[MARMAM] New publication: Individual home ranges of Tursiops truncatus and their overlap with ranges of Stenella frontalis and fishermen in Aragua, Venezuela, South Caribbean (Sergio Cobarrubia-Russo).
sergio.cobarrubia at gmail.com
Wed Jul 8 11:46:37 PDT 2020
We are pleased to announce our new publication:
Cobarrubia-Russo SE, Barreto-Esnal GR, Molero-Lizarraga AE, Mariani-Di Lena
MA (2020). Individual home ranges of Tursiops truncatus and their overlap
with ranges of Stenella frontalis and fishermen in Aragua, Venezuela, South
Caribbean. Journal of the Marine Biological Association of the United
Kingdom 1–10. https://doi.org/ 10.1017/S0025315420000557
The coast of Aragua is a home of bottlenose dolphins (BND), Atlantic
spotted dolphins (ASD) and fishermen (FIS) from four towns. A
photo-identification study was carried out on BND to estimate their home
ranges. From 2004 to 2008, 100 field surveys were carried out along 30 km
of coastline (92.12 km2 ). In each sighting of BND, information regarding
date, time, latitude/longitude and photographs were registered (ASD and FIS
were registered without photography). The data were analysed using a
Geographic Information System to estimate Minimum Convex Polygon (MCP) and
Fixed Kernel (FK) at 95%. The home ranges of BND were estimated for seven
individuals. This included three females (29–31 sightings) with estimated
areas ranging from 33.90–39.90 km2 with MCP (36.79–43.31% of the study
area) and from 80.47–101.31 km2 with FK (109.97–104.26%). For the remaining
four dolphins (14–20 sightings) the estimated areas ranged from 9.67–22.34
km2 (MCP), the predominant depth of these home ranges varied from 51–100 m
(χ2 = 24.5, df = 2, P = 4.785 × 10−6 ). For the pods of ASD the estimated
area ranged 75.23 km2 with MCP (81.66%) and 119.86 km2 with FK (130.11%)
with predominant depths of 101–200 m (χ2 = 24.5, df = 2, P = 4.785 × 10−6
). The area used by FIS ranged 93.27 km2 by MCP and 228.49 km2 by FK.
Finally, the overlap area of BND, ASD and FIS ranged 24.75 km2 (26.86%). We
point out this locality presents important oceanographic and ecological
aspects which deserve to be the subject of application of management plans
for the conservation of its habitat and species.
A pdf copy can be requested at the following email:
sergio.cobarrubia at gmail.com.
*Sergio Enrique Cobarrubia Russo*
Laboratorio de Ecosistemas y Cambio Global
Centro de Ecología
Instituto Venezolano de Investigaciones Científicas
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