Applications of Stable Isotope Techniques to Ecological Studies, Honolulu, United States - Hawaii [US-HI], August 2008 |
op_relation |
https://orbi.uliege.be/handle/2268/71730 info:hdl:2268/71730 |
_version_ |
1796935716026974208 |