Feeding in troubled waters: a comparative diet analysis of pink (Oncorhynchus gorbuscha) and chum (O. keta) salmon during their first months at sea in the Broughton Archipelago, British Columbia
Closely related species divide shared resources to reduce interspecific competition and to allow for coexistence when resources are limiting. Upon ocean entry, juvenile pink and chum salmon coexist in mixed schools and feed on similar prey. The diet of juvenile pink and chum salmon during their firs...
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2014
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ftsimonfu:oai:summit.sfu.ca:14264 2023-05-15T17:52:51+02:00 Feeding in troubled waters: a comparative diet analysis of pink (Oncorhynchus gorbuscha) and chum (O. keta) salmon during their first months at sea in the Broughton Archipelago, British Columbia Gulbransen, Christina Olga Marie 2014-06-10 http://summit.sfu.ca/item/14264 unknown etd8439 http://summit.sfu.ca/item/14264 Thesis 2014 ftsimonfu 2022-04-07T18:39:17Z Closely related species divide shared resources to reduce interspecific competition and to allow for coexistence when resources are limiting. Upon ocean entry, juvenile pink and chum salmon coexist in mixed schools and feed on similar prey. The diet of juvenile pink and chum salmon during their first two months at sea in the coastal waters of the Broughton Archipelago, British Columbia, was described for 2003 and 2006. Full stomach rankings suggested a lack of prey limitation in both years. Stomach content analysis revealed a greater diet separation among pink and chum in 2003 than in 2006. Species specific prey preferences were observed. Electivity comparisons of prey consumed with prey available in the plankton indicated selective feeding in both species. Considering the importance of diet in the survival of juvenile salmon and ultimately in adult recruitment, an understanding of prey conditions provides insight into salmon population trends in the region. Thesis Oncorhynchus gorbuscha Summit - SFU Research Repository (Simon Fraser University) Keta ENVELOPE(-19.455,-19.455,65.656,65.656) |
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Open Polar |
collection |
Summit - SFU Research Repository (Simon Fraser University) |
op_collection_id |
ftsimonfu |
language |
unknown |
description |
Closely related species divide shared resources to reduce interspecific competition and to allow for coexistence when resources are limiting. Upon ocean entry, juvenile pink and chum salmon coexist in mixed schools and feed on similar prey. The diet of juvenile pink and chum salmon during their first two months at sea in the coastal waters of the Broughton Archipelago, British Columbia, was described for 2003 and 2006. Full stomach rankings suggested a lack of prey limitation in both years. Stomach content analysis revealed a greater diet separation among pink and chum in 2003 than in 2006. Species specific prey preferences were observed. Electivity comparisons of prey consumed with prey available in the plankton indicated selective feeding in both species. Considering the importance of diet in the survival of juvenile salmon and ultimately in adult recruitment, an understanding of prey conditions provides insight into salmon population trends in the region. |
format |
Thesis |
author |
Gulbransen, Christina Olga Marie |
spellingShingle |
Gulbransen, Christina Olga Marie Feeding in troubled waters: a comparative diet analysis of pink (Oncorhynchus gorbuscha) and chum (O. keta) salmon during their first months at sea in the Broughton Archipelago, British Columbia |
author_facet |
Gulbransen, Christina Olga Marie |
author_sort |
Gulbransen, Christina Olga Marie |
title |
Feeding in troubled waters: a comparative diet analysis of pink (Oncorhynchus gorbuscha) and chum (O. keta) salmon during their first months at sea in the Broughton Archipelago, British Columbia |
title_short |
Feeding in troubled waters: a comparative diet analysis of pink (Oncorhynchus gorbuscha) and chum (O. keta) salmon during their first months at sea in the Broughton Archipelago, British Columbia |
title_full |
Feeding in troubled waters: a comparative diet analysis of pink (Oncorhynchus gorbuscha) and chum (O. keta) salmon during their first months at sea in the Broughton Archipelago, British Columbia |
title_fullStr |
Feeding in troubled waters: a comparative diet analysis of pink (Oncorhynchus gorbuscha) and chum (O. keta) salmon during their first months at sea in the Broughton Archipelago, British Columbia |
title_full_unstemmed |
Feeding in troubled waters: a comparative diet analysis of pink (Oncorhynchus gorbuscha) and chum (O. keta) salmon during their first months at sea in the Broughton Archipelago, British Columbia |
title_sort |
feeding in troubled waters: a comparative diet analysis of pink (oncorhynchus gorbuscha) and chum (o. keta) salmon during their first months at sea in the broughton archipelago, british columbia |
publishDate |
2014 |
url |
http://summit.sfu.ca/item/14264 |
long_lat |
ENVELOPE(-19.455,-19.455,65.656,65.656) |
geographic |
Keta |
geographic_facet |
Keta |
genre |
Oncorhynchus gorbuscha |
genre_facet |
Oncorhynchus gorbuscha |
op_relation |
etd8439 http://summit.sfu.ca/item/14264 |
_version_ |
1766160584291647488 |