Dear MARMAM subscribers,


We are pleased to announce two new publications on common bottlenose dolphins in Brazilian waters:

 

1)      Milmann, L., Danilewicz, D., Machado, R., Santos, R.A. and Ott, P.H. (2016) Feeding ecology of the common bottlenose dolphin, Tursiops truncatus, in southern Brazil: analyzing its prey and the potential overlap with fisheries. Brazilian Journal of Oceanography, 64(4): 415-422. doi: 10.1590/s1679-87592016116406404

 

This article is full open access and available for download at the following link: https://dx.doi.org/10.1590/s1679-87592016116406404

 

 

2)     Milmann, L.C., Danilewicz, D., Baumgarten, J. and Ott, P.H. (2016) Temporal-spatial distribution of an island-based offshore population of common bottlenose dolphins (Tursiops truncatus) in the equatorial Atlantic. Marine Mammal Science. doi:10.1111/mms.12380

 


Abstract

 

A little-studied common bottlenose dolphin (Tursiops truncatus) population inhabits the offshore waters surrounding Saint Paul's Rocks, a Brazilian marine protected area in the equatorial Atlantic Ocean. Five field expeditions (May 2011–May 2013) were conducted to characterize the habitat use, population size, and site fidelity of this population. Three different survey methods were employed: line-transect surveys, land-based surveys, and photo-identification surveys. A population size of 23 individuals (19–28, CI 95%), which were present on most sampling days (>90% of surveys), was estimated. The maximum resighting interval of photo-identified animals was 9 yr and 3 mo for five distinct individuals, based on data from nonsystematic efforts that have been ongoing since 2004. The dolphins exhibited strong site fidelity, as the minimum convex polygon (MCP, 95%) method revealed that they restricted their movements to a 0.5 km2 area across seasons and a 0.99 km2 area across years (95% kernel). The dolphins preferred shallow waters close to the archipelago (<1.2 km from the islands), especially on the eastern and southeastern sides, where oceanographic models have revealed persistent upwelling that may result from underwater currents and where food may be more predictably available.

 

This article can be found at: http://onlinelibrary.wiley.com/wol1/doi/10.1111/mms.12380/full

 

Please don’t hesitate to contact me directly for any queries (lcmilmann@gmail.com)

 

Best wishes,

Lucas Milmann

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