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Temperature-dependent sex determination (TSD) is a type of environmental sex determination in which the temperatures experienced during embryonic/larval development determine the sex of the offspring. [1] It is observed in reptiles and teleost fish, with some reports of it occurring in species of shrimp.
Egg incubation is done under favorable environmental conditions, possibly by brooding and hatching the egg. Multiple and various factors are vital to the incubation of various species of animal. In many species of reptile for example, no fixed temperature is necessary, but the actual temperature determines the sex ratio of the offspring.
The sex of alligators is determined by nest temperature. The sex of most amniote vertebrates, such as mammals and birds, is determined genetically. [12] However, some reptiles have temperature-dependent sex determination, where sex is permanently determined by thermal conditions experienced during the middle third of embryonic development.
The sex of the young depends on the temperature at which the eggs are incubated. This is called temperature dependent sex determination, and it is used by all turtle species to determine sex. For the alligator snapping turtle, higher temperatures produce more males in a clutch. [31]
What could have been a scene out of Jurassic Park was real life as footage of an extremely rare reptile's hatching has arrived.
The eggs hatch in about 60 to 70 days. As with other reptiles, the nest's ambient temperature determines the sex of the hatchings. After nightfall, the hatchings dig to the surface and walk to the sea. [89] [90] The morphology of offspring has been found to vary with nest incubation temperatures. Higher temperatures resulted in lower mass ...
Most reptiles are also cold-blooded, so they’re unable to regulate their own body temperature. Instead, they rely on external heat sources like the sun or the best reptile heating pads to do so.
Amniotes include reptiles (including dinosaurs and their descendants, birds) and mammals. Reptile eggs are often rubbery and are always initially white. They are able to survive in the air. Often the sex of the developing embryo is determined by the temperature of the surroundings, with cooler temperatures favouring males.