Results 31 to 40 of about 8,460 (181)

Posterior Respiratory Apparatus of Inia geoffrensis and Sotalia fluviatilis: Structure and Ultrastructure [PDF]

International Journal of Morphology, 2017
SUMMARY: This study aimed to characterize the structures of the posterior respiratory system of two species of river dolphins: Inia geoffrensis and Sotalia fluviatilis. The respiratory tract of both species was evaluated using macro and microscopic techniques.
Santos Júnior, Luzivaldo Castro dos, Marmontel, Miriam, Santos, Francisco Glauco de Araújo, Rici, Rose Eli Grassi, Miglino, Maria Angélica, Carvalho, Yuri Karaccas de   +5 more
openaire   +2 more sources

By‐catch risk for toothed whales in global small‐scale fisheries

Fish and Fisheries, Volume 22, Issue 6, Page 1155-1159, November 2021., 2021
Abstract Fisheries by‐catch poses the single greatest threat to cetacean (whales, dolphins and porpoises) populations. Despite this, by‐catch of cetaceans does not receive proportionate levels of research or management effort. The contribution of small‐scale fisheries to cetacean by‐catch is generally overlooked because of the extreme data paucity in ...
Andrew J. Temple, Ethan Westmerland, Per Berggren   +2 more
wiley   +1 more source

Combined effects of life‐history traits and human impact on extinction risk of freshwater megafauna

Conservation Biology, Volume 35, Issue 2, Page 643-653, April 2021., 2021
Abstract Megafauna species are intrinsically vulnerable to human impact. Freshwater megafauna (i.e., freshwater animals ≥30 kg, including fishes, mammals, reptiles, and amphibians) are subject to intensive and increasing threats. Thirty‐four species are listed as critically endangered on the International Union for Conservation of Nature (IUCN).
Fengzhi He, Simone D. Langhans, Christiane Zarfl, Roland Wanke, Klement Tockner, Sonja C. Jähnig   +5 more
wiley   +1 more source

Density and Abundance Estimation of Amazonian River Dolphins: Understanding Population Size Variability

Journal of Marine Science and Engineering, 2021
The dolphins Inia geoffrensis—boto and Sotalia fluviatilis—tucuxi are threatened cetaceans inhabiting river ecosystems in South America; population numbers are still lacking for many areas.
Mariana Paschoalini, Fernando Trujillo, Miriam Marmontel, Federico Mosquera-Guerra, Renan Lopes Paitach, Heloise Pavanato Julião, Gabriel Melo Alves dos Santos, Paul André Van Damme, André Giovanni de Almeida Coelho, Mariana Escobar Wilson White, Alexandre Novaes Zerbini   +10 more
doaj   +1 more source

High variation of mitochondrial DNA diversity as compared to nuclear microsatellites in mammalian populations

Ecological Research, Volume 36, Issue 2, Page 206-220, March 2021., 2021
The empirical relationship between mitochondrial DNA haplotype diversity and microsatellite DNA heterozygosity in 739 populations of 108 mammalian species. Haplotype diversity was higher than the theoretical prediction. Abstract The effective gene number (the number of genes that can be inherited) of mitochondrial DNA (mtDNA) is one‐fourth of that of ...
Takashi Saitoh
wiley   +1 more source

Synapsids and sensitivity: Broad survey of tetrapod trigeminal canal morphology supports an evolutionary trend of increasing facial tactile specialization in the mammal lineage. [PDF]

Anat Rec (Hoboken)
Abstract The trigeminus nerve (cranial nerve V) is a large and significant conduit of sensory information from the face to the brain, with its three branches extending over the head to innervate a wide variety of integumentary sensory receptors, primarily tactile.
Miyamae JA, Benoit J, Ruf I, Sibiya Z, Bhullar BS.   +4 more
europepmc   +2 more sources

Biology of the marine tucuxi dolphin (Sotalia fluviatilis) in south-eastern Brazil [PDF]

Journal of the Marine Biological Association of the United Kingdom, 2004
Age, growth and reproductive parameters related to the marine tucuxi are presented, as well as feeding habits and parasitism. The specimens' age ranged from zero (newborn) to 21 years for males and 0·5 to 30 years for females. In relation to the body dimension, length distributions were bell-shaped for both sexes with male marine tucuxi ranging from 86·
Di Beneditto, Ana Paula Madeira, Ramos, Renata Maria Arruda   +1 more
openaire   +2 more sources

ÁREAS PREFERENCIAIS DE PESCA E DIETA DO ECÓTIPO MARINHO DO BOTO-CINZA (Sotalia fluviatilis ) NA BAÍA DE SEPETIBA, RJ [PDF]

Floresta e Ambiente, 2023
RESUMO Os botos da baía de Sepetiba apresentam preferência por determinadas áreas para a pesca. Estas têm profundidade ≥10 m, sendo que durante o verão e o outono as áreas preferenciais são mais profundas do que durante o inverno e a primavera.
Sheila Marino Simão, Fabiana Rios Poletto   +1 more
doaj  

The Antillean manatee (Trichechus manatus manatus) along the Caribbean coast of Colombia: underused incidental records help identify present and past coastal‐lowland hotspots

, 2023
Marine Mammal Science, Volume 39, Issue 1, Page 322-337, January 2023.
Adolphe O. Debrot, Dalila Caicedo‐Herrera, Isabel Gómez‐Camelo, Yenyfer Moná‐Sanabria, Camila Rosso, Jan Tjalling van der Wal, Antonio A. Mignucci‐Giannoni   +6 more
wiley   +1 more source

Fishing activity in Northern Rio de Janeiro State (Brazil) and its relation with small cetaceans

Brazilian Archives of Biology and Technology, 1998
Research on fishing activity at Atafona village, in Northern Rio de Janeiro, Brazil (21°35'S), was carried out between 1987-96 for the purpose of relating it to the accidental capture of small cetaceans and of estimating the relationship between fishing ...
Ana Paula Madeira Di Beneditto, Renata Maria Arruda Ramos, Neuza Rejane Wille Lima   +2 more
doaj   +1 more source