No evidence of optimal foraging in chick-raising black-legged kittiwakes (Rissa tridactyla) in the Southern Barents Sea
The black-legged kittiwake (Rissa Tridactyla) situation is getting more serious as the population numbers have declined over the last decades, and this well-known species is now considered endangered (EN) in the Norwegian redlist 2010. This study investigates the differences between adult and chick...
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Universitetet i Tromsø
2013
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ftunivtroemsoe:oai:munin.uit.no:10037/5494 2023-05-15T15:10:03+02:00 No evidence of optimal foraging in chick-raising black-legged kittiwakes (Rissa tridactyla) in the Southern Barents Sea Thorvaldsen, Renate 2013-05-21 https://hdl.handle.net/10037/5494 eng eng Universitetet i Tromsø University of Tromsø https://hdl.handle.net/10037/5494 URN:NBN:no-uit_munin_5197 openAccess Copyright 2013 The Author(s) arctic biology marine biology VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Økologi: 488 VDP::Mathematics and natural science: 400::Zoology and botany: 480::Ecology: 488 BIO-3950 Master thesis Mastergradsoppgave 2013 ftunivtroemsoe 2021-06-25T17:53:42Z The black-legged kittiwake (Rissa Tridactyla) situation is getting more serious as the population numbers have declined over the last decades, and this well-known species is now considered endangered (EN) in the Norwegian redlist 2010. This study investigates the differences between adult and chick diet considering prey selection to be an important point. Earlier chick diet has been considered a proxy for adult diet, but the optimal-foraging theory suggests that this may not be accurate. Knowing the composition of both adult and chick diet is important for further preservation of the species. Studies of differences between self-feeding and chick provisioning have been carried out on several occasions, and the theory has been confirmed in several species such as the common guillemot (Uria aalge) and cape petrel (Daption capense), but never in kittiwakes. The water offloading method was used to sample stomach samples that were compared to regurgitated samples that indicate chick diet. Differences in diet were based on frequency of occurrence, and differences in total fish length of prey animals. Knowing the true diet of adult kittiwakes has important implications on how to manage the Norwegian populations. This study showed no signs of optimal foraging for kittiwakes during the 2012 breeding season. The main prey for both adults and chicks was capelin. Master Thesis Arctic Barents Sea Black-legged Kittiwake Cape Petrel common guillemot Daption capense rissa tridactyla Uria aalge uria University of Tromsø: Munin Open Research Archive Arctic Barents Sea |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
arctic biology marine biology VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Økologi: 488 VDP::Mathematics and natural science: 400::Zoology and botany: 480::Ecology: 488 BIO-3950 |
spellingShingle |
arctic biology marine biology VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Økologi: 488 VDP::Mathematics and natural science: 400::Zoology and botany: 480::Ecology: 488 BIO-3950 Thorvaldsen, Renate No evidence of optimal foraging in chick-raising black-legged kittiwakes (Rissa tridactyla) in the Southern Barents Sea |
topic_facet |
arctic biology marine biology VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Økologi: 488 VDP::Mathematics and natural science: 400::Zoology and botany: 480::Ecology: 488 BIO-3950 |
description |
The black-legged kittiwake (Rissa Tridactyla) situation is getting more serious as the population numbers have declined over the last decades, and this well-known species is now considered endangered (EN) in the Norwegian redlist 2010. This study investigates the differences between adult and chick diet considering prey selection to be an important point. Earlier chick diet has been considered a proxy for adult diet, but the optimal-foraging theory suggests that this may not be accurate. Knowing the composition of both adult and chick diet is important for further preservation of the species. Studies of differences between self-feeding and chick provisioning have been carried out on several occasions, and the theory has been confirmed in several species such as the common guillemot (Uria aalge) and cape petrel (Daption capense), but never in kittiwakes. The water offloading method was used to sample stomach samples that were compared to regurgitated samples that indicate chick diet. Differences in diet were based on frequency of occurrence, and differences in total fish length of prey animals. Knowing the true diet of adult kittiwakes has important implications on how to manage the Norwegian populations. This study showed no signs of optimal foraging for kittiwakes during the 2012 breeding season. The main prey for both adults and chicks was capelin. |
format |
Master Thesis |
author |
Thorvaldsen, Renate |
author_facet |
Thorvaldsen, Renate |
author_sort |
Thorvaldsen, Renate |
title |
No evidence of optimal foraging in chick-raising black-legged kittiwakes (Rissa tridactyla) in the Southern Barents Sea |
title_short |
No evidence of optimal foraging in chick-raising black-legged kittiwakes (Rissa tridactyla) in the Southern Barents Sea |
title_full |
No evidence of optimal foraging in chick-raising black-legged kittiwakes (Rissa tridactyla) in the Southern Barents Sea |
title_fullStr |
No evidence of optimal foraging in chick-raising black-legged kittiwakes (Rissa tridactyla) in the Southern Barents Sea |
title_full_unstemmed |
No evidence of optimal foraging in chick-raising black-legged kittiwakes (Rissa tridactyla) in the Southern Barents Sea |
title_sort |
no evidence of optimal foraging in chick-raising black-legged kittiwakes (rissa tridactyla) in the southern barents sea |
publisher |
Universitetet i Tromsø |
publishDate |
2013 |
url |
https://hdl.handle.net/10037/5494 |
geographic |
Arctic Barents Sea |
geographic_facet |
Arctic Barents Sea |
genre |
Arctic Barents Sea Black-legged Kittiwake Cape Petrel common guillemot Daption capense rissa tridactyla Uria aalge uria |
genre_facet |
Arctic Barents Sea Black-legged Kittiwake Cape Petrel common guillemot Daption capense rissa tridactyla Uria aalge uria |
op_relation |
https://hdl.handle.net/10037/5494 URN:NBN:no-uit_munin_5197 |
op_rights |
openAccess Copyright 2013 The Author(s) |
_version_ |
1766341118347182080 |