Environmental niche overlap between common and dusky dolphins in North Patagonia, Argentina
Research on the ecology of sympatric dolphins has increased worldwide in recent decades. However, many dolphin associations such as that between common dolphins (Delphinus delphis) and dusky dolphins (Lagenorhynchus obscurus) are poorly understood. The present study was conducted in the San Matías G...
Guardado en:
| Autores principales: | , , , , , , |
|---|---|
| Formato: | JOUR |
| Materias: | |
| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_19326203_v10_n6_p_Svendsen |
| Aporte de: |
| id |
todo:paper_19326203_v10_n6_p_Svendsen |
|---|---|
| record_format |
dspace |
| spelling |
todo:paper_19326203_v10_n6_p_Svendsen2023-10-03T16:34:38Z Environmental niche overlap between common and dusky dolphins in North Patagonia, Argentina Svendsen, G.M. Romero, M.A. Williams, G.N. Gagliardini, D.A. Crespo, E.A. Dans, S.L. González, R.A. adult Argentina Article calf (mammal) cold climate common dolphin copulation Delphinus delphis dolphin ecological niche female habitat use Lagenorhynchus obscurus mother nonhuman oceanography population size sea surface temperature seasonal variation social behavior species comparison species composition species habitat animal biodiversity ecosystem environment toothed whale Delphinus delphis Lagenorhynchus obscurus Animals Argentina Biodiversity Dolphins Ecosystem Environment Research on the ecology of sympatric dolphins has increased worldwide in recent decades. However, many dolphin associations such as that between common dolphins (Delphinus delphis) and dusky dolphins (Lagenorhynchus obscurus) are poorly understood. The present study was conducted in the San Matías Gulf (SMG) ecosystem (North Patagonia, Argentina) where a high diet overlap among both species was found. The main objective of the present work was to explore the niche overlap of common and dusky dolphins in the habitat and temporal dimensions. The specific aims were (a) to evaluate the habitat use strategies of both species through a comparison of their group attributes (social composition, size and activity), and (b) to evaluate their habitat preferences and habitat overlap through Environmental Niche modeling considering two oceanographic seasons. To accomplish these aims, we used a historic database of opportunistic and systematic records collected from 1983 to 2011. Common and dusky dolphins exhibited similar patterns of group size (from less than 10 to more than 100 individuals), activity (both species use the area to feed, nurse, and copulate), and composition (adults, juveniles, and mothers with calves were observed for both species). Also, both species were observed travelling and feeding in mixed-species groups. Specific overlap indices were higher for common dolphins than for dusky dolphins, but all indices were low, suggesting that they are mainly segregated in the habitat dimension. In the case of common dolphins, the best habitats were located in the northwest of the gulf far from the coast. In the warm season they prefer areas with temperate sea surface and in the cold season they prefer areas with relatively high variability of sea surface temperature. Meanwhile, dusky dolphins prefer areas with steep slopes close to the coast in the southwestern sector of the gulf in both seasons. © 2015 Svendsen et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_19326203_v10_n6_p_Svendsen |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
adult Argentina Article calf (mammal) cold climate common dolphin copulation Delphinus delphis dolphin ecological niche female habitat use Lagenorhynchus obscurus mother nonhuman oceanography population size sea surface temperature seasonal variation social behavior species comparison species composition species habitat animal biodiversity ecosystem environment toothed whale Delphinus delphis Lagenorhynchus obscurus Animals Argentina Biodiversity Dolphins Ecosystem Environment |
| spellingShingle |
adult Argentina Article calf (mammal) cold climate common dolphin copulation Delphinus delphis dolphin ecological niche female habitat use Lagenorhynchus obscurus mother nonhuman oceanography population size sea surface temperature seasonal variation social behavior species comparison species composition species habitat animal biodiversity ecosystem environment toothed whale Delphinus delphis Lagenorhynchus obscurus Animals Argentina Biodiversity Dolphins Ecosystem Environment Svendsen, G.M. Romero, M.A. Williams, G.N. Gagliardini, D.A. Crespo, E.A. Dans, S.L. González, R.A. Environmental niche overlap between common and dusky dolphins in North Patagonia, Argentina |
| topic_facet |
adult Argentina Article calf (mammal) cold climate common dolphin copulation Delphinus delphis dolphin ecological niche female habitat use Lagenorhynchus obscurus mother nonhuman oceanography population size sea surface temperature seasonal variation social behavior species comparison species composition species habitat animal biodiversity ecosystem environment toothed whale Delphinus delphis Lagenorhynchus obscurus Animals Argentina Biodiversity Dolphins Ecosystem Environment |
| description |
Research on the ecology of sympatric dolphins has increased worldwide in recent decades. However, many dolphin associations such as that between common dolphins (Delphinus delphis) and dusky dolphins (Lagenorhynchus obscurus) are poorly understood. The present study was conducted in the San Matías Gulf (SMG) ecosystem (North Patagonia, Argentina) where a high diet overlap among both species was found. The main objective of the present work was to explore the niche overlap of common and dusky dolphins in the habitat and temporal dimensions. The specific aims were (a) to evaluate the habitat use strategies of both species through a comparison of their group attributes (social composition, size and activity), and (b) to evaluate their habitat preferences and habitat overlap through Environmental Niche modeling considering two oceanographic seasons. To accomplish these aims, we used a historic database of opportunistic and systematic records collected from 1983 to 2011. Common and dusky dolphins exhibited similar patterns of group size (from less than 10 to more than 100 individuals), activity (both species use the area to feed, nurse, and copulate), and composition (adults, juveniles, and mothers with calves were observed for both species). Also, both species were observed travelling and feeding in mixed-species groups. Specific overlap indices were higher for common dolphins than for dusky dolphins, but all indices were low, suggesting that they are mainly segregated in the habitat dimension. In the case of common dolphins, the best habitats were located in the northwest of the gulf far from the coast. In the warm season they prefer areas with temperate sea surface and in the cold season they prefer areas with relatively high variability of sea surface temperature. Meanwhile, dusky dolphins prefer areas with steep slopes close to the coast in the southwestern sector of the gulf in both seasons. © 2015 Svendsen et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. |
| format |
JOUR |
| author |
Svendsen, G.M. Romero, M.A. Williams, G.N. Gagliardini, D.A. Crespo, E.A. Dans, S.L. González, R.A. |
| author_facet |
Svendsen, G.M. Romero, M.A. Williams, G.N. Gagliardini, D.A. Crespo, E.A. Dans, S.L. González, R.A. |
| author_sort |
Svendsen, G.M. |
| title |
Environmental niche overlap between common and dusky dolphins in North Patagonia, Argentina |
| title_short |
Environmental niche overlap between common and dusky dolphins in North Patagonia, Argentina |
| title_full |
Environmental niche overlap between common and dusky dolphins in North Patagonia, Argentina |
| title_fullStr |
Environmental niche overlap between common and dusky dolphins in North Patagonia, Argentina |
| title_full_unstemmed |
Environmental niche overlap between common and dusky dolphins in North Patagonia, Argentina |
| title_sort |
environmental niche overlap between common and dusky dolphins in north patagonia, argentina |
| url |
http://hdl.handle.net/20.500.12110/paper_19326203_v10_n6_p_Svendsen |
| work_keys_str_mv |
AT svendsengm environmentalnicheoverlapbetweencommonandduskydolphinsinnorthpatagoniaargentina AT romeroma environmentalnicheoverlapbetweencommonandduskydolphinsinnorthpatagoniaargentina AT williamsgn environmentalnicheoverlapbetweencommonandduskydolphinsinnorthpatagoniaargentina AT gagliardinida environmentalnicheoverlapbetweencommonandduskydolphinsinnorthpatagoniaargentina AT crespoea environmentalnicheoverlapbetweencommonandduskydolphinsinnorthpatagoniaargentina AT danssl environmentalnicheoverlapbetweencommonandduskydolphinsinnorthpatagoniaargentina AT gonzalezra environmentalnicheoverlapbetweencommonandduskydolphinsinnorthpatagoniaargentina |
| _version_ |
1807315762068586496 |