Little Blue Heron (Egretta caerulea) Science Article 1 abstract The breeding biology of Little Blue Herons (Egretta caerulea) nesting in Santos-Cubatao, southeastern Brazil, was studied during the 1997 (75 monitored nests) and 1998 (65 nests) breeding seasons in one colony (Saboo River), and during the 1997 season (58 nests) in another colony nearby (Morrao River). […]
Category: North America
Breeding biology of the Great Grey Shrike (Lanius excubitor): an analysis of nest record cards
Northern Shrike (Lanius excubitor) Science Article 2 abstract The aim of the study was to present variability in nest and breeding parameters of the Great Grey Shrike in Poland. We analyzed 83 nest record cards. Most data were recorded in 1982-2002. The analyzed parameters included: nest location, nest height, nest structure, breeding phenology, clutch size, […]
The breeding population of the Great Grey Shrike (Lanius excubitor) in Austria, 1995-2003
Northern Shrike (Lanius excubitor) Science Article 1 abstract Since the 1980s, the breeding range of the Great Grey Shrike in Austria has been restricted to the northern part of Lower Austria. Since 1995, this breeding population has been fully censused to obtain base-line population levels. Every breeding locality was examined 6-8 times each season. In […]
Research activity induces change in nest position of the Great Grey Shrike Lanius excubitor
Northern Shrike (Lanius excubitor) Science Article 11 abstract The Great Grey Shrike Lanius excubitor, as well as other species of family Laniidae, recognise humans as potential predators and actively defend nests. During an intensive study in western Poland we examined the influence of observer visits on breeding success and breedingbehaviour of the Great Grey Shrike. […]
Predation in a salt marsh Laughing Gull colony
Laughing Gull (Leucophaeus atricilla) Science Article 7 abstract As an apparent consequence of predation pressures many colonial seabirds nest in places inaccessible to terrestrial animals (e.g. Crook and GossCustard 1972). In many parts of their breeding range along the Atlantic and Gulf coasts ooe North America Laughing Gulls (Larus atticilia) nest on salt marsh islands, […]
Responses of nesting common terns and laughing gulls to flyovers by large gulls
Laughing Gull (Leucophaeus atricilla) Science Article 4 abstract Disturbance can reduce productivity by disrupting nesting behavior. We examined responses of nesting Common Terns (Sterna hirundo) and Laughing Gulls (Larus atricilla) to frequent overhead flights by Herring (L. argentutus) and Great Black-backed (L. murinus) gulls to determine if such flyovers may have contributed to declines in […]
Laughing gulls (Larus atricilla) and black skimmers (Rynchops nigra) brought to Newfoundland by hurricane
Laughing Gull (Leucophaeus atricilla) Science Article 6 abstract Sea-birds from the West Indies and nearby subtropical regions occasionally occur in New England and the Maritime Provinces of Canada as a result of hurricanes. Peterson (1947) lists three species, the Sooty Tern (Sterna fuscata) and the Noddy (Anous stolidus) which breed at Dry Tortugas and the […]
aerial Photography Techniques to Estimate Populations of Laughing Gull Nests in Jamaica Bay, New York, 1992-1995
Laughing Gull (Leucophaeus atricilla) Science Article 8 abstract We evaluated aerial photography (full coverage, using fixed-wing aircraft) and aerial video (transects, using helicopter) surveys to estimate the population of Laughing Gull (Larus ahicilla) nests in Jamaica Bay, New York, during June 1992-1995. We counted 4,920 nests in the colony using aerial photography and estimated 5,367 […]
Brown pelican foraging success and kleptoparasitism by laughing gulls
Laughing Gull (Leucophaeus atricilla) Science Article 9 abstract Previous studies have shown age-related differences in feeding success for a number of bird species, particularly those found in marine environments. We compared the foraging success of adult and immature Brown Pelicans (Pelecanus occidentalis) feeding along the Playa Miramar northwest of Manzanillo, Colima, Mexico. On many of […]
Phylogenetic Diversity and Molecular Detection of Bacteria inGull Feces
Laughing Gull (Leucophaeus atricilla) Science Article 5 abstract In spite of increasing public health concerns about the potential risks associated with swimming inwaters contaminated with waterfowl feces, little is known about the composition of the gut microbialcommunity of aquatic birds. To address this, a gull 16S rRNA gene clone library was developed andanalyzed to determine […]