Tag: "warblers" at biology news

Two warbler species find the West isn't big enough for both of them

...nd dihydrotestosterone have given male Townsend's warblers the upper hand in competition for territory and ma...d by the higher androgen levels, has pushed hermit warblers out of their former range and into territory, often less desirable, that is farther south and west. ...

A changing landscape may have dire implications for birds

...ape, but species like the scarlet tanager and some warblers depend on large, contiguous tracts of forest to successfully reproduce. Humans, according to Pidgeon and Lepczyk, can benefit some birds by establishing feeding stations, sources of water and nesting boxes. But the increased density of housing, espec...

Using science to restore habitat for declining species

...North America in April or May. Numbers of cerulean warblers have declined by an estimated 70 percent since 1966, prompting wildlife ecologists to warn of their possible extinction. SRS researcher Paul Hamel has been researching the ecology and demographics of the cerulean warbler for over two decades. Hamel i...

Keeping populations of cerulean warbler healthy

... the lower slopes of the Andes in August, cerulean warblers return in April or May to build nests in the upper...ch questions that remain to be answered. "Cerulean warblers are very difficult to study in the field because they nest and forage in the high canopy," says Hame...

'Snowbirds' versus real birds

...pe of habitat. Next, blood samples were taken from warblers in their breeding grounds, and finally the birds' reproductive success was measured by counting the number of "fledged" offspring to leave their nests. The study, funded by the Natural Sciences and Engineering Research Council (NSERC), Canada Foundat...

Bird 'breathalyzer' helps assess migratory diet

...of the last two years, Podlesak caught a number of warblers that ate something very different than was expected. He wonders if the birds stopped somewhere out of the ordinary or if there is an unknown migratory stopover site that provides the birds with an unusual diet. Podlesak also discovered that some whi...

Effects of global warming already being felt on plants and animals worldwide

...g apart of communities. For example, four types of warblers feed on spruce budworm caterpillars. But the birds are shifting north. What happens when the birds no longer are present in the southern portion of their ranges, and the caterpillar population is no longer kept in check?" She predicted that rapid cli...

Sprawl may threaten wildlife in reserves

...nd population growth of American robins and yellow warblers at two types of sites: low-elevation cottonwood s... to renest. The researchers also found that yellow warblers may already be threatened by development. The results suggest that even though more females are rene...

Traditional floodplain forest restoration may decrease bird diversity

...d warblersstrongly preferred bald cyprus, cerulean warblers preferred kingnuthickory, and yellow-billed cuckoos preferred silver maple. Moreover, thethree trees preferred by most of the birds (kingnut hickory, bitternuthickory and silver maple) were also uncommon in the study area. Two of these three most-pr...

Researchers link migratory birds' winter, summer ranges

...ory birds are most vulnerable. Black-throated blue warblers belong to a group known as Neotropical migrant son...patterns. The study shows that black-throated blue warblers breeding during the summer months in the northern part of their range (New Brunswick to northern Mic...

Chemical evidence proves the old adage, Birds of a feather flock together

...t uses chemicals in the feathers of North American warblers to identify the birds elusive wintering grounds mo...ing populations of a migrant bird. Black-throated warblers In the their study, the researchers analyzed minute chemical traces of carbon and hydrogen in the fe...

Prescribed burning may threaten ground nesting birds

... declined by more than 80%: ovenbirds, worm-eating warblers and hooded warblers. The researchers attribute the...tter to build and conceal their nests. Worm-eating warblers nest on the ground in high moisture areas, and the burns presumably dried them out and made them les...

Fragmentation may limit songbird sex lives

... movements, the researchers radiotracked 20 of the warblers in forest fragments separated by agricultural fiel...expected result that could explain why male hooded warblers living in fragments put so much effort into leaving them. About 60% of their forays were to woodlots...

Biologists uncover Darwins missing evidence for divergence of species in a warblers song

...netics of a series of interbreeding populations of warblers in central Asia, how one species can diverge into ... to defend territories," says Irwin. "The greenish warblers living in the Himalayas sing songs that are simple, short and repetitive. As you go north along the ...

New Cosumnes River research partnership announced

...tate list of threatened species, and geese, ducks, warblers and sandhill cranes reside in the floodplain forests, marshes and farm fields. In riverside forests, beavers harvest branches from tall cottonwood trees and scrub jays gather acorns from rare old groves of valley oaks. The river and its surrounding f...

With support for the EPA, biologists go out on a genetic limb to help stem migratory songbird declines

...-risk species. For example, of the142,000 Wilson's warblers banded on North American breeding grounds over a20... in Mexico a small breeding population of Wilson's warblers from the SanFrancisco Bay Area spends its winter each year. "If you can link wintering and breeding...

Migratory songbird breeding linked to winter habitat

...what happens in the tropical forests where migrant warblers spend theirwinters and what happens in the Northern woods where they spend the next summerare inextricably linked. Research on the population dynamics of migratory birds has been hampered by thedifficulty of tracking individual birds throughout their...

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