Találati lista | Tudóstér

001-es BibID:	BIBFORM013407
Első szerző:	Pap Péter László (ökológus)
Cím:	Seasonality in the uropygial gland size and feather mite abundance in house sparrows Passer domesticus: natural covariation and an experiment. / Péter L. Pap, Csongor I. Vágási, Gergely Osváth, Cosmin Mureşan, Zoltán Barta
Dátum:	2010
Megjegyzések:	The seasonal change, i.e. the marked differences between seasons of low and high productivity, in the abundance ofectosymbionts and the defence intensity of the host against pathogens is a well defined characteristic of temperate zoneorganisms. Here we investigate the seasonal variation in the uropygial gland size and the abundance of Proctophyllodesfeather mites on the wing feathers of house sparrows Passer domesticus in two breeding populations. The size of theuropygial gland varied significantly in male and female house sparrows over the annual cycle. The gland was small duringthe non-breeding and mating season, after that it started to grow sharply, reaching its maximum size during breeding.Females had larger gland volumes than males during breeding, and the increase in gland size during breeding was morepronounced in females than in males. The number of feather mites was the lowest during breeding, followed by anincrease during moult and reaching its maximum between the wintering and mating seasons. The absence of a significantrelationship between the uropygial gland size and the abundance of feather mites, after controlling for potentialconfounding variables, supports the view that gland oils do not regulate the number of mites. To investigate further thishypothesis, through a full factorial experimental design we tested the effect of uropygial gland and photoperiodmanipulation on the population size and population dynamics of feather mites. The manipulation of uropygial gland hadno effect on mites, supporting our observational results. As a result of the experimentally increased day-length, theabundance of feather mites on wing feathers decreased significantly and more sharply than in the control group,supporting the previous anecdotal evidence about the photosensitivity of these organisms. Using photoperiodic cues,feather mites may respond to seasonal changes that affect their life-history and population dynamics.
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:	Journal of Avian Biology. - 41 : 6 (2010), p. 653-661. -
További szerzők:	Vágási Csongor István Osváth Gergely (1985-) (biológus) Mureşan, Cosmin Barta Zoltán (1967-) (biológus, zoológus)
Internet cím:	DOI Intézményi repozitóriumban (DEA) tárolt változat
Borító:
Saját polcon: