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DOI10.1111/j.1365-2427.2009.02322.x
Emerging concepts in temporary-river ecology
Larned, Scott T.1; Datry, Thibault2; Arscott, David B.1; Tockner, Klement3
通讯作者Larned, Scott T.
来源期刊FRESHWATER BIOLOGY
ISSN0046-5070
EISSN1365-2427
出版年2010
卷号55期号:4页码:717-738
英文摘要

1. Temporary rivers and streams are among the most common and most hydrologically dynamic freshwater ecosystems. The number of temporary rivers and the severity of flow intermittence may be increasing in regions affected by climatic drying trends or water abstraction. Despite their abundance, temporary rivers have been historically neglected by ecologists. A recent increase in temporary-river research needs to be supported by new models that generate hypotheses and stimulate further research. In this article, we present three conceptual models that address spatial and temporal patterns in temporary-river biodiversity and biogeochemistry.


2. Temporary rivers are characterised by the repeated onset and cessation of flow, and by complex hydrological dynamics in the longitudinal dimension. Longitudinal dynamics, such as advancing and retreating wetted fronts, hydrological connections and disconnections, and gradients in flow permanence, influence biotic communities and nutrient and organic matter processing.


3. The first conceptual model concerns connectivity between habitat patches. Variable connectivity suggests that the metacommunity and metapopulation concepts are applicable in temporary rivers. We predict that aggregations of local communities in the isolated water bodies of temporary rivers function as metacommunities. These metacommunities may become longitudinally nested due to interspecific differences in dispersal and mortality. The metapopulation concept applies to some temporary river species, but not all. In stable metapopulations, rates of local extinction are balanced by recolonisation. However, extinction and recolonisation in many temporary-river species are decoupled by frequent disturbances, and populations of these species are usually expanding or contracting.


4. The second conceptual model predicts that large-scale biodiversity varies as a function of aquatic and terrestrial patch dynamics and water-level fluctuations. Habitat mosaics in temporary rivers change in composition and configuration in response to inundation and drying, and these changes elicit a range of biotic responses. In the model, aquatic biodiversity initially increases directly with water level due to increasing abundance of aquatic patches. When most of the channel is inundated and most aquatic patches are connected, further increases in aquatic habitat and connectivity cause aquatic biodiversity to decline due to community homogenisation and reduced habitat diversity. The predicted responses of terrestrial biodiversity to changes in water level are the inverse of aquatic biodiversity responses.


5. The third conceptual model represents temporary rivers as longitudinal, punctuated biogeochemical reactors. Advancing fronts carry water, solutes and particulate organic matter downstream; subsequent flow recessions and drying result in deposition of transported material in reserves such as pools and bar tops. Material processing is rapid during inundated periods and slower during dry periods. The efficiency of material processing is predicted to increase with the number of cycles of transport, deposition and processing that occur down the length of a temporary river.


6. We end with a call for conservation and resource management that addresses the unique properties of temporary rivers. Primary objectives for effective temporary river management are preservation or restoration of aquatic-terrestrial habitat mosaics, preservation or restoration of natural flow intermittence, and identification of flow requirements for highly valued species and processes.


英文关键词Aquatic-terrestrial habitat mosaics connectivity flow intermittence meta-systems temporary rivers
类型Review
语种英语
国家New Zealand ; France ; Germany
收录类别SCI-E
WOS记录号WOS:000275676700001
WOS关键词SOUTH-EASTERN AUSTRALIA ; MEDITERRANEAN-CLIMATE STREAMS ; LEAF-LITTER DECOMPOSITION ; SONORAN DESERT STREAM ; LIFE-HISTORY TRAITS ; LAST 50 YEARS ; INTERMITTENT-STREAM ; HYPORHEIC ZONE ; INVERTEBRATE ASSEMBLAGES ; EPHEMERAL RIVERS
WOS类目Ecology ; Marine & Freshwater Biology
WOS研究方向Environmental Sciences & Ecology ; Marine & Freshwater Biology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/164199
作者单位1.Natl Inst Water & Atmospher Res, Christchurch, New Zealand;
2.Irstea, UR MALY, F-69336 Lyon, France;
3.Leibniz Inst Freshwater Ecol & Inland Fisheries, Berlin, Germany
推荐引用方式
GB/T 7714
Larned, Scott T.,Datry, Thibault,Arscott, David B.,et al. Emerging concepts in temporary-river ecology[J],2010,55(4):717-738.
APA Larned, Scott T.,Datry, Thibault,Arscott, David B.,&Tockner, Klement.(2010).Emerging concepts in temporary-river ecology.FRESHWATER BIOLOGY,55(4),717-738.
MLA Larned, Scott T.,et al."Emerging concepts in temporary-river ecology".FRESHWATER BIOLOGY 55.4(2010):717-738.
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