Results 61 to 70 of about 13,633 (199)

Ecologia alimentar e espacial da toninha (pontoporia blainvillei) e do boto-cinza (Sotalia guianensis) na Baía da Babitonga, Sul do Brasil [PDF]

, 2015
Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências Biológicas, Programa de Pós-Graduação em Ecologia, Florianópolis, 2015A toninha (Pontoporia blainvillei) é um pequeno golfinho endêmico do Oceano Atlântico Sul Ocidental.
Paitach, Renan Lopes
core  

Using Aerial Photogrammetry to Estimate Body Condition and Assess Sexual Dimorphism in Narwhals

Marine Mammal Science, Volume 42, Issue 4, October 2026.
ABSTRACT The Arctic is warming rapidly, impacting ice‐dependent species and communities that rely on them for resources. Body condition indices (BCI) are widely used to assess individual health within populations. We adapted the methodology to improve accessibility for estimating narwhal body condition from drone footage, using body length, body width,
Kirsten J. Désorcy, Jane M. Waterman, Courtney R. Shuert, James D. Roth, Marianne Marcoux   +4 more
wiley   +1 more source

Abundance of two Guiana dolphin (Sotalia guianensis) populations inhabiting adjacent areas in southeastern Brazil

Marine mammal science
Guiana dolphins (Sotalia guianensis) are commonly found in shallow waters from South and Central America. From March 2018 to June 2019, boat surveys were conducted to monitor two populations inhabiting the adjacent waters of Ilha Grande Bay and Sepetiba ...
R. Carvalho, Carlos Eduardo P. Quintana, C. V. D. dos Santos, E. Santos-Neto, Lis Bittencourt, Karina S. Pereira, T. Bisi, M. Kajin, J. Lailson-Brito, A. F. Azevedo   +9 more
semanticscholar   +1 more source

Report of the Sotalia guianensis Pre-Assessment Workshop (São Paulo, Brazil, 26-28 November 2019)

J. Cetacean Res. Manage., 2021
How to cite: International Whaling Commission, 2021. Report of the Scientific Committee: Report of the Sotalia guianensis pre-assessment workshop. J. Cetacean Res. Manage. Supp. 22: 335-378. 

semanticscholar   +1 more source

Efficiency of wear and decalcification technique for estimating the age of estuarine dolphin Sotalia guianensis

Journal of Biosciences, 2011
Most techniques used for estimating the age of Sotalia guianensis (van Beneden, 1864) (Cetacea; Delphinidae) are very expensive, and require sophisticated equipment for preparing histological sections of teeth. The objective of this study was to test a more affordable and much simpler method, involving of the manual wear of teeth followed by ...
Nicolle V, Sydney, Emygdio L A, Monteiro-Filho   +1 more
openaire   +2 more sources

Coordinated feeding behavior of the Guiana dolphin, Sotalia guianensis (Cetacea: Delphinidae), in southeastern Brazil: a comparison between populations

Zoologia (Curitiba), 2013
The coordinated feeding tactics used by delphinids are influenced by differences in the distribution of prey species, season, and opportunities for social learning.
Elaine C. da S. Oliveira, Rodrigo H. Tardin, Fabiana R. Poletto, Sheila M. Simão   +3 more
doaj   +1 more source

Fatal asphyxia due to laryngeal displacement by large-sized prey in a Guiana dolphin (Sotalia guianensis), Brazil [PDF]

Ciência Rural, 2020
: The Guiana dolphin (Sotalia guianensis) is a small odontocete distributed from Santa Catarina state, Brazil, to Honduras. Although it is currently considered “near threatened” by the International Union for Conservation of Nature, considerable ...
Daniela Bueno Mariani, Juliana Plácido Guimarães, Renata Guedes Batista, Andrei Brum, Kátia Regina Groch, Josué Díaz-Delgado, Jociery Einhardt Vergara Parente   +6 more
doaj   +1 more source

Reproductive Biology and Growth Patterns of Pontoporia blainvillei (Artiodactyla, Pontoporiidae) From Santa Catarina State, Southern Brazil

Marine Mammal Science, Volume 42, Issue 4, October 2026.
ABSTRACT This study evaluated reproductive parameters and growth patterns of male and female franciscana dolphins, Pontoporia blainvillei, in Santa Catarina State, southern Brazil, between Franciscana Management Area (FMA) II and III. We analyzed ovarian and testicular characteristics, counted the tooth growth layer groups, and constructed growth ...
E. Cordeiro, R. L. Paitach, V. R. M. Conversani, G. Rogge‐Renner, P. V. Castilho, M. J. Cremer   +5 more
wiley   +1 more source

Anatomical and volumetric description of the guiana dolphin (Sotalia guianensis) brain from an ultra-high-field magnetic resonance imaging

Brain Structure and Function
The Guiana dolphin (Sotalia guianensis) is a common species along Central and South American coastal waters. Although much effort has been made to understand its behavioral ecology and evolution, very little is known about its brain.
Kamilla Avelino-de-Souza, Heitor Mynssen, K. Chaim, Ashley N. Parks, J. Ikeda, H. Cunha, B. Mota, Nina Patzke   +7 more
semanticscholar   +1 more source

Population density of Sotalia guianensis (Cetacea: Delphinidae) in the Cananéia region, Southeastern Brazil

Revista de Biología Tropical, 2010
Population density in cetaceans can be estimated through photo-identification, mark-recapture, land-based observations and visual estimative. We the aim to contribute with conservation strategies, we used line transects (distance method) to estimate the population density of the river dolphin, S.
Havukainen, Liisa, Leite de Araujo Monteiro Filho, Emygdio, de Fatima Filla, Gislaine   +2 more
openaire   +8 more sources