Suchergebnisse

Ziel der 1990 initiierten Schwarzmeer-Wirtschaftskooperation (SMWR) ist die Förderung wirtschaftlichen Wachstums sowie die Gewährleistung von Stabilität und Frieden in der Schwarzmeerzone. Darüber hinaus sollen die Kooperation und Handelsbeziehungen mit Nichtmitgliedstaaten und anderen regionalen Bündnissen verstärkt werden. Wenngleich die regionale Wirtschaftskrise, Konflikte zwischen den Mitgliedstaaten und fehlende Mechanismen zur Durchsetzung beschlossener Maßnahmen bislang die effektive Arbeit der SMWR behindern, stellt die Gemeinschaft dennoch einen potentiell bedeutenden Faktor in der Schwarzmeerzone dar. (BIOst- Mrk)

Abstract
ContextThe ring-necked pheasant (Phasianus colchicus) has experienced considerable population declines in recent decades, especially in agricultural environments of the Central Valley of California. Although large-scale changes in land cover have been reported as an important driver of population dynamics, the effects of microhabitat conditions on specific demographic rates (e.g. nesting) are largely unknown.
AimsOur goal was to identify the key microhabitat factors that contribute to wild pheasant fitness by linking individual-level selection of each microhabitat characteristic to the survival of their nests within the California Central Valley.
MethodsWe radio- or GPS-marked 190 female ring-necked pheasants within five study areas and measured nest-site characteristics and nest fates during 2013–2017. Specifically, we modeled microhabitat selection using vegetation covariates measured at nest sites and random sites and then modeled nest survival as a function of selecting each microhabitat characteristic.
Key resultsFemale pheasants tended to select nest sites with greater proportions of herbaceous cover and avoided areas with greater proportions of bare-ground. Specifically, perennial grass cover was the most explanatory factor with regard to nest survival, but selection for increasing visual obstruction alone was not shown to have a significant effect on survival. Further, we found strong evidence that pheasants selecting sites with greater perennial grass height were more likely to have successful nests.
ConclusionsAlthough pheasants will select many types of vegetation available as cover, our models provided evidence that perennial grasses are more beneficial than other cover types to pheasants selecting nesting sites.
ImplicationsFocusing management actions on promoting perennial grass cover and increased heights at the microsite level, in lieu of other vegetative modifications, may provide improved quality of habitat for nesting pheasants and, perhaps, result in increased productivity. This is especially important if cover is limited during specific times of the nesting period. Understanding how microhabitat selection influences fitness can help land managers develop strategies to increase the sustainability of hunted populations of this popular game-bird species.