dziwne-zwierzęta-oceaniczne: Sea turtle

Evidence: 100 • authority: 72

Sea turtles (superfamily Chelonioidea), sometimes called marine turtles, are reptiles of the order Testudines and of the suborder Cryptodira. The seven existing species of sea turtles are the flatback, green, hawksbill, leatherback, loggerhead, Kemp's ridley, and olive ridley. Five of the seven species are listed as threatened with extinction globally on the IUCN Red List of Threatened Species. The remaining two are not considered to be threatened with extinction, one of which, the flatback turtle, is found only in the waters of Australia, Papua New Guinea, and Indonesia. Sea turtles can be categorized as hard-shelled (cheloniid) or leathery-shelled (dermochelyid). The only dermochelyid spe…

Evidence: 51 • authority: 72

The Australian flatback sea turtle (Natator depressus) is a species of sea turtle in the family Cheloniidae. The species is endemic to the sandy beaches and shallow coastal waters of the Australian continental shelf. This turtle gets its common name from the fact that its shell has a flattened, lower dome than the other sea turtles. It can be olive green to grey with a cream underside. It averages from 76 to 96 cm (30 to 38 in) in carapace length and can weigh from 70 to 90 kg (150 to 200 lb). The hatchlings are larger than other sea turtle hatchlings when they hatch and emerge from their nests. The flatback turtle is listed by the IUCN Red List of Threatened Species as data deficient, mean…

Evidence: 44 • authority: 88

Tropical flatback turtle embryos (<i>Natator depressus</i>) are resilient to the heat of climate change. Climate change is threatening reproduction of many ectotherms by increasing nest temperatures, potentially making it more difficult for females to locate nest sites that provide suitable incubation regimes during embryonic development. Elevated nest temperatures could increase the incidence of embryonic mortality and/or maladaptive phenotypes. We investigated whether elevated nest temperatures reduce hatching success in tropical flatback turtles (Natator depressus) nesting in the Gulf of Carpentaria, Australia. Egg incubation treatments began at 29.5°C and progressively increased in temp…

Evidence: 44 • authority: 72

The green sea turtle (Chelonia mydas), also known as the green turtle, black sea turtle, and Pacific green turtle, is a species of large sea turtle of the family Cheloniidae. It is the only species in the genus Chelonia. Its range extends throughout tropical and subtropical seas around the world, with two distinct populations in the Atlantic and Pacific Oceans, but it is also found in the Indian Ocean. The common name refers to the usually green fat found beneath its carapace, due to its diet strictly being seagrass, not to the color of its carapace, which is olive to black. The dorsoventrally flattened body of C. mydas is covered by a large, teardrop-shaped carapace; it has a pair of large…

Evidence: 38 • authority: 80

A "lost years" Flatback Turtle Natator depressus (Garman, 1848) found

Evidence: 38 • authority: 92

The genomic basis of independent marine transitions in turtles: convergent episodic adaptation and demographic shifts.. The transition from terrestrial to marine environments represents one of the most fundamental evolutionary shifts in vertebrate history, requiring radical physiological and genomic remodeling. We investigated the genomic signatures of saltwater adaptation in the green sea turtle (Chelonia mydas), the leatherback turtle (Dermochelys coriacea), and the independently evolved estuarine diamondback terrapin (Malaclemys terrapin). Our analyses reveal that the marine transition is characterized by rapid evolution and expansion in gene families linked to iron metabolism, organ mor…

Evidence: 38 • authority: 88

Intraspecific variability in flatback turtle habitat use: δ15N as an indicator of foraging locations. Identifying migration routes and key habitats is critical for the management and conservation of migratory species. Tracking and stable isotope analysis (SIA), particularly of carbon (δ 13 C) and nitrogen (δ 15 N), are often used to study animal movements, with SIA particularly useful when animals move through isotopic gradients. Marine turtles are typically highly migratory, moving between nesting and foraging grounds often located 100s-1000s km apart. The flatback turtle Natator depressus is endemic to the Australian continental shelf. Satellite tracking (n = 44) and SIA (n = 33) of femal…

Evidence: 38 • authority: 80

Reproductive biology of the flatback turtle Natator depressus in Western Australia

Evidence: 38 • authority: 80

Flatback Turtle (Natator depressus) Nesting at Field Island, Kakadu National Park, Northern Territory, Australia, 1990–2001

Evidence: 38 • authority: 88

Observations on predation of the flatback turtle Natator depressus by the saltwater crocodile Crocodylus porosus at a major rookery in northern Australia. Context We examined predation by the saltwater crocodile (Crocodylus porosus) on the flatback turtle (Natator depressus), an Australian endemic, at Cape Domett, a significant nesting site in Cambridge Gulf, northern Australia, where crocodile populations have recovered since legislative protection was implemented in the 1970s. Aims The investigation aimed to document crocodile predation on flatback turtles across hatchling and adult life stages, assess predation strategies, and evaluate ecological impacts on this genetically distinct turt…

Evidence: 38 • authority: 92

Global assessment of current extinction risks and future challenges for turtles and tortoises.. Turtles and tortoises (chelonians) are among the most threatened vertebrates worldwide, yet the factors determining their high extinction risk and their resilience to further challenges are not fully understood. Here, we compile a dataset comprising intrinsic and extrinsic variables for chelonians to reveal their current risk patterns and extinction vulnerability to future climatic and anthropogenic threats. The results show that at-risk species are predominantly characterized by large body size, small ranges, high functional distinctness, and intense human threat levels, with high representation…

Evidence: 38 • authority: 72

The olive ridley sea turtle (Lepidochelys olivacea), also known commonly as the Pacific ridley sea turtle, is a species of turtle in the family Cheloniidae. The species is the second-smallest and most abundant of all sea turtles found in the world. L. olivacea is found in warm and tropical waters, primarily in the Pacific and Indian Oceans, but also in the warm waters of the Atlantic Ocean. This turtle and the related Kemp's ridley sea turtle are best known for their unique synchronised mass nestings called arribadas, where thousands of females come together on the same beach to lay eggs.