排序方式: 共有2条查询结果,搜索用时 31 毫秒
1
1.
Role of refugia in recovery from disturbances: Modern fragmented and disconnected river systems 总被引:10,自引:0,他引:10
James R. Sedell Gordon H. Reeves F. Richard Hauer Jack A. Stanford Charles P. Hawkins 《Environmental management》1990,14(5):711-724
Habitats or environmental factors that convey spatial and temporal resistance and/or resilience to biotic communities that
have been impacted by biophysical disturbances may be called refugia. Most refugia in rivers are characterized by extensive
coupling of the main channel with adjacent streamside forests, floodplain features, and groundwater. These habitats operate
at different spatial scales, from localized particles, to channel units such as pools and riffles, to reaches and longer sections,
and at the basin level. A spatial hierarchy of different physical components of a drainage network is proposed to provide
a context for different refugia. Examples of refugia operating at different spatial scales, such as pools, large woody debris,
floodplains, below dams, and catchment basins are discussed. We hope that the geomorphic context proposed for examining refugia
habitats will assist in the conservation of pristine areas and attributes of river systems and also allow a better understanding
of rehabilitation needs in rivers that have been extensively altered. 相似文献
2.
Anne-Sophie Bonnet-Lebrun Thomas Larsen Thorkell Lindberg Thrarinsson Yann Kolbeinsson Morten Frederiksen Tim I. Morley Derren Fox Aude Boutet Fabrice le Bouard Tanguy Deville Erpur Snr Hansen Thomas Hansen Patrick Roberts Norman Ratcliffe 《Ambio》2022,51(2):345
Climate change alters species distributions by shifting their fundamental niche in space through time. Such effects may be exacerbated by increased inter-specific competition if climate alters species dominance where competitor ranges overlap. This study used census data, telemetry and stable isotopes to examine the population and foraging ecology of a pair of Arctic and temperate congeners across an extensive zone of sympatry in Iceland, where sea temperatures varied substantially. The abundance of Arctic Brünnich’s guillemot Uria lomvia declined with sea temperature. Accessibility of refugia in cold water currents or fjords helped support higher numbers and reduce rates of population decline. Competition with temperate Common guillemots Uria aalge did not affect abundance, but similarities in foraging ecology were sufficient to cause competition when resources are limiting. Continued warming is likely to lead to further declines of Brünnich’s guillemot, with implications for conservation status and ecosystem services.Supplementary InformationThe online version contains supplementary material available at 10.1007/s13280-021-01650-7. 相似文献
1