Resultado de búsqueda
24 de oct. de 2019 · Mass starvation is the quick, one-way, surefire route to extinction—especially since hunger-weakened populations are much more prone to disease and predation—and the effect on the food chain can be disastrous. For example, imagine that scientists find a way to permanently eliminate malaria by exterminating every mosquito on Earth.
Extinction is the termination of a taxon by the death of its last member.A taxon may become functionally extinct before the death of its last member if it loses the capacity to reproduce and recover. Because a species' potential range may be very large, determining this moment is difficult, and is usually done retrospectively. This difficulty leads to phenomena such as Lazarus taxa, where a ...
9 de dic. de 2020 · Stanford scientists and colleagues have uncovered evidence, for example, that the biggest extinction in Earth's history was caused by global warming that left ocean animals unable to breathe. An artist's impression of the dinosaur-killing asteroid impact that created Chicxulub crater. (Image credit: NASA)
28 de mar. de 2019 · The infectious disease that has devastated the most biodiversity is a fungal killer of amphibians, researchers report today in Science. Around the world, 90 species are thought to have gone extinct because of the fungus. And at least another 491 species have declined because of it. The culprit with this "unprecedented lethality" is ...
There are animals with a good gene pool that is robust and more adaptable to unforeseen exogenous circumstances, and others that are weaker. Destruction of wild habitats. Man is a direct cause of the extinction of species: out of the 8 million existing, 1 million are in danger due to overexploitation of resources on land and at sea.
Invading infectious diseases can, in theory, lead to the extinction of host populations, particularly if reservoir species are present or if disease transmission is frequency-dependent. The number of historic or prehistoric extinctions that can unequivocally be attributed to infectious disease is relatively small, but gathering firm evidence in retrospect is extremely difficult.
While there have been amazing and inspirational wildlife successes and stories in the past, many animals are still endangered mostly due to unsustainable human-led activities. Currently, on the International Union for Conservation of Nature (IUCN) red list, more than 41,000 species have been assessed to be under threat of extinction .
