Freshwater Biology
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A stable isotope study of linkages between stream and terrestrial food webs through spider predationSUMMARY 1. Transfer of carbon from freshwater to terrestrial ecosystems can occur through predation on adult aquatic insects, but the significance of this trophic pathway to the energetics of riparian communities is poorly understood. We used stable isotopes of carbon and nitrogen to explore linkages between aquatic insect production and the nutrition of web‐building...
Freshwater Biology - Tập 47 Số 9 - Trang 1651-1659 - 2002
Habitat utilization by sympatric arctic charr Salvelinus alpinus L. and brown trout Salmo trutta L. in Lake Atnsjø, south‐east NorwaySUMMARY. 1. Habitat utilization, as well as inter‐ and intraspecific relations of different size groups of arctic charr (Salvelinus alpinus (L.)) and brown trout (Salmo trutta L.) in Lake Atnsjø, south‐east Norway, were investigated by analysing food and spatial niches from monthly benthic and pelagic gillnet cat...
Freshwater Biology - Tập 22 Số 1 - Trang 143-152 - 1989
Extracellular phosphatases in a Mediterranean reservoir: seasonal, spatial and kinetic heterogeneitySummary 1. Epilimnetic alkaline phosphatase activity (APA) was measured in longitudinal profiles of the canyon‐shaped, eutrophic Sau Reservoir (Catalonia, Spain) during the autumn, winter and spring periods of 1997–2000. 2. The spatial pattern of APA depended on lake circulation. During periods of stable stratification, when the ratio of mixed to eup... ... hiện toàn bộ
Freshwater Biology - Tập 51 Số 7 - Trang 1264-1276 - 2006
The ecological limits of hydrologic alteration (ELOHA): a new framework for developing regional environmental flow standardsSummary 1. The flow regime is a primary determinant of the structure and function of aquatic and riparian ecosystems for streams and rivers. Hydrologic alteration has impaired riverine ecosystems on a global scale, and the pace and intensity of human development greatly exceeds the ability of scientists to assess the effects on a river‐by‐river basis. Current scient... ... hiện toàn bộ
Freshwater Biology - Tập 55 Số 1 - Trang 147-170 - 2010
Assessing the consistency of response metrics of the invertebrate benthos: a comparison of trait‐ and identity‐based measuresSummary 1. The use of species traits to interpret biological changes in invertebrate assemblages across environmental gradients has been suggested as a method to improve discrimination over existing species composition methods. One reason for greater potential discrimination and predictive ability is the assumed universality of traits across a range of spatial and t... ... hiện toàn bộ
Freshwater Biology - Tập 55 Số 7 - Trang 1420-1429 - 2010
Macroinvertebrate community structure along gradients of hydraulic and sedimentary conditions in a large gravel‐bed river1. The spatial distribution of macroinvertebrate species was examined in relation to hydraulic and sedimentary conditions in a large gravel‐bed river, the Fraser River, Canada. Mean annual discharge in the Fraser River is 2900 m3 s−1 and annual flood discharge, due to snowmelt in May and June, averages 8760 m3 s−1.
2. Invertebrates were sampled from four water depths (0.2, 0.5, 1.5, 3.0 m... ... hiện toàn bộ
Freshwater Biology - Tập 45 Số 1 - Trang 57-73 - 2000
Large‐scale relationships between basin and riparian land cover and the ecological status of European riversSummary 1. The main objectives of our study were (i) to establish the relative impact of pressures that degrade ecological status, especially those caused by agriculture and urbanisation, (ii) to identify regional patterns in these pressure‐impact relationships and (iii) to evaluate the relative weight of the pressures acting at the basin and riparian corridor scale... ... hiện toàn bộ
Freshwater Biology - Tập 55 Số 7 - Trang 1465-1482 - 2010
Stream macroinvertebrate occurrence along gradients in organic pollution and eutrophicationSummary 1. We analysed a large number of concurrent samples of macroinvertebrate communities and chemical indicators of eutrophication and organic pollution [total‐P, total‐N, NH4 –N, biological oxygen demand (BOD5 )] from 594 Danish stream sites. Samples were taken over an 11‐year time span as part of the Danish monitoring pr... ... hiện toàn bộ
Freshwater Biology - Tập 55 Số 7 - Trang 1405-1419 - 2010
Multiple stressors in freshwater ecosystemsSummary 1. The fundamental importance of freshwater resources, the rapid extinction rate among freshwater species and the pronounced sensitivity of freshwater ecosystems to climate change together signal a pre‐eminent need for renewed scientific focus and greater resources. Against this background, the Freshwater Biological Association in 2008 launched a new series ... ... hiện toàn bộ
Freshwater Biology - Tập 55 Số s1 - Trang 1-4 - 2010
Scale‐dependent effects of fine sediments on temperate headwater invertebratesSummary 1. Anthropogenic activities can increase fine sediment supply to streams over multiple spatial and temporal extents. Identifying the processes responsible, and the scale at which any effects on stream organisms become evident, are key management needs, but appropriately scaled surveys are surprisingly few. 2. We surveyed macroinvertebrates an... ... hiện toàn bộ
Freshwater Biology - Tập 54 Số 1 - Trang 203-219 - 2009
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