Dear colleagues, We are pleased to announce the publication of the following paper: Dinis, A., A. Carvalho, F. Alves, C. Nicolau, C. Ribeiro, M. Kaufmann, A. Cañadas & L. Freitas 2016. Spatial and temporal distribution of bottlenose dolphins, Tursiops truncatus, in the Madeira archipelago, NE Atlantic. Arquipelago. Life and Marine Sciences 33: 45-54. ABSTRACTOne of the first steps in understanding the relationships between populations and their habitats is to determine which areas they use with higher frequency. This study used systematic and non-systematic survey data from 2001-2002 and 2004-2012 to determine encounter rates and investigate temporal and spatial distribution of bottlenose dolphins around Madeira, Desertas and Porto Santo islands. A total 24,914 km of search effort was carried out and 199 sightings were recorded. Highest encounter rates were found off the east coast of Madeira and off Porto Santo. Moreover, higher encounter rates occurred over bathymetries ranging between 500-1,000 m during systematic surveys whereas in non-systematic surveys relative high encounter rates were found in depths of 2,000-2,500m. Most dolphins were found to be distributed in depths <1,000m and at no more than 10 km offshore indicating a preference for shallower waters. Dolphins were sighted during the whole year and there were no significant differences in encounter rate between months. These results suggest the existence of preferential areas for this species based on static bathymetric features. The fact that the dolphins prefer inshore areas that are more exposed to anthropogenic activities should be taken into account when discussing bottlenose dolphin conservation measures in the Madeira archipelago.
You can access the paper here: www.arquipelago.info or you can send an email request to: [email protected] Cheers, Ana Dinis, PhD CIIMAR-Madeira, ARDITI-OOM Phone: +351 291 721 216 http://home.ciimarmadeira.org/index.php?page=anadinis
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