Evolution of the tribe Tropheini from Lake Tanganyika: synchronized explosive speciation producing multiple evolutionary parallelism; C. Rapid bioassessments of stream health using macroinvertebrates are particularly useful when information is required quickly or when a large number of sites is to be investigated. Critical examination of various bio-assessment methods revealed significant disparities in sample size and processing, taxa determination levels and criteria for assessing the quality of the results notes and predictive methods , etc. The overall balance of 14 assessed projects out of approximately 30 running projects is positive. These measures based on the reference condition approach introduce the ability to make objective comparisons throughout the Guadiana River basin, thus avoiding a priori target areas. Both the natural sequence of riffles and pools as well as anthropogenic barriers to manage the flow in such river reaches contribute to a reduction longitudinal connectivity, impede free longitu- dinal dispersion Aarts and Nienhuis, 2003. Aquatic biodiversity and saline lakes: Lake Bogoria National Reserve, Kenya; D.
Sinking properties of some phytoplankton shapes and the relation of form resistance to morphological diversity of plankton - an experimental study; J. The contribution of scientific information to the conservation and management of freshwater biodiversity in tropical Asia; D. Freshwater organisms also reflect quality of water bodies and can thus be used to monitor changes in ecosystem health. The core data table contains 1,897 records. This ensures maximum complementarity without having to set a priori target areas.
Rees, Kat Bruce, Rein Brys, David Halfmaerten, Daniel S. The volume presents a selection of contributions on aquatic biodiversity, written by colleagues from the editorial board, fellow editors of aquatic journals and former students and collaborators. As one reviewer noted, a non-impoverished system may also concentrate toxic substances. Internet Explorer 6 was released in 2001 and it does not display modern web sites properly. Grishanin Kevin Gross Grace A.
Freshwater ecology and biodiversity in the tropics: what did we learn from 30 years of onchocerciasis control and the associated biomonitoring of West African rivers? Ecosystem services is a term applied to any functional attribute of natural systems that is easily perceived by policy makers as beneficial to human society. In this age of increased fundamental and applied research on biodiversity, no single volume was as yet devoted to the various temporal and spatial aspects of aquatic biodiversity. Flow preference and reproduction ecology of river fish are closely linked. A target opinion paper lists priorities in aquatic biodiversity research for the next decade and several reactions from distinguished scientists discuss the relevance of these items from different points of view: fundamental ecology, taxonomy and systematics, needs of developing countries, present-day biodiversity policy at European and at global scales. These models are routinely applied across broad geographical areas, yet the influence of spatial extent on model performance has not been assessed directly. However, the correspondence of ecosystem health and the delivery of environmental services is poorly documented.
However, ponds provide important habitats for diverse floral and faunal communities, including a number of rare taxa of conservation interest. Stream order and stream habitat, analysed separately, each account for 61% of the total variation in total fish biomass. Dumont, scientist and editor ix Koen Martens Bibliography of Henri J. Freshwater ecology and biodiversity in the tropics: what did we learn from 30 years of onchocerciasis control and the associated biomonitoring of West African rivers? Additionally, we use a landscape measure of catchment disturbance to direct the conservation plan to the least-disturbed area while still meeting targets for the conservation of fish species used as surrogates for overall biodiversity in our study catchment, the Daly River in northern Australia. Body size and dispersal mode as key traits determining metacommunity structure of aquatic organisms.
The high number of fish species with a high degree of endemism, lack of knowledge on ecological requirements of certain fish species, absence of a complete dataset for reference conditions, and great variation among freshwater types complicate the development of fish-based indices for Turkish freshwaters. Dumont, scientist and editor; K. In addition, ordinations based on 10 replicates per sample were little different from those based on a subset of 5 or 6 of these replicates; fewer than 4 replicates did not adequately represent the patterns present in the full data set. River Listening is an interdisciplinary research project exploring the cultural and biological diversity of global river systems through the emerging field of freshwater ecoacoustics. The on which the hypothesis-testing engine must run. However, it seems probable that biotic impoverishment may lead to reduced functional capabilities, which, in this case, would mean reduced ability to transform obnoxious wastes into something less so.
However, the expected number of taxa would then become very low mean: 8. The present book is published in honour of Professor Henri Dumont Ghent, Belgium at the occasion of his retirement as Editor-in-Chief of Hydrobiologia. Restoration effect increased with the length of the restored river reaches. The number of records in each extension data table is illustrated below. Operation-related navigation impacts act on top of river regulation and engineering works to maintain fairways in the main channel.
The fish assemblages showed a longitudinal decrease in abundance and an increase in biomass, with higher values observed in the rainy season than the dry season. Böde, Arnold Móra, Robert Ptacnik, Éva Ács, Katalin Zsuga and Zsófia Horváth, Wartime scars or reservoirs of biodiversity? Lower species richness indicated a specific influence of vessel draft on fish diversity. As such, inductive descrip- bad quality www. . Separate models were constructed for 2 hierarchical extents: within ecoregions middle boreal and north boreal and across ecoregions. In the absence of zooplankton or its low concentration, the juvenile spirlin uses drift of benthic invertebrates for food. Articles in this series focus on topical research areas and linkages between basic and applied aspects of research, monitoring, policy, and education.
If a society were highly environmentally literate, it would probably accept the assertion that every ecosystem function is, in the long term, beneficial to human society. Eurytopic fishes have become dominant everywhere. When using upstream disturbance as an extra penalty, most of the network stayed intact; however, a replacement area was found for a major tributary, which only added an extra 1% of the stream network to the total area. The contribution of scientific information to the conservation and management of freshwater biodiversity in tropical Asia; D. However, we found the opposite effect for the mean body size of sedentary fish, and only positive additive effects of riparian richness for the probability of occurrence of pelagic fish. The project is currently focused around developing accessible hydrophone recording kits for remote installations, real-time listening networks, sound maps and acoustic databases.
Alternative approaches that do not rely solely on taxon occurrences but also incorporate aspects of assemblage composition might be needed for assessment of headwater streams. These results support the use of the spatial model for conservation decisions. Catchment area and stream slope were the only consistently significant predictor variables, but overall, only minor differences were found in the relative importance of catchment vs local attributes. They are related basically to longitudinal section slope of the stream bed and to the cross section of the stream and its valley. Promotional Information Springer Book Archives.