Capercaillie (Tetrao urogallus) Science Article 3 abstract The capercaillie inhabits a continuous range in large parts of the Palearctic boreal forest, but is patchily distributed in temperate Europe. An ongoing population decline, largely related to human land use changes, has been most pronounced in central and western Europe, where some local populations have become extinct. […]
Diet of the Cantabrian Capercaillie: geographic variation and energetic content
Capercaillie (Tetrao urogallus) Science Article 7 abstract The diet of the Cantabrian Capercaillie Tetrao urogallus cantabricus was examined by fecal analysis. Droppings were sampled from April 1998 to May 1999 around 23 leks that were grouped in five zones. Winter diet consisted of beech buds, pine needles, buds and catkins of birch and holly leaves. […]
Kin groups in closely spaced capercaillie leks
Capercaillie (Tetrao urogallus) Science Article 10 abstract We quantified the genetic structure among 58 capercaillie (Tetrao urogallus) from three closely spaced leks in boreal Russia using ten microsatellite loci. We did not find significant structuring with respect to lek membership in an overall analysis. However, all but one individual could be strongly assigned to one […]
Do disturbances in surrounding areas affect a core population of Cantabrian Capercaillie Tetrao urogallus cantabricus? The case of the Natural Reserve of Muniellos (Asturias, NW Spain)
Capercaillie (Tetrao urogallus) Science Article 9 abstract Aims: The Cantabrian Capercaillie is an endemic subspecies which is declining over much of its range in the Cantabrian Mountains. The main aim of this paper is to test whether human disturbances in areas surrounding mature woodland patches affect more than habitat structure and composition a core population […]
DEMOGRAPHIC AND POPULATION RESPONSES OF CAPE MAYWARBLERS WINTERING IN MULTIPLE HABITATS
Cape May Warbler (Dendroica tigrina) Science Article 2 abstract Wintering Cape May Warblers (Dendroica tigrina) were studied in three habitats along an altitudinal gradient in the Dominican Republic. Results of this study are some of the first to link both population responses and individual condition of nonbreeding birds to prevailing ecological conditions across divergent habitats. […]
The Cape May Warbler (Dendroica tigrina) as an Abundant Autumnal Migrant and as a Destructive Grape Juice Consumer at Berwyn, Pa.
Cape May Warbler (Dendroica tigrina) Science Article 1 abstract For several years, previous to the crushing sleet of the past winter, a pie cherry tree crowned with the foliage of a fugitive Clinton grapevine overhung my shop platform; and a thirty foot pine bending under the weight of several Niagara grapevine runners, stood close to […]
FOOD TRANSIT RATES IN CAPE GANNETS AND JACKASS PENGUINS
Cape Gannet (Morus capensis) Science Article 7 abstract Food transit rates in the JackassP enguin (Spheniscusd emersus), a piscivorous seabird, are slower (Duffy et al. 1985) than rates of birds with other diets (Warner 1981). However, digestive performance by the Jackass Penguin may not be typical of fish-eating seabirds. Food transit rates through the digestive […]
CAPE FUR SEAL ARCTOCEPHALUS PUSILLUS CATCHES CAPE GANNET MORUSCAPENSIS ASHORE AT MALGAS ISLAND
Cape Gannet (Morus capensis) Science Article 2 abstract At 12h15 on 20 September 1995, on approach to Malgas Island (3303S, 1755E) in the West Coast National Park, Western Cape Province, South Africa, we observed an adult bull CapeFur Seal Arctocephalus pusillus on the island near a small group of Cape Gannet Morus capensis nests. It […]
BODY COMPOSITION, FAT RESERVES, AND FASTING CAPABILITY OF CAPE GANNET CHICKS
Cape Gannet (Morus capensis) Science Article 6 abstract Age-related changes in lipid, water, and non-lipid content and energy density of four major body parts (integument, viscera, leg and pectoral muscles, and carcass) of Cape Gannet chicks, juveniles, and adults were studied. The proportion ofwater was typically high for neonates and decreased during development to near […]
Between air and water: the plunge dive of the CapeGannetMorus capensis
Cape Gannet (Morus capensis) Science Article 5 abstract Gannets have one of the most spectacular prey-capture behaviours of all marine predators,plummeting from up to 30 m into the water, where they seize fish with their razor-sharpbeaks. However, there is little detailed information on this brief behaviour. In January and December 2002, we monitored the biomechanics […]