Brant Goose (Branta bernicla) Science Article 7 abstract The use by Brent Geese of five pairs of winter cereal and pasture fields at Pagham Harbour, West Sussex, England was measured from November 1991 through the end of March 1992. A switch from winter cereals to pasture was observed between November and December. Monthly vegetation samples […]
Regulation of numbers of Dark-bellied Brent Geese Branta bernicla bernicla on spring staging sites.
Brant Goose (Branta bernicla) Science Article 6 abstract The usage of the Boschplaat salt-marsh on Terschelling over a 30-year period by Brent Geese Branta b. bernicla, is compared with that on improved grassland on Texel. Natural salt-marsh turns out to be a preferred spring staging habitat. Spring feeding on grassland is a new phenomenon. An […]
Abundance of owls and Bramblings Fringilla montifringilla inrelation to mast seeding in south-eastern Sweden
Brambling (Fringilla montifringilla) Science Article 2 abstract We investigated the relationship between mast seeding in beech Fagus sylvaticus and oak Quercus spp., and the occurrence of the rodent-dependent predators Tengmalm’s Owl aegolius funereus, Long-eared Owl Asio otus and Tawny Owl Strix aluco in south-eastern Sweden (Blekinge) 1992-2000. We also compared available data on seed production […]
Structural conservation and variation in the mitochondrial control region of fringilline finches (Fringilla spp.) and the greenfinch (Carduelis chloris
Brambling (Fringilla montifringilla) Science Article 1 abstract We sequenced the entire control region and portions of flanking genes (tRNAPhe, tRNAGiu, and ND6) in the common chaffinch (Fringilla coelebs), blue chaffinch (F. teydea), brambling (F. montifringilla), and greenfinch (Carduelis chloris). In these finches the control region is similar in length (1,223-1,237 bp) and has the same […]
Do Tengmalm’s owls see vole scent marks visible in ultraviolet light?
Boreal Owl (aegolius funereus) Science Article 3 abstract Scent markings (urine and f ces) of small mammals are visible in ultraviolet (UV) light. Diurnal kestrels, Falco tinnunculus, use them as a cue to find areas of food abundance. We studied whether vole-eating, nocturnal Tengmalm’s owls, golius funereus, can see vole scent marks using UV-vision. In […]
Clutch size and breeding success in relation to nest box size in Tengmalm’s Owl golius funereus
Boreal Owl (aegolius funereus) Science Article 2 abstract Clutch size and breeding success was related to nest-box size in 215 nests of Tengmalm’s owl in the Kauhava region, western Finland in 1966-82, In vole peak years, but not in other years, mean clutch size was positively correlated with the bottom area of the nest-box, increasing […]
Clutch size and breeding success of Tengmalm’s Owl golius funereus in natural cavities and nest boxes.
Boreal Owl (aegolius funereus) Science Article 1 abstract Altogether 287 nests of Tengmalm s Owl golius funereus were visited in 1960-82 in westem Finland. The-clurches were si’nificantly larger in nest-boxes than in natural cavities. The hatching percentage and number of fledglings also seemed to be higher in boxes than in natural nesting places. But the […]
Experimental increase of predation risk induces breeding dispersal of Tengmalm’s owl
Boreal Owl (aegolius funereus) Science Article 4 abstract Nest predation and its avoidance are critical components of an individual’s fitness and play an important role in life history evolution. Almost all studies on this topic have been observational, and thus have not been able to separate the effects of individual quality, habitat selection and predation […]
Nesting habitat selection of Booted Eagle Hieraaetus pennatus in central Catalonia
Booted Eagle (Hieraaetus pennatus) Science Article 1 abstract The Booted Eagle Hieraaetus pennatus is a poorly known raptor that has bred in Catalonia at least since 1989, when the first nest was found. Its confirmed breeding population has increased from 1 breeding pair in 1989 to 13 breeding pairs in 2001. The present study provides […]
Genetically confirmed interbreeding between western Bonelli’s warbler ( Phylloscopus bonelli ) and wood warbler ( P. sibilatrix )
Bonellis Warbler (Phylloscopus bonelli) Science Article 2 abstract During May and June 2003, a mixed breeding pair consisting of a male western Bonelli’s warbler (Phylloscopus bonelli) and a female wood warbler (P. sibilatrix) successfully raised six young in a broad-leafed forest near Junkerath, western Germany, an area far outside the regular breeding range of P. […]