0000006940 00000 n Here, we explored environmental correlates of taxonomically-based and traits-based compositional distances using a comprehensive data set of diatom and macroinvertebrate communities. This paper illustrates how parasitological studies on Salvelinus species can contribute to the understanding of northern lake ecology and fish foraging behaviour. Another freshwater ecosystem that is extremely important in helping to purify sources of water is that of Riparian forests or, more specifically, Riparian forest buffers. UN Environment has developed a publication series entitled ‘A Framework for Freshwater Ecosystem … Cover photo: River Ahr near Ahrbrück (Photo: B. Engels, BfN Authors’s addresses: Prof. Volkmar Hartje Berlin University of Technology Dr. Axel Klaphake Department on Landscape Economics Sekr. We analysed variation in total β‐diversity and its replacement and richness difference components in relation to location of the river reach and its drainage basin (Baltic Sea in the south, the Barents Sea in the east and the north, and the Norwegian Sea in the west), in addition to climate and environmental variables. forecasted before the analysis. Environmental conditions in high-latitude catchments are also severe and natural variation is high. freshwater ecosystem of the Basin (Junk, 1993; Beighley & Gummadi, 2011). 0000008146 00000 n (Adapted from Hooper et al. The metrics of diversity provided information on species richness and composition across hydrobasins, ecoregions, and Arctic zones. Climate change adaptation and mitigation strategies customised for rapidly changing northern ecosystems will play an essential role in preserving ecologically unique northern species. However, information gaps in space, time, and among taxonomic groups remain. 0000006260 00000 n Heterogeneity of habitats, environmental gradients, and geographic distance probably contributed to patterns of fish dissimilarity within and across ecoregions. Print Book & E-Book. A climate change, resulting in more snowfall in the whole alpine region of West Norway, as predicted by climate models, may therefore have an important negative effect on fish production and fisheries in a whole region. The types of organisms that might be found in each ecosystem will be different based on the kind of habitat you are looking in; there may be frogs in ponds, trout in streams, otters in rivers, and ducks in lakes, but these animals will not be found in the others’ habitats. PDF | On Dec 1, 2013, F. Wrona and others published Freshwater Ecosystems | Find, read and cite all the research you need on ResearchGate To generate measures of niche position and niche breadth for each species, we used sets of local environmental and catchment variables separately, applying the outlying mean index analysis. in ponds with different dissolved organic carbon (DOC) concentrations. Diatom assemblages were assessed using information from ongoing regulatory monitoring programmes, individual research projects, and from surface sediment layers obtained from lake cores. Our results indicated that both taxonomically and traits-based approaches are still needed to better understand patterns and mechanisms affecting the organization of biological communities in streams. Growth of brown trout in the alpine lake Litlosvatn, 1172 m a.s.l. Yellow bars indicate the number of ponds where waterfleas are absent and the black bar the number of ponds with waterfleas. There was no significant difference in β‐diversity between the three main drainage basins, but species composition differed among the drainage basins. Freshwater ecosystems such as wetlands, rivers, and lakes are indispensable for life on our planet and vital for directly ensuring a range of benefits and services fundamental to the environment, society and the economy. Since they record their own history in mineral and organic sediments, their roots can be traced deep into the past. Characteristics of Aquatic Ecosystems Factors that determine where organisms live in the water include: •Temperature •Sunlight •Oxygen •Nutrients Ex.) • Warming temperatures increased overall community richness and abundance but produced differing responses at the species level. Protected area management, freshwater conservation is central to sustaining biodiversity including small thermokarst ponds large... 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