Isotopic niche partitioning between two apex predators over time
1. Stable isotope analyses have become an important tool in reconstructing diets, analyzing resource use patterns, elucidating trophic relations among predators and understanding the structure of food webs.<br />2. Here, we use stable carbon and nitrogen isotope ratios in bone collagen to reco...
Guardado en:
| Autores principales: | , , , , , , , , |
|---|---|
| Formato: | Artículo publishedVersion |
| Lenguaje: | Inglés |
| Publicado: |
Wiley Blackwell Publishing, Inc
2017
|
| Materias: | |
| Acceso en línea: | http://hdl.handle.net/11336/43496 http://suquia.ffyh.unc.edu.ar/handle/11336/43496 |
| Aporte de: |
| id |
I10-R181-11336-43496 |
|---|---|
| record_format |
dspace |
| institution |
Universidad Nacional de Córdoba |
| institution_str |
I-10 |
| repository_str |
R-181 |
| collection |
Suquía - Instituto de Antropología de Córdoba (IDACOR, CONICET y UNC) |
| language |
Inglés |
| topic |
MARINE MAMMALS PINNIPEDS STABLE ISOTOPES STANDARD ELLIPSE AREA TROPHIC ECOLOGY Otras Ciencias Biológicas Ciencias Biológicas CIENCIAS NATURALES Y EXACTAS |
| spellingShingle |
MARINE MAMMALS PINNIPEDS STABLE ISOTOPES STANDARD ELLIPSE AREA TROPHIC ECOLOGY Otras Ciencias Biológicas Ciencias Biológicas CIENCIAS NATURALES Y EXACTAS Drago, Massimiliano Cardona, Luis Franco Trecu, Valentina Crespo, Enrique Alberto Vales, Damián Gustavo Borella, Florencia Zenteno, Lisette Gonzáles, Enrique M. Inchausti, Pablo Isotopic niche partitioning between two apex predators over time |
| topic_facet |
MARINE MAMMALS PINNIPEDS STABLE ISOTOPES STANDARD ELLIPSE AREA TROPHIC ECOLOGY Otras Ciencias Biológicas Ciencias Biológicas CIENCIAS NATURALES Y EXACTAS |
| description |
1. Stable isotope analyses have become an important tool in reconstructing diets, analyzing resource use patterns, elucidating trophic relations among predators and understanding the structure of food webs.<br />2. Here, we use stable carbon and nitrogen isotope ratios in bone collagen to reconstruct and compare the isotopic niches of adult South American fur seals (Arctocephalus australis; n = 86) and sea lions (Otaria flavescens; n = 49) ?two otariid species with marked morphological differences? in the Río de la Plata estuary (Argentina - Uruguay) and the adjacent Atlantic Ocean during the second half of the 20th century and the beginning of the 21st century. Samples from the middle Holocene (n = 7 fur seals and n = 5 sea lions) are also included in order to provide a reference point for characterizing resource partitioning before major anthropogenic modifications of the environment.<br />3. We found that the South American fur seals and South American sea lions had distinct isotopic niches during the middle Holocene. Isotopic niche segregation was similar at the beginning of the second half of the 20th century, but has diminished over time.<br />4. The progressive convergence of the isotopic niches of these two otariids during the second half of the 20th century and the beginning of the 21st century is most likely due to the increased reliance of South American fur seals on demersal prey.<br />5. This recent dietary change of South American fur seals can be explained by at least two non-mutually exclusive mechanisms: (i) the decrease in the abundance of sympatric South American sea lions as a consequence of small colony size and high pup mortality resulting from commercial sealing; and (ii) the decrease in the average size of demersal fishes due to intense fishing of the larger class sizes, which may have increased their accessibility to those eared seals with a smaller mouth gape, i.e., South American fur seals of both sexes and female South American sea lions. |
| format |
Artículo Artículo publishedVersion |
| author |
Drago, Massimiliano Cardona, Luis Franco Trecu, Valentina Crespo, Enrique Alberto Vales, Damián Gustavo Borella, Florencia Zenteno, Lisette Gonzáles, Enrique M. Inchausti, Pablo |
| author_facet |
Drago, Massimiliano Cardona, Luis Franco Trecu, Valentina Crespo, Enrique Alberto Vales, Damián Gustavo Borella, Florencia Zenteno, Lisette Gonzáles, Enrique M. Inchausti, Pablo |
| author_sort |
Drago, Massimiliano |
| title |
Isotopic niche partitioning between two apex predators over time |
| title_short |
Isotopic niche partitioning between two apex predators over time |
| title_full |
Isotopic niche partitioning between two apex predators over time |
| title_fullStr |
Isotopic niche partitioning between two apex predators over time |
| title_full_unstemmed |
Isotopic niche partitioning between two apex predators over time |
| title_sort |
isotopic niche partitioning between two apex predators over time |
| publisher |
Wiley Blackwell Publishing, Inc |
| publishDate |
2017 |
| url |
http://hdl.handle.net/11336/43496 http://suquia.ffyh.unc.edu.ar/handle/11336/43496 |
| work_keys_str_mv |
AT dragomassimiliano isotopicnichepartitioningbetweentwoapexpredatorsovertime AT cardonaluis isotopicnichepartitioningbetweentwoapexpredatorsovertime AT francotrecuvalentina isotopicnichepartitioningbetweentwoapexpredatorsovertime AT crespoenriquealberto isotopicnichepartitioningbetweentwoapexpredatorsovertime AT valesdamiangustavo isotopicnichepartitioningbetweentwoapexpredatorsovertime AT borellaflorencia isotopicnichepartitioningbetweentwoapexpredatorsovertime AT zentenolisette isotopicnichepartitioningbetweentwoapexpredatorsovertime AT gonzalesenriquem isotopicnichepartitioningbetweentwoapexpredatorsovertime AT inchaustipablo isotopicnichepartitioningbetweentwoapexpredatorsovertime |
| bdutipo_str |
Repositorios |
| _version_ |
1764820397957578752 |