Results 161 to 170 of about 13,633 (199)

Aspects of Behavioral Ecology of Sotalia guianensis in Sepetiba Bay, Southeast Brazil

Marine Mammal Science, 2008
Boat-based surveys were conducted from August 2002 to July 2003 to study the activity patterns, spatial pattern of area use, and group characteristics of Sotalia guianensis in Sepetiba Bay, southeast Brazil.
Leonardo Flach, Adriano G. Chiarello
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Burst pulses of Guiana dolphin (Sotalia guianensis) in southeastern Brazil

The Journal of the Acoustical Society of America, 2017
Acoustic studies of Guiana dolphin have been focused on whistles, with little known about pulse signals in this species. This study characterized the temporal and spectral properties of Guiana dolphin burst pulses. Groups of 2 to 23 Guiana dolphins were recorded while feeding and socializing in shallow waters in Guanabara Bay, southeastern Brazil, in ...
Luciana Guimarães de, Andrade, Tatiana Lemos, Bisi, José, Lailson-Brito, Alexandre de Freitas, Azevedo   +3 more
openaire   +2 more sources

The legacy and future of multiple anthropogenic stressors: Organohalogen compounds in the vulnerable Guiana dolphin (Sotalia guianensis).

Journal of Hazardous Materials
Chemical pollution is one of the main threats to cetaceans, such as the coastal Guiana dolphin (Sotalia guianensis), a vulnerable species exposed to multiple anthropogenic stressors.
Nara Nádja Severiano de Oliveira Ferreira, E. Santos-Neto, B. Manhães, Monizze Vannuci-Silva, A. Colosio, Hernani Gomes da Cunha Ramos, I. A. G. Cunha, L. Barbosa, A. Farro, D. M. Faria, H. Cunha, T. Bisi, A. F. Azevedo, J. Lailson-Brito   +13 more
semanticscholar   +1 more source

Legacy persistent organic pollutants (POPs) are still a threat to marine top predators from Brazil: POPs and halogenated natural bipyrrole in live, free-ranging Guiana dolphins, Sotalia guianensis, from a tropical estuary.

Environmental Pollution
Persistent organic pollutants (POPs) are still critical contaminants in marine ecosystems, particularly affecting top predators such as cetaceans. High halogenated natural products (HNPs) can also accumulate in biota.
Dhoone Menezes-Sousa, César Bruno Miranda Pessoa, Larissa Schmauder Teixeira Cunha, G. P. Bighetti, Natasha Rodrigues Renz, R. Montone, W. Vetter, P. Dorneles, L. Flach, João Paulo Machado Torres, M. B. Alonso   +10 more
semanticscholar   +1 more source

Environmental and behavioral factors influencing individual variation in spatial use by Guiana dolphins (Sotalia guianensis)

Journal of Mammalogy, 2021
Marine apex predators, such as coastal dolphins, are key components of ecosystem function and dynamics; understanding their spatial use therefore is important for conservation planning.
Stephane P. G. de Moura, M. Cantor, M. Broadhurst, Camilla Domit   +3 more
semanticscholar   +1 more source

Potential distribution of Guiana dolphin (Sotalia guianensis): a coastal-estuarine and tropical habitat specialist

Journal of Mammalogy, 2021
Ecological niche models (ENMs) predict where species can occur in accordance with environmental factors. Suitability maps are generated through models to identify habitats more or less adapted to the species.
Aline de Jesus Lobo, L. Wedekin, T. Sobral‐Souza, Y. Le Pendu   +3 more
semanticscholar   +1 more source

Identification and characterization of plastic debris in the gastrointestinal tract of Guiana dolphins (Sotalia guianensis) from Espírito Santo coast, Brazil.

Marine Pollution Bulletin
The Guiana dolphin (Sotalia guianensis) is categorized as vulnerable in the Brazilian list of endangered animals, and its populations suffer from several anthropological threats.
Letícia Versiani Gomes da Silva, Isis de Oliveira Carvalho Demarque, Eloá Côrrea Lessa Tostes, Marcus de Souza Araújo, C. E. V. de Carvalho, M. Canela, L. Barbosa, L. S. da Silveira   +7 more
semanticscholar   +1 more source

Guiana Dolphins (Sotalia guianensis) as Marine Ecosystem Sentinels: Ecotoxicology and Emerging Diseases

2013
Guiana dolphins (Sotalia guianensis) are small cetaceans that inhabit coastal regions down to a 50 m depth. As a coastally distributed species, they are exposed to a variety of human-induced risks that include passive fishing nets, persistent environmental pollution, and emerging diseases. As a top predatorS. guianensis occupies an important ecological
Jailson Fulgencio, de Moura, Rachel Ann, Hauser-Davis, Leila, Lemos, Renata, Emin-Lima, Salvatore, Siciliano   +4 more
openaire   +2 more sources

Ups and downs: An insight on the stranding pattern of Guiana dolphins, Sotalia guianensis, in the Amazon Estuary, Northern Brazil

Aquatic conservation
Long‐term systematic records of cetacean strandings are valuable indicators of temporal responses of specific cetacean populations and communities to natural or anthropogenic pressures. They also help guide management objectives and conservation actions.
Greicy F. Ruenes, A. F. Costa, Maíra Laeta, Renata Emin‐Lima, L. R. Oliveira, Salvatore Siciliano   +5 more
semanticscholar   +1 more source

Timing of ontogenetic changes of two cranial regions in Sotalia guianensis (Delphinidae)

Mammalian Biology, 2012
Despite the fact that heterochronic processes seem to be an important process determining morphological evolution of the delphinid skull, previous workers have not found allometric scaling as relevant factor in the differentiation within the genus Sotalia. Here we analyzed the skull ontogeny of the estuarine dolphin S.
Nicolle V. Sydney, Fabio A. Machado, Erika Hingst-Zaher   +2 more
openaire   +1 more source