Grey Heron (Ardea cinerea) Science Article 1 abstract The aim of this study was to estimate the importance of factors a.ecting the breeding success of the grey heron (Ardea cinerea) in three colonies in the northern Poland (Mosty and Ryback), differentiated in population size, habitat type and feeding areas used by birds. The highest mean […]
The status of the Gray Hawk in New Mexico
Grey Hawk (Buteo nitidus) Science Article 1 abstract On 23 April 1876, near Fort Bayard, Grant County, New Mexico, Frank Stephens collected two sets of eggs that he identified as those of the Gray Hawk (Buteo nitidus). Through the years this identification has been accepted without question, but my recent study of the matter suggests […]
PREDATION BY GRAY CATBIRD ON BROWN THRASHER EGGS
Grey Catbird (Dumetella carolinensis) Science Article 3 abstract The gray catbird (Dumetella carolinensis) has been documented visiting and breakingthe eggs of artificial nests, but the implications of such observations are unclear because there is little cost in depredating an undefended nest. During the summer of 2001 at Konza Prairie Biological Station, Kansas, we videotaped a […]
THE BREEDING STATUS OF THE GRAY CATBIRD IN FLORIDA
Grey Catbird (Dumetella carolinensis) Science Article 5 abstract Although Howell (1932) stated that the Gray Catbird (Dumetella carolinensis) ‘breeds sparingly in northern and central Florida,’ some recent field workers in this state have viewed his statement skeptically. Of Howell’s seven references to Florida breeding, four were made by Oscar Baynard, some of whose records of’ […]
PATTERNS OF HaeMOPROTEUS BECKERI PARASITISM IN THEGRAY CATBIRD (DUMATELLA CAROLINENSIS) DURING THEBREEDING SEASON
Grey Catbird (Dumetella carolinensis) Science Article 4 abstract We determined the prevalence and intensity of blood parasites in breeding graycatbirds (Dumatella carolinensis) at Killbuck Wildlife Area in Wayne and Holmes Counties, Ohio(USA) from June through August 2000. Of 98 catbirds sampled, 40 (40.8%) had detectableinfections of Haemoproteus beckeri. Overall prevalence of H. beckeri in this […]
Documentation of a Polygynous Gray Catbird
Grey Catbird (Dumetella carolinensis) Science Article 2 abstract Polygyny occasionally occurs in passerine species that are generally socially monogamous.We document the second case of polygynous mating in the Gray Catbird (Dumetella carolinensis) and provide the first detailed account of this behavior. Daniel Hanley et al., The Wilson Journal of Ornithology 119(3):499-502, 2007 Download article download […]
Early breeding teal Anas crecca use the best lakes and have the highest reproductive success.
Green-winged Teal (Anas carolinensis) Science Article 1 abstract Teal (Anas crecca) broods were studied in 1988-2003 in a boreal watershed comprising 51 permanent wetlands. Brood size of near-fledged ducklings was negatively related to the hatching date, i.e. early pairs had higher reproductive success than late pairs. However, brood size of newly hatched ducklings was not […]
The displays of the American green-winged teal
Green-winged Teal (Anas carolinensis) Science Article 5 abstract The displays of the European race of the Green-winged Teal (Anas crecca crecca) have been studied intensively (Lorenz, 1953, 1958; Lorenz and von de Wall, 1960; von de Wall 1963) but no detailed description has been published for the North American race (A. c. carolinensis). McKinney, F, […]
Long-term climatic trend and body size variation in teal Anas crecca
Green-winged Teal (Anas carolinensis) Science Article 3 abstract A general warming of climate in the future may profoundly affect wildlife populations in terms of numbers, distribution and characteristics of the individuals, therefore leading to new challenges in terms of management and conservation. The effects of global warming can already be detected through the analysis of […]
Wingbeat frequency and the body drag anomaly: wind-tunnel observations on a thrush nightingale (Luscinia luscinia) and a teal (Anas crecca)
Green-winged Teal (Anas carolinensis) Science Article 2 abstract A teal (Anas crecca) and a thrush nightingale (Luscinia luscinia) were trained to fly in the Lund wind tunnel for periods of up to 3 and 16 h respectively. Both birds flew in steady flapping flight, with such regularity that their wingbeat frequencies could be determined by […]