Intra-specific isotope variations of franciscana dolphin Pontoporia blainvillei regarding biological parameters and distinct environments
The franciscana dolphin Pontoporia blainvillei is the most endangered small endemic cetacean species of the southwestern South Atlantic Ocean. We assessed intra-specific variation in the diet of franciscana regarding biological parameters (sex, total body length, age class and sexual maturity) and b...
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todo:paper_16165047_v85_n_p47_PasoViola2023-10-03T16:28:22Z Intra-specific isotope variations of franciscana dolphin Pontoporia blainvillei regarding biological parameters and distinct environments Paso Viola, M.N. Riccialdelli, L. Negri, M.F. Panebianco, M.V. Panarello, H.O. Cappozzo, H.L. Franciscana dolphin Pontoporia blainvillei Southwestern South Atlantic Ocean Trophic habits δ13C δ15N age class carbon isotope dolphin endangered species endemic species estimation method food consumption home range intraspecific variation isotopic analysis nitrogen isotope perciform stable isotope stomach content trophic conditions Argentina Atlantic Ocean Atlantic Ocean (South) Atlantic Ocean (Southwest) Buenos Aires [Argentina] Cetacea Cynoscion guatucupa Pontoporia blainvillei The franciscana dolphin Pontoporia blainvillei is the most endangered small endemic cetacean species of the southwestern South Atlantic Ocean. We assessed intra-specific variation in the diet of franciscana regarding biological parameters (sex, total body length, age class and sexual maturity) and between distinct environments (open marine area vs. an area adjacent to an estuary) from the Buenos Aires coast, Argentina, using both stable isotopes and stomach content analysis. We found a significant isotopic enrichment in 15N in neonates and nursing calves, representative of the lactation period. We found differences in the diet of franciscana between dolphins from the open marine area and dolphins living in waters influenced by the estuary, by both diet estimating methods. The lower δ15N values in dolphins living in waters adjacent to the estuary could be associated with a higher consumption of small sizes of the striped weakfish (Cynoscion guatucupa), which has lower isotope values than the larger sizes consumed in the open marine area. This trophic differentiation between locations is in agreement with the existence of two genetically distinct populations recently found in the study area. This study reveals geographical variations in the diet of franciscana dolphin, supporting the new delineation of distinct franciscana populations in Argentine waters. Considering the small home range and the limited movement pattern of the species, the population living near the estuary would likely need protection due to its low level of genetic diversity and feeding preferences. Therefore, the preservation and conservation of the mentioned habitat is recommended to ensure population viability of franciscana in the region. © 2017 Deutsche Gesellschaft für Säugetierkunde JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_16165047_v85_n_p47_PasoViola |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Franciscana dolphin Pontoporia blainvillei Southwestern South Atlantic Ocean Trophic habits δ13C δ15N age class carbon isotope dolphin endangered species endemic species estimation method food consumption home range intraspecific variation isotopic analysis nitrogen isotope perciform stable isotope stomach content trophic conditions Argentina Atlantic Ocean Atlantic Ocean (South) Atlantic Ocean (Southwest) Buenos Aires [Argentina] Cetacea Cynoscion guatucupa Pontoporia blainvillei |
| spellingShingle |
Franciscana dolphin Pontoporia blainvillei Southwestern South Atlantic Ocean Trophic habits δ13C δ15N age class carbon isotope dolphin endangered species endemic species estimation method food consumption home range intraspecific variation isotopic analysis nitrogen isotope perciform stable isotope stomach content trophic conditions Argentina Atlantic Ocean Atlantic Ocean (South) Atlantic Ocean (Southwest) Buenos Aires [Argentina] Cetacea Cynoscion guatucupa Pontoporia blainvillei Paso Viola, M.N. Riccialdelli, L. Negri, M.F. Panebianco, M.V. Panarello, H.O. Cappozzo, H.L. Intra-specific isotope variations of franciscana dolphin Pontoporia blainvillei regarding biological parameters and distinct environments |
| topic_facet |
Franciscana dolphin Pontoporia blainvillei Southwestern South Atlantic Ocean Trophic habits δ13C δ15N age class carbon isotope dolphin endangered species endemic species estimation method food consumption home range intraspecific variation isotopic analysis nitrogen isotope perciform stable isotope stomach content trophic conditions Argentina Atlantic Ocean Atlantic Ocean (South) Atlantic Ocean (Southwest) Buenos Aires [Argentina] Cetacea Cynoscion guatucupa Pontoporia blainvillei |
| description |
The franciscana dolphin Pontoporia blainvillei is the most endangered small endemic cetacean species of the southwestern South Atlantic Ocean. We assessed intra-specific variation in the diet of franciscana regarding biological parameters (sex, total body length, age class and sexual maturity) and between distinct environments (open marine area vs. an area adjacent to an estuary) from the Buenos Aires coast, Argentina, using both stable isotopes and stomach content analysis. We found a significant isotopic enrichment in 15N in neonates and nursing calves, representative of the lactation period. We found differences in the diet of franciscana between dolphins from the open marine area and dolphins living in waters influenced by the estuary, by both diet estimating methods. The lower δ15N values in dolphins living in waters adjacent to the estuary could be associated with a higher consumption of small sizes of the striped weakfish (Cynoscion guatucupa), which has lower isotope values than the larger sizes consumed in the open marine area. This trophic differentiation between locations is in agreement with the existence of two genetically distinct populations recently found in the study area. This study reveals geographical variations in the diet of franciscana dolphin, supporting the new delineation of distinct franciscana populations in Argentine waters. Considering the small home range and the limited movement pattern of the species, the population living near the estuary would likely need protection due to its low level of genetic diversity and feeding preferences. Therefore, the preservation and conservation of the mentioned habitat is recommended to ensure population viability of franciscana in the region. © 2017 Deutsche Gesellschaft für Säugetierkunde |
| format |
JOUR |
| author |
Paso Viola, M.N. Riccialdelli, L. Negri, M.F. Panebianco, M.V. Panarello, H.O. Cappozzo, H.L. |
| author_facet |
Paso Viola, M.N. Riccialdelli, L. Negri, M.F. Panebianco, M.V. Panarello, H.O. Cappozzo, H.L. |
| author_sort |
Paso Viola, M.N. |
| title |
Intra-specific isotope variations of franciscana dolphin Pontoporia blainvillei regarding biological parameters and distinct environments |
| title_short |
Intra-specific isotope variations of franciscana dolphin Pontoporia blainvillei regarding biological parameters and distinct environments |
| title_full |
Intra-specific isotope variations of franciscana dolphin Pontoporia blainvillei regarding biological parameters and distinct environments |
| title_fullStr |
Intra-specific isotope variations of franciscana dolphin Pontoporia blainvillei regarding biological parameters and distinct environments |
| title_full_unstemmed |
Intra-specific isotope variations of franciscana dolphin Pontoporia blainvillei regarding biological parameters and distinct environments |
| title_sort |
intra-specific isotope variations of franciscana dolphin pontoporia blainvillei regarding biological parameters and distinct environments |
| url |
http://hdl.handle.net/20.500.12110/paper_16165047_v85_n_p47_PasoViola |
| work_keys_str_mv |
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| _version_ |
1807317150567759872 |