[MARMAM] New article - Abundance and demographic parameters of bottlenose dolphins in a highly affected coastal ecosystem

Bruno Diaz Lopez bruno at thebdri.com
Mon Jun 4 03:25:54 PDT 2018

We are delighted to bring to your attention the publication of our last scientific article published in Marine and Freshwater Research. 

Methion, S. & Diaz Lopez, B. (2018) Abundance and demographic parameters of bottlenose dolphins in a highly affected coastal ecosystem. Marine and Freshwater Research. DOI: https://doi.org/10.1071/MF17346 

Abstract: This study presents the first robust estimates of abundance and demographic parameters of common bottlenose dolphins (Tursiops truncatus) in a highly affected coastal ecosystem along the north-eastern Atlantic. Seasonal abundance, apparent survival and temporary emigration rates were estimated using Pollock’s robust design models. Photographic identification data were collected from 2014 to 2016 along the north-western Iberian coast (Spain). Bottlenose dolphins were present year-round and with a high degree of occurrence in the study area, which is highly affected by human activity but is also a highly productive coastal ecosystem. Local abundance of bottlenose dolphins ranged from 56 in autumn 2014 to 144 in winter 2015. Apparent survival rate was high and constant, indicating no mortality and no permanent emigration. Temporal emigration rates varied seasonally and were lower from autumn to winter, suggesting that dolphins had a high probability of returning during the winter period. The observed changes inabundance and emigration rates most likely reflect seasonal fluctuations in abundance of prey species in this area. These results provide important baseline information in an area subject to significant anthropogenic pressures and for future comparisons with other populations of similar characteristics under the pressure of human activities, such as fisheries and aquaculture. 

If you cannot download the publication, you can request a pdf by emailing to: bruno at thebdri.com or severine at thebdri.com 

Please feel free to contact us for any question regarding the study, 

Best regards,

 Bruno Diaz Lopez Ph.D
Chief biologist and Director

The Bottlenose Dolphin Research Institute BDRI
Avenida Beiramar 192, O Grove 36980, Pontevedra, Spain
0034 684248552
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