Sandpiper (Actitis hypoleucos) Science Article 1 abstract Evolutionary theory predicts adaptive adjustment in offspring sex ratio by females. Seasonal change in sex ratio is one possibility, tested here in two sister species, the Common sandpiper and the Spotted sandpiper Actitis hypoleucos and A. macularia. In the monogamous Common sandpiper, males are the most competitive sex. […]
Female greater sandhill Crane continues to incubate affer the loss of her mate
Sandhill Crane (Grus canadensis) Science Article 1 abstract The reproductivep attern of a Greater Sandhill Crane (Grus canadensista tn’da)pair was disrupted in May 1976 when the male was shot and killed on Malheur NationalWildlife Refuge, Oregon. The female continued to incubate a remaining egg, and tendedthe chick near the nest through May. By early June […]
Population genetic structure in migratory sandhill cranesand the role of Pleistocene glaciations
Sandhill Crane (Grus canadensis) Science Article 2 abstract Previous studies of migratory sandhill cranes (Grus canadensis) have made significantprogress explaining evolution of this group at the species scale, but have been unsuccessfulin explaining the geographically partitioned variation in morphology seen on the populationscale. KENNETH L. JONES et al, Molecular Ecology (2005) 14 , 2645-2657 Download […]
Spring migration of Sanderlings Calidris alba through SW Iceland: Wherefrom and whereto?
Sanderling (Calidris alba) Science Article 2 abstract The spring migration of Sanderlings Calidris alba through southwest Iceland was studied in 1989-1990. Additional information was collected during the spring seasons of 1985-88 and 1991. Ringing recoveries and controls, together with a large number of sightings of color-ringed birds, revealed that many Sanderlings staging in Iceland in […]
Sanderlings (Calidris alba) have a magnetic compass: orientation experiments during spring migration in Iceland
Sanderling (Calidris alba) Science Article 1 abstract The migratory orientation of sanderlings (Calidris alba) was investigated with cage experiments during the spring migration in southwest Iceland. Sanderlings were exposed to 90 deg counterclockwise-shifted magnetic fields under both clear skies and natural overcast. Clear sky control tests resulted in a northerly mean direction, in agreement with […]
Arrival and weight gain of Red Knot Calidris canutus, Ruddy Turnstone Arenaria interpresand Sanderling Calidris alba staging in Delaware Bay in spring
Sanderling (Calidris alba) Science Article 3 abstract Delaware Bay is an important spring staging area for shorebirds migrating north along the easternAmerican coast, with birds relying heavily on Horseshoe Crab Limulus polyphemus eggs duringtheir stay. While many species use the Bay, three species are of particular interest: Red KnotCalidris canutus, Ruddy Turnstone Arenaria interpres and […]
Saker Falcon (Falco cherrug) in Russia
Saker Falcon (Falco cherrug) Science Article 4 abstract The Saker (Falco cherrug) is one of the mostendangered falcon species in North Eurasia. In the pastthree decades its range and numbers have been declining atan alarming rate. The species is a typical representative ofarid zone ecosystems and in Russia it occurs at the extremesof its range.In […]
International Action Planfor the Saker Falcon
Saker Falcon (Falco cherrug) Science Article 3 abstract The Saker Falco cherrug qualifies as Globally Endangered because it has undergone a very rapidpopulation decline, particularly on the central Asian breeding grounds, owing to inadequatelycontrolled capture for the falconry trade (BirdLife International 2006). It is also Endangered inEurope due to large declines and its very small […]
Insects inhabiting Saker (Falco cherrug) nestsin Hungary
Saker Falcon (Falco cherrug) Science Article 2 abstract This study describes the species compositionof insects reared from larvalassemblages collected from Saker nests.Eight coleopteran and one dipteranspecies had been reared, none of whichappear to be specific to raptors’s nestsas a habitat. They are either characteristicto carcasses, or known to occur inmanure, or commensals living in a […]
Saker Falcon (Falco cherrug) in Kyrgistan
Saker Falcon (Falco cherrug) Science Article 1 abstract Saker falcons occur throughout Kyrgistan territory both onmigration and during the breeding season. In autumn most passage birdsmigrate along the outer ranges of the mountains on the level of the middleparts of macroslopes and valleys of northern Tyan San and Issikuldepression. Spring migration goes along the same […]