Regulated Rivers-research & Management最新文献

{"title":"The flood of the century on the River Oder: effects on the 0+ fish community and implications for floodplain restoration","authors":"A. Bischoff, C. Wolter","doi":"10.1002/RRR.612","DOIUrl":"https://doi.org/10.1002/RRR.612","url":null,"abstract":"In summer 1997, the flood of the century occurred on the River Oder in the Czech Republic, Poland and Germany. Effects of the summer flood on the 0+ fish community were evaluated at the Lower Oder in the Polish–German National Park. Fish were collected from different mesohabitats before the flood, at rising water levels and after the flood using Point Abundance Sampling by electrofishing. Flooding caused changes in local 0+ fish assemblages and partly affected the physical habitat structure. Two sandbars were formed by breaches in the dike system, replacing the former uniform river embankments. Under post-flood conditions, diversity was increased in nearly all mesohabitats. ‘Wash-out’ of 0+ fish was highest in poorly structured mesohabitats. Effects of the summer flood on eurytopic species were the most pronounced. We suggest that the progeny of rheophilic species were affected to a lesser extent by flooding because of their adaptation to variable flow conditions. Furthermore, rheophilic 0+ fish were able to colonize the newly created mesohabitats and, thus, benefited from the increased habitat heterogeneity after the flood. In this context, implications for floodplain restoration are discussed. Copyright © 2001 John Wiley & Sons, Ltd.","PeriodicalId":306887,"journal":{"name":"Regulated Rivers-research & Management","volume":"187 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131925734","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Water quality: processes and policy, edited by S.T. Trudgill, D.E. Walling and B.W. Webb, Wiley, Chichester, 1999, 283 pp. ISBN 0-47198547-3.","authors":"H. Malan","doi":"10.1002/RRR.611","DOIUrl":"https://doi.org/10.1002/RRR.611","url":null,"abstract":"","PeriodicalId":306887,"journal":{"name":"Regulated Rivers-research & Management","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131993759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The effect of a headwater dam on the use of leaf bags by invertebrate communities.","authors":"J. Casas, C. Zamora‐Muñoz, F. Archila, J. Alba-Tercedor","doi":"10.1002/1099-1646(200011/12)16:6<577::AID-RRR587>3.0.CO;2-P","DOIUrl":"https://doi.org/10.1002/1099-1646(200011/12)16:6<577::AID-RRR587>3.0.CO;2-P","url":null,"abstract":"Breakdown rates and colonisation of leaves from four tree or scrub species differing in quality are studied upstream and downstream of the Canales reservoir, a dam located in the headwater of the River Genil, Sierra Nevada, in southern Spain. This dam, with hypolimnetic release, displays short-term fluctuations of discharge and nutrient enrichment in the tailwater during the study period. Breakdown rates of the four leaf species studied do not differ between sites, despite the higher dissolved nutrient concentration in the tailwater. This lack of differences is attributed to the potentially high physical breakage of leaves during peak flows that are of higher magnitude at the upstream site. The invertebrate density in leaf bags does not differ between sites, and Chironomidae and Ephemeroptera are the numerically dominant taxa at both sites. With regard to functional feeding groups, the scarcity and lack of significant differences between sites for shredders do not match the trend predicted by the Serial Discontinuity Concept in relation to the effect of a headwater dam. Possibly, the discharge fluctuations at both sites causes excessive instability of the natural substrate (leaf litter) for the shredder guild. However, as expected, the biomass of collectors colonising leaf bags is significantly higher at the tailwater, which might be explained not in terms of quantity, but as a consequence of the higher nutritional quality of the fine particulate organic matter (FPOM) accumulated in leaf bags at this site, owing to the eutrophication caused by the dam. Despite the scarcity of functional shredders at both sites, at the community level, the leaf material is significantly more ingested at the upstream site, suggesting the importance of this source of nutrition for the trophic web at this site in contrast with the tailwater, as predicted by the Serial Discontinuity Concept. This also suggests that caution is needed in using functional feeding groups as trophic guilds to infer system-level trophic dynamics in streams, given the prevalence of generalist feeders among benthic macroinvertebrates in these environments. Copyright © 2000 John Wiley & Sons, Ltd.","PeriodicalId":306887,"journal":{"name":"Regulated Rivers-research & Management","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130643942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Riparian vegetation and channel change in response to river regulation : a comparative study of regulated and unregulated streams in the Green River Basin, USA","authors":"D. Merritt, D. Cooper","doi":"10.1002/1099-1646(200011/12)16:6<543::AID-RRR590>3.0.CO;2-N","DOIUrl":"https://doi.org/10.1002/1099-1646(200011/12)16:6<543::AID-RRR590>3.0.CO;2-N","url":null,"abstract":"The effects of river damming on geomorphic processes and riparian vegetation were evaluated through field studies along the regulated Green River and the free-flowing Yampa River in northwestern Colorado, USA. GIS analysis of historical photographs, hydrologic and sediment records, and measurement of channel planform indicate that fluvial processes and riparian vegetation of the two meandering stream reaches examined were similar prior to regulation which began in 1962. Riparian plant species composition and canopy coverage were measured during 1994 in 36, 0.01 ha plots along each the Green River in Browns Park and the Yampa River in Deerlodge Park. Detrended correspondence analysis (DCA) of the vegetation data indicates distinctive vegetation differences between Browns Park and Deerlodge Park. Canonical correspondence analysis (CCA) indicates that plant community composition is controlled largely by fluvial processes at Deerlodge Park, but that soil chemical rather than flow related factors play a more important role in structuring plant communities in Browns Park. \u0000 \u0000 \u0000 \u0000Vegetation patterns reflect a dichotomy in moisture conditions across the floodplain on the Green River in Browns Park: marshes with anaerobic soils supporting wetland species (Salix exigua, Eleocharis palustris, Schoenoplectus pungens, and Juncus nodosus) and terraces having xeric soil conditions and supporting communities dominated by desert species (Seriphidium tridentatum, Sarcobatus vermiculatus, and Sporobolus airoides). In contrast, vegetation along the Yampa River is characterized by a continuum of species distributed along a gradual environmental gradient from the active channel (ruderal species such as Xanthium struminarium and early successional species such as S. exigua, Populus deltoides subsp. wislizenii, and Tamarix ramossissima) to high floodplain surfaces characterized by Populus forests and meadow communities. GIS analyses indicate that the channel form at Browns Park has undergone a complex series of morphologic changes since regulation began, while the channel at Deerlodge Park has remained in a state of relative quasi-equilibrium with discharge and sediment regimes. The Green River has undergone three stages of channel change which have involved the transformation of the historically deep, meandering Green River to a shallow, braided channel over the 37 years since construction of Flaming Gorge Dam. The probable long-term effects of channel and hydrologic changes at Browns Park include the eventual replacement of Populus-dominated riparian forest by drought tolerant desert shrublands, and the enlargement of in-channel fluvial marshes. Copyright © 2000 John Wiley & Sons, Ltd.","PeriodicalId":306887,"journal":{"name":"Regulated Rivers-research & Management","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134257853","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Does the weight of riparian trees destabilize riverbanks","authors":"B. Abernethy, I. Rutherfurd","doi":"10.1002/1099-1646(200011/12)16:6<565::AID-RRR585>3.0.CO;2-1","DOIUrl":"https://doi.org/10.1002/1099-1646(200011/12)16:6<565::AID-RRR585>3.0.CO;2-1","url":null,"abstract":"In contrast to the generally accepted stabilizing effects of riparian vegetation, the surcharge of trees on riverbanks has been widely implicated as a source of bank instability. Fieldwork conducted along the Latrobe River in Victoria, Australia shows that the bank-destabilizing effects of surcharge, due to silver wattle (Acacia dealbata), are minimal. Field observations indicate that it is unlikely that the weight of silver wattles growing on an otherwise stable bank section will directly cause mass failure. Observations of deep-seated failures and silver wattle stands on the Latrobe River indicate that where average-sized slump-blocks support an average number of average-sized silver wattles, the trees represent only 4.1% of the total saturated slump mass. Infinite slope stability analysis indicates a threshold of around 48° where banks become prone to shallow-planar slide failures as they steepen. Where bank sections are inherently unstable and prone to shallow-planar slide failure, the additional weight of the trees may contribute to overall instability. However, manipulation of other stability parameters within reasonable constraints negates the effect of surcharge so it is not possible to demonstrate conclusively a destabilizing influence of silver wattles. Copyright © 2000 John Wiley & Sons, Ltd.","PeriodicalId":306887,"journal":{"name":"Regulated Rivers-research & Management","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116487241","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of water level regulation on algal biofilms in the River Murray, South Australia","authors":"A. Burns, K. Walker","doi":"10.1002/1099-1646(200009/10)16:5<433::AID-RRR595>3.0.CO;2-V","DOIUrl":"https://doi.org/10.1002/1099-1646(200009/10)16:5<433::AID-RRR595>3.0.CO;2-V","url":null,"abstract":"The composition and growth of algal biofilms were monitored over 90 days at two littoral sites on the River Murray at Lock 1 (Blanchetown). Sites included the pool impounded by a 3 m weir, where water levels are relatively stable, and the tailwater, where levels fluctuate daily. Depth profiles of organic biomass above the sediment and biofilm composition were similar between sites. Algal biomass peaked in the zones of maximum light and sustained inundation. Biofilm composition was affected more by temporal environmental changes common to both sites than by differences between sites. Filamentous Cyanobacteria (Lyngbya) were prevalent early in succession, but by day 90 were replaced by filamentous Chlorophyta (Spirogyra). If river levels are managed to maintain diverse successional stages as resources for grazing invertebrates, the magnitude and duration of inundation in the littoral zone should exceed the desiccation tolerances of biofilm organisms. Copyright © 2000 John Wiley & Sons, Ltd.","PeriodicalId":306887,"journal":{"name":"Regulated Rivers-research & Management","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130208178","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hydrological persistence and the ecology of dryland rivers","authors":"J. Puckridge, K. Walker, J. Costelloe","doi":"10.1002/1099-1646(200009/10)16:5<385::AID-RRR592>3.0.CO;2-W","DOIUrl":"https://doi.org/10.1002/1099-1646(200009/10)16:5<385::AID-RRR592>3.0.CO;2-W","url":null,"abstract":"The flow regime of Cooper Creek, central Australia, is subject to a summer-monsoonal climate and aseasonal cycles associated with the El Nino–Southern Oscillation (ENSO). Analysis of a 48-year hydrograph indicates that floods tend to occur in clusters associated with La Nina episodes. The influence of ENSO is apparent in lagged correlations between discharge and values of the Southern Oscillation Index (SOI), and in measures of coherency derived from cross-spectrum analysis. Hydrological persistence is indicated by partial auto-correlations between floods in successive years. In a cluster of five floods over 1987–1991, cumulative effects were apparent in wetland habitat areas, in water temperature and transparency, and in the recruitment patterns of five fish species: Nematalosa erebi (Clupeidae), Hypseleotris klunzingeri (Gobiidae), Melanotaenia splendida tatei (Melanotaeniidae), Retropinna semoni (Retropinnidae) and Gambusia holbrooki (Poeciliidae). During serial floods, native fish appear to have a recruitment advantage over the exotic Gambusia. Hydrological persistence and its ecological correlates warrant consideration in research, planning and management, particularly in regard to the water resources of arid and semi-arid regions. Copyright © 2000 John Wiley & Sons, Ltd.","PeriodicalId":306887,"journal":{"name":"Regulated Rivers-research & Management","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115317981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Using disaster to prevent catastrophe: referencing the impacts of flow changes in large dryland rivers","authors":"F. Sheldon, M. Thoms, O. Berry, J. Puckridge","doi":"10.1002/1099-1646(200009/10)16:5<403::AID-RRR593>3.0.CO;2-3","DOIUrl":"https://doi.org/10.1002/1099-1646(200009/10)16:5<403::AID-RRR593>3.0.CO;2-3","url":null,"abstract":"This paper outlines the hydrological change associated with water resources development for six rivers within the Murray-Darling Basin. Hydrological change was assessed using simulated data from the Integrated Quantity and Quality Model (IQQM) and a range of relatively simple flow statistics: the annual proportional flow deviation; the frequencies of medium or high flow events; and the durations of low or no-flow events. The changes in physical properties, water quality and biological characteristics within the six river systems were assessed from the literature and summarized. This information was used to construct a series of hypothetical curves (reference curves) summarizing ecological response to hydrological change. The suitability of these response curves was then checked using data from a seventh river, Cooper Creek, a relatively major pristine endorheic system in central Australia. Reference curves appear to be an effective tool for assessing the likely ecological responses of river systems to increased hydrological change. Copyright © 2000 John Wiley & Sons, Ltd.","PeriodicalId":306887,"journal":{"name":"Regulated Rivers-research & Management","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129815980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Detecting effects of environmental water allocations in wetlands of the Murray–Darling Basin, Australia","authors":"M. Reid, J. Brooks","doi":"10.1002/1099-1646(200009/10)16:5<479::AID-RRR599>3.0.CO;2-Y","DOIUrl":"https://doi.org/10.1002/1099-1646(200009/10)16:5<479::AID-RRR599>3.0.CO;2-Y","url":null,"abstract":"River regulation has significantly altered the hydrology and ecology of floodplain wetlands throughout the Murray‐Darling Basin, Australia. Management plans proposed for rivers in the Murray‐Darling Basin incorporate ‘environmental water allocations’ (EWAs) designed to redress some of the damage caused by regulation, via partial restoration of the natural hydrological regime that used to be experienced by associated floodplain wetlands. Monitoring and scientifically rigorous adaptive management practices are the key to the long-term success of EWAs, and successful monitoring relies on the well-informed selection of a variety of hydrologically sensitive indicators. In this paper, we recommend a range of physical, chemical and biological indicators for use for monitoring change in wetland health in response to EWAs. Physical and chemical variables suggested include wetland depth, wetland area and salinity. Aquatic macrophytes and macroinvertebrates are recommended as the primary biological indicators for monitoring change within the Murray‐Darling Basin, although the indicator potential of macroinvertebrates still has to be confirmed by planned and ongoing research. Information is also presented for a variety of other components of wetland ecosystems, including biofilms, zooplankton, birds, fish, mammals, reptiles, amphibians and fringing vegetation. Our current knowledge of the relationships of these variables with wetland hydrology and ecosystem health is relatively limited. Further research is required to investigate the nature of these relationships and determine the utility of these parameters as indicators within wetlands of the Murray‐Darling Basin. Copyright © 2000 John Wiley & Sons, Ltd.","PeriodicalId":306887,"journal":{"name":"Regulated Rivers-research & Management","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121557449","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Lowland rivers: an Australian introduction","authors":"M. Thoms, F. Sheldon","doi":"10.1002/1099-1646(200009/10)16:5<375::AID-RRR591>3.0.CO;2-#","DOIUrl":"https://doi.org/10.1002/1099-1646(200009/10)16:5<375::AID-RRR591>3.0.CO;2-#","url":null,"abstract":"An evident trend in river ecosystem research over the last 10 years has been the increased emphasis on larger systems and, in particular, on the importance of interconnections between river channels and their floodplains. The trend has been reflected in a rapidly expanding literature describing the character of large rivers. The 1989 special issue of Canadian Journal of Fisheries and Aquatic Sciences was one of the first publications to deal with these systems. These papers from the symposium on large rivers (Dodge, 1989) had a multidisciplined focus but only 11 of the 49 papers dealt with large floodplain rivers. The geomorphological character of lowland rivers was presented in Lowland Floodplain Ri6ers: Geomorphological Perspecti6es (Carling and Petts, 1992). There the aim was to describe the holistic nature of the river valley, shifting attention away from the river bed per se and considering, instead, the data that are required for a better understanding of channel–floodplain relationships over a range of time scales. More recently, selected papers from the International Conference, Sustaining the Ecological Integrity of Large Floodplain Ri6ers were presented in an issue of this journal. The common theme of the papers was the highly variable physical, chemical and biological natures of large river systems. Large rivers were portrayed as ‘moving targets’ or highly dynamic systems, with the general synthesis that research should focus on the trajectories of these systems rather than their status at points in time and space. Despite the lack of a detailed definition of lowland rivers there are a number of ecosystem models that conceptualize their structure and function. The River Continuum Concept (RCC; Vannote et al., 1980) was initially applied but later criticized (Sedell et al., 1989) because of its inability to evaluate biotic assemblages in large rivers and metabolic interactions in ecosystems and its emphasis on longitudinal linkages rather than lateral transfers between the channel and floodplain. The Flood Pulse Concept (FPC; Junk et al., 1989) addresses this problem and concerns itself with the ecological significance of temporal patterns of flow in lowland rivers. It recognizes the importance of floods in the dynamics of river–floodplain systems. However, this concept may be less applicable to confined lowland systems. The Riverine Productivity Model of Thorp and Delong (1994) concentrated on confined lowland systems and highlighted the significance of instream production and floodplain inputs of carbon in periods not just related to floods. Recently, Walker et al. (1995) have called for the development of a more generic model for dryland–lowland rivers. They suggest a more flexible approach that recognizes the importance of all energy transfers, and propose that a hybrid model could be formulated from the models and concepts already outlined. In a review of the ecology of Australian lotic systems, Lake (1994) notes that contemporary ","PeriodicalId":306887,"journal":{"name":"Regulated Rivers-research & Management","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114075318","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}