Abundance estimation of franciscana dolphins by means of aerial surveys in Buenos Aires Province, Argentina, with comments on mortality rates

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Abundance estimation of franciscana dolphins by means of aerial surveys in Buenos Aires Province, Argentina, with comments on mortality rates

Crespo, Enrique Alberto et al · International Whaling Commisson · 2023

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Autor / responsable

Crespo, Enrique Alberto et al

Editorial

International Whaling Commisson

Año

2023

Idioma

eng

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Between October 11 and 16, 2019, and March 12 and 14, 2022, 9 flights were made on the coast of the province of Buenos Aires in meteorological conditions that allowed the sighting of several species of cetaceans. The two series of surveys (2019-2022) had to be carried out separately because of travel restrictions associated with the covid-19 pandemic. This document reports on results, including estimates of abundance, for franciscana dolphins (Pontoporia blainvillei). The number of sightings (and indviduals) in 2019 and 2022 were 41 (68 individuals) and 55 (80). Abundance for FMA IVb was estimated to be 8351,01, while FMA IVc was 2336,28. The total abundance of Franciscana for both areas would preliminary give a figure of 10687 dolphins if we consider the estimation obtained in 2022 plus 5896 dolphins estimated in 2004 for the southern areas, roughly 16600 individuals without considering those in deeper waters beyond the 30 meter isobath. In addition to franciscanas, several groups of common and dusky dolphins were observed during the aerial surveys, some very numerous.
Fil: Crespo, Enrique Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentina
Fil: Arias, Magdalena. Universidad Nacional del Comahue. Escuela de Ciencias Marinas; Argentina. Universidad Nacional del Comahue. Centro de Investigación Aplicada y Transferencia Tecnológica en Recursos Marinos "Almirante Storni". - Provincia de Río Negro. Ministerio de Agricultura, Ganadería y Pesca. Centro de Investigación Aplicada y Transferencia Tecnológica en Recursos Marinos "Almirante Storni". Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet Centro Nacional Patagónico. Centro de Investigación Aplicada y Transferencia Tecnológica en Recursos Marinos "Almirante Storni"; Argentina

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APA 7

Crespo, E. A. E. A. (2023). Abundance estimation of franciscana dolphins by means of aerial surveys in Buenos Aires Province, Argentina, with comments on mortality rates. International Whaling Commisson. http://hdl.handle.net/11336/249385

MLA

Crespo, Enrique Alberto et al. Abundance estimation of franciscana dolphins by means of aerial surveys in Buenos Aires Province, Argentina, with comments on mortality rates. International Whaling Commisson, 2023. http://hdl.handle.net/11336/249385.

Chicago

Crespo, Enrique Alberto et al. 2023. Abundance estimation of franciscana dolphins by means of aerial surveys in Buenos Aires Province, Argentina, with comments on mortality rates. International Whaling Commisson. http://hdl.handle.net/11336/249385.

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Crespo, E. A. E. A. 2023, Abundance estimation of franciscana dolphins by means of aerial surveys in Buenos Aires Province, Argentina, with comments on mortality rates, International Whaling Commisson, available at: http://hdl.handle.net/11336/249385 [Accessed 24 Jun. 2026].

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Título: Abundance estimation of franciscana dolphins by means of aerial surveys in Buenos Aires Province, Argentina, with comments on mortality rates

Autor / colaboradores: Crespo, Enrique Alberto et al

Editorial: International Whaling Commisson

Año de publicación: 2023

Idioma: eng

Materias

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FRANCISCANA DOLPHINS; AERIAL SURVEYS; ABUNDANCE; BUENOS AIRES PROVINCE; https://purl.org/becyt/ford/1.6; https://purl.org/becyt/ford/1