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

{"title":"Humic fingers — water pockets migrating through lake ice","authors":"K. Salonen, M. Pulkkanen, P. Salmi","doi":"10.1080/03680770.2009.11902398","DOIUrl":"https://doi.org/10.1080/03680770.2009.11902398","url":null,"abstract":"During freezing, lake water impurities are excluded from ice crystals (BELZILE et al. 2002). In fresh water the exclusion is efficient, and only few smallliquid inclusions develop along ice crystal boundaries (EICKEN 2003). In sea water the interface between solid and liquid water is lamellar rather than planar so that trapping o f impurities to intercrystalline pockets is greatly enhanced. Hence, freezing of sea water creates extensive network of brine pockets and drain channels. In lake ice, well-developed interna! channels develop in late spring as inereased solar radiation starts to erode the surfaees of ice erystals. These eavities grow larger and finally lead to the eollapse of iee strueture. Thus, freshwater iee cavities are more or less meltwater through-flow struetures with a short lifetime, whieh has major eonsequenees for the development of biota living in freshwater iee. In addition to iee formation at the ice-water interfaee, new iee ean develop on the surfaee of the primary ice. When the mass of snow eover exeeeds iee buoyancy, water penetrates the top o f the iee through eraeks, and the freezing o f resulting slush ereates snow iee. The freezing of slush starts from the surfaee and eoneentrates impurities in remaining unfrozen water. In this proeess pronouneed eoloured horizontal bands are produeed in snow iee. We studied the strueture and properties of iee in various lakes and ponds and found features that ehallenge the prevailing paradigm that lake iee eannot have struetures analogous to the brine pockets of sea iee.","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":"122304159","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":"Benthic algal diversity and biomass as indicators to establish reference streams in Puerto Rico","authors":"Diana Gualtero-Leal, G. Martínez, C. Santos-Flores, D. Sotomayor-Ramírez","doi":"10.1080/03680770.2009.11902377","DOIUrl":"https://doi.org/10.1080/03680770.2009.11902377","url":null,"abstract":"There is much interest in using biological indicators to determine the ecological state of an ecosystem (NIEMI & McDoNALD 2004). Benthic algal communities are often the dominant producers and principal energy source to higher trophic levels in rivers and streams, and are commonly used in studies related to water quality due to their fast response to environmental changes, such as nutrient loadings, in these aquatic systems. In tropical rivers, the benthic community size and structure has been characterized (VENKATESWARLU 1968, ÜLIVEIRA et al. 2001), and the relation between the algal groups such as diatoms and the degree of organic loading has been assessed (PATRICK 1964, PoDZORSKI 1985, cited in SILVA-BENAVIDES 1995). In the Caribbean, studies ofthe periphytic community and their relation with the riverine aquatic physicochemical condition are scarce (ÜRTIZ-ZAYAS et al. 2005). We analyzed the benthic algal composition and its relation with physicochemical variables of 5 streams located in areas ofminimum anthropogenic activity in Puerto Rico. Ihis work can serve as a reference point for evaluating the impact that increased nutrient Ioading has on stream water quality and indicator benthic organisms.","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":"130440421","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":"Species diversity of planktonic and epiphytic Rotifers in the Hordódi-Backwater (2005, 2006)","authors":"A. Tóth, K. Zsuga, K. Lőrincz, S. Nagy","doi":"10.1080/03680770.2009.11902363","DOIUrl":"https://doi.org/10.1080/03680770.2009.11902363","url":null,"abstract":"Littoral zones in freshwaters are challenging places to investigate. Although the plants themselves make study difficult, they structure the habitat in interesting ways, and examination of these places can provide insight to ecological processes such as community structure, especially for small metazoans such as rotifers. For example, macrophytes provide interstices for concealment from visual predators and offer spatial and temporal variability of microcimate, including oxygen concentration, pH, and temperature (DvoRAK 1970, VrTT & BAYLEY 1984). Moreover, rotifers have their greatest diversity in the littoral (PENNAK 1966, WALLACE et al. 2006). Rotifer abundance and diversity is high in the littoral, yet few studies have focused on their community structure in macrophyte dominated systems. W e examined the spatial and temporal diversity of a rotifer community in a backwater near the River Tisza, comprising a diverse vegetation complex of marsh, emerged, and submerged macrophytes.","PeriodicalId":404196,"journal":{"name":"Internationale Vereinigung für theoretische und angewandte Limnologie: Verhandlungen","volume":"41 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":"126340712","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":"Generalized regression analyses and spatial predictions of river fauna","authors":"A. Lehmann, P. Stucki, Y. Gonseth","doi":"10.1080/03680770.2009.11902391","DOIUrl":"https://doi.org/10.1080/03680770.2009.11902391","url":null,"abstract":"The study of large scale distribution of aquatic fauna along river habitats is relatively poorly developed when compared to its terrestrial counterpart, mainly because a proper spatial framework to analyze the observed distribution of aquatic fauna (macroinvertebrates and fishes) is often lacking. Interrestrial ecology, it has become very common and useful to derive potential distributions of species from point observations of species occurrences combined with GIS raster layers representing habitat characteristics along climatic, geological, and topographical gradients (LEHMANN et al. 2002a, ÜVERTON et al. 2002). In river ecology, examples of such an approach are still rare (LEATHWICK et al. 2006), certainly because of the difficulty in describing continuously linear habitats within GIS and integrating upstream influences on these habitats. We explored the potential contribution of Generalized Regression Analysis and Spatial Prediction (GRASP) to analyze, model, and predict aquatic species distribution along the river network of Switzerland.","PeriodicalId":404196,"journal":{"name":"Internationale Vereinigung für theoretische und angewandte Limnologie: Verhandlungen","volume":"29 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":"131539154","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":"Biogeochemistry of tropical lakes","authors":"W. Lewis","doi":"10.1080/03680770.2009.11902383","DOIUrl":"https://doi.org/10.1080/03680770.2009.11902383","url":null,"abstract":"Biogeochemical processes are drivenjointly by mass flux and metabolism, but biogeochemical contrasts across !atitude are more strongly related to metabolism than to mass flux. Metabolism can be expressed in terms ofmetabolic potential, which is regulated by temperature, irradiance, and chemical feedstocks (nutrients, electron acceptors, organic matter). Metabolic potential o f autotrophs in tropicallakes for a given nutrient supply is 2-4 times higher than in lakes of middle !atitude, mainly because tropical lakes have a higher rate of nutrient resupply to the mixed layer caused by their higher rates of vertical mass exchange between layers. Hypolimnetic waters o f tropical lakes are warm and thus have much higher metabolic potential than hypolimnetic waters of midlatitude lakes. Oxic metabolism often is suppressed by rapid loss of oxygen during stratification in tropicallakes. Prominence of deepwater anoxia in the tropics magnifies the importance of biogeochemical processes involving electron acceptors other than oxygen.","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":"128142128","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":"Dreissenid driving tests: going the “wrong” way in Green Bay, Lake Michigan?","authors":"Bart T. De Stasio, M. Schrimpf, A. Beranek, W. Daniels, Erik W. Hoyer","doi":"10.1080/03680770.2009.11902372","DOIUrl":"https://doi.org/10.1080/03680770.2009.11902372","url":null,"abstract":"Numero us studies o f the Laurentian Great Lakes have shown decreases in Chlorophyll-a (Chl-a) and phytoplankton abundance following invasion by the zebra mussel Dreissena po/ymorpha (LAVRENTYEV et al. 1995, IDRISI et al. 2001, BARBIERO et al. 2006, DEPEW et al. 2006). Zebra mussels filter large volumes of water and have the capacity to clear water of a wide range of particles. The largest embayment o f Lake Michigan is Green Bay, o ne o f the most productive ecosystems in the Laurentian Great Lakes. Extensive studies prior to invasion of the bay in 1992 by zebra mussels documented a large effect o f nutrient inflows from the Fox River, leading to a strong trophic gradient in the lower bay (RICHMAN et al. 1984, SAGER & RICHMAN 1991, DE STASIO & RICHMAN 1998). Early modeling studies predicted that zebra mussel filtering would lead to significant decreases in phytoplankton in the bay, especially in the well-mixed lower bay (PADILLA et al. 1996). Anecdotal observations did not support these predictions following the invasion, and here we document actual changes by determining average summer abundances of Chl-a and phytoplankton following the invasion of Green Bay by Dreissena polymorpha.","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":"132933594","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":"A new technique for paleolimnology: dating sediments using the optically stimulated luminescence signal from diatom frustules","authors":"J. Cornett, R. Cornett","doi":"10.1080/03680770.2009.11902394","DOIUrl":"https://doi.org/10.1080/03680770.2009.11902394","url":null,"abstract":"The determination of sediment ehronology, the age or date o f events and the aeeumulation rate of the sediments, is essential information in many paleolimnologie studies, including those of aretie systems. In some aretie systems as well as other environments (e.g., deltas) the often used isotopie methods of dating sueh as Pb-210, Cs-137, or C-14 are not easy to apply beeause the eoneentration and input of these isotopes is low, the key assumptions needed to ealculate the dates are violated, or the time period of interest does not mateh the radioaetive half life of the isotope (WOLFE et al. 2004). In an ideal world the ehronology ean be determined by several different teehniques, but often this is not possible and the ages ofthe ehronology end up being poorly eonstrained.","PeriodicalId":404196,"journal":{"name":"Internationale Vereinigung für theoretische und angewandte Limnologie: Verhandlungen","volume":"2 6 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":"124294526","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 food web structure of a large, deep saline lake","authors":"S. Chandra, L. Atwell, D. Mosely","doi":"10.1080/03680770.2009.11902386","DOIUrl":"https://doi.org/10.1080/03680770.2009.11902386","url":null,"abstract":"Pyramid Lake is a large ( 427 km) terminal desert lake, located within the boundaries ofthe Pyramid Lake Paiute Tribe Reservation in westem Nevada, United States. The lake historically supported a large fishery ofLahontan cutthroat trout (Oncorhynchus e/ar/d henshawi), hereafterreferred to as LeT, andcuiui ( Chasmistes cujus ). Both species are used by the nati v e Pyramid Lake Pai u te tribe an d commercia1 fisherman and can grow to large numbers and sizes (e.g., historically, LeT >9 kg were often caught). During the 1ate 1800s commercia1 fishermen harvested hundreds o f thousands of ki1ograms of LeT annually. Although LeT spend most o f their 1ives in the 1ake, they are obligate stream spawners an d historically migrated in to the Truckee River to spawn. After construction o f the Derby Dam in 1904 approximate1y 58 km upstream from Pyramid Lake, a large percentage ( 40-50%) of the river's flow was diverted each year. With low, to no flows entering the lake, the surface e1evation declined rapidly resu1ting in the formation of a 1arge delta at the mouth of the Truckee River. Annual spawning migration o f LeT from the 1ake to tributaries of the Truckee River ceased, and by 1942, the original strain of LeT was extinct. The cui-ui, a sucker endemic to Pyramid Lake a1so is an ob1igate stream spawner that declined in population and in 1967 was listed as an endangered species (SILGLER & KENNEDY 1976). Due to successfu1 recovery efforts however, the 1ake once again supports a trophy fishery for LeT as well as a 1ess well-known fishery for Sacramento perch, the lake's on1y introduced fish. eurrently, the LeT and cui-ui fishery is supported by hatchery operations run by Pyramid Lake Fisheries and the U. S. Fish and Wildlife Service. Previous research has identified the sources of nutrient inputs and 1osses, primary productivity, and other 1imno1ogical processes in Pyramid Lake (SIGLER & KENNEDY 1978, LocKHEED ÜCEAN SciENCE LABORATORIEs 1982, GALAT 1981 ). A thorough investigation of food web dynamics has not been conducted after the introductions ofboth cui-ui and LeT through hatchery introductions. Recently, a contemporary \"snap shot\" o f the 1ake 's fishery was undertaken by MaNDA ( 1999) with the goa1 o f determining the status o f fish populations in the lake. Much of the diet data suggest potentia1 competition and 1imitation offood resources for Pyramid Lake fish. eompetition occurs particular1y between LeT, chub, and Sacramento perch. The goa! ofthis study was to provide a contemporary ana1ysis of tropho-dynarnics of the Pyramid Lake. Specifically, the objectives were to (l) deterrnine the food web structure and energetics from different habitats (benthic o r pe1agic) that contribute to fisheries production; (2) determine the contribution of pe1agic energy to benthic invertebrate production; and (3) inform the tribe of the habitat factors that may need to be incorporated into their 1ong term monitoring program.","PeriodicalId":404196,"journal":{"name":"Internationale Vereinigung für theoretische und angewandte Limnologie: Verhandlungen","volume":"49 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":"125101517","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":"Vertical distribution of invertebrates in red snow (Akashibo) at Ozegahara mire, Central Japan","authors":"H. Fukuhara, A. Ohtaka, N. Kimura, Masahiko Ochiai, Yoko Yamamoto","doi":"10.1080/03680770.2009.11902361","DOIUrl":"https://doi.org/10.1080/03680770.2009.11902361","url":null,"abstract":"Snow patches colored red, pink, yellow, green, or black containing many species of algae, bacteria, and fungi have been reported in Arctic and Antarctic Zones or on high mountains, as well as on glaciers (FuKUSHIMA 1963, KoL 1964, 1968). Many studies have reported that the red co1or was caused by the cells of Chlamydomonas or Chloromonas as the main a1gae in the northem and southem hemispheres (NEWTON 1982, LING 1996, MULLER et al. 1998). We report preliminari1y on a red snow, the so-called Ak:ashibo, in the Ozegahara mire, Central Japan. lt is a unique type ofred snow with the following characteristics: (l) its dominant red cells, Hemitoma sp., have meandering rib-structures made from ferric oxides (YAMAMOTO et al. 2006a) rather than carotenoid pigments as sources of its colored cells; (2) many species of small invertebrates (e.g., nematodes, halpacticoids, tardigrades, oligochaetes, larvae of tipulids, ceratopogonids, and chironomids), are found in the Akashibo snow patches; and (3) the red substances that constitute the Akashibo remain on the surface of peat after snow melts (FuKuHARA et al. 2002, 2006, YAMAMOTO et al. 2006b ). Though i t is known that some invertebrates, a very few species of aquatic insects, crustaceans, rotifers, and tardigrades, live on or in ice or snow and in ice melt mini-habitats such as cryoconite-holes, pockets of soil sediments or ice-mats ('IYNEN 1970, KOHSHIMA 1984, 1994, MACINTYER 1984, KIKUCHI 1994, VINCENT et al. 2004, JOHNSON et al. 2006), we believe only our reports have examined nival fauna with relatively large body sizes and high population densities in red snow (FUKUHARA et al. 2002, 2006). Here we describe movements o f nival invertebrates in the Akashibo snow o f the Ozegahara mire with reference to the cause o f their migration from subnivean (under the snow) to intranivean (within snow) and supranivean (on snow).","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":"128843925","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":"Verhandlungen Epilogue","authors":"J. Jones","doi":"10.1080/03680770.2009.11902399","DOIUrl":"https://doi.org/10.1080/03680770.2009.11902399","url":null,"abstract":"","PeriodicalId":404196,"journal":{"name":"Internationale Vereinigung für theoretische und angewandte Limnologie: Verhandlungen","volume":"11 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":"127413644","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}