Lesser Spotted Eagle (Aquila pomarina) Science Article 5 abstract Greater and lesser spotted eagles (Aquila clanga, A. pomarina) are two closely related forest eagles overlapping in breeding range in east-central Europe. In recent years a number of mixed pairs have been observed, some of which fledged hybrid young. Here we use mitochondrial (control region) DNA […]
Zum Kainismus beim Schreiader Aquila pomarina
Lesser Spotted Eagle (Aquila pomarina) Science Article 2 abstract Detailed observations were made of Cainism in a Lesser Spotted Eagle’s (LSE) nest, whereby this procedure generally leads to the death of the second chick a few days after hatching. The time-lapse between hatchings amounted to two and a half days (60 hours). At the time […]
The Situation of the Lesser Spotted Eagle Aquila pomarina in Germany: The need for an Action Plan and active Conservation
Lesser Spotted Eagle (Aquila pomarina) Science Article 3 abstract Since about 1800 the total breeding area of the Lesser Spotted Eagle Aquila pomarina in Germany has shrunk by some 90 % from a then 83,000 km2 to a small residual area today of some 10,000km2. The western border of the breeding range has shifted several […]
Productivity and diet of lesser spotted eagle (Aquila pomarina) in Lithuania in 2001-2003
Lesser Spotted Eagle (Aquila pomarina) Science Article 1 abstract In 2001-2003, the data on the productivity and diet of Lesser Spotted Eagle (Aquila pomarina) were collected in Central, Northern and Eastern parts of Lithuania. Though during the mentioned period productivity varied greatly, mean productivity of 0.61 was very similar to that more than 10 years […]
Predicted and observed migration speed in Lesser Spotted Eagle Aquila pomarina.
Lesser Spotted Eagle (Aquila pomarina) Science Article 6 abstract Satellite telemetry has recently been used to track the migration of eight Lesser Spotted Eagles Aquilla pomarina and one Spotted Eagle A. clanga (Meyburg et al. 1993, 1995a and b). I used aerodynamic theory to predict the overall migration speed in these eagles using either thermal […]
Seasonal and interannual variability in laying date, clutch size, egg volume and hatching asynchrony of four lark species in Mediterranean Spain
Lesser Short-toed Lark (Calandrella rufescens) Science Article 2 abstract To describe the variation in laying date, clutch size, egg volume and hatching asynchrony of four lark species (Skylark Alauda arvensis, Short-toed Lark Calandrella brachydactyla, Thekla Lark Galerida theklae and Lesser Short-toed Lark Calandrella rufescens) and at two different time scales: between years (large-scale variation), and […]
Parental body mass changes during the nestingstage in two Lark species in a semi-arid habitat
Lesser Short-toed Lark (Calandrella rufescens) Science Article 1 abstract Parental body mass changes during the nesting period were analysed for Thekla Larks,Galerida theklae, and Lesser Short-toed Larks, Calandrella rufescens. Body mass of femaleThekla Larks declines from the start of incubation until the chicks fledge; laying date,interpreted as the number of renesting attempts, also has a […]
BEHAVIOR OF THE GRASSLAND SPARROW AND TWO SPECIES OF SEED-FINCHES
Lesser Seed-Finch (Oryzoborus angolensis) Science Article 1 abstract The behavior of many of the predominantly granivorous neotropical bird species cOnventionally grouped under the familial heading Fringillidae in field guides is poorly known. Documenting it may help promote a better understanding of the phylogeny and Systematics of these birds and clarify the evolution and adaptive significance […]
Geographic Variation in the Juvenal Plumage of the Lesser Nighthawk (Chordeiles acutipennis)
Lesser Nighthawk (Chordeiles acutipennis) Science Article 1 abstract In attempting to identify a series of Lesser Nighthawks (Chordeiles acutipennis) collected on the Pacific lowlands of Guatemala, and to ascertain the applicable trinomial to use, I encountered a striking degree of variation among juveniles in the collection of the American Museum of Natural History (AMNH). To […]
Nesting of Lesser Nighthawks on beaches in El Salvador
Lesser Nighthawk (Chordeiles acutipennis) Science Article 2 abstract Distribution of the Lesser Nighthawk (Chordeiles acutipennis) in northern Central America is poorly understood (Howell and Webb 1995). We here present the first documentation of breeding for the species in El Salvador, as well as the hrst documentation of breeding in association with terns and plovers. On […]