Results 1 to 10 of about 2,291 (181)

Investigation into the causes of mortality in cetaceans and sirenian populations in the Andaman Sea, Thailand: A retrospective analysis spanning 2018–2023 [PDF]

Veterinary World
Background and Aim: Cetaceans and sirenians are endangered marine mammals that are threatened by stranding and mortality. In Thailand’s Andaman Sea, limited data exist on the causes and patterns of these events.
Chayanis Daochai, Peerapon Sornying, Narissara Keawchana, Sareepah Manmoo, Piyarat Khumraksa, Patchaporn Kaewmong, Santi Ninwat, Tipamat Upanoi, Pimwarang Sukkarun, Watcharapol Suyapoh   +9 more
doaj   +2 more sources

Comparative genomics of sirenians reveals evolution of filaggrin and caspase-14 upon adaptation of the epidermis to aquatic life [PDF]

Scientific Reports
The mammalian epidermis has evolved to protect the body in a dry environment. Genes of the epidermal differentiation complex (EDC), such as FLG (filaggrin), are implicated in the barrier function of the epidermis.
Julia Steinbinder, Attila Placido Sachslehner, Karin Brigit Holthaus, Leopold Eckhart   +3 more
doaj   +2 more sources

Sirenian genomes illuminate the evolution of fully aquatic species within the mammalian superorder afrotheria [PDF]

Nature Communications
Sirenians of the superorder Afrotheria were the first mammals to transition from land to water and are the only herbivorous marine mammals. Here, we generated a chromosome-level dugong (Dugong dugon) genome.
Ran Tian, Yaolei Zhang, Hui Kang, Fan Zhang, Zhihong Jin, Jiahao Wang, Peijun Zhang, Xuming Zhou, Janet M. Lanyon, Helen L. Sneath, Lucy Woolford, Guangyi Fan, Songhai Li, Inge Seim   +13 more
doaj   +2 more sources

Total evidence time-scaled phylogenetic and biogeographic models for the evolution of sea cows (Sirenia, Afrotheria) [PDF]

PeerJ, 2022
Molecular phylogenetic studies that have included sirenians from the genera Trichechus, Dugong, and Hydrodamalis have resolved their interrelationships but have yielded divergence age estimates that are problematically discordant.
Steven Heritage, Erik R. Seiffert
doaj   +3 more sources

Aquatic sloths (Thalassocnus) from the Miocene of Chile and the evolution of marine mammal herbivory in the Pacific Ocean [PDF]

PeerJ
The evolution of marine mammals in South America includes unique and extinct lineages found nowhere else in the world, such as the walrus-convergent whale Odobenocetops and multiple aquatic sloth species belonging to the genus Thalassocnus.
Ana M. Valenzuela-Toro, Nicholas D. Pyenson, Jorge Velez-Juarbe, Mario E. Suárez   +3 more
doaj   +3 more sources

Ancestral chromosomal signatures of Paenungulata (Afroteria) reveal the karyotype of Amazonian manatee (Trichechus inunguis, Sirenia: Trichechidae) as the oldest among American manatees [PDF]

BMC Genomics, 2023
Background Chromosomal painting in manatees has clarified questions about the rapid evolution of sirenians within the Paenungulata clade. Further cytogenetic studies in Afrotherian species may provide information about their evolutionary dynamics ...
Flávia dos Santos Tavares, Willam Oliveira da Silva, Malcolm Andrew Ferguson-Smith, Alex Garcia Cavalleiro de Macedo Klautau, Jairo Moura Oliveira, Angélica Lúcia Figueiredo Rodrigues, Gabriel Melo-Santos, Julio Cesar Pieczarka, Cleusa Yoshiko Nagamachi, Renata Coelho Rodrigues Noronha   +9 more
doaj   +2 more sources

Fossil Sirenia from the Pleistocene of Qatar: new questions about the antiquity of sea cows in the Gulf Region [PDF]

PeerJ, 2022
One of the largest and least documented populations of dugongs (Dugong dugon) resides in the coastal waters of the United Arab Emirates, and waters surrounding Saudi Arabia, Bahrain, and Qatar.
Nicholas D. Pyenson, Mehsin Al-Ansi, Clare M. Fieseler, Khalid Hassan Al Jaber, Katherine D. Klim, Jacques LeBlanc, Ahmad Mujthaba Dheen Mohamed, Ismail Al-Shaikh, Christopher D. Marshall   +8 more
doaj   +3 more sources

Evolution of canonical circadian clock genes underlies unique sleep strategies of marine mammals for secondary aquatic adaptation. [PDF]

PLoS Genetics
To satisfy the needs of sleeping underwater, marine mammals, including cetaceans, sirenians, and pinnipeds, have evolved an unusual form of sleep, known as unihemispheric slow-wave sleep (USWS), in which one brain hemisphere is asleep while the other is ...
Daiqing Yin, Zhaomin Zhong, Fan Zeng, Zhikang Xu, Jing Li, Wenhua Ren, Guang Yang, Han Wang, Shixia Xu   +8 more
doaj   +2 more sources

The genome of African manatee Trichechus senegalensis reveals secondary adaptation to the aquatic environment [PDF]

iScience
Summary: Sirenians exhibit unique aquatic adaptations, showcasing both convergent adaptive features shared with cetaceans and unique characteristics such as cold sensitivity and dense bones.
Xin Huang, Guixin Dong, Huizhong Fan, Wenliang Zhou, Guangping Huang, Dengfeng Guan, Delu Zhang, Fuwen Wei   +7 more
doaj   +2 more sources

Cetacean loss of the master adipose tissue regulator β3-adrenergic receptor may underlie their thick blubber and an Oligocene radiation and dispersal [PDF]

Nature Communications
Blubber is a hydrostatic pressure-resistant and insulating vascularized layer of subcutaneous adipose tissue beneath the skin found in cetaceans, pinnipeds, and sirenians.
Ran Tian, Tong Zhang, Hao Dong, Inge Seim, Guang Yang   +4 more
doaj   +2 more sources