Sentences with phrase «in swordtail»

For Molly Schumer, a postdoctoral fellow in genetics and evolutionary biology at Harvard Medical School, the fellowship will help fund her research on how evolutionary forces affect our genes, focusing in particular on a persistent trait that can cause melanoma in swordtail fish.

Not exact matches

To see if the presence of UV signals mattered to female swordtails or Mexican tetras, the investigators put the fish in aquariums with illumination that mimicked natural underwater light conditions and filters that either blocked or permitted UV light.

When the researchers took UV photographs of five swordtail species, they found that UV ornamentation is most prominent in males of species that inhabit regions with lots of Mexican tetras.

The interbreeding between those species probably took place more than 2,500 generations ago, though swordtails in other rivers have hybridized more recently.

In other streams nearby lives the swordtail, which looks much the same, although the males lack spots and have a long tail.

Male Hawaiian swordtail crickets (Laupala cerasina) know how to get their women in the mood.

In the Calnali River in Mexico, two pure species of swordtail fish live side by side with a third population that's a mix of the original twIn the Calnali River in Mexico, two pure species of swordtail fish live side by side with a third population that's a mix of the original twin Mexico, two pure species of swordtail fish live side by side with a third population that's a mix of the original two.

Unlike the majority of fish in which females lay eggs that are later fertilized by males, live - bearers — which include species such as mollies, platies, guppies, swordtails and mosquitofish — have internal fertilization.

Striped swordtails and monarchs, grass yellows and redtops — all the butterflies — flitted leisurely from one flower to the next... As for us, we moved about in that unhurried way of the butterflies, as if the breeze was sweet, as if the sun on our skin was a caress.