Environment and Anthropogenic Activities Influence Cetacean Habitat Use in Southeastern Brazil

• Published in: Marine Ecology Progress Series
• Main Authors: Tardin, R. H., Chun, Yongwan, Jenkins, C. N., Maciel, I. S., Simão, S. M., Alves, M. A. S.
• Other Authors: 297769863 (Chun, Y), 0000-0002-4957-1379 (Chun, Y)
• Format: Article in Journal/Newspaper
• Language: English
• Published: Inter-Research 2019
• Subjects: Bryde whale; Rorquals; Cetacea; Delphinidae; Megaptera; Humpback whale; Tursiops truncatus; Bottlenose dolphin; Eigenvectors; Modeling; Upwelling (Oceanography); Bryde; Humpback Whale; Megaptera novaeangliae
• Online Access: https://hdl.handle.net/10735.1/7712; https://doi.org/10.3354/meps12937

Due to copyright restrictions and/or publisher's policy full text access from Treasures at UT Dallas is limited to current UTD affiliates (use the provided Link to Article). Supplementary material is available on publisher's website. Use the DOI link below. Investigating the influence of coastal development on marine environments is a priority 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 habitats. 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 common 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 distance 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 concentration. 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, contributing at a local and national scale. © Inter-Research 2019 Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) ...