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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ftdoajarticles:oai:doaj.org/article:b7d6da4058a442e78707e318d6b4ee60 2023-05-15T13:54:29+02:00 Dietary overlap in inshore notothenioid fish from the Danco Coast, western Antarctic Peninsula Ricardo Casaux Esteban Barrera-Oro 2013-10-01T00:00:00Z https://doi.org/10.3402/polar.v32i0.21319 https://doaj.org/article/b7d6da4058a442e78707e318d6b4ee60 EN eng Norwegian Polar Institute www.polarresearch.net/index.php/polar/article/download/21319/pdf_1 https://doaj.org/toc/0800-0395 https://doaj.org/toc/1751-8369 doi:10.3402/polar.v32i0.21319 0800-0395 1751-8369 https://doaj.org/article/b7d6da4058a442e78707e318d6b4ee60 Polar Research, Vol 32, Iss 0, Pp 1-8 (2013) Fish dietary overlap notothenioid fish Antarctic Peninsula Environmental sciences GE1-350 Oceanography GC1-1581 article 2013 ftdoajarticles https://doi.org/10.3402/polar.v32i0.21319 2022-12-31T02:58:53Z 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 Directory of Open Access Journals: DOAJ Articles Antarctic The Antarctic Antarctic Peninsula South Shetland Islands South Orkney Islands ENVELOPE(-45.500,-45.500,-60.583,-60.583) Danco ENVELOPE(-61.033,-61.033,-64.717,-64.717) Danco Coast ENVELOPE(-62.000,-62.000,-64.700,-64.700) Polar Research 32 1 21319 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Fish dietary overlap notothenioid fish Antarctic Peninsula Environmental sciences GE1-350 Oceanography GC1-1581 |
spellingShingle |
Fish dietary overlap notothenioid fish Antarctic Peninsula Environmental sciences GE1-350 Oceanography GC1-1581 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 Environmental sciences GE1-350 Oceanography GC1-1581 |
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(-45.500,-45.500,-60.583,-60.583) ENVELOPE(-61.033,-61.033,-64.717,-64.717) ENVELOPE(-62.000,-62.000,-64.700,-64.700) |
geographic |
Antarctic The Antarctic Antarctic Peninsula South Shetland Islands South Orkney Islands Danco Danco Coast |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula South Shetland Islands South Orkney Islands Danco Danco Coast |
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 |
www.polarresearch.net/index.php/polar/article/download/21319/pdf_1 https://doaj.org/toc/0800-0395 https://doaj.org/toc/1751-8369 doi:10.3402/polar.v32i0.21319 0800-0395 1751-8369 https://doaj.org/article/b7d6da4058a442e78707e318d6b4ee60 |
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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1766260419344728064 |