Grenada Dove

Identificazione

The Grenada dove is characterised by a white throat; face and forehead pale pink shading to dull brown on crown and nape; upperparts olive brown; underwing chestnut; neck and upper breast pink-buff fading to white on lower breast, belly and undertail coverts.

Tassonomia

Genere: Leptotila; famiglia: Columbidae; ordine: Columbiformes.

Nome scientifico

Leptotila wellsi

Autorità

(Lawrence, 1884)

Ordine

Columbiformi

Famiglia

Columbidae

Genere

Leptotila

Areale e habitat

The Grenada dove is a little-known species endemic to the main island of Grenada, West Indies. Historically, it has been recorded from locations throughout Grenada, including offshore islands, and the type specimen was collected from Fontenoy, on the west coast.<p>Some surveys imply that Grenada doves are associated with dry forest communities in the west and southwest parts of the main island (Blockstein 1988, Blockstein and Hardy 1989, Bird Life International 2000). True dry forest ecosystems are remnants of a type of xeric scrub habitat that dominated the West Indies at the end of the Pleistocene, and most areas classified as dry forest in the Caribbean are mosaics of degraded habitat, and do not represent natural ecosystems (Murphy and Lugo 1986, Vidal and Casado 2000). Beard noted the degraded nature of forested areas in Grenada in 1949.<p>Results from the Grenada Dry Forest Biodiversity Conservation Project indicate that Grenada doves are found most often in areas composed primarily of degraded mosaics of evergreen forest. The overall uniting factors in Grenada dove habitat issues are the degraded nature of the habitat and close proximity to human habitation. This is readily apparent at the Mount Hartman sanctuary, which is an old government cattle farm with vegetation composed primarily of exotic species such as Leucaena leucocephala and Heamatoxylon. Populations of doves associated with the old golf course below Jean Anglais, in the Richmond Hill Watershed, are under heavy pressure from development for private homes, and are well outside the boundaries of the Mount Hartman Sanctuary as are most Grenada doves. Mount Hartman could be considered prime cattle habitat and has been developed as such until recent times.<p>Rivera Lugo has suggested that past disturbance may have created new artificial vegetative cover types that are difficult to classify as natural forest communities. Recent classification of land cover types through satellite imagery found that Grenada's dry forest might be more appropriately considered as ecological complexes, and that there may be correlations between human influence and vegetative cover. The Rivera Lugo investigations suggest that Grenada doves are using a mixture of three seasonal forest formations: semi-evergreen forest, deciduous seasonal forest, and thorn woodlands. These categories are based on work by Beard and are applied widely throughout the Caribbean.<p>Beard considered the thorn woodland seasonal formation to be a highly degraded habitat created by heavy grazing and intensive agricultural practices. Additionally, preliminary surveys and recent census data indicate Grenada doves occur in both highly fragmented semi-urban areas and more rural environments composed sometimes of highly contrasting levels of housing and economic development. Other members of the genus Leptotila are reported to use a variety of habitats, ranging from areas associated with human disturbance, deciduous woodlands, humid forests, thickets, and semi-arid areas (Goodwin 1993).<p>Grenada doves have been documented in south-western Grenada within the Mount Hartman, Clark's Court Bay, and Richmond Hill watersheds (Blockstein 1988, Blockstein and Hardy 1989). The Mount Hartman watershed has received the greatest amount of scientific investigation and is considered by other researchers to be the representative habitat for the species (Blockstein 1988, Blockstein and Hardy 1989). Part of this watershed has been designated as a national park and is the only official national park in Grenada. Grenada doves also have been recorded from western Grenada (Blockstein 1988, Blockstein and Hardy 1989).<p>The most recent distribution census included individuals from the Beausejour, Perseverance, Woodford, and Black Bay watersheds. Part of the Perseverance watershed, adjacent to the island's new sanitary landfill and across the street from the old landfill, has been established as a Grenada dove sanctuary. This area includes a designated travel corridor to link areas of habitat on the north and south sides of the new landfill. The old landfill is currently on fire and has been burning since February 2004. An emergency landfill, which has been established to accommodate the large volume of debris created by Hurricane Ivan in early September 2004, is encroaching on the Perseverance sanctuary.

Migrazione

Specie stanziale

Comportamento

Comportamento migratorio: Specie stanziale.

Conservazione

Tendenza della popolazione: in diminuzione.

Tendenza della popolazione

in diminuzione