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Environment and anthropogenic activities influence cetacean habitat use in southeastern Brazil
Rodrigo H. Tardin, Yongwan Chun, Clinton N. Jenkins, Israel S. Maciel, Sheila M. Simão, Maria Alice S. Alves. Environment and anthropogenic activities influence cetacean habitat use in southeastern Brazil. Marine Ecology Progress Series. Vol. 616 (10): 197–210. 2019.

Investigating the influence of coastal development on marine environments is a pri?ority to maintain healthy seas. Cetaceans are top predators, keystone and umbrella species and thus are good candidate models to evaluate the extent of anthropogenic impacts on coastal habi?tats. We employed a generalized linear model with spatial eigenvector mapping (SEV-GLM) to understand the influence of environmental and anthropogenic activities on migrant (humpback whale Megaptera novaeangliae) and non-migrant (Bryde’s whale Balaenoptera brydei and com?mon bottlenose dolphin Tursiops truncatus) cetacean habitat use off Cabo Frio, Rio de Janeiro, Brazil. We hypothesized that both environmental and anthropogenic activities influence their habitat use. Data were collected during 118 boat trips between December 2010 and June 2014. The best SEV-GLM predicted humpback whales would increase linearly with distance to coast, with minimum sea surface temperature (SST) around 19.4?19.8°C and maximum SST around 25.5?26°C, with low variations in chlorophyll a (chl a) concentrations. The model also predicted that humpback whales would occur up to 10 km from diving areas, increasing linearly with dis?tance to fishing grounds. The best non-migrant cetacean SEV-GLM predicted that they would occur more frequently around depths from 30?60 m, increasing with low SST and high chl a con?centration. For the anthropogenic component, the model predicted that non-migrant cetaceans would occur up to 10 km from fishing grounds. Our study modeled the influence of anthropogenic activities on cetaceans, and indicates specific priority areas for cetacean conservation, contribut?ing at a local and national scale.

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