Dietary overlap in inshore notothenioid fish from the Danco Coast, western Antarctic Peninsula
We carried out a dietary overlap analysis between notothenioid species by examining the stomach contents of more than 900 specimens collected in a fish assemblage at the Danco Coast, western Antarctic Peninsula, in the summer of 2000. Prey reoccurrences among fish species were 32.2%, with krill Euph...
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Norwegian Polar Institute
2013
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Online Access: | https://doi.org/10.3402/polar.v32i0.21319 https://doaj.org/article/b7d6da4058a442e78707e318d6b4ee60 |
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fttriple:oai:gotriple.eu:oai:doaj.org/article:b7d6da4058a442e78707e318d6b4ee60 2023-05-15T13:32:08+02:00 Dietary overlap in inshore notothenioid fish from the Danco Coast, western Antarctic Peninsula Ricardo Casaux Esteban Barrera-Oro 2013-10-01 https://doi.org/10.3402/polar.v32i0.21319 https://doaj.org/article/b7d6da4058a442e78707e318d6b4ee60 en eng Norwegian Polar Institute doi:10.3402/polar.v32i0.21319 0800-0395 1751-8369 https://doaj.org/article/b7d6da4058a442e78707e318d6b4ee60 undefined Polar Research, Vol 32, Iss 0, Pp 1-8 (2013) Fish dietary overlap notothenioid fish Antarctic Peninsula envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2013 fttriple https://doi.org/10.3402/polar.v32i0.21319 2023-01-22T17:50:17Z We carried out a dietary overlap analysis between notothenioid species by examining the stomach contents of more than 900 specimens collected in a fish assemblage at the Danco Coast, western Antarctic Peninsula, in the summer of 2000. Prey reoccurrences among fish species were 32.2%, with krill Euphausia superba, salps and the gammaridean Prostebeingia longicornis the most reoccurring prey. The diet similarity between species pairs was lower than 55%, in accordance with similar fish assemblages in the South Orkney Islands, the South Shetland Islands and the Antarctic Peninsula. Whereas at those localities the higher prey overlap was between krill-feeding fish species, at the Danco Coast it was between Trematomus bernacchii and Lepidonotothen nudifrons, Notothenia coriiceps and Notothenia rossii, N. coriiceps and Parachaenichthyis charcoti, and Trematomus newnesi and N. rossii, which shared primarily gammaridean amphipods, algae, fish and krill, respectively. Krill is normally the main prey of fish in summer in inshore waters of the western Antarctic Peninsula, but its density in January/February 2000 was notably lower than in previous years. Therefore, at the Danco Coast, under conditions of krill shortage, most of the notothenioid species foraged more intensively on alternative prey, such as gammarideans, fish and algae. The difference between areas in the pattern of dietary overlap might be related to differences in prey availability between years and to the degree of competition for targeted prey. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Euphausia superba Notothenia rossii Polar Research South Orkney Islands South Shetland Islands Unknown Antarctic Antarctic Peninsula Danco ENVELOPE(-61.033,-61.033,-64.717,-64.717) Danco Coast ENVELOPE(-62.000,-62.000,-64.700,-64.700) South Orkney Islands ENVELOPE(-45.500,-45.500,-60.583,-60.583) South Shetland Islands The Antarctic Polar Research 32 1 21319 |
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Open Polar |
collection |
Unknown |
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fttriple |
language |
English |
topic |
Fish dietary overlap notothenioid fish Antarctic Peninsula envir geo |
spellingShingle |
Fish dietary overlap notothenioid fish Antarctic Peninsula envir geo Ricardo Casaux Esteban Barrera-Oro Dietary overlap in inshore notothenioid fish from the Danco Coast, western Antarctic Peninsula |
topic_facet |
Fish dietary overlap notothenioid fish Antarctic Peninsula envir geo |
description |
We carried out a dietary overlap analysis between notothenioid species by examining the stomach contents of more than 900 specimens collected in a fish assemblage at the Danco Coast, western Antarctic Peninsula, in the summer of 2000. Prey reoccurrences among fish species were 32.2%, with krill Euphausia superba, salps and the gammaridean Prostebeingia longicornis the most reoccurring prey. The diet similarity between species pairs was lower than 55%, in accordance with similar fish assemblages in the South Orkney Islands, the South Shetland Islands and the Antarctic Peninsula. Whereas at those localities the higher prey overlap was between krill-feeding fish species, at the Danco Coast it was between Trematomus bernacchii and Lepidonotothen nudifrons, Notothenia coriiceps and Notothenia rossii, N. coriiceps and Parachaenichthyis charcoti, and Trematomus newnesi and N. rossii, which shared primarily gammaridean amphipods, algae, fish and krill, respectively. Krill is normally the main prey of fish in summer in inshore waters of the western Antarctic Peninsula, but its density in January/February 2000 was notably lower than in previous years. Therefore, at the Danco Coast, under conditions of krill shortage, most of the notothenioid species foraged more intensively on alternative prey, such as gammarideans, fish and algae. The difference between areas in the pattern of dietary overlap might be related to differences in prey availability between years and to the degree of competition for targeted prey. |
format |
Article in Journal/Newspaper |
author |
Ricardo Casaux Esteban Barrera-Oro |
author_facet |
Ricardo Casaux Esteban Barrera-Oro |
author_sort |
Ricardo Casaux |
title |
Dietary overlap in inshore notothenioid fish from the Danco Coast, western Antarctic Peninsula |
title_short |
Dietary overlap in inshore notothenioid fish from the Danco Coast, western Antarctic Peninsula |
title_full |
Dietary overlap in inshore notothenioid fish from the Danco Coast, western Antarctic Peninsula |
title_fullStr |
Dietary overlap in inshore notothenioid fish from the Danco Coast, western Antarctic Peninsula |
title_full_unstemmed |
Dietary overlap in inshore notothenioid fish from the Danco Coast, western Antarctic Peninsula |
title_sort |
dietary overlap in inshore notothenioid fish from the danco coast, western antarctic peninsula |
publisher |
Norwegian Polar Institute |
publishDate |
2013 |
url |
https://doi.org/10.3402/polar.v32i0.21319 https://doaj.org/article/b7d6da4058a442e78707e318d6b4ee60 |
long_lat |
ENVELOPE(-61.033,-61.033,-64.717,-64.717) ENVELOPE(-62.000,-62.000,-64.700,-64.700) ENVELOPE(-45.500,-45.500,-60.583,-60.583) |
geographic |
Antarctic Antarctic Peninsula Danco Danco Coast South Orkney Islands South Shetland Islands The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula Danco Danco Coast South Orkney Islands South Shetland Islands The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Euphausia superba Notothenia rossii Polar Research South Orkney Islands South Shetland Islands |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Euphausia superba Notothenia rossii Polar Research South Orkney Islands South Shetland Islands |
op_source |
Polar Research, Vol 32, Iss 0, Pp 1-8 (2013) |
op_relation |
doi:10.3402/polar.v32i0.21319 0800-0395 1751-8369 https://doaj.org/article/b7d6da4058a442e78707e318d6b4ee60 |
op_rights |
undefined |
op_doi |
https://doi.org/10.3402/polar.v32i0.21319 |
container_title |
Polar Research |
container_volume |
32 |
container_issue |
1 |
container_start_page |
21319 |
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