Forage fish abundance is a predictor of timing of breeding and hatching brood size in a coastal seabird
Current and future climate alterations might impact ecological processes like timing of breeding. We used multivariate linear models to assess the importance of food availability and climate on timing of breeding and hatching brood size of European shags Phalacrocorax aristotelis in 2 colonies, Skli...
Published in: | Marine Ecology Progress Series |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2015
|
Subjects: | |
Online Access: | http://hdl.handle.net/11250/2396526 https://doi.org/10.3354/meps11100 |
id |
ftninstnf:oai:brage.nina.no:11250/2396526 |
---|---|
record_format |
openpolar |
spelling |
ftninstnf:oai:brage.nina.no:11250/2396526 2024-06-23T07:55:15+00:00 Forage fish abundance is a predictor of timing of breeding and hatching brood size in a coastal seabird Lorentsen, Svein-Håkon Anker-Nilssen, Tycho Erikstad, Kjell E Røv, Nils Norway, Norge, Sklinna, Røst 2015 application/pdf http://hdl.handle.net/11250/2396526 https://doi.org/10.3354/meps11100 eng eng Norges forskningsråd Marine Ecology Progress Series 2015, 519:209-220 urn:issn:0171-8630 http://hdl.handle.net/11250/2396526 https://doi.org/10.3354/meps11100 cristin:1204710 Navngivelse 3.0 Norge http://creativecommons.org/licenses/by/3.0/no/ 519 Marine Ecology Progress Series Phalacrocorax aristotelis Norwegian Sea Timing of breeding Brood size Pollachius virens NAO Journal article Peer reviewed 2015 ftninstnf https://doi.org/10.3354/meps11100 2024-06-07T03:57:56Z Current and future climate alterations might impact ecological processes like timing of breeding. We used multivariate linear models to assess the importance of food availability and climate on timing of breeding and hatching brood size of European shags Phalacrocorax aristotelis in 2 colonies, Sklinna (65° N) and Røst (67° N), in the Norwegian Sea over 21 yr (1989 to 2009). Predictor variables were ICES abundance estimates of young saithe Pollachius virens, the staple food of shags in these colonies, the previous winter’s North Atlantic Oscillation index (wNAO), and sea surface and air temperatures. Annual population size was included to control for density-dependent effects. The best model for hatching date explained 15% (Sklinna) and 70% (Røst) of the variation and showed that shags bred earlier when 1 yr old saithe were more abundant. The model for Røst also included 2 yr old saithe and wNAO. The best model for hatching brood size explained 40% (Sklinna) and 48% (Røst) and included a positive effect of population size at both sites. The model for Røst also included a positive effect of 1 yr old saithe. Our study demonstrates that abundance of 1 yr old saithe is a key factor for the breeding performance of shags in both colonies, whereas the climate variables were of less importance. Delayed breeding and low brood size were not associated with a high population of breeders, indicating breeding performance was density-independent and that the positive relationship between breeding numbers and saithe abundance mainly reflected variation in non-breeding among established breeders. KEY WORDS: Phalacrocorax aristotelis · Norwegian Sea · Timing of breeding · Brood size · Pollachius virens · NAO Article in Journal/Newspaper North Atlantic North Atlantic oscillation Norwegian Sea Norwegian Institute for Nature Research: Brage NINA Norway Norwegian Sea Røst ENVELOPE(11.983,11.983,67.467,67.467) Sklinna ENVELOPE(11.000,11.000,65.200,65.200) Marine Ecology Progress Series 519 209 220 |
institution |
Open Polar |
collection |
Norwegian Institute for Nature Research: Brage NINA |
op_collection_id |
ftninstnf |
language |
English |
topic |
Phalacrocorax aristotelis Norwegian Sea Timing of breeding Brood size Pollachius virens NAO |
spellingShingle |
Phalacrocorax aristotelis Norwegian Sea Timing of breeding Brood size Pollachius virens NAO Lorentsen, Svein-Håkon Anker-Nilssen, Tycho Erikstad, Kjell E Røv, Nils Forage fish abundance is a predictor of timing of breeding and hatching brood size in a coastal seabird |
topic_facet |
Phalacrocorax aristotelis Norwegian Sea Timing of breeding Brood size Pollachius virens NAO |
description |
Current and future climate alterations might impact ecological processes like timing of breeding. We used multivariate linear models to assess the importance of food availability and climate on timing of breeding and hatching brood size of European shags Phalacrocorax aristotelis in 2 colonies, Sklinna (65° N) and Røst (67° N), in the Norwegian Sea over 21 yr (1989 to 2009). Predictor variables were ICES abundance estimates of young saithe Pollachius virens, the staple food of shags in these colonies, the previous winter’s North Atlantic Oscillation index (wNAO), and sea surface and air temperatures. Annual population size was included to control for density-dependent effects. The best model for hatching date explained 15% (Sklinna) and 70% (Røst) of the variation and showed that shags bred earlier when 1 yr old saithe were more abundant. The model for Røst also included 2 yr old saithe and wNAO. The best model for hatching brood size explained 40% (Sklinna) and 48% (Røst) and included a positive effect of population size at both sites. The model for Røst also included a positive effect of 1 yr old saithe. Our study demonstrates that abundance of 1 yr old saithe is a key factor for the breeding performance of shags in both colonies, whereas the climate variables were of less importance. Delayed breeding and low brood size were not associated with a high population of breeders, indicating breeding performance was density-independent and that the positive relationship between breeding numbers and saithe abundance mainly reflected variation in non-breeding among established breeders. KEY WORDS: Phalacrocorax aristotelis · Norwegian Sea · Timing of breeding · Brood size · Pollachius virens · NAO |
format |
Article in Journal/Newspaper |
author |
Lorentsen, Svein-Håkon Anker-Nilssen, Tycho Erikstad, Kjell E Røv, Nils |
author_facet |
Lorentsen, Svein-Håkon Anker-Nilssen, Tycho Erikstad, Kjell E Røv, Nils |
author_sort |
Lorentsen, Svein-Håkon |
title |
Forage fish abundance is a predictor of timing of breeding and hatching brood size in a coastal seabird |
title_short |
Forage fish abundance is a predictor of timing of breeding and hatching brood size in a coastal seabird |
title_full |
Forage fish abundance is a predictor of timing of breeding and hatching brood size in a coastal seabird |
title_fullStr |
Forage fish abundance is a predictor of timing of breeding and hatching brood size in a coastal seabird |
title_full_unstemmed |
Forage fish abundance is a predictor of timing of breeding and hatching brood size in a coastal seabird |
title_sort |
forage fish abundance is a predictor of timing of breeding and hatching brood size in a coastal seabird |
publishDate |
2015 |
url |
http://hdl.handle.net/11250/2396526 https://doi.org/10.3354/meps11100 |
op_coverage |
Norway, Norge, Sklinna, Røst |
long_lat |
ENVELOPE(11.983,11.983,67.467,67.467) ENVELOPE(11.000,11.000,65.200,65.200) |
geographic |
Norway Norwegian Sea Røst Sklinna |
geographic_facet |
Norway Norwegian Sea Røst Sklinna |
genre |
North Atlantic North Atlantic oscillation Norwegian Sea |
genre_facet |
North Atlantic North Atlantic oscillation Norwegian Sea |
op_source |
519 Marine Ecology Progress Series |
op_relation |
Norges forskningsråd Marine Ecology Progress Series 2015, 519:209-220 urn:issn:0171-8630 http://hdl.handle.net/11250/2396526 https://doi.org/10.3354/meps11100 cristin:1204710 |
op_rights |
Navngivelse 3.0 Norge http://creativecommons.org/licenses/by/3.0/no/ |
op_doi |
https://doi.org/10.3354/meps11100 |
container_title |
Marine Ecology Progress Series |
container_volume |
519 |
container_start_page |
209 |
op_container_end_page |
220 |
_version_ |
1802647745898479616 |