Houbara Bustard (Chlamydotis undulata) Science Article 4 abstract Houbara Bustard Chlamydotis undulata macqueenii is reportedly declining rapidly in all the range states and its population believed to be much less now than some 10-12 years ago (Goriup, 1997). Rough estimates of the declining rates from causal observations in different parts of Balochistan indicate a declining […]
Human activities affect the potential distribution of the Houbara Bustard Chlamydotis undulata undulata
Houbara Bustard (Chlamydotis undulata) Science Article 3 abstract Human activities have been reported to impinge on the distribution of the endangered Houbara Bustard Chlamydotis undulata undulata. The present study intends to investigate spatial relationships between Bustard and pastoral distribution in order to identify avoidance patterns and potential exclusions of the species from still-suitable grounds.The study […]
ASPECTS OF THE BIOLOGY OF THE HORNED SCREAMER IN SOUTHWESTERN COLOMBIA
Horned Screamer (Anhima cornuta) Science Article 1 abstract An isolated population of the Homed Screamer (Anhima cornuta) in the Cauca Valley, Colombia, was studied intensively during 1983-1984. Variation of head plumage allowed me to identify individuals. This group of approximately 25 adults is the only breeding population of the species in southwestern Colombia. Home ranges […]
Recording of Hoopoes Upupa epops by means of audio playback in the conditions of Latvia: a preliminary evaluation
Hoopoe (Upupa epops) Science Article 1 abstract Playback is often used to improve recording of birds and therefore to gain more precise data on their numbers and distribution. The aim of this study was to evaluate the potential suitability of this method for survey of Hoopoes Upupa epops in Latvia. Playback was carried out in […]
FEEDING HABITS AND BILL POLYMORPHISM IN HOOK-BILLED KITES
Hook-billed Kite (Chondrohierax uncinatus) Science Article 1 abstract The Hook-billed Kite (Chondrohieraxu ncinatus),a neotropical, snail-eating raptor, exhibits extraordinary intraspecific variation in bill size, which is unrelated to sex and age and is largely independent of geographic origin. Bill size varies much more than overall body size and is bimodally distributed in many parts of the […]
Modelling and mapping potential hooded warbler (Wilsonia citrina)habitat using remotely sensed imagery
Hooded Warbler (Wilsonia citrina) Science Article 1 abstract Modelling and mapping of hooded warbler (Wilsonia citrina) nesting habitat in forests of southern Ontario were conducted using Ikonos and Landsat data. The study began with an analysis of skyward hemispherical photography to determine canopy characteristics associated with nest sites. It showed that nest sites had significantly […]
HABITAT SEGREGATION BETWEEN THE SEXES OF WINTERING HOODED WARBLERS (WILSONIA CITRINA)
Hooded Warbler (Wilsonia citrina) Science Article 3 abstract Overwintering male and female Wilsonia citrina defended exclusive feeding territories in the Yucatan Peninsula, Mexico. Woody vegetation ranging from successional scrub to tall evergreen forest was utilized by the species, but males were most abundant in closed-canopy forest of moderate to tall stature, while females were commonest […]
Fledgling Adoption in Hooded Warblers (Wilsonia citrina): Does Extrapair Paternity Play a Role?
Hooded Warbler (Wilsonia citrina) Science Article 4 abstract Adoption is a widespread phenomenon in birds and generally occurs at a low frequency within a species (reviewed in Rohwer 1986, Meek and Robertson 1991). Adoption of fledglings is common in seabirds due to the mobility of chicks soon after hatch. BRIDGET J .STUTCHBURY, The Auk 113(1):218-220, […]
Do male Hooded Warblers guard their mates when theirpaternity is most at risk?
Hooded Warbler (Wilsonia citrina) Science Article 5 abstract Males of socially monogamous species may benefit from using behavioral tactics to ensure their paternity of the young produced by their social mates. We tested whether male Hooded Warblers (Wilsonia citrina) use mate guarding and high song output in an attempt to prevent extra-pair copulations (EPC) by […]
SURVIVAL OF FLEDGLING HOODED WARBLERS (WILSONIA CITRINA) INSMALL AND LARGE FOREST FRAGMENTS
Hooded Warbler (Wilsonia citrina) Science Article 2 abstract Studies on the effects of forest fragmentation on the reproductive ecology of forest songbirds have focused almostexclusively on the egg and nestling stages. Little is known about survival or habitat use of fledglings in their first weeks out of the nest.Weradiotracked adult HoodedWarblers (Wilsonia citrina) attending fledglings […]