Pub Date : 2010-04-01DOI: 10.1080/03680770.2009.11902384
K. Schmieder, Annette Woithon, T. Heege, N. Pinnel
Submersed macrophytes are excellent bioindicators of the trophic state of a lake (SCHMIEDER 1997, LEHMANN & LACHAVANNE 1999). In large lakes, lake-wide investigations of submersed macrophytes are time consuming and expensive (ScHMIEDER & LEHMANN 2004). Consequently, there is often a low frequency of such investigations, generating a need for time saving methods o f for monitoring and assessment of lake shore vegetation. Against this background, the EFPLUS ( development of automatable remote sensing processes to effectively support planning schemes for lake shore areas) project was performed in 2002-2005 on the Lake Constance littoral zone. The first objective was to provide reliable and ecologically interpretable information on submersed and emersed macrophyte structures from automated and transferable remote sensing processes. The second objective was to aggregate this information into capable indices of water and habitat quality for decision support in planning procedures.
{"title":"Remote sensing techniques and GIS modeling for monitoring and assessing the littoral vegetation at Lake Constance","authors":"K. Schmieder, Annette Woithon, T. Heege, N. Pinnel","doi":"10.1080/03680770.2009.11902384","DOIUrl":"https://doi.org/10.1080/03680770.2009.11902384","url":null,"abstract":"Submersed macrophytes are excellent bioindicators of the trophic state of a lake (SCHMIEDER 1997, LEHMANN & LACHAVANNE 1999). In large lakes, lake-wide investigations of submersed macrophytes are time consuming and expensive (ScHMIEDER & LEHMANN 2004). Consequently, there is often a low frequency of such investigations, generating a need for time saving methods o f for monitoring and assessment of lake shore vegetation. Against this background, the EFPLUS ( development of automatable remote sensing processes to effectively support planning schemes for lake shore areas) project was performed in 2002-2005 on the Lake Constance littoral zone. The first objective was to provide reliable and ecologically interpretable information on submersed and emersed macrophyte structures from automated and transferable remote sensing processes. The second objective was to aggregate this information into capable indices of water and habitat quality for decision support in planning procedures.","PeriodicalId":404196,"journal":{"name":"Internationale Vereinigung für theoretische und angewandte Limnologie: Verhandlungen","volume":"98 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123474330","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}
Pub Date : 2010-04-01DOI: 10.1080/03680770.2009.11902400
G. Medeiros, T.K., K. Schmieder
{"title":"Volume 30 lectures arranged alphabetically by author","authors":"G. Medeiros, T.K., K. Schmieder","doi":"10.1080/03680770.2009.11902400","DOIUrl":"https://doi.org/10.1080/03680770.2009.11902400","url":null,"abstract":"","PeriodicalId":404196,"journal":{"name":"Internationale Vereinigung für theoretische und angewandte Limnologie: Verhandlungen","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128583506","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}
Pub Date : 2010-04-01DOI: 10.1080/03680770.2009.11902388
R. Knoechel, D. Copeman, C. E. Campbell
(2010). Long-term trophic evolution of a northern reservoir following impoundment: different temporal response patterns of primary production and plankton biomass with a predictive model for future trends. SIL Proceedings, 1922-2010: Vol. 30, No. 10, pp. 1619-1624.
(2010)。北部水库蓄水后的长期营养演化:初级生产和浮游生物生物量的不同时间响应模式及其未来趋势的预测模型SIL学报，1922-2010:Vol. 30, No. 10, pp. 1619-1624。
{"title":"Long-term trophic evolution of a northern reservoir following impoundment: different temporal response patterns of primary production and plankton biomass with a predictive model for future trends","authors":"R. Knoechel, D. Copeman, C. E. Campbell","doi":"10.1080/03680770.2009.11902388","DOIUrl":"https://doi.org/10.1080/03680770.2009.11902388","url":null,"abstract":"(2010). Long-term trophic evolution of a northern reservoir following impoundment: different temporal response patterns of primary production and plankton biomass with a predictive model for future trends. SIL Proceedings, 1922-2010: Vol. 30, No. 10, pp. 1619-1624.","PeriodicalId":404196,"journal":{"name":"Internationale Vereinigung für theoretische und angewandte Limnologie: Verhandlungen","volume":"101 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124629212","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}
Pub Date : 2010-04-01DOI: 10.1080/03680770.2009.11902396
L. Koncsos, Z. Kozma
Our analysis was part of a comprehensive research study that focused on algae dynamics and aimed to estimate the distribution of net growth rate ( details in IsTV ÁNOVICS & HoNTI 2008.). The project was based on the high frequency, on-line measurement of longitudinal phytoplankton pattems carried out on Tisza River. Water parcels measured multiple times provided information about the variation of the algae biomasses associated to them. Growth rates were estimated by using travel times elapsed between the measurements (HoNTI et al. 2008), which required knowing the river's unsteady velocity field. Thus the purpose of this study was to provide hydraulic input, namely velocity data, for the analysis o f field observations. Considering the long and narrow spatial extents of the observed region, the 1D approach was sufficient. The Saint Venant equations were solved numerically to provide velocity pattems and to derive travel times. Results were evaluated on the basis of sediment modeling.
{"title":"Use of a 1D hydrodynamic model for assessing phytoplankton dynamics in Tisza River (Hungary)","authors":"L. Koncsos, Z. Kozma","doi":"10.1080/03680770.2009.11902396","DOIUrl":"https://doi.org/10.1080/03680770.2009.11902396","url":null,"abstract":"Our analysis was part of a comprehensive research study that focused on algae dynamics and aimed to estimate the distribution of net growth rate ( details in IsTV ÁNOVICS & HoNTI 2008.). The project was based on the high frequency, on-line measurement of longitudinal phytoplankton pattems carried out on Tisza River. Water parcels measured multiple times provided information about the variation of the algae biomasses associated to them. Growth rates were estimated by using travel times elapsed between the measurements (HoNTI et al. 2008), which required knowing the river's unsteady velocity field. Thus the purpose of this study was to provide hydraulic input, namely velocity data, for the analysis o f field observations. Considering the long and narrow spatial extents of the observed region, the 1D approach was sufficient. The Saint Venant equations were solved numerically to provide velocity pattems and to derive travel times. Results were evaluated on the basis of sediment modeling.","PeriodicalId":404196,"journal":{"name":"Internationale Vereinigung für theoretische und angewandte Limnologie: Verhandlungen","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117106692","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}
Pub Date : 2010-04-01DOI: 10.1080/03680770.2009.11902362
E. N. Brumbaugh, D. Culver
In many areas of the United States, striped bass (Morone saxatilis) area prized sport and food fish. Due to difficulties establishing spawning broodstock in reservoirs and lakes, many states have started stocking fingerlings produced via artificial spawning and raised in hatchery ponds. With dwindling availability of striped bass females, the production of hybrid striped bass based on white bass females ( often called sunshine bass or reciprocal cross hybrid striped bass, Morone chrysops ~ x M. saxatilis d') has increased greatly. However, variable survival and growth of juvenile sunshine bass (white bass Morone chrysops ~ x striped bass M saxatilis d' [Percichthyidae]) are problems for hatchery managers. This variability has been attributed to pond temperature fluctuations, fry stocking stress mortality, inadequate pond water quality, food availability, and even predation on fry by cyclopoid copepods. GEIGER et al. (1985) examined the diets o f striped bass larvae and found that fish 8-9 mm long consumed mainly adult copepods ( 69% ), with copepod nauplii and daphnid cladocerans comprising the remainder of the stomach contents. Striped bass (Morone saxatilis) larvae are typically stocked in to rearing ponds at 8-1 O mm in length whereas sunshine bass fry are usually stocked at 2-6 mm, so the early diet of sunshine bass fry should be limited to smaller organisms such as rotifers (Lunwm et al. 1998). LUDWIG (1994), DENSON & SMITH (1997), and LUDWIG & LoCHMANN (2000) report that their laboratory experiments feeding sunshine bass fry rotifers (e.g., Brachionus) and Artemia plus prepared feed yielded fry survival rates ranging from 21.2 to 67.2 %. However, few studies have examined the early diets of fish fry in natural waters or pond rearing systems, so little is known abou t diets o f hybrid striped bass fry or juveniles. In this study, we compared the diets of sunshine bass fry with pond zooplankton composition to determine whether food availability in the rearing ponds at 2 hatcheries affects fish diets, growth, and survival.
在美国的许多地区，条纹鲈鱼(Morone saxatilis)是珍贵的运动和食用鱼。由于在水库和湖泊中建立产卵种鱼很困难，许多州已经开始放养通过人工产卵生产的鱼种，并在孵化池中饲养。随着条纹鲈雌鱼数量的减少，以白鲈雌鱼为基础的杂交条纹鲈(通常称为阳光鲈或互交杂交条纹鲈，Morone chrysops ~ x M. saxatilis d’)的产量大大增加。然而，阳光鲈鱼(白鲈Morone chrysops ~ x条纹鲈M saxatilis d'[鲈科])幼鱼的生存和生长变化是孵化场管理人员面临的问题。这种变化可归因于池塘温度波动、鱼苗放养压力死亡、池塘水质不足、食物供应，甚至是圆弧桡足类对鱼苗的捕食。GEIGER等人(1985)研究了条纹鲈鱼幼虫的饮食，发现8-9毫米长的鱼主要食用成年桡足类(69%)，其余胃内容物为桡足类和水蚤类。条纹鲈鱼(Morone saxatilis)的幼虫通常在8- 10毫米长的养殖池中放养，而阳光鲈鱼鱼苗通常在2-6毫米长，因此阳光鲈鱼鱼苗的早期饮食应限于较小的生物，如轮虫(Lunwm et al. 1998)。LUDWIG(1994)、DENSON & SMITH(1997)和LUDWIG & LoCHMANN(2000)报告说，他们在实验室进行的实验中，用阳光鲈鱼鱼苗喂轮虫(如臂尾虫)和Artemia加上配制饲料，鱼苗存活率在21.2%至67.2%之间。然而，很少有研究调查了自然水域或池塘养殖系统中鱼苗的早期饮食，因此对杂交条纹鲈鱼鱼苗或幼鱼的饮食知之甚少。在本研究中，我们比较了阳光鲈鱼鱼苗的饮食和池塘浮游动物的组成，以确定2个孵化场饲养池的食物供应是否影响鱼的饮食、生长和生存。
{"title":"Diets of juvenile hybrid striped bass (Percichthyidae: Morone chrysops ♀ x M. saxatilis ♂)","authors":"E. N. Brumbaugh, D. Culver","doi":"10.1080/03680770.2009.11902362","DOIUrl":"https://doi.org/10.1080/03680770.2009.11902362","url":null,"abstract":"In many areas of the United States, striped bass (Morone saxatilis) area prized sport and food fish. Due to difficulties establishing spawning broodstock in reservoirs and lakes, many states have started stocking fingerlings produced via artificial spawning and raised in hatchery ponds. With dwindling availability of striped bass females, the production of hybrid striped bass based on white bass females ( often called sunshine bass or reciprocal cross hybrid striped bass, Morone chrysops ~ x M. saxatilis d') has increased greatly. However, variable survival and growth of juvenile sunshine bass (white bass Morone chrysops ~ x striped bass M saxatilis d' [Percichthyidae]) are problems for hatchery managers. This variability has been attributed to pond temperature fluctuations, fry stocking stress mortality, inadequate pond water quality, food availability, and even predation on fry by cyclopoid copepods. GEIGER et al. (1985) examined the diets o f striped bass larvae and found that fish 8-9 mm long consumed mainly adult copepods ( 69% ), with copepod nauplii and daphnid cladocerans comprising the remainder of the stomach contents. Striped bass (Morone saxatilis) larvae are typically stocked in to rearing ponds at 8-1 O mm in length whereas sunshine bass fry are usually stocked at 2-6 mm, so the early diet of sunshine bass fry should be limited to smaller organisms such as rotifers (Lunwm et al. 1998). LUDWIG (1994), DENSON & SMITH (1997), and LUDWIG & LoCHMANN (2000) report that their laboratory experiments feeding sunshine bass fry rotifers (e.g., Brachionus) and Artemia plus prepared feed yielded fry survival rates ranging from 21.2 to 67.2 %. However, few studies have examined the early diets of fish fry in natural waters or pond rearing systems, so little is known abou t diets o f hybrid striped bass fry or juveniles. In this study, we compared the diets of sunshine bass fry with pond zooplankton composition to determine whether food availability in the rearing ponds at 2 hatcheries affects fish diets, growth, and survival.","PeriodicalId":404196,"journal":{"name":"Internationale Vereinigung für theoretische und angewandte Limnologie: Verhandlungen","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131147595","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}
Pub Date : 2010-04-01DOI: 10.1080/03680770.2009.11902369
N. Sweeney, S. Linnane
The National Source Protection Pilot Project based at Milltown Lake, Co. Monaghan, is the first catchment-based source protection project established for the protection of drinking water sources in Ireland. Churchill and Oram Group Water Scheme extract their water supply from Milltown Lake, and preliminary results indicate that the lake is of eutrophic status, as categorised by the Organisation for Economic Co-operation and Development (OECD 1982) classification system. Phase one o f the project involves a detailed baseline water quality survey o f Milltown Lake 's catchment, in which this sub-project forms an essential role. Different biotic groups respond to different environmental factors (PAAVOLA et al. 2003); therefore, epilithic diatoms, in conjunction with macroinvertebrates and macrophytes in other sub-projects, are being studied to furnish the project with an assessment based on a number of taxonomic groups. This will establish the current status ofthe catchment and describe the composition of the diatom communities for future comparisons.
{"title":"Epilithic diatom communities of Milltown Lake's catchment, Co. Monaghan, Ireland","authors":"N. Sweeney, S. Linnane","doi":"10.1080/03680770.2009.11902369","DOIUrl":"https://doi.org/10.1080/03680770.2009.11902369","url":null,"abstract":"The National Source Protection Pilot Project based at Milltown Lake, Co. Monaghan, is the first catchment-based source protection project established for the protection of drinking water sources in Ireland. Churchill and Oram Group Water Scheme extract their water supply from Milltown Lake, and preliminary results indicate that the lake is of eutrophic status, as categorised by the Organisation for Economic Co-operation and Development (OECD 1982) classification system. Phase one o f the project involves a detailed baseline water quality survey o f Milltown Lake 's catchment, in which this sub-project forms an essential role. Different biotic groups respond to different environmental factors (PAAVOLA et al. 2003); therefore, epilithic diatoms, in conjunction with macroinvertebrates and macrophytes in other sub-projects, are being studied to furnish the project with an assessment based on a number of taxonomic groups. This will establish the current status ofthe catchment and describe the composition of the diatom communities for future comparisons.","PeriodicalId":404196,"journal":{"name":"Internationale Vereinigung für theoretische und angewandte Limnologie: Verhandlungen","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129877470","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}
Pub Date : 2010-04-01DOI: 10.1080/03680770.2009.11902395
M. Tarvainen, Anne-Mari Ventelä, H. Helminen, J. Sarvala
Removal fishing can be an effective method for restoration of eutrophied lakes (J EPPESEN & SAMMALKORPI 2002, COOKE et al. 2005). Costs may become very high in large lakes, however, which makes it difficult to maintain efficient fishing effort to achieve permanent results. In large, mesotrophic Lake Pyhãjãrvi in southwest Finland (Table l), a profitable commercial fishery targeting planktivorous vendace ( Coregonus albula) has for decades acted as unplanned biomanipulation, and the existing fishery infrastructure has made it possible to develop large-scale intentional and intensive fish removal operations (VENTELÃ et al. 2007). As a specialized zooplankton feeder, vendace i s akeystone species in the pelagic system, controlling zooplankton an d indirectlyphytoplankton (HELMINEN & SARVALA 1997). In the 1980s and early 1990s there was a positive correlation in Pyhãjãrvi between vendace year-class strength and the Iate summer values of chlorophyll a concentration, while zooplankton biomass was negatively correlated with both vendace year-class and chlorophyll a concentration, indicating an intermediary role of zooplankton between vendace and phytoplankton (HELMINEN & SARVALA 1997). Fishing of vendace has been very efficient; nearly 90 % o f the youngest age group is fished out yearly (SARVALA et al. 1998). Fishing methods include mainly winter seines (usually 8 seining groups in the 1980s, but mostly 4 since 1995) and f)rke nets in spring and autumn. In the 1990s, water quality in Lake Pyhãjãrvi deteriorated in spite of continued commercial fishing and weak vendace stock: phosphorus concentrations and phytoplankton biomass increased, and cyanobacterial blooms became more frequent, harming the recreational uses of the lake and even causing taste problems in the fish (VENTELÃ et al. 2007). The vendace population collapsed because of failed recruitment in 2 successive years due to unfavourable weather conditions and excessive predation pressure and remained small due to temporary overfishing (SARVALA & HELMINEN 2002). As a result of competitive release, the other fish species became more abundant and caused adverse water quality effects (SARVALA et al. 1998). The eutrophication of Pyhãjãrvi is connected to high extemal nutrient load from the catchment. The lake received industria! and community waste waters Table l. Description ofLake Pyhãjãrvi. Nutrient and chlorophyll a values represent averages ± SD during the open water periods (May-Oct) during 2000-2005.
去除捕捞是恢复富营养化湖泊的有效方法(J EPPESEN & SAMMALKORPI 2002, COOKE et al. 2005)。然而，在大的湖泊中，成本可能变得非常高，这使得很难保持有效的捕鱼努力以获得永久的结果。在芬兰西南部的大型中营养湖泊pyh j rvi(表1)，以浮游生物为目标的有利可图的商业渔业(Coregonus albula)几十年来一直是无计划的生物操纵，现有的渔业基础设施使开发大规模有意和密集的鱼类清除作业成为可能(VENTELÃ et al. 2007)。作为一种专门的浮游动物喂食者，vendace是远洋系统的基石物种，控制浮游动物并间接控制浮游植物(HELMINEN & SARVALA 1997)。在20世纪80年代和90年代初，在pyh jrvi中，复仇年级强度与夏末叶绿素a浓度呈正相关，而浮游动物生物量与复仇年级和叶绿素a浓度均呈负相关，表明浮游动物在复仇和浮游植物之间起着中介作用(HELMINEN & SARVALA 1997)。捕鱼的报复是非常有效的;每年有近90%的最年轻年龄组被捕捞(SARVALA et al. 1998)。捕鱼方法主要包括冬季围网(1980年代通常有8组围网，但1995年以来大多为4组)和春季和秋季的鱼网。20世纪90年代，尽管持续的商业捕捞和较弱的报复资源，pyh j rvi湖的水质恶化:磷浓度和浮游植物生物量增加，蓝藻繁殖变得更加频繁，损害了湖泊的娱乐用途，甚至引起了鱼类的味觉问题(VENTELÃ et al. 2007)。由于不利的天气条件和过度的捕食压力，连续2年的招募失败导致了vendace种群的崩溃，并且由于暂时的过度捕捞而保持较小的数量(SARVALA & HELMINEN 2002)。由于竞争性放生，其他鱼类种类变得更加丰富，并造成不利的水质影响(SARVALA et al. 1998)。pyh jj rvi的富营养化与来自集水区的高外部营养负荷有关。这个湖收到了工业!和社区废水。表1 . pyh jj rvi的描述。养分和叶绿素a值代表2000-2005年开放水域(5 - 10月)的平均值±标准差。
{"title":"Selective removal fishing — water quality and practical viewpoints","authors":"M. Tarvainen, Anne-Mari Ventelä, H. Helminen, J. Sarvala","doi":"10.1080/03680770.2009.11902395","DOIUrl":"https://doi.org/10.1080/03680770.2009.11902395","url":null,"abstract":"Removal fishing can be an effective method for restoration of eutrophied lakes (J EPPESEN & SAMMALKORPI 2002, COOKE et al. 2005). Costs may become very high in large lakes, however, which makes it difficult to maintain efficient fishing effort to achieve permanent results. In large, mesotrophic Lake Pyhãjãrvi in southwest Finland (Table l), a profitable commercial fishery targeting planktivorous vendace ( Coregonus albula) has for decades acted as unplanned biomanipulation, and the existing fishery infrastructure has made it possible to develop large-scale intentional and intensive fish removal operations (VENTELÃ et al. 2007). As a specialized zooplankton feeder, vendace i s akeystone species in the pelagic system, controlling zooplankton an d indirectlyphytoplankton (HELMINEN & SARVALA 1997). In the 1980s and early 1990s there was a positive correlation in Pyhãjãrvi between vendace year-class strength and the Iate summer values of chlorophyll a concentration, while zooplankton biomass was negatively correlated with both vendace year-class and chlorophyll a concentration, indicating an intermediary role of zooplankton between vendace and phytoplankton (HELMINEN & SARVALA 1997). Fishing of vendace has been very efficient; nearly 90 % o f the youngest age group is fished out yearly (SARVALA et al. 1998). Fishing methods include mainly winter seines (usually 8 seining groups in the 1980s, but mostly 4 since 1995) and f)rke nets in spring and autumn. In the 1990s, water quality in Lake Pyhãjãrvi deteriorated in spite of continued commercial fishing and weak vendace stock: phosphorus concentrations and phytoplankton biomass increased, and cyanobacterial blooms became more frequent, harming the recreational uses of the lake and even causing taste problems in the fish (VENTELÃ et al. 2007). The vendace population collapsed because of failed recruitment in 2 successive years due to unfavourable weather conditions and excessive predation pressure and remained small due to temporary overfishing (SARVALA & HELMINEN 2002). As a result of competitive release, the other fish species became more abundant and caused adverse water quality effects (SARVALA et al. 1998). The eutrophication of Pyhãjãrvi is connected to high extemal nutrient load from the catchment. The lake received industria! and community waste waters Table l. Description ofLake Pyhãjãrvi. Nutrient and chlorophyll a values represent averages ± SD during the open water periods (May-Oct) during 2000-2005.","PeriodicalId":404196,"journal":{"name":"Internationale Vereinigung für theoretische und angewandte Limnologie: Verhandlungen","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130747694","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}
Pub Date : 2010-04-01DOI: 10.1080/03680770.2009.11902389
M. Rubim, M. A. Villacorta-Correa
(2010). Limnological characterization of the lakes of black- and white-waters in the central Amazonian, Brazil. SIL Proceedings, 1922-2010: Vol. 30, No. 10, pp. 1625-1628.
(2010)。巴西亚马逊河中部黑水和白水湖泊的湖沼学特征。SIL学报，1922-2010:Vol. 30, No. 10, pp. 1625-1628。
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Pub Date : 2010-04-01DOI: 10.1080/03680770.2009.11902367
H. Ii, J. Sherwood, N. Turoczy
Southwest Victoria, Australia, has many lakes and rivers, most of which cannot be used for agricultural or domestic purposes because of their high salt content. The Glenelg River, located 300 km west ofMelboume, is the largest river in southwest Victoria and an important ecological and agricultural water resource. Although local precipitation i s more than 600 mm per year, the Glenelg River's salt content exceeds l/l O that of sea water with electrical conductivity (EC) values of several thousand J.LS/cm. In these reaches it cannot be used as drinking or irrigation water. Historically, river salinization has been attributed to (l) evaporation and concentration during reservoir storage, irrigation, and subsequent reuse; (2) displacement o f shallow saline groundwater during irrigation; (3) erosion and dissolution of natural deposits; andlor (4) inflow of deep saline and/or geothermal groundwater (MooRE et al. 2008). Hydrogen and oxygen stable isotopes and chloride concentration have proved useful for determining salt sources (DRUHAN et al. 2008). The purpose of our study was to determine the origin o f the sai t and how it concentrates in the Glenelg River using oxygen and hydrogen stable isotopes and chloride content.
澳大利亚维多利亚州西南部有许多湖泊和河流，其中大多数由于含盐量高而不能用于农业或家庭用途。格伦尔格河位于墨尔本以西300公里处，是维多利亚州西南部最大的河流，也是重要的生态和农业水资源。虽然当地年降水量超过600毫米，但Glenelg河的含盐量超过了海水的l/l / O，电导率(EC)达到几千J.LS/cm。在这些河流中，它不能被用作饮用水或灌溉用水。历史上，河流盐碱化归因于(1)水库蓄水、灌溉和随后的再利用过程中的蒸发和浓缩;(2)灌溉过程中浅层含盐地下水的排水量;(3)自然沉积物的侵蚀和溶蚀;(4)深层盐水和/或地热地下水流入(MooRE et al. 2008)。氢和氧稳定同位素和氯化物浓度已被证明可用于确定盐源(DRUHAN等人，2008年)。我们研究的目的是利用氧和氢的稳定同位素和氯化物含量来确定这种水的来源，以及它是如何在格伦尔格河中富集的。
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Pub Date : 2010-04-01DOI: 10.1080/03680770.2009.11902390
John R. Jones
Missouri reservoirs are located in a mid-contment ecotonal zone at the intersection of historic prairies and broad-leafed forests. Reservoir nutrients span the trophic state range and increase along a south-to-north axis across several distinct physiographic regions (JoNES et al. 2008a). Empirical analyses show this pattem is largely accounted for by cropland cover in the catchments (a surrogate for nutrient los s from agriculture) as modified by morphology and hydrology (JoNES et al. 2004, 2008b, 2009). These findings are consistent with limnological theory about the role ofhydrology and morphology moditying extemal nutrient loads to lakes. Most Missouri reservoirs were constructed within the past 50 years, but many are half that age. With few exceptions, land cover at the time of impoundment closely matched current conditions (JoNES et al. 2004, 2009). As such, nutrient loads were in place prior to creating these artificiallakes on the landscape. Reservoir age does not influence cross-system pattems for nutrients, suggesting that trophic state is largely
密苏里水库位于历史悠久的草原和阔叶林交汇处的中部休养带。水库营养物质跨越营养状态范围，并沿南北轴线跨越几个不同的地理区域增加(JoNES等，2008a)。实证分析表明，这种模式在很大程度上是由形态和水文改变的流域耕地覆盖(农业养分流失的替代指标)造成的(JoNES et al. 2004,2008b, 2009)。这些发现与湖泊学理论关于水文和形态改变湖泊外部营养负荷的作用是一致的。密苏里州的大多数水库都是在过去50年内建成的，但许多水库的年龄只有50年的一半。除了少数例外，蓄水时的土地覆盖与当前条件非常吻合(JoNES et al. 2004,2009)。因此，在景观上创造这些人工湖之前，营养负荷已经到位。水库年龄不影响营养物质的跨系统模式，这表明营养状态在很大程度上是不同的
{"title":"Missouri reservoirs in the Glacial Plains: evaluating small impoundments","authors":"John R. Jones","doi":"10.1080/03680770.2009.11902390","DOIUrl":"https://doi.org/10.1080/03680770.2009.11902390","url":null,"abstract":"Missouri reservoirs are located in a mid-contment ecotonal zone at the intersection of historic prairies and broad-leafed forests. Reservoir nutrients span the trophic state range and increase along a south-to-north axis across several distinct physiographic regions (JoNES et al. 2008a). Empirical analyses show this pattem is largely accounted for by cropland cover in the catchments (a surrogate for nutrient los s from agriculture) as modified by morphology and hydrology (JoNES et al. 2004, 2008b, 2009). These findings are consistent with limnological theory about the role ofhydrology and morphology moditying extemal nutrient loads to lakes. Most Missouri reservoirs were constructed within the past 50 years, but many are half that age. With few exceptions, land cover at the time of impoundment closely matched current conditions (JoNES et al. 2004, 2009). As such, nutrient loads were in place prior to creating these artificiallakes on the landscape. Reservoir age does not influence cross-system pattems for nutrients, suggesting that trophic state is largely","PeriodicalId":404196,"journal":{"name":"Internationale Vereinigung für theoretische und angewandte Limnologie: Verhandlungen","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125503870","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}
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