Lizards, crocodiles and turtles have some rocky times ahead. Warming temperatures have the potential to drastically alter the reproductive ability of reptiles, affecting their genetic breakdown as well as their evolution. With worsening climate change plus habitat degradation, pollution and other human influences, maintaining populations is likely going to be an uphill battle.
Temperature can have a significant effect on reptiles’ diversity. Their sex genetics tend to “differ from typical vertebrates in that their sex is not determined by their genes,” said Scientific American. Rather, the “temperature of their nest pushes them toward becoming male or female.” This is called Temperature-Dependent Sex Determination (TSD). A world of increased heat from climate change means that “entire generations of sexually reproducing reptiles will be dramatically skewed male or female.” This shifts the entire balance of species. Some scientists have predicted there could be only one sex of alligators by the year 2100.
Unfortunately, this development may lead to a “sexpocalypse” that spells the end of some species. “Mating opportunities will decline; populations might become inbred,” said Scientific American.
Many reptiles also face additional dangers, giving them even worse odds of survival. “For reptiles that already face habitat loss and pollution, this genetic sensitivity adds a quiet risk,” said Earth.com. The good news is that by “knowing the genetic makeup of males and females, scientists can predict how changes in temperature might affect sex ratios in the wild.” Global warming “not only affects the climate, but also influences the adaptation mechanisms of animals to survive,” said Laura González Rodelas, a co-author of the study, in a statement. |