Seychelles warblers live and breed in family groups on the tiny island of Cousin. In each group, a dominant female and male reproduce. When helpers assist the with incubation and feeding of chicks, the dominant female breeders age more slowly and live longer, a study by biologists shows. The results indicate how cooperative breeding -- which also occurs in other species, including humans -- can increase life span.
There are roughly five times as many recreational fishers as commercial fishers throughout the world. And yet, the needs and peculiarities of these recreational fishers have largely been ignored in international fisheries and conservation policy.
Scientists analyzed data spanning more than four decades and concluded that the impact of lake trout in Yellowstone Lake -- in particular, the decline of native cutthroat trout -- has cascaded across the lake, its tributaries and the surrounding ecosystem.