Auteurs: Hinsley Shelley A., Hill Ross A., Bellamy Paul, Broughton Richard K., Harrison Nancy M., Mackenzie Julia A., Speakman John R., Ferns Peter N.
Bron: Landscape Research Oct2009, Vol. 34 Issue 5, p509-526
Abstract: Demands on land use in heavily populated landscapes create mosaic
structures where semi-natural habitat patches are generally small and
dominated by edges. Small patches are also more exposed and thus more
vulnerable to adverse weather and potential effects of climate change.
These conditions may be less problematic for generalist species than for
specialists. Using insectivorous woodland birds (great tits and blue
tits) as an example, we demonstrate that even generalists suffer reduced
breeding success (in particular, rearing fewer and poorer-quality
young) and increased parental costs (daily energy expenditure) when
living in such highly modified secondary habitats (small woods, parks,
farmland). Within-habitat heterogeneity (using the example of Monks Wood
NNR) is generally associated with greater species diversity, but to
benefit from heterogeneity at a landscape scale may require both high
mobility and the ability to thrive in small habitat patches. Modern
landscapes, dominated by small, modified and scattered habitat patches,
may fail to provide specialists, especially sedentary ones, with access
to sufficient quantity and quality of resources, while simultaneously
increasing the potential for competition from generalists
Bron: Landscape Research Oct2009, Vol. 34 Issue 5, p509-526
Abstract: Demands on land use in heavily populated landscapes create mosaic
structures where semi-natural habitat patches are generally small and
dominated by edges. Small patches are also more exposed and thus more
vulnerable to adverse weather and potential effects of climate change.
These conditions may be less problematic for generalist species than for
specialists. Using insectivorous woodland birds (great tits and blue
tits) as an example, we demonstrate that even generalists suffer reduced
breeding success (in particular, rearing fewer and poorer-quality
young) and increased parental costs (daily energy expenditure) when
living in such highly modified secondary habitats (small woods, parks,
farmland). Within-habitat heterogeneity (using the example of Monks Wood
NNR) is generally associated with greater species diversity, but to
benefit from heterogeneity at a landscape scale may require both high
mobility and the ability to thrive in small habitat patches. Modern
landscapes, dominated by small, modified and scattered habitat patches,
may fail to provide specialists, especially sedentary ones, with access
to sufficient quantity and quality of resources, while simultaneously
increasing the potential for competition from generalists
Geen opmerkingen:
Een reactie posten