Internationale Vereinigung für theoretische und angewandte Limnologie: Verhandlungen最新文献

{"title":"Distribution of mercury in the sediments of Amistad International Reservoir, Texas, USA","authors":"Jesse C. Becker, A. Groeger","doi":"10.1080/03680770.2009.11902375","DOIUrl":"https://doi.org/10.1080/03680770.2009.11902375","url":null,"abstract":"Mercury (Hg) is a widely studied pollutant of great concern in aquatic ecosystems, yet we know little about its distribution in large reservoirs, especially those in subtropical and tropical regions. Determining the spatial distribution of Hg in aquatic ecosystems is important for understanding how it cycles through systems. Most of the Hg investigations involving a spatial component have been done on larger scales (e.g. GILMOUR et al. 1998, DAVIS et al. 2008) or in boreal and temperate regions (e.g. GoRSKI et al. 2003). Amistad International Reservoir is a large subtropical reservoir located on the border between Texas, United States, and eoahuila, Mexico (29°27'N; 101 °03'W), in the Rio Grande/Río Bravo drainage basin. At conservation level (340.5 m a.s.l.) it covers approximately 263 km• The reservoir is oligotrophic with high alkalinity and pH, low dissolved organic carbon (DOe; IBWe 1997, TeEQ 2004), and low wetland area (authors, pers. observ.). These characteristics are not usually linked to elevated Hg levels in biota. VANMETRE et al. (1997) found low but increasing levels of total Hg over time in the sediments o f the reservoir (40-50 ppb at the surface) using 2 sediment cores and linked much of this increase to atmospheric sources. The only native sources of Hg in the basin are approximately 250 km upstream in the Big Bend region. This area, known as the Terlingua Mining District, was the third largest Hg mining area in the United States until the mines were closed in 1973 (GRAY et al. 2006). We present a preliminary description of the variation in sediment total Hg and some potential influences on the movement o f this H g through the system. Results to date suggest higher loading to the Rio Grande (RG) arm of the reservoir, while the Devils River (DR) arm has conditions that may facilitate the transformation of inorganic Hg into organic methyl mercury (meHg). Analysis offish tissue indicates that meHg i s accumulating in the large sport fish o f the system.","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":"115178390","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":"Spatial distribution of Chironomus salinarius Kieffer (Diptera: Chironomidae) in brackish water in Mediterranean area: First results","authors":"V. Cartier, C. Claret, A. Cazaubon, E. Franquet","doi":"10.1080/03680770.2009.11902378","DOIUrl":"https://doi.org/10.1080/03680770.2009.11902378","url":null,"abstract":"Coastallagoons are defined as open masses ofbrackish water isolated (or semi-isolated) from the sea by sand har, but receiving sea waters. They are characterised by a large environmental variability on spatial and temporal scales. Larvae o f Chironomidae are often numero us in brackish waters such as coastal lagoons; sometimes the adults can create swarms. The larvae usually have a clustered behaviour (ScHMID 1993), and their spatial distribution has to be considered at different scales and according to environmental variables. The chironomid distribution is usually linked to habitat characteristics like substratum or food avalibility, both in lotic and lentic habitats (ScHMID 1993, FRANQUET 1999, LüBINSKE et al. 2002, Vos et al. 2002). For the organisms living in soft sediments with high organic matter content, the oxygen concentration sould be considered (INTPANIS et al. 1996). Our aim was to provide an accurate knowledge of the larval spatial distribution in a French coastallagoon, related to environmental parameters.","PeriodicalId":404196,"journal":{"name":"Internationale Vereinigung für theoretische und angewandte Limnologie: Verhandlungen","volume":"54 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":"133345081","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":"Analysis of organic nitrogen compound in domestic sewage in Yamato River using a social experimental test","authors":"M. Taniguchi, H. Ii, T. Hirata","doi":"10.1080/03680770.2009.11902381","DOIUrl":"https://doi.org/10.1080/03680770.2009.11902381","url":null,"abstract":"A social experimental test to reduce the amount of organic pollutant from households was performed along the Yamato River in Japan. The river is polluted with organic compounds in sewage and has the highest biological oxygen demand (BOD) of all rivers managed by Japanese government. Because of this, the government carried out a cleaning campaign to improve the water quality in the Yamato River between 1985 and 2005 by constructing river purification facilities and sewerage systems. We evaluated these efforts of the sewage systems and the river water cleaning campaign by measuring the change in the amount o f nitrogen compounds and by pollutant load analysis.","PeriodicalId":404196,"journal":{"name":"Internationale Vereinigung für theoretische und angewandte Limnologie: Verhandlungen","volume":"139 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":"133886505","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":"Characterization of UV-absorbing organic matter in Lake Biwa using high-performance liquid chromatography/mass spectrometry","authors":"Chizuru Wada, K. Hayakawa, Tomoyo Suzuki, T. Kumagai, Yuko Sugiyama","doi":"10.1080/03680770.2009.11902368","DOIUrl":"https://doi.org/10.1080/03680770.2009.11902368","url":null,"abstract":"Dissolved organic matter (DOM) is a major portion of organic matter in the aquatic environment and operationally defined as the organic materials that pass through a filter with pore size 0.1-0.7 f.!m. DOM has various important roles in the environment. lt is one of the important carbon reservoirs in the global carbon cycle (HEDGES 1992), a main energy source of aquatic heterotrophic bacteria (AZAM et al. 1983), and it controls the attenuation of ultraviolet radiation in water (WILLIAMSON & ZAGARESE 1994). Recently, the solar ultraviolet radiation reaching the earth's surface has increased due to anthropogenic diminishing of the ozone layer in the stratosphere (FARMAN et al. 1985). Solar ultraviolet radiation has harmful effects not only on terrestrial plants and animals but also on aquatic organisms (HoDOKI & WATANABE 1998). Recent studies have suggested that UV-B radiation (280-320 nm) alters the balance between the biological processes producing organic materials and chemical and microbial processes degrading them (ZEPP et al. 1998). Observations in aquatic ecosystems have shown that, in stratified waters, exposure of solar UV radiation promotes net decreases of chromophoric dissolved organic matter (CDOM) and results in increases o f UV-B penetration into the water colurnn (HADER et al. 1998). The distribution and characteristics of UV absorbing organic matter such as CDOM in aquatic environments must be known to understand its influence on the aquatic ecosystems; however, information about the chemical structure or origin of it is limited. In this study, our aim was to characterize UV-absorbing organic matter in Lake Biwa using high-performance liquid chromatography (HPLC) with reverse phase octadecy silica column and investigate the mass distribution ofthe separated organic molecules using electrospray ionization mass spectrometry (ESI-MS).","PeriodicalId":404196,"journal":{"name":"Internationale Vereinigung für theoretische und angewandte Limnologie: Verhandlungen","volume":"12 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":"124479927","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":"Seston flux in a tropical saline lake","authors":"L. Oseguera, J. Alcocer, E. Escobar","doi":"10.1080/03680770.2009.11902359","DOIUrl":"https://doi.org/10.1080/03680770.2009.11902359","url":null,"abstract":"The dynamies of seston fluxes has been assoeiated with phytoplankton blooms in marine and freshwater systems (VINERMozziNI et al. 2003). The fate of these blooms is erucial to the understanding of earbon flow, nutrient eycling and eeosystem funetions. As a eonsequenee, it is important to unravel the meehanisms of particle sedimentation as well as the quantity and quality of settling particles. Eeosystem proeesses are important determinants o f the biogeoehemistry o f the oeean that ean be profoundly affeeted by ehanges in elimate (LE QuÉRÉ et al. 2005). The different routes that the particles take in the aquatie eeosystem (transfer in food-web, respiration, sedimentation, and burial) will define the availability of earbon to organisms and the time of return of earbon moleeules in the earbon eycle. The transfer in the food web and its proeesses are important eontrols of aquatie biogenie earbon flux and water-atmosphere earbon dioxide exehange (LEGENDRE 1999). Rapid inereases in phytoplankton biomass have a high potential for exporting partieulate organie matter from the euphotie layer, providing important information for the study of global fluxes of earbon in the inland water systems; however, if a larger fraetion of assimilated earbon is respired at low than at high latitudes, a smaller proportion o f produetion ean be exported in tropieal regions. The explieit inelusion of eeosystem proeesses in models will permit eeologieal ehanges to be taken into aeeount, allow us to understand how the uptake o f C02 in inland water systems is likely to ehange in the future, and improve our understanding o f the loeal and regional climate systems. The main losses forbloom biomasses are grazing, deeomposition in the mixing layer, and sedimentation to the bottom of lakes (ZoHARY et al. 1998). The dominant size fraetion o f phytoplankton defines the principal transfer path ofbiogenie earbon in the eeosystem. When the small fraetion (<2 f..Lm) dominates, the main route will be nutrient reeycling through the mierobialloop in the euphotie zone. In eontrast, when the large fraetion (>2 f..Lm) dominates, new produetion will either be exported to the bottom o f the lake or eonsumed by herbivores and eventually exported as feeal pellets (LEGENDRE 1999). The aim ofthis study was to evaluate the vertieal and temporai variation ofseston fluxes inLake Alchiehiea to betterunderstand the earbon dynamies of a tropieal, oligotrophie lake where the large size fraetion ofphytoplankton dominates.","PeriodicalId":404196,"journal":{"name":"Internationale Vereinigung für theoretische und angewandte Limnologie: Verhandlungen","volume":"14 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":"128064858","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":"Insights on riverine metabolism from continuous measurements of CDOM fluorescence in Eastmain-1 Reservoir, Quebec","authors":"Y. Prairie, P. D. del Giorgio, C. Roehm, A. Tremblay","doi":"10.1080/03680770.2009.11902373","DOIUrl":"https://doi.org/10.1080/03680770.2009.11902373","url":null,"abstract":"Rivers are notorious1y variab1e. In contrast to 1akes where factors influencing the metabolic ba1ance of the ecosystem are fairly well constrained, rivers are typically more difficu1t to predict and genera1ize. In 1acustrine systems, the interp1ay between externa1 organic carbon 1oads and in-1ake metabo1ic processes (primary production, sediment accumu1ation, pe1agic and benthic respiration) is key to determining the net status of these systems, and simp1e ru1es app1y generally. For examp1e, in temperate and borea1 1akes, an upper thresho1d va1ue of5-6 mg L-1 DOC often constitutes the average concentration for net heterotrophic 1akes (HANSON et al. 2003). Surprising1y, this thresho1d is not very sensitive to the trophic status oflakes (PRAIRIE 2008). This dominance of respiration over primary production 1eads to co2 supersaturation and thus evasion to the atmosphere, a phenomenon observed in the majority of aquatic systems (COLE et al. 1994, DuARTE & PRAIRIE 2005).","PeriodicalId":404196,"journal":{"name":"Internationale Vereinigung für theoretische und angewandte Limnologie: Verhandlungen","volume":"3 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":"131333779","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":"EPT species distribution in 108 Alpine springs in Trentino (Italy)","authors":"B. Maiolini, L. Silveri","doi":"10.1080/03680770.2009.11902392","DOIUrl":"https://doi.org/10.1080/03680770.2009.11902392","url":null,"abstract":"(2010). EPT species distribution in 108 Alpine springs in Trentino (Italy) SIL Proceedings, 1922-2010: Vol. 30, No. 10, pp. 1639-1642.","PeriodicalId":404196,"journal":{"name":"Internationale Vereinigung für theoretische und angewandte Limnologie: Verhandlungen","volume":"108 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":"133982955","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":"Abstract: Zooplankton communities of hyposaline Pantanal lakes in Brazil","authors":"W. M. Silva, K. Roche, O. Rocha","doi":"10.1080/03680770.2009.11902370","DOIUrl":"https://doi.org/10.1080/03680770.2009.11902370","url":null,"abstract":"Zooplankton communities of hyposaline Pantanal lakes in Brazil W. M. Silva, K. F. Roche and O. Rocha Although the oeeurrenee ofhyposaline lakes is relatively rare in South Ameriea (ECHANIZ et al. 2006), they oeeur among the many lakes in the Nheeolandia region o f the Pantanal wetland. These water bodies have high eation eoneentrations, prineipally sodium and potassium, anions that include biearbonates, and they laek maerophytes and fish. Studies on the biotie eommunities of these lakes are searee; the diversity of the zooplankton has been found to be low when eompared with freshwater lakes (MÉDINA-JÚNIOR & RIETZLER 2005). We analyzed the zooplankton populations in 2 ofthese lakes; sampling was earried out in February 2005, at the en d o f the rainy season. Both lakes had high eonduetivities (mean values of 776 and 2659 JlS em-), high nutrient eoneentrations (mean values of590 and 999jlgP.L-), high ehlorophyll a eoneentrations (mean values of 55 and 52 jlg.L-), and high pH values (mean values of 9.2 and 9.5). The most abundant taxa reeorded were the eyclopoid Metacyclops mendocinus and rotifers Brachionus angularis and B. dimidiatus inermis, also found by GREEN & MENGESTOU (1991) in Afriean saline lakes. Up to 2300 ind.L-1 of B. angularis were found in the lake o f lower eonduetivity. Analyses of diurnal, seasonal, and inter-annual pattems o f ehange in the limnologieal eharaeteristies and plankton eommunities are ongoing, with the eventual aim of understanding the strueture and funetioning of these poorly studied systems.","PeriodicalId":404196,"journal":{"name":"Internationale Vereinigung für theoretische und angewandte Limnologie: Verhandlungen","volume":"2 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":"114755207","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":"Longitudinal patterns in nutrient chemistry and algal chlorophyll below point sources in three northern Ozark streams","authors":"K. Lohman, John R. Jones","doi":"10.1080/03680770.2009.11902376","DOIUrl":"https://doi.org/10.1080/03680770.2009.11902376","url":null,"abstract":"Stream water quality is strongly influenced by nutrient enrichment from both diffuse and point sources (JARVIE et al. 2006). Initial regulatory efforts in the United States to improve water quality largely focused on point sources because they are more easily identified and controlled than diffuse sources. In many locations nutrient enrichment from municipal point sources has been substantially reduced. Nutrient removal is expensive, however, and few small wastewater treatment plants (WWTP) include tertiary treatment to remove nitrogen and phosphorus. Nutrients from WWTP are an important component o f the overallload received by many streams. Diffuse sources can also deliver large nutrient loads to streams (CARPENTER et al. 1998, PERKINS et al. 1998). In rural areas, the impact of agriculturalland use can far exceed that ofpoint sources (CLESCERI et al. 1986), and where agriculture is widespread the consequential effects of nutrient enrichment may be evident across entire river basins. In contrast, point source impacts may be localized but also more intense, and the impairment caused by high nutrient concentrations in stream reaches directly below WWTP can be severe (HAGGARD et al. 2001, MARTI et al. 2004). Our objective was to determine the impact of WWTP effiuent on 3 small Missouri streams by measuring how far downstream nutrient concentrations remained elevated above background levels attributable to diffuse input from agricultural and forested watersheds.","PeriodicalId":404196,"journal":{"name":"Internationale Vereinigung für theoretische und angewandte Limnologie: Verhandlungen","volume":"57 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":"126013201","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":"Hydropower effects at different temporal scales in an Alpine river","authors":"M. Bruno, B. Maiolini, M. Carolli, L. Silveri","doi":"10.1080/03680770.2009.11902382","DOIUrl":"https://doi.org/10.1080/03680770.2009.11902382","url":null,"abstract":"In the last decade a strong scientific base has recognized that the pattems of temporal variation in river flows are the driving forces in structuring the function of riverine ecosystems (the \"natural flow-regime paradigm\"; PoFF et al. 1997). We analyzed the changes in flow regime of the river Adige, the second longest Italian river, which is strongly affected by the operation of 30 hydropower-producing reservoirs in its watershed. We used different temporal scales: (l) mean daily discharge data, recorded from 1923 to 2006, were used to evaluate alterations in the components o f the natural flow regime due to hydropower plants construction and operation; (2) the same data were analysed on a shorter timeframe (19972006) to identify the effects of changes in seasonal electricity demand and hydroelectric power plant management; and (3) the spatial and temporal effects of a single hydropeaking wave on benthic communities were assessed at sites in the first 8 km downstream o f a hydropower plant. We assessed the extent of catastrophic drift of invertebrates (CULP et al. 1985; i.e., generated by any disturbance) induced by a sharp rise in discharge and the ability of the different taxa to avoid the washout effect.","PeriodicalId":404196,"journal":{"name":"Internationale Vereinigung für theoretische und angewandte Limnologie: Verhandlungen","volume":"23 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":"124949002","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}