Data from: Multidimensional stable isotope analysis illuminates resource partitioning in a sub-Antarctic island bird community
1. A central theme in community ecology is understanding how similar species co-exist and how their interactions may evolve in the context of climate change. Most studies of resource partitioning among central place foragers, particularly birds, focus on the offspring-rearing period, when they are a...
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ftdryad:oai:v1.datadryad.org:10255/dryad.227170 2023-05-15T14:04:12+02:00 Data from: Multidimensional stable isotope analysis illuminates resource partitioning in a sub-Antarctic island bird community Connan, Maelle Dilley, Ben Whitehead, Thomas Davies, Delia McQuaid, Christopher Ryan, Peter Southern Ocean Prince Edward Islands 2019-08-23T18:20:17Z http://hdl.handle.net/10255/dryad.227170 https://doi.org/10.5061/dryad.2m0sr43 unknown doi:10.5061/dryad.2m0sr43/1 doi:10.1111/ecog.04560 doi:10.5061/dryad.2m0sr43 http://hdl.handle.net/10255/dryad.227170 Carbon stable isotopes Nitrogen stable isotopes Oxygen stable isotopes Egg shells Egg membranes Article 2019 ftdryad https://doi.org/10.5061/dryad.2m0sr43 https://doi.org/10.5061/dryad.2m0sr43/1 https://doi.org/10.1111/ecog.04560 2020-01-01T16:34:16Z 1. A central theme in community ecology is understanding how similar species co-exist and how their interactions may evolve in the context of climate change. Most studies of resource partitioning among central place foragers, particularly birds, focus on the offspring-rearing period, when they are accessible, but breeding success may be determined earlier and little is known about how such species partition resources at the onset of breeding. 2. We used a non-invasive approach to evaluate resource partitioning in co-existing females at a sub-Antarctic island during their pre-laying periods. 3. Three hypotheses were tested using carbon, nitrogen and oxygen stable isotope ratios measured in shells and membranes of hatched eggs as ecological tracers: 1) resource partitioning by geographic location and trophic level will exist among the 12 bird species and will be enhanced within taxonomic groups; 2) given the absence of strong oxygen gradients in the Southern Ocean we will not detect spatial structuring based on oxygen isotopes, but differences will exist between resident and oceanic species as the former may use meteoric water; 3) capital and income breeder strategies can be differentiated using stable isotopes of egg remains. 4. Two and three dimensional isotopic data showed resource partitioning among species. As predicted, segregation was evident within the four main taxonomic groups: penguins, albatrosses, burrowing petrels and giant petrels. Unexpectedly, oxygen isotopes revealed widespread use of meteoric water among a suite of sub-Antarctic birds. Stable isotopes allowed us to identify females of most species as income breeders at the onset of breeding, with the exception of the two crested penguin females exhibiting a mix of income and capital resources use. 5. Multidimensional isotopic analyses revealed that resource partitioning exists at multiple stages of the annual cycle in ways likely to be important under global change, exhibiting wide potential for ecosystem analysis. Article in Journal/Newspaper Antarc* Antarctic Giant Petrels Prince Edward Islands Southern Ocean Dryad Digital Repository (Duke University) Antarctic Southern Ocean |
institution |
Open Polar |
collection |
Dryad Digital Repository (Duke University) |
op_collection_id |
ftdryad |
language |
unknown |
topic |
Carbon stable isotopes Nitrogen stable isotopes Oxygen stable isotopes Egg shells Egg membranes |
spellingShingle |
Carbon stable isotopes Nitrogen stable isotopes Oxygen stable isotopes Egg shells Egg membranes Connan, Maelle Dilley, Ben Whitehead, Thomas Davies, Delia McQuaid, Christopher Ryan, Peter Data from: Multidimensional stable isotope analysis illuminates resource partitioning in a sub-Antarctic island bird community |
topic_facet |
Carbon stable isotopes Nitrogen stable isotopes Oxygen stable isotopes Egg shells Egg membranes |
description |
1. A central theme in community ecology is understanding how similar species co-exist and how their interactions may evolve in the context of climate change. Most studies of resource partitioning among central place foragers, particularly birds, focus on the offspring-rearing period, when they are accessible, but breeding success may be determined earlier and little is known about how such species partition resources at the onset of breeding. 2. We used a non-invasive approach to evaluate resource partitioning in co-existing females at a sub-Antarctic island during their pre-laying periods. 3. Three hypotheses were tested using carbon, nitrogen and oxygen stable isotope ratios measured in shells and membranes of hatched eggs as ecological tracers: 1) resource partitioning by geographic location and trophic level will exist among the 12 bird species and will be enhanced within taxonomic groups; 2) given the absence of strong oxygen gradients in the Southern Ocean we will not detect spatial structuring based on oxygen isotopes, but differences will exist between resident and oceanic species as the former may use meteoric water; 3) capital and income breeder strategies can be differentiated using stable isotopes of egg remains. 4. Two and three dimensional isotopic data showed resource partitioning among species. As predicted, segregation was evident within the four main taxonomic groups: penguins, albatrosses, burrowing petrels and giant petrels. Unexpectedly, oxygen isotopes revealed widespread use of meteoric water among a suite of sub-Antarctic birds. Stable isotopes allowed us to identify females of most species as income breeders at the onset of breeding, with the exception of the two crested penguin females exhibiting a mix of income and capital resources use. 5. Multidimensional isotopic analyses revealed that resource partitioning exists at multiple stages of the annual cycle in ways likely to be important under global change, exhibiting wide potential for ecosystem analysis. |
format |
Article in Journal/Newspaper |
author |
Connan, Maelle Dilley, Ben Whitehead, Thomas Davies, Delia McQuaid, Christopher Ryan, Peter |
author_facet |
Connan, Maelle Dilley, Ben Whitehead, Thomas Davies, Delia McQuaid, Christopher Ryan, Peter |
author_sort |
Connan, Maelle |
title |
Data from: Multidimensional stable isotope analysis illuminates resource partitioning in a sub-Antarctic island bird community |
title_short |
Data from: Multidimensional stable isotope analysis illuminates resource partitioning in a sub-Antarctic island bird community |
title_full |
Data from: Multidimensional stable isotope analysis illuminates resource partitioning in a sub-Antarctic island bird community |
title_fullStr |
Data from: Multidimensional stable isotope analysis illuminates resource partitioning in a sub-Antarctic island bird community |
title_full_unstemmed |
Data from: Multidimensional stable isotope analysis illuminates resource partitioning in a sub-Antarctic island bird community |
title_sort |
data from: multidimensional stable isotope analysis illuminates resource partitioning in a sub-antarctic island bird community |
publishDate |
2019 |
url |
http://hdl.handle.net/10255/dryad.227170 https://doi.org/10.5061/dryad.2m0sr43 |
op_coverage |
Southern Ocean Prince Edward Islands |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic Giant Petrels Prince Edward Islands Southern Ocean |
genre_facet |
Antarc* Antarctic Giant Petrels Prince Edward Islands Southern Ocean |
op_relation |
doi:10.5061/dryad.2m0sr43/1 doi:10.1111/ecog.04560 doi:10.5061/dryad.2m0sr43 http://hdl.handle.net/10255/dryad.227170 |
op_doi |
https://doi.org/10.5061/dryad.2m0sr43 https://doi.org/10.5061/dryad.2m0sr43/1 https://doi.org/10.1111/ecog.04560 |
_version_ |
1766275228660400128 |