Indigo Bunting (Passerina cyanea) Science Article 5 abstract Recent years have seen the accumulation of many useful quan- titative and qualitative data pertaining to weight and fat in migratory birds. Most investigations of this nature have thus far dealt with birds breeding and overwintering on north temperate land masses, but few quantitative data pertaining to […]
THE EFFECTS OF PATCH SHAPE ON INDIGO BUNTINGS: EVIDENCE FOR AN ECOLOGICAL TRAP
Indigo Bunting (Passerina cyanea) Science Article 1 abstract Habitat loss and fragmentation have led to a widespread increase in the proportion of edge habitat in the landscape. Disturbance-dependent bird species are widely assumed to benefit from these edges. However, anthropogenic edges may concentrate nest predators while retaining habitat cues that birds use to select breeding […]
Gelegegrosse und Bruterfolg des Schreiadlers (Aquila pomarina) und des Kaiseradlers (Aquila heliaca) in den ostslowakischen Karpaten 1966-1978
Imperial Eagle (Aquila heliaca) Science Article 1 abstract Seit langerer Zeit widmen wir uns dem Studium der Greifvogel in der Ostslowakei. Dabei konnten wir in dreizehn aufeinanderfolgenden Beobachtungsjahren u.a. 65 Bruten des Schreiadlers und 28 des Kaiseradlers kontrollieren. Fur beide Arten liegen uber Gelegegro
On the taxonomic status and denomination ofthe Iberian Chiffchaffs
Iberian Chiffchaff (Phylloscopus ibericus) Science Article 1 abstract We carried out a Principal Component Analysis on 196 Iberian and Common Chiffchaffsof both sexes (live and collection specimens), characterized by seven variables derived fromwing, tarsus and bill measures. This method, complemented by colour comparison of thetaxa, led us to the following conclusions. (1)Phyllopneuste brehmii, Homeyer, 1871, […]
Hudsonian Godwit Limosa haemastica migration insouthern Argentina
Hudsonian Godwit (Limosa haemastica) Science Article 1 abstract Among all animals, the Hudsonian Godwit Limosa haemastica is one of the champion migrants. In spite of this recognition, or perhaps because of it, there is little understanding of how this northern-nesting bird completes its migrations between arctic breeding areas ofCanada and Alaska, and its winter habitats […]
An Incident of Female-Female Aggression in the House Wren
House Wren (Troglodytes aedon) Science Article 5 abstract AIn this paper we describe one example of female-female aggression in the House Wren (Troglodytes aedon). An intruding female usurped the resident female and paired with the resident male. House Wrens are known for committing infanticide as well as puncturing and removing eggs of conspecifics and other […]
Skeletal Development at the Time of Fledging in House Wrens
House Wren (Troglodytes aedon) Science Article 1 abstract We examined skeletal development at the time of first flight in House Wrens (Troglodytes aedon) as one step in assessing whether calcium availability limits nestling growth in this species. Young wrens begin flying with about 49 mg of calcium in their skeletons, 30% less calcium than is […]
NESTING BEHAVIOR OF THE SOUTHERN HOUSE WREN IN SURINAM
House Wren (Troglodytes aedon) Science Article 3 abstract The range of the Southern House Wren (Troglodytes musculus) isvery large, as the species occurs from the tropical coastal zone of eastern Mexico and the Lesser Antilles southward to Argentina, Chile, and the Falkland Islands. In Surinam the bird is well known as the Gado fowroe (God […]
GENETIC DIFFERENTIATION AND TAXONOMY INTHE HOUSE WREN SPECIES GROUP
House Wren (Troglodytes aedon) Science Article 4 abstract The current taxonomic status of the Trogliodytes aedon (House Wren) species group was evaluated by examining levels and patterns of isozyme differentiation. Traditionally,three major taxonomic groups of continental House Wrens have been recognized: (1) aedon (Northern House-Wren); (2) brunneicollis (Brown-throated Wren); and (3) musculus (Southern House-Wren). The […]
SEASONAL MIGRATION AND GENETIC POPULATIONSTRUCTURE IN HOUSE WRENS
House Wren (Troglodytes aedon) Science Article 2 abstract Neotropical migrant birds have undergone significant changes in population size, due in part to alterations in the landscape in their breeding range. Some alterations have resulted in the isolation of areas containing optimal habitat for breeding. Isolation between habitat fragments could reduce gene flow between populations, which […]