Honeycreeper an Asian immigrant

Scientists from the Smithsonian using DNA data sets to outline the evolutionary family tree of the Hawaiian honeycreeper have determined that the 56 species of the native bird evolved from the Eurasian rosefinch.

In another important finding, the researchers linked the timing of the evolution of the honeycreeper to the formation of the four main Hawaiian Islands.

“It was fascinating to be able to tie a biological system to geological formation and allowed us to become the first to offer a full picture of these birds’ adaptive history,” said Helen James, a research zoologist at the Smithsonian’s National Museum of Natural History and an author of a paper on the study.

Fern Duvall, state Forestry and Wildlife Division wildlife biologist, who was not involved with this study but is working with two of the authors of the paper, James and Rob Fleischer, on a similar project with shorebirds, called the findings “dynamic” and “unique.”

Putting the research in context, Duvall noted that many bird experts believed the honeycreepers to be descendants of the house finch of North America. Instead, the researchers say the Eurasian rosefinch from Asia is the mother bird of the species.

As for the evolutionary discoveries, Duvall said it had been theorized that there was a link between the biologic and geologic development of the birds to the islands. The scientific connection made in the study is new, he said.

“For them to show that that is the case is dynamic,” he said Wednesday. “I think it’s an excellent example that birds’ forms are tied to diverse habitat types.”

Tiny snails survive digestion by birds

Snails are able to survive intact after being eaten by birds, according to scientists.

Japanese white-eyes on the island of Hahajima, Japan feast on tiny land snails.

Researchers found that 15% of the snails eaten survived digestion and were found alive in the birds’ droppings.

This evidence suggests that bird predation could be a key factor in how snail populations spread.

The Japanese white-eye or mejiro is widespread in Japan but considered an invasive species in Hawaii

It is well known that plant seeds are dispersed by birds that eat fruit.

But in findings published in the Journal of Biogeography, researchers from Tohoku University, Japan investigated whether invertebrates could also spread in this way.

Previous research has shown that ponds snails can survive being eaten by fishes but the same was not known for land snails.

Studies of the diets of birds on the island of Hahajima identified the Japanese white-eye’s preference for the tiny land snail Tornatellides boeningi.

In the lab scientists fed the birds with the snails to find out whether any survived the digestive process.

“We were surprised that a high rate, about 15 percent, of snails were still alive after passing through the gut of [the] birds,”