Regulated Rivers-research & Management最新文献

Effects of habitat enhancement on 0‐group fishes in a lowland river 生境增强对低地河流0群鱼类的影响

Regulated Rivers-research & Management Pub Date : 2001-11-01 DOI: 10.1002/RRR.627

Glenn J. Langler, Carl Smith

{"title":"Effects of habitat enhancement on 0‐group fishes in a lowland river","authors":"Glenn J. Langler, Carl Smith","doi":"10.1002/RRR.627","DOIUrl":"https://doi.org/10.1002/RRR.627","url":null,"abstract":"Loss of habitat complexity through river channelization can have adverse affects on riverine fauna and flora through reductions in abundance and diversity of species. Habitat enhancement schemes are used to improve the physical and biological heterogeneity of riverine habitats. Between 1996 and 1997 the Environment Agency undertook a habitat enhancement scheme on the Huntspill River, Somerset, England to improve conditions for coarse (non-salmonid) fishes. The scheme involved reducing bank gradients and the construction of off-channel bays in parts of the channel, all of which were planted with willow (Salix sp.) and common reed (Phragmites australis). The effectiveness of the enhancement scheme was investigated by comparing 0-group fish assemblages in manipulated and unmanipulated sites. Abundance and diversity of 0-group fishes was significantly higher in manipulated habitats. There was no significant difference detected in the effects of the different types of enhancement measure used. The significance of microhabitats produced by habitat enhancement schemes is discussed with respect to spawning, nursery and refuge sites for 0-group coarse fish assemblages. Copyright © 2001 John Wiley & Sons, Ltd.","PeriodicalId":306887,"journal":{"name":"Regulated Rivers-research & Management","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127107388","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}

引用次数: 51

Hydrochemistry of the hyporheic zone in salmon spawning gravels: a preliminary assessment in a degraded agricultural stream 鲑鱼产卵砂砾中下潜带的水化学:退化农业溪流的初步评估

Regulated Rivers-research & Management Pub Date : 2001-11-01 DOI: 10.1002/RRR.625

C. Soulsby, I. Malcolm, A. Youngson

{"title":"Hydrochemistry of the hyporheic zone in salmon spawning gravels: a preliminary assessment in a degraded agricultural stream","authors":"C. Soulsby, I. Malcolm, A. Youngson","doi":"10.1002/RRR.625","DOIUrl":"https://doi.org/10.1002/RRR.625","url":null,"abstract":"Hydrochemical changes were monitored in a simulated, sea run salmon redd in a small agricultural stream in northeast Scotland following the 1998–1999 spawning season. Immediately after redd construction, the hydrochemical characteristics of hyporheic water, at depths of 0.1 m and 0.3 m, were very similar to stream water. These apparently well-mixed waters were alkaline, well-oxygenated and enriched in nutrients. In the weeks and months following redd construction, clear and statistically significant differences in the chemistry of stream and hyporheic waters were observed. Typically, hyporheic water had lower concentrations of dissolved oxygen (mean 7.35 mg L−1 at 0.3 m depth) than stream waters (mean=11.26 mg L−1). Alkalinity, calcium, sulphate and conductivity levels tended to be higher in hyporheic waters, with concentrations increasing with depth. These data implied an increasing influence of groundwater with depth in the hyporheic zone following redd construction; an inference supported by subsequent hydraulic head measurements, which revealed an upwards groundwater flux in the stream bed. However, groundwater–surface water interactions were dynamic and complex: road salts eluted into the stream during periods of snowmelt simulated tracer experiments that implied that a reversed hydraulic gradient may occur at high flows with deeper streamwater penetration and mixing in the hyporheic zone. High flows also result in the mobilization of fine sediments from the stream bed which subsequently infiltrated into spawning gravels. These appear to cause ‘capping’ of redds and probably reduce the hydraulic conductivity of the redd matrix. Infiltrating sediments also contain a small, but probably important organic component, the decomposition of which may contribute to oxygen consumption and nutrient mineralization in the hyporheic zone. Copyright © 2001 John Wiley & Sons, Ltd.","PeriodicalId":306887,"journal":{"name":"Regulated Rivers-research & Management","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132002557","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}

引用次数: 82

Use of mesohabitat‐specific relationships between flow velocity and river discharge to assess invertebrate minimum flow requirements 利用水流速度和河流流量之间的中生境特定关系来评估无脊椎动物的最小流量需求

Regulated Rivers-research & Management Pub Date : 2001-11-01 DOI: 10.1002/RRR.626

M. Brunke, A. Hoffmann, M. Pusch

引用次数: 52

Consequences of stream impoundment on fish communities in a small north American drainage 河流蓄水对北美一个小流域鱼类群落的影响

Regulated Rivers-research & Management Pub Date : 2001-11-01 DOI: 10.1002/RRR.629

Christopher A. Taylor, J. Knouft, J. Knouft, Tim M. Hiland

{"title":"Consequences of stream impoundment on fish communities in a small north American drainage","authors":"Christopher A. Taylor, J. Knouft, J. Knouft, Tim M. Hiland","doi":"10.1002/RRR.629","DOIUrl":"https://doi.org/10.1002/RRR.629","url":null,"abstract":"We examined impoundment associated fish community changes in the Kinkaid Creek drainage of southern Illinois by comparing collections made in 1998 and 1999 with a pre-impoundment survey conducted in 1958. We also analyzed other historical pre- and post-impoundment collections made during the past 60+ years. A dramatic change in fish community structure occurred with the pre-impoundment community dominated by cyprinids and the post-impoundment community now dominated by centrarchids. In addition, a 50% increase in the number of fish species known from the Kinkaid Creek drainage has occurred, with 35% of all species known from Illinois now present in the drainage. This increase in species richness coincides with the extirpation of six native species. Possible explanations for the changes in the species assemblage and increased species richness include the introduction and dispersal of non-native fish species and habitat alteration. Finally, we contend that processes, such as habitat alteration, must be considered when analyzing the pattern of increased species richness caused by non-native species seen in North American drainages. Copyright © 2001 John Wiley & Sons, Ltd.","PeriodicalId":306887,"journal":{"name":"Regulated Rivers-research & Management","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134428648","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}

引用次数: 82

Flow management strategies to control blooms of the cyanobacterium, Anabaena circinalis, in the River Murray at Morgan, south Australia 流量管理策略，以控制蓝藻，环状水藻，在莫里河摩根，南澳大利亚

Regulated Rivers-research & Management Pub Date : 2001-11-01 DOI: 10.1002/RRR.623

H. Maier, M. Burch, M. Bormans

{"title":"Flow management strategies to control blooms of the cyanobacterium, Anabaena circinalis, in the River Murray at Morgan, south Australia","authors":"H. Maier, M. Burch, M. Bormans","doi":"10.1002/RRR.623","DOIUrl":"https://doi.org/10.1002/RRR.623","url":null,"abstract":"The Murray–Darling river system is highly regulated and is Australia's major surface water resource. It is subject to blooms of the toxic cyanobacterium Anabaena circinalis, which present significant water quality problems. As a result of these blooms, an algal management strategy has been developed for the Murray–Darling basin. One of the major objectives of the strategy is the development of flow management strategies for key reaches of the river system. Intensive studies in the Murrumbidgee River, Australia, have indicated that persistent thermal stratification is a requirement for blooms of this cyanobacterium to occur. In the lower Murray, mean wind speed was found to be the major factor affecting the degree of thermal stratification under low flow conditions, which generally exist during the months of December to March. In this paper, the effect of various flow management scenarios on the likelihood of the occurrence of blooms in the River Murray at Morgan, South Australia, are assessed. A frequency analysis is carried out on 30 years of wind speed data to determine the probability of occurrence of persistent thermal stratification under a number of flow regimes. The scenarios evaluated include existing base flow conditions, altered base flow regimes, temporary releases from an upstream storage (Lake Victoria) and the temporary reduction of weir pool levels. The results obtained indicate that the dispersal of existing blooms by simultaneously reducing the weir pool levels at Locks 1–3 is the most effective and economical strategy for combating bloom formation by A. circinalis in the River Murray at Morgan. Copyright © 2001 John Wiley & Sons, Ltd.","PeriodicalId":306887,"journal":{"name":"Regulated Rivers-research & Management","volume":"154 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116004558","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}

引用次数: 88

Patterns of species richness and introduced species in native freshwater fish faunas of a Mediterranean‐type basin: the Guadiana River (southwest Iberian Peninsula) 地中海型盆地:瓜迪亚纳河(伊比利亚半岛西南部)本地淡水鱼群落物种丰富度和引进物种格局

Regulated Rivers-research & Management Pub Date : 2001-11-01 DOI: 10.1002/RRR.631

C. Corbacho, J. M. Sánchez

{"title":"Patterns of species richness and introduced species in native freshwater fish faunas of a Mediterranean‐type basin: the Guadiana River (southwest Iberian Peninsula)","authors":"C. Corbacho, J. M. Sánchez","doi":"10.1002/RRR.631","DOIUrl":"https://doi.org/10.1002/RRR.631","url":null,"abstract":"In this study, we analysed the factors affecting species richness and introduced species component patterns in native fish faunas of 30 streams of the Middle Basin of the Guadiana River. From a principal component analysis and a stepwise multiple regression analysis performed on a data matrix composed of ten hydrological and biotic variables, we showed that: (1) fish species richness increased with stream length and watershed area, (2) the number of native species in a stream declined as channelizations and river regulation (constructions of dams) are higher, whereas introduced species increased in the same way, (3) the two main negative factors affecting native ichthyofaunas affected dissimilar ecological areas: channelizations, which depend on land-use intensity of floodplain, mainly occurred in lower reaches of streams, but construction of dams mainly took place in upper sections of rivers, (4) the length of the remaining well-preserved reaches in a stream appeared to be the only factor accurately predicting native fish species richness, and (5) native fish faunas of small isolated streams are more vulnerable to habitat alteration than those of large streams. Both isolation and fragmentation of populations were recorded, so the conservation status of native and highly endemic fish fauna of the study area is extreme. Protection of the few still extant, well-preserved small streams and upper reaches, habitat restoration of channeled areas, and inclusion of the need for native fish fauna conservation in long-term public planning of water use become a priority. Fish communities appear to be a sensitive indicator of biological monitoring to assess environmental degradation. Copyright © 2001 John Wiley & Sons, Ltd.","PeriodicalId":306887,"journal":{"name":"Regulated Rivers-research & Management","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121420676","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}

引用次数: 60

Contrasting temperatures, waterflows, and light: seasonal habitat selection by young Atlantic salmon and brown trout in a boreonemoral river 对比温度、水流和光线:大西洋鲑鱼和褐鳟鱼在北部河流中的季节性栖息地选择

Regulated Rivers-research & Management Pub Date : 2001-11-01 DOI: 10.1002/RRR.620

J. Heggenes, J. G. Dokk

{"title":"Contrasting temperatures, waterflows, and light: seasonal habitat selection by young Atlantic salmon and brown trout in a boreonemoral river","authors":"J. Heggenes, J. G. Dokk","doi":"10.1002/RRR.620","DOIUrl":"https://doi.org/10.1002/RRR.620","url":null,"abstract":"Habitat use and habitat selection by young Atlantic salmon and brown trout were investigated by direct underwater observation. We sampled during winter and summer water temperatures (low: 3–7°C; high: 9–12°C) coinciding with low and high waterflows (12–20 and 60–80 m3 s−1), and during day and night in winter, and on six selected stations in the river. Observations of 396 salmon and 120 trout indicated a distinct seasonal pattern in behaviours and habitat selection. Feeding was the dominant behaviour at high water temperatures during summer. In winter, there was a diurnal pattern in behaviour; both species sheltered in interstitial spaces in the substrate during daylight, but during night held positions on or close to the substrate in slower flowing stream areas. Coarse substrate providing cover was therefore an important habitat factor during daylight at low water temperatures, while slow-flowing water was important during night. Although spatial niche overlap was considerable both in summer and winter, salmon and trout segregated with respect to meso- and microhabitat selection, and relatively more at low temperatures. Both species changed their use of mesohabitats towards more slow-flowing glide/flat habitats in winter. Irrespective of season, trout preferred in general more slow-flowing water than salmon did, but the difference was more pronounced in winter. Salmon used a wider range of water depths and in particular water velocities, than did trout. Both species were less tolerant of high water velocities at low water temperatures. The seasonal and diurnal pattern in habitat selection reported have important implications for habitat research and habitat-hydraulic modelling. Copyright © 2001 John Wiley & Sons, Ltd.","PeriodicalId":306887,"journal":{"name":"Regulated Rivers-research & Management","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114896447","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}

引用次数: 83

Effects of hydrological regime on the drift algae in a regulated Mediterranean river (River Verdon, southeastern France) 水文条件对调节后地中海河流(法国东南部弗登河)漂藻的影响

Regulated Rivers-research & Management Pub Date : 2001-07-01 DOI: 10.1002/RRR.654

C. Bertrand, Véronique Siauve, S. Fayolle, A. Cazaubon

引用次数: 20

Seasonal changes of fish diversity in the main channel of the large lowland River Oder 奥得河主河道鱼类多样性的季节变化

Regulated Rivers-research & Management Pub Date : 2001-07-01 DOI: 10.1002/RRR.645

C. Wolter, A. Bischoff

{"title":"Seasonal changes of fish diversity in the main channel of the large lowland River Oder","authors":"C. Wolter, A. Bischoff","doi":"10.1002/RRR.645","DOIUrl":"https://doi.org/10.1002/RRR.645","url":null,"abstract":"Between June 1998 and May 2000 an adult fish sampling was carried out in the lowland River Oder using bottom otter trawls in the mid channel and electric fishing at the shorelines. This study focused on the lateral connectivity between mid channel and river margins with the aim to characterize the importance of mid-channel sections as fish habitat. Altogether 15 660 fish of 30 species were sampled, 8169 fish of 20 species in the mid-channel section and 7491 fish of 27 species at the shoreline. At the shoreline we observed significantly higher fish densities (345.4 ± 51.8 fish per 1000 m 3 compared to 5.2 ± 1.0, mean ± standard error) and numbers of species (11.1 ± 0.5, respectively, 5.2 ± 0.3), However, three species were exclusively in the mid channel and a further six more frequent there. The mid channel was dominated by silver bream (Abramis bjoerkna) representing 75.6% of the total catch. It was generally colonized by bigger fish (22.1 ±0.12 cm total length compared to 13.0±0.08 cm). According to the observed significant habitat preferences, we classified a guild of potamal species, which shift during their first year of life to mid-channel habitats and exhibited the highest relative abundance there. To this guild belong the following species: silver bream, common bream (Abramis brama), blue bream (Abramis ballerus), whitefin gudgeon (Gobio albipinnatus), zander (Sander lucioperca) and wels (Silurus glanis).","PeriodicalId":306887,"journal":{"name":"Regulated Rivers-research & Management","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114818914","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}

引用次数: 65

Revisiting the serial discontinuity concept 回顾连续不连续的概念

Regulated Rivers-research & Management Pub Date : 2001-07-01 DOI: 10.1002/RRR.659

J. Stanford, J. Ward

引用次数: 276