ESA EcoEd Digital Library (beta)
The Bearded Vulture (Gypaetus barbatus) is a threatened species. Many conservation programs aim to increase population size by improving survival and reproduction; however, density dependence may...
A herd of alpine ibex (Capra ibex) struggles through deep snow. A recent study examined 45 years of census data for a population of alpine ibex in Gran Paradiso National Park in northwestern Italy....
A juvenile Marbled Murrelet (Brachyramphus marmoratus) sits on its nest platform high in an old-growth Douglas fir. The Marbled Murrelet is an endangered seabird. A recent study used age-ratio...
A male Klug’s clearwing butterfly (Dircenna klugii klugii) foraging on a coffee flower (Coffea arabica) in the Soconusco region of Chiapas, Mexico. Shade-grown coffee certification programs...
Different land uses have created a varied landscape in the Willamette Basin of Oregon that supports a rich array of species as well as an array of economic activities. Researchers have recently...
An adult male valley elderberry longhorn beetle (Desmocerus californicus dimorphus) perches on a leaf of its host plant, blue elderberry (Sambucus mexicana). Although classic metapopulations are...
The southern torrent salamander (Rhyacotriton variegatus) inhabits small, cool, headwater streams and seeps in conifer-dominated forests, primarily in the Coast Ranges of Oregon and northern...
Aerial view of the upper Willamette River, Oregon. Although some off-channel features and riparian forest remain, particularly in upper reaches as illustrated here, overall the Willamette River has...
African elephants (Loxodonta Africana) have an important impact on that ecosystem type, influencing its structure, function, and composition. In Kruger National Park, South Africa, park scientists,...
The Iberian lynx (Lynx pardinus) is a carnivorous mammal that was once common on the Iberian Peninsula, where its preferred habitat is scrub vegetation and Mediterranean woodland. The species...
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