Northern Goshawk (Accipiter gentilis) Science Article 6 abstract Northern goshawks (Accipiter gentilis; hereafter, goshawks) occurthroughout forests of North America and have received muchattention as a target species for management (Reynolds et al. 1992,Iverson et al. 1996, Andersen et al. 2003). Goshawks nest in foreststands with high timber volumes and dense overstory canopiesabove relatively open understories […]
Age-dependent diet choice in an aviantop predator
Northern Goshawk (Accipiter gentilis) Science Article 3 abstract Age-dependent breeding performance is arguably one of the best-documented phenomena in ornithology.The existence of age-related trends has major implications for life-history theory, but the proximatereasons for these patterns remain poorly understood. It has been proposed that poor breeding performanceof young individuals might reflect lack of foraging skills.We […]
Ecology of the Northern Goshawk in Fennoscandia
Northern Goshawk (Accipiter gentilis) Science Article 2 abstract Delayed density-dependent mortality induced by delayed numerical response of predators can drive prey populations to fluctuate in high-amplitude cycles. We studied numerical response of goshawks Accipiter gentilis to varying densities of their main prey (forest grouse) in western Finland during 1979_/1996. Occupancy rate of goshawk territories tracked […]
Obstruction and starvation associated with plastic ingestion in a Northern Gannet Morus bassanus and a Greater Shearwater Puffinus gravis
Northern Gannet (Morus bassanus) Science Article 1 abstract Plastic ingestion by seabirds is well documented (see Laist 1997for a list of species with ingestion records). However, casesdefinitively attributing seabird mortality to ingestion of plastic arerare. Seabirds that die from ingestion often suffer obstruction of thegastrointestinal tract. Ultimately, the birds die of starvation andoften quickly sink […]
Nightjar Caprimulgus europaeus and Woodlark Lullula arborea – recovering species in Britain?
Nightjar (Caprimulgus europaeus) Science Article 2 abstract The Nightjar Caprimulgus europaeus and Woodlark Lullula arborea are identified as species of conservation concern at both a UK and a European level on account of historical declines in their population sizes and ranges. The UK populations of both species have increased significantly in recent decades and this […]
What effects do walkers and dogs have on the distribution and productivity of breeding European Nightjar Caprimulgus europaeus?
Nightjar (Caprimulgus europaeus) Science Article 1 abstract Several successive studies of European Nightjars Caprimulgus europaeus (hereafter, Nightjar) on the Dorset heaths demonstrated negative effects of the proximity of urban development and associated disturbance from access on foot by people and dogs. Surrogate measures of human density and settlement, including the amount of developed land around […]
Ecological Functions and Economic Value of the Neotropic Cormorant (Phalacrocorax brasilianus) in Los Olivitos Estuary, Venezuela
Neotropic Cormorant (Phalacrocorax brasilianus) Science Article 2 abstract We determined the ecological function and economic value of a colony of piscivorous Neotropic Cormorants at the Los Olivitos Wildlife Refuge and Fisheries Reserve (WRFR), Lake Maracaibo, Venezuela. Colony size increased from 17,000 to approximately 40,000 in two years. Lake Maracaibo supports one of the most productive […]
Primeiro registro de Syncuaria squamata (Linstow) (Nematoda, Acuariidae) embiguas, Phalacrocorax brasilianus (Gmelin) (Aves, Phalacrocoracidae) no Brasil
Neotropic Cormorant (Phalacrocorax brasilianus) Science Article 4 abstract First record of Syncuaria squamata (Linstow) (Nematoda, Acuariidae) in Neotropical cormorants Phalacrocorax brasilianus (Gmelin) (Aves, Phalacrocoracidae) in Brazil. The nematodes of the genus Syncuaria Gilbert, 1927 are parasites of birds of the orders Pelecaniformes, Ciconiiformes, and Podicipediformes. Eleven species are considered valid in this genus, however, two […]
Contracaecum rudolphii Hartwich (Nematoda, Anisakidae) from the Neotropical Cormorant, Phalacrocorax brasilianus (Gmelin) (Aves, Phalacrocoracidae) in southern Brazil
Neotropic Cormorant (Phalacrocorax brasilianus) Science Article 3 abstract The present report is part of a larger study on the helminth fauna of Neotropical Cormorants,Phalacrocorax brasilianus (Gmelin, 1789) in Brazil, particularly, in the southernmost State of Rio Grande do Sul. Thenematodes which were found loose in the proventriculus/ventriculus or in groups of adults of different ages […]
ASPECTS OF THE BREEDING BIOLOGY OF THE NEOTROPIC CORMORANT PHALACROCORAX OLIVACEUS AT GOLFO SAN JORGE, ARGENTINA
Neotropic Cormorant (Phalacrocorax brasilianus) Science Article 1 abstract We studied the breeding biology of Neotropic Cormorants Phalacrocorax olivaceus at Golfo San Jorge, Argentina,during 1999. A total of 104 nest platforms with signs of occupation was counted, at 66 (63.5%) of whicheggs were laid. Nests were built on top of medium to large bushes located up […]