Cannibalism and trophic structure in a high Arctic lake: insights from stable-isotope analysis
Stable-nitrogen ( 15 N/ 14 N) isotope ratios (from 2.1‰ in moss to 14.5‰ in Arctic char, Salvelinus alpinus), showed enrichment with trophic level in the food web of Char Lake, Northwest Territories, and may be used to infer trophic position. The average 15 N enrichment of 1.5‰ between moss or algae...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Canadian Science Publishing
1995
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1139/f95-116 http://www.nrcresearchpress.com/doi/pdf/10.1139/f95-116 |
id |
crcansciencepubl:10.1139/f95-116 |
---|---|
record_format |
openpolar |
spelling |
crcansciencepubl:10.1139/f95-116 2024-05-12T07:59:01+00:00 Cannibalism and trophic structure in a high Arctic lake: insights from stable-isotope analysis Hobson, Keith A. Welch, Harold E. 1995 http://dx.doi.org/10.1139/f95-116 http://www.nrcresearchpress.com/doi/pdf/10.1139/f95-116 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 52, issue 6, page 1195-1201 ISSN 0706-652X 1205-7533 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 1995 crcansciencepubl https://doi.org/10.1139/f95-116 2024-04-18T06:54:52Z Stable-nitrogen ( 15 N/ 14 N) isotope ratios (from 2.1‰ in moss to 14.5‰ in Arctic char, Salvelinus alpinus), showed enrichment with trophic level in the food web of Char Lake, Northwest Territories, and may be used to infer trophic position. The average 15 N enrichment of 1.5‰ between moss or algae and invertebrates suggests input to the food web of isotopically lighter nitrogen than that measured for these sources of primary production. Stable-carbon ( 13 C/ 12 C) isotope ratios differed between moss and algae by almost 10‰ and indicate that carbon in the Char Lake food web is derived from a blend of these sources of primary production. Arctic char δ 15 N values for muscle tissue were positively correlated with fork length and clustered into three distinct groups: small fish (1–3 cm, mean δ 15 N = 5.7‰), which possibly consumed more benthic particles than previously assumed; intermediate-size fish (10–35 cm, mean δ 15 N = 10‰), which likely depended on larval char as well as their primary zooplankton and chironomid prey; and larger Arctic char, which showed a mean stepwise increase in δ 15 N of 3.7‰. This suggests that complete cannibalism in this population generally occurs abruptly and is exercised by a relatively small number of large individuals. Article in Journal/Newspaper Arctic Northwest Territories Salvelinus alpinus Zooplankton Canadian Science Publishing Arctic Arctic Lake ENVELOPE(-130.826,-130.826,57.231,57.231) Northwest Territories Canadian Journal of Fisheries and Aquatic Sciences 52 6 1195 1201 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Aquatic Science Ecology, Evolution, Behavior and Systematics Hobson, Keith A. Welch, Harold E. Cannibalism and trophic structure in a high Arctic lake: insights from stable-isotope analysis |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
Stable-nitrogen ( 15 N/ 14 N) isotope ratios (from 2.1‰ in moss to 14.5‰ in Arctic char, Salvelinus alpinus), showed enrichment with trophic level in the food web of Char Lake, Northwest Territories, and may be used to infer trophic position. The average 15 N enrichment of 1.5‰ between moss or algae and invertebrates suggests input to the food web of isotopically lighter nitrogen than that measured for these sources of primary production. Stable-carbon ( 13 C/ 12 C) isotope ratios differed between moss and algae by almost 10‰ and indicate that carbon in the Char Lake food web is derived from a blend of these sources of primary production. Arctic char δ 15 N values for muscle tissue were positively correlated with fork length and clustered into three distinct groups: small fish (1–3 cm, mean δ 15 N = 5.7‰), which possibly consumed more benthic particles than previously assumed; intermediate-size fish (10–35 cm, mean δ 15 N = 10‰), which likely depended on larval char as well as their primary zooplankton and chironomid prey; and larger Arctic char, which showed a mean stepwise increase in δ 15 N of 3.7‰. This suggests that complete cannibalism in this population generally occurs abruptly and is exercised by a relatively small number of large individuals. |
format |
Article in Journal/Newspaper |
author |
Hobson, Keith A. Welch, Harold E. |
author_facet |
Hobson, Keith A. Welch, Harold E. |
author_sort |
Hobson, Keith A. |
title |
Cannibalism and trophic structure in a high Arctic lake: insights from stable-isotope analysis |
title_short |
Cannibalism and trophic structure in a high Arctic lake: insights from stable-isotope analysis |
title_full |
Cannibalism and trophic structure in a high Arctic lake: insights from stable-isotope analysis |
title_fullStr |
Cannibalism and trophic structure in a high Arctic lake: insights from stable-isotope analysis |
title_full_unstemmed |
Cannibalism and trophic structure in a high Arctic lake: insights from stable-isotope analysis |
title_sort |
cannibalism and trophic structure in a high arctic lake: insights from stable-isotope analysis |
publisher |
Canadian Science Publishing |
publishDate |
1995 |
url |
http://dx.doi.org/10.1139/f95-116 http://www.nrcresearchpress.com/doi/pdf/10.1139/f95-116 |
long_lat |
ENVELOPE(-130.826,-130.826,57.231,57.231) |
geographic |
Arctic Arctic Lake Northwest Territories |
geographic_facet |
Arctic Arctic Lake Northwest Territories |
genre |
Arctic Northwest Territories Salvelinus alpinus Zooplankton |
genre_facet |
Arctic Northwest Territories Salvelinus alpinus Zooplankton |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 52, issue 6, page 1195-1201 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f95-116 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
52 |
container_issue |
6 |
container_start_page |
1195 |
op_container_end_page |
1201 |
_version_ |
1798839771764621312 |