Deep-Sea Research I
Abstract Our objective was to understand how marine birds respond to oceanographic variability across the Southern Indian Ocean using data collected during an 16-day cruise (4-21 January 2003). We quantified concurrent water mass distributions, ocean productivity patterns, and seabird distributions...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.1084.9248 2023-05-15T13:59:47+02:00 Deep-Sea Research I K David Hyrenbach Richard R Veit Henri Weimerskirch Nicolas Metzl George L Hunt Jr K D Hyrenbach ) The Pennsylvania State University CiteSeerX Archives 2007 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1084.9248 http://www.pelagicos.net/MARS6300/readings/Hyrenbach_et_al._2007.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1084.9248 http://www.pelagicos.net/MARS6300/readings/Hyrenbach_et_al._2007.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.pelagicos.net/MARS6300/readings/Hyrenbach_et_al._2007.pdf text 2007 ftciteseerx 2020-05-03T00:31:28Z Abstract Our objective was to understand how marine birds respond to oceanographic variability across the Southern Indian Ocean using data collected during an 16-day cruise (4-21 January 2003). We quantified concurrent water mass distributions, ocean productivity patterns, and seabird distributions across a heterogeneous pelagic ecosystem from subtropical to sub-Antarctic waters. We surveyed 5155 km and sighted 15,606 birds from 51 species, and used these data to investigate how seabirds respond to spatial variability in the structure and productivity of the ocean. We addressed two spatial scales: the structure of seabird communities across macro-mega scale (1000 s km) biogeographic domains, and their coarse-scale (10 s km) aggregation at hydrographic and bathymetric gradients. Both seabird density and species composition changed with latitudinal and onshore-offshore gradients in depth, water temperature, and chlorophyll-a concentration. The average seabird density increased across the subtropical convergence (STC) from 2.4 birds km À2 in subtropical waters to 23.8 birds km À2 in sub-Antarctic waters. The composition of the avifauna also differed across biogeographic domains. Prions (Pachyptila spp.) accounted for 57% of all sub-Antarctic birds, wedge-tailed shearwaters (Puffinus pacificus) accounted for 46% of all subtropical birds, and Indian Ocean yellow-nosed albatross (Thallasarche carteri) accounted for 32% of all birds in the STC. While surface feeders were the most abundant foraging guild across the study area, divers were disproportionately more numerous in the sub-Antarctic domain, and plungers were disproportionately more abundant in subtropical waters. Seabird densities were also higher within shallow shelf-slope regions, especially in sub-Antarctic waters, where large numbers of breeding seabirds concentrated. However, we did not find elevated seabird densities along the STC, suggesting that this broad frontal region is not a site of enhanced aggregation. r Text Antarc* Antarctic Unknown Antarctic Indian |
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English |
description |
Abstract Our objective was to understand how marine birds respond to oceanographic variability across the Southern Indian Ocean using data collected during an 16-day cruise (4-21 January 2003). We quantified concurrent water mass distributions, ocean productivity patterns, and seabird distributions across a heterogeneous pelagic ecosystem from subtropical to sub-Antarctic waters. We surveyed 5155 km and sighted 15,606 birds from 51 species, and used these data to investigate how seabirds respond to spatial variability in the structure and productivity of the ocean. We addressed two spatial scales: the structure of seabird communities across macro-mega scale (1000 s km) biogeographic domains, and their coarse-scale (10 s km) aggregation at hydrographic and bathymetric gradients. Both seabird density and species composition changed with latitudinal and onshore-offshore gradients in depth, water temperature, and chlorophyll-a concentration. The average seabird density increased across the subtropical convergence (STC) from 2.4 birds km À2 in subtropical waters to 23.8 birds km À2 in sub-Antarctic waters. The composition of the avifauna also differed across biogeographic domains. Prions (Pachyptila spp.) accounted for 57% of all sub-Antarctic birds, wedge-tailed shearwaters (Puffinus pacificus) accounted for 46% of all subtropical birds, and Indian Ocean yellow-nosed albatross (Thallasarche carteri) accounted for 32% of all birds in the STC. While surface feeders were the most abundant foraging guild across the study area, divers were disproportionately more numerous in the sub-Antarctic domain, and plungers were disproportionately more abundant in subtropical waters. Seabird densities were also higher within shallow shelf-slope regions, especially in sub-Antarctic waters, where large numbers of breeding seabirds concentrated. However, we did not find elevated seabird densities along the STC, suggesting that this broad frontal region is not a site of enhanced aggregation. r |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
K David Hyrenbach Richard R Veit Henri Weimerskirch Nicolas Metzl George L Hunt Jr K D Hyrenbach ) |
spellingShingle |
K David Hyrenbach Richard R Veit Henri Weimerskirch Nicolas Metzl George L Hunt Jr K D Hyrenbach ) Deep-Sea Research I |
author_facet |
K David Hyrenbach Richard R Veit Henri Weimerskirch Nicolas Metzl George L Hunt Jr K D Hyrenbach ) |
author_sort |
K David Hyrenbach |
title |
Deep-Sea Research I |
title_short |
Deep-Sea Research I |
title_full |
Deep-Sea Research I |
title_fullStr |
Deep-Sea Research I |
title_full_unstemmed |
Deep-Sea Research I |
title_sort |
deep-sea research i |
publishDate |
2007 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1084.9248 http://www.pelagicos.net/MARS6300/readings/Hyrenbach_et_al._2007.pdf |
geographic |
Antarctic Indian |
geographic_facet |
Antarctic Indian |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
http://www.pelagicos.net/MARS6300/readings/Hyrenbach_et_al._2007.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1084.9248 http://www.pelagicos.net/MARS6300/readings/Hyrenbach_et_al._2007.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766268614077317120 |