Foraging niche overlap during chick-rearing in the sexually dimorphic Westland petrel
Most Procellariform seabirds are pelagic, breed in summer when prey availability peaks, and migrate for winter. They also display a dual foraging strategy (short and long trips) and sex-specific foraging. The Westland petrel Procellaria westlandica, a New Zealand endemic, is one of the rare seabirds...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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The Royal Society
2020-11-01
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| Series: | Royal Society Open Science |
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| Online Access: | https://royalsocietypublishing.org/doi/pdf/10.1098/rsos.191511 |
| _version_ | 1818389019092844544 |
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| author | Timothée A. Poupart Susan M. Waugh Akiko Kato John P. Y. Arnould |
| author_facet | Timothée A. Poupart Susan M. Waugh Akiko Kato John P. Y. Arnould |
| author_sort | Timothée A. Poupart |
| collection | DOAJ |
| description | Most Procellariform seabirds are pelagic, breed in summer when prey availability peaks, and migrate for winter. They also display a dual foraging strategy (short and long trips) and sex-specific foraging. The Westland petrel Procellaria westlandica, a New Zealand endemic, is one of the rare seabirds breeding in winter. Preliminary findings on this large and sexually dimorphic petrel suggest a foraging behaviour with no evidence of a dual strategy, within a narrow range and with shared areas between sexes. To investigate further this unusual strategy, the present study determined the fine-scale at-sea behaviours (global positioning system and accelerometer data loggers) and trophic niches (stable isotopes in whole blood) of chick-rearing individuals (16 males and 13 females). All individuals foraged on the shelf-slope of the west coast of New Zealand's South Island with short, unimodal trips. Both sexes foraged at similar intensity without temporal, spatial or isotopic niche segregation. These findings suggest the presence of a winter prey resource close to the colony, sufficient to satisfy the nutritional needs of breeding without increasing the foraging effort or intra-specific competition avoidance during winter. Additional data are needed to assess the consistency of foraging niche between the sexes and its reproductive outcomes in view of anticipated environmental changes. |
| first_indexed | 2024-12-14T04:35:04Z |
| format | Article |
| id | doaj.art-db8522597f694299badf444c1b1b1924 |
| institution | Directory Open Access Journal |
| issn | 2054-5703 |
| language | English |
| last_indexed | 2024-12-14T04:35:04Z |
| publishDate | 2020-11-01 |
| publisher | The Royal Society |
| record_format | Article |
| series | Royal Society Open Science |
| spelling | doaj.art-db8522597f694299badf444c1b1b19242022-12-21T23:16:59ZengThe Royal SocietyRoyal Society Open Science2054-57032020-11-0171110.1098/rsos.191511191511Foraging niche overlap during chick-rearing in the sexually dimorphic Westland petrelTimothée A. PoupartSusan M. WaughAkiko KatoJohn P. Y. ArnouldMost Procellariform seabirds are pelagic, breed in summer when prey availability peaks, and migrate for winter. They also display a dual foraging strategy (short and long trips) and sex-specific foraging. The Westland petrel Procellaria westlandica, a New Zealand endemic, is one of the rare seabirds breeding in winter. Preliminary findings on this large and sexually dimorphic petrel suggest a foraging behaviour with no evidence of a dual strategy, within a narrow range and with shared areas between sexes. To investigate further this unusual strategy, the present study determined the fine-scale at-sea behaviours (global positioning system and accelerometer data loggers) and trophic niches (stable isotopes in whole blood) of chick-rearing individuals (16 males and 13 females). All individuals foraged on the shelf-slope of the west coast of New Zealand's South Island with short, unimodal trips. Both sexes foraged at similar intensity without temporal, spatial or isotopic niche segregation. These findings suggest the presence of a winter prey resource close to the colony, sufficient to satisfy the nutritional needs of breeding without increasing the foraging effort or intra-specific competition avoidance during winter. Additional data are needed to assess the consistency of foraging niche between the sexes and its reproductive outcomes in view of anticipated environmental changes.https://royalsocietypublishing.org/doi/pdf/10.1098/rsos.191511foraging behavioursexual dimorphismniche segregationwestland petrelnew zealand |
| spellingShingle | Timothée A. Poupart Susan M. Waugh Akiko Kato John P. Y. Arnould Foraging niche overlap during chick-rearing in the sexually dimorphic Westland petrel Royal Society Open Science foraging behaviour sexual dimorphism niche segregation westland petrel new zealand |
| title | Foraging niche overlap during chick-rearing in the sexually dimorphic Westland petrel |
| title_full | Foraging niche overlap during chick-rearing in the sexually dimorphic Westland petrel |
| title_fullStr | Foraging niche overlap during chick-rearing in the sexually dimorphic Westland petrel |
| title_full_unstemmed | Foraging niche overlap during chick-rearing in the sexually dimorphic Westland petrel |
| title_short | Foraging niche overlap during chick-rearing in the sexually dimorphic Westland petrel |
| title_sort | foraging niche overlap during chick rearing in the sexually dimorphic westland petrel |
| topic | foraging behaviour sexual dimorphism niche segregation westland petrel new zealand |
| url | https://royalsocietypublishing.org/doi/pdf/10.1098/rsos.191511 |
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