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Artículo

Abundance and distribution of endangered Franciscana dolphins in Argentine waters and conservation implications

Crespo, Enrique AlbertoIcon ; Pedraza, Susana NoemiIcon ; Grandi, Maria FlorenciaIcon ; Dans, Silvana LauraIcon ; Garaffo, Griselda ValeriaIcon
Fecha de publicación: 01/2010
Editorial: Wiley Blackwell Publishing, Inc
Revista: Marine Mammal Science
ISSN: 0824-0469
e-ISSN: 1748-7692
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Otras Ciencias Biológicas

Resumen

This is the first study in Argentine waters on the abundance of the threatened Franciscana dolphin, Pontoporia blainvillei. During 2003-2004 we carried out 17 aerial surveys using line transect sampling methodology. We observed 101 Franciscanas in 71 sightings. In northern areas density was estimated at 0.106 individual/km2. Density was lower in southern areas (0.055/km2) and declined with depth beyond 30-m isobaths (0.05/km2). A correction factor for submerged dolphins was applied to density and then extrapolated to the strip between the coastline and the 30-m isobath. Abundance in the northern area was estimated at 8,279 (4,904-13,960) individuals, while in the southern area it was estimated at 5,896 (1,928-17,999) individuals. Considering an annual mortality of about 500-800 individuals, about 3.5%-5.6% of the stock may be removed each year by the fishery and over the 2% recommended by the International Whaling Commission (IWC) and may not be sustainable by the population. Higher densities in coastal areas make Franciscanas more vulnerable to coastal fishing camps, which increased mortality in recent years. A remarkable finding was that while density decreases to the south, values of catch per unit effort (CPUE) increases, indicating different catchability of dolphins between areas. © 2009 by the Society for Marine Mammalogy.
Palabras clave: Abundance Estimations , Aerial Surveys , Conservation , Franciscana (Pontoporia Blainvillei) , Western South Atlantic
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/63164
DOI: http://dx.doi.org/10.1111/j.1748-7692.2009.00313.x
Colecciones
Articulos(CCT - MAR DEL PLATA)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - MAR DEL PLATA
Articulos(CCT-CENPAT)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - CENPAT
Citación
Crespo, Enrique Alberto; Pedraza, Susana Noemi; Grandi, Maria Florencia; Dans, Silvana Laura; Garaffo, Griselda Valeria; Abundance and distribution of endangered Franciscana dolphins in Argentine waters and conservation implications; Wiley Blackwell Publishing, Inc; Marine Mammal Science; 26; 1; 1-2010; 17-35
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