Influences of the season and the habitat structure on the foraging ecology of two coua species in the western dry forest of Madagascar.
I studied the foraging ecology of Coquerel's Coua (Coua coquereli) and Giant Coua (Coua gigas), which occur in the dry forest in west Madagascar. This kind of forest is characterised by an alternating of a dry and a rainy season. The foraging behaviour was described in several dimensions: i.e. height and proportion of perching, rate of capture (estimating the food availability), foraging techniques, substrates used, type and size of the captured prey. Their foraging behaviour was different according to the season and to the proximity of water. Habitat structure was important to take in consideration to study their foraging behaviour. They tended to use the same pattern of techniques and substrates, but differed by the proportions they used these variables and also by the possibility to climb into the dense understorey vegetation. Seasonal variation has probably an important effect on the prey availability and the nature of prey captured. The diet of both species is also discussed. I suggest that change in habitat structure and resources levels could be important to take in consideration for the conservation of these forest birds.
Chouteau
Philippe
P
Laboratoire d'Ecologie, Ecole Normale Supérieure, 46, rue d'Ulm, 75230 Paris cedex 05, France. philippe.chouteau@numericable.fr
D000818:Animals; D001522:Behavior, Animal; D001717:Birds / Q000502:physiology*; D003247:Conservation of Natural Resources; D004463:Ecology; D004777:Environment; D008270:Madagascar; D011235:Predatory Behavior; D012621:Seasons; D014197:Trees