@article{WichmannJeltschDeanetal.2002, author = {Wichmann, Matthias and Jeltsch, Florian and Dean, Richard and Moloney, Kirk A. and Wissel, Christian}, title = {Does climate change in arid savanna affect the population persistence of raptors?}, year = {2002}, language = {en} } @article{WichmannJeltschDeanetal.2002, author = {Wichmann, Matthias and Jeltsch, Florian and Dean, Richard and Moloney, Kirk A. and Wissel, Christian}, title = {Weather does matter : simulating population dynamics of tawny eagle (Aquila rapax) under various rainfall scenarios}, year = {2002}, language = {en} } @article{Wichmann2002, author = {Wichmann, Matthias}, title = {Survival in changing environments : modeling the impact of climate change and land use on raptors in arid savanna}, pages = {103 S.}, year = {2002}, language = {en} } @article{WeyhenmeyerAdrianGaedkeetal.2002, author = {Weyhenmeyer, G. A. and Adrian, Rita and Gaedke, Ursula and Livingstone, D. M. and Maberly, Stephen C.}, title = {Response of phytoplankton in European lakes to a change in the North Atlantic Oscillation}, issn = {0368-0770}, year = {2002}, language = {en} } @article{WernerBehrsingScharteetal.2002, author = {Werner, Deljana and Behrsing, Olaf and Scharte, Gudrun and Woller, Jochen and Steup, Martin and Micheel, Burkhard}, title = {Monoclonal anti-diuron antibodies prevent inhibition of photosynthesis by diuron}, year = {2002}, language = {en} } @article{WackervonElert2002, author = {Wacker, Alexander and von Elert, Eric}, title = {Strong influences of larval diet history on subsequent post-settlement growth in the freshwater mollusc Dreissena polymorpha}, year = {2002}, abstract = {A significant seasonal variation in size at settlement has been observed in newly settled larvae of Dreissena polymorpha in Lake Constance. Diet quality, which varies temporally and spatially in freshwater habitats, has been suggested as a significant factor influencing the life history and development of freshwater invertebrates. Accordingly, experiments were conducted with field-collected larvae to test the proposal that diet quality can determine planktonic larval growth rates, size at settlement and subsequent post-metamorphic growth rates. Larvae were fed one of two diets or starved. One diet was composed of cyanobacterial cells, which are de; cient in polyunsaturated fatty acids (PUFAs) and the other was a mixed diet rich in PUFAs. Freshly metamorphosed animals from the starvation treatment had a carbon content per individual 70\% lower than that of larvae fed the mixed diet. This apparent exhaustion of larval internal reserves resulted in a 50\% reduction of the post-metamorphic growth rates. Growth was also reduced in animals previously fed the cyanobacterial diet. Hence, low food quantity or low food quality during the larval stage of D. polymorpha, lead to irreversible effects for post-metamorphic animals and are related to inferior competitive abilities.}, language = {en} } @article{WackerBechervonElert2002, author = {Wacker, Alexander and Becher, Paul and von Elert, Eric}, title = {Food quality effects of unsaturated fatty acids on larvae of the zebra mussel Dreissena polymorpha}, year = {2002}, abstract = {In standardized growth experiments, newly hatched larvae of the zebra mussel Dreissena polymorpha were fed diets representing different biochemical compositions. Algae that were rich in (n-3) polyunsaturated fatty acids (PUFAs), except for long-chained (.C18) PUFAs (Chlorella minutissima and Monoraphidium minutum) were of low food quality. Higher growth than on C. minutissima or M. minutum was supported by a culture of the cyanobacterium Aphanothece sp., which contained traces of a long-chained (n-3) PUFA, docosahexaenoic acid (DHA, 22 : 6n-3). The alga Isochrysis aff. galbana, which contained high amounts of the longchained (n-3) PUFAs DHA and eicosapentaenoic acid (EPA, 20 : 5n- 3), supported the highest growth. The alga Nannochloropsis limnetica, which differed from I. galbana by a defi- ciency in DHA, allowed slightly, but significantly lower, growth. Growth of larvae on N. limnetica was increased by enrichment of N. limnetica cells with a lipid extract of I. galbana, showing that larval growth on N. limnetica was limited by the deficiency of a compound that was present in I. galbana. Growth was also enhanced by feeding N. limnetica cells supplemented with DHA, but not by cells enriched with EPA, indicating that DHA was the limiting factor. We conclude that, on DHA-deficient food, the larvae of D. polymorpha were not able to sufficiently convert C18-PUFAs into long- chained (n-3) PUFAs and that the rates for elongation and desaturation of EPA into DHA limited growth.}, language = {en} } @article{VernesiPecchioliTiedemannetal.2002, author = {Vernesi, C. and Pecchioli, E. and Tiedemann, Ralph and Randi, E. and Bertorelle, G.}, title = {The genetic structure of natural and reintroduced roe deer (Capreolus capreolus) populations in the Alps and central Italy, with reference to the mitochondrial DNA phylogeography of Europe}, issn = {0962-1083}, year = {2002}, language = {en} } @article{TschoepeBurkartTielboerger2002, author = {Tsch{\"o}pe, Okka and Burkart, Michael and Tielb{\"o}rger, Katja}, title = {Habitat management in former military training area by means of Megaherbivores}, year = {2002}, language = {en} } @article{StoellnerStoeckleinSchelleretal.2002, author = {St{\"o}llner, Daniela and St{\"o}cklein, Walter F. M. and Scheller, Frieder W. and Warsinke, Axel}, title = {Membrane-immobilized haptoglobin as affinity matrix for a hemoglobin-A1c-immunosensor}, year = {2002}, language = {en} } @article{StoellnerSchellerWarsinke2002, author = {Stoellner, Daniela and Scheller, Frieder W. and Warsinke, Axel}, title = {Activation of cellulose membranes with 1,1{\"i}-carbonyldiimidazole or 1-cyano-4-4-dimethylaminopyridinium tetrafluoroborate as a basis for the development of immunosensors}, year = {2002}, language = {en} } @article{ShertzerEllnerFussmannetal.2002, author = {Shertzer, Kyle W. and Ellner, Stephen P. and Fussmann, Gregor F. and Hairston, Nelson G.}, title = {Predator-prey cycles in an aquatic microcosm : testing hypotheses of mechanism}, year = {2002}, abstract = {1. Fussmann et al. (2000) presented a simple mechanistic model to explore predator-prey dynamics of a rotifer species feeding on green algae. Predictions were tested against experimental data from a chemostat system housing the planktonic rotifer Brachionus calyciflorus and the green alga Chlorella vulgaris. 2. The model accurately predicted qualitative behaviour of the system (extinction, equilibria and limit cycles), but poorly described features of population cycles such as the period and predator-prey phase relationship. These discrepancies indicate that the model lacked some biological mechanism(s) crucial to population cycles. 3. Here candidate hypotheses for the 'missing biology' are quantified as modifications to the existing model and are evaluated for consistency with the chemostat data. The hypotheses are: (1) viability of eggs produced by rotifers increases with food concentration, (2) nutritional value of algae increases with nitrogen availability, (3) algal physiological state varies with the accumulation of toxins in the chemostat and (4) algae evolve in response to predation. 4. Only Hypothesis 4 is compatible with empirical observations and thus may provide important insight into how prey evolution affects predator- prey dynamics.}, language = {en} } @article{SellrieSchenkBehrsingetal.2002, author = {Sellrie, Frank and Schenk, J{\"o}rg A. and Behrsing, Olaf and Bottger, Volker and Micheel, Burkhard}, title = {A competitive immunoassay to detect a hapten using an enzyme-labelled peptide mimotope as tracer}, year = {2002}, abstract = {Mimotope peptides-peptides which mimic the binding of a hapten to its corresponding monoclonal antibody-were conjugated to peroxidase and used in competitive immunoassay. The established immunoassay was used to quantitatively determine the concentration of hapten. As model system in all the experiments described here, we used the binding of the monoclonal antibody B13-DE1 to fluorescein and the corresponding peptide mimotope.}, language = {en} } @phdthesis{Schmidt2002, author = {Schmidt, Ulrike}, title = {Characterisation of the guard cell-specific phosphoenolpyruvate carboxylase and PEPC kinases from Solanum tuberosum}, pages = {108 S.}, year = {2002}, language = {en} } @article{Schenk2002, author = {Schenk, J{\"o}rg A.}, title = {Two Hybrid cDNA Cloning}, year = {2002}, language = {en} } @article{SchellerWollenbergerLeietal.2002, author = {Scheller, Frieder W. and Wollenberger, Ursula and Lei, Chenghong and Jin, Wen and Ge, Bixia and Lehmann, Claudia and Lisdat, Fred and Fridman, Vadim}, title = {Bioelectrocatalysis by redox enzymes at modified electrodes}, year = {2002}, language = {en} } @article{SchellerBauerMakoweretal.2002, author = {Scheller, Frieder W. and Bauer, Christian G. and Makower, Alexander and Wollenberger, Ursula and Warsinke, Axel and Bier, Frank Fabian}, title = {Immunoassays using enzymatic amplification electrodes}, isbn = {0-7484-0791-X}, year = {2002}, language = {en} } @article{Scheffler2002, author = {Scheffler, Christiane}, title = {A stature of one meter : how is the variability?}, year = {2002}, language = {en} } @article{RitteLloydEckermannetal.2002, author = {Ritte, Gerhard and Lloyd, James R. and Eckermann, Nora and Rottmann, Antje and Kossmann, Jens and Steup, Martin}, title = {The starch-related R1 protein is an a-glucan, water dikinase}, issn = {0027-8424}, year = {2002}, language = {en} } @article{ReimannRitteSteupetal.2002, author = {Reimann, Rezarta and Ritte, Gerhard and Steup, Martin and Appenroth, Klaus-J.}, title = {Association of a-amylase and the R1 protein with starch granules precedes the initiation of net starch degradation in turions of Spirodela polyrhiza}, issn = {0031-9317}, year = {2002}, language = {en} } @article{Pfeil2002, author = {Pfeil, Wolfgang}, title = {The influence of glycosylation on the thermal stability of ribonuclease}, year = {2002}, language = {en} } @article{NistorRoseFarreetal.2002, author = {Nistor, C. and Rose, Andreas and Farre, M. and Stoica, L. and Wollenberger, Ursula and Ruzgas, T. and Pfeiffer, Dorothea and Barcelo, Damia and Gorton, Lo and Emneus, J.}, title = {In-field monitoring of cleaning efficiency in waste water treatment plants using two phenolsensitive biosensors}, year = {2002}, language = {en} } @article{NistorOsvikDavidssonetal.2002, author = {Nistor, C. and Osvik, A. and Davidsson, R. and Rose, Andreas and Wollenberger, Ursula and Pfeiffer, Dorothea and Emneus, J. and Fiksdal, L.}, title = {Detection of escherichia coli water by culture-based amperometric and luminometric methods}, year = {2002}, language = {en} } @article{LeiWollenbergerBistolasetal.2002, author = {Lei, Chenghong and Wollenberger, Ursula and Bistolas, Nikitas and Guiseppi-Eli, A. and Scheller, Frieder W.}, title = {Electron transfer of hemoglobin at electrodes modified with colloidal clay nanoparticles}, year = {2002}, language = {en} } @article{LeGrimellecGiocondiLenoiretal.2002, author = {LeGrimellec, Christian and Giocondi, Marie-Cecile and Lenoir, Marc and Vater, Marianne and Sposito, Gerard and Pujol, Remy}, title = {High-resolution three-dimensional imaging of the lateral plasma membrane of cochlear outer hair cells by atomic force microscopy}, year = {2002}, language = {en} } @article{KoschorreckTittel2002, author = {Koschorreck, Matthias and Tittel, J{\"o}rg}, title = {Benthic photosynthesis in an acidic mining lake (pH 2.6).}, year = {2002}, language = {en} } @article{KoschorreckFroemmichenHerzsprungetal.2002, author = {Koschorreck, Matthias and Fr{\"o}mmichen, Ren{\´e} and Herzsprung, Peter and Tittel, J{\"o}rg and Wendt-Potthoff, Katrin}, title = {Function of straw for in situ remediation of acidic mining lakes}, issn = {0049-6979}, year = {2002}, language = {en} } @article{KamjunkeSchmidtPflugmacheretal.2002, author = {Kamjunke, Norbert and Schmidt, Katja and Pflugmacher, Stephan and Mehner, Thomas}, title = {Consumption of cyanobacteria by roach (Rutilus rutilus) : useful or harmful to the fish?}, year = {2002}, abstract = {1. The ability of roach to use cyanobacterial food is generally believed to be one reason for the dominance of roach over perch in eutrophic European lakes. The aim of this study was to test whether cyanobacteria really are a suitable food for juvenile roach. Special attention was paid to differences between the two cyanobacteria species Aphanizomenon and Microcystis which are common in eutrophic lakes and are ingested by roach there. 2. We performed growth and behaviour experiments with juvenile roach fed with zooplankton and the different cyanobacteria. Growth rate with Aphanizomenon was lower than with Daphnia but significantly higher than without food, whereas growth rate with Microcystis was as low as without food. 3. In cultivation experiments of roach faeces, Microcystis was found not to have been digested and grew exponentially after passing through the gut whereas Aphanizomenon stayed at low biomass. Differences in growth were not related to the toxin content of cyanobacteria. Investigations of roach motility showed no differences whether fed Aphanizomenon or Microcystis. 4. In contrast to Microcystis, Aphanizomenon can be regarded as a suitable food source for juvenile roach probably due to its better digestability. We conclude that the ability to feed on cyanobacteria is not a general competitive advantage for roach, but the outcome depends on the species composition of the cyanobacteria.}, language = {en} } @article{KamjunkeMendoncaHardewigetal.2002, author = {Kamjunke, Norbert and Mendonca, Rebeca and Hardewig, Iris and Mehner, Thomas}, title = {Assimilation of different cyanobacteria as food and the consequences for internal energy stores of juvenile roach}, year = {2002}, abstract = {Juvenile roach (Rutilus rutilus L.) fed on the cyanobacterium Aphanizomenon were able to maintain liver glycogen and muscle protein concentrations. In contrast, internal energy stores of fish fed on the cyanobacterium Microcystis were degraded. However, liver glycogen was higher than in starved fish, suggesting that roach was able to obtain some nutrients (probably carbohydrates) from the mucus cover of Microcystis. Weak assimilation of radiolabeled Microcystis by roach was detectable, and assimilation rates increased with increasing proportion of Aphanizomenon in a mixture of both cyanobacteria. We conclude that the incomplete digestion of Microcystis was the main reason for the negative growth rates of roach when fed on this cyanobacterium species.}, language = {en} } @article{IgnatovShishniashviliGeetal.2002, author = {Ignatov, S. and Shishniashvili, D. and Ge, Bixia and Scheller, Frieder W. and Lisdat, Fred}, title = {Amperometric biosensor based on a functionalized gold electrode for the detection of antioxidants}, year = {2002}, language = {en} } @article{HairstonFussmann2002, author = {Hairston, Nelson G. and Fussmann, Gregor F.}, title = {Lake ecosystems}, year = {2002}, abstract = {Lakes are discrete, largely isolated ecosystems in which the interplay between physical, biogeochemical and organismal processes can be studied, understood, and put to use in effective management.}, language = {en} } @article{GrunwaldtHaebelSpitzetal.2002, author = {Grunwaldt, Gisela and Haebel, Sophie and Spitz, Christian and Steup, Martin and Menzel, Ralf}, title = {Multiple binding sites of fluorescein isothiocyanate moieties on myoglobin : photophysical heterogeneity as revealed by ground- and excited-state spectroscopy}, issn = {1011-1344}, year = {2002}, language = {en} } @article{GeLisdat2002, author = {Ge, Bixia and Lisdat, Fred}, title = {Superoxide sensor based on cytochrome c immobilized on mixed-thiol SAM with a new calibration method}, year = {2002}, language = {en} } @article{GaedkeHochstaedterStraile2002, author = {Gaedke, Ursula and Hochst{\"a}dter, Silke and Straile, Dietmar}, title = {Interplay between energy limitation and nutritional deficiency: Empirical data and food web models}, year = {2002}, abstract = {Due to differences in the biochemical composition of autotrophs and their grazers, food quality can strongly influence herbivore population dynamics. Under nutrient depleted conditions the carbon to nutrient ratios of autotrophs can increase to such an extent that consumers become nutrient rather than energy limited. Estimating the importance of this effect in situ in pelagic food webs is complicated by the omnivory of many consumers and rapid nutrient recycling. Isolated predator-prey studies inadequately represent this interaction, instead an ecosystem perspective is required. We used seven years of data from large, deep Lake Constance to develop seasonally resolved flux models of the pelagic food web and analyze the balance between energetic and nutrient constraints. The carbon (C) and phosphorus (P) flows were simultaneously quantified and balanced. C represented food quantity/energy. P was taken as a surrogate of food quality, because algal C:P ratios exceeded the threshold above which P limitation of herbivores is predicted by stoichiometric theory throughout summer and autumn. Primary production exceeded bacterial C production by a factor of 3 but autotrophs and bacteria took up approximately equal amounts of P during summer and autumn. As a consequence the C and P supply of suspension-feeding zooplankton was decoupled: Consumer C demands were largely met by phytoplankton whereas P was mostly obtained from bacteria and their protist predators. The degree of consumer P deficiency varied according to supplementation of their algal diet with P-enriched bacteria or bacterivores. This favored the occurrence of omnivores, i.e. organisms that minimized P deficiencies at the cost of enhanced energy limitation. In contrast with previous perceptions, P remineralization during P depleted summer conditions was dominated by bacterivorous flagellates, carnivorous crustaceans and fish, which fed on prey with an elemental composition similar to their own, whereas herbivores contributed only 30\% of P cycling despite their large biomass and C production. Our results suggested a co- limitation of predominantly herbivorous consumers by C and P and a mutual dependence of the two types of deficiency at the individual and system level. This pattern is not specific to pelagic systems but appears to be applicable across ecosystem types.}, language = {en} } @article{FussmannHeber2002, author = {Fussmann, Gregor F. and Heber, Gerd}, title = {Food web complexity and chaotic population dynamics}, year = {2002}, abstract = {In mathematical models, very simple communities consisting of three or more species frequently display chaotic dynamics which implies that long-term predictions of the population trajectories in time are impossible. Communities in the wild tend to be more complex, but evidence for chaotic dynamics from such communities is scarce. We used supercomputing power to test the hypothesis that chaotic dynamics become less frequent in model ecosystems when their complexity increases. We determined the dynamical stability of a universe of mathematical, nonlinear food web models with varying degrees of organizational complexity. We found that the frequency of unpredictable, chaotic dynamics increases with the number of trophic levels in a food web but decreases with the degree of complexity. Our results suggest that natural food webs possess architectural properties that may intrinsically lower the likelihood of chaotic community dynamics.}, language = {en} } @article{FischerPflugshauptKollmannetal.2002, author = {Fischer, Markus and Pflugshaupt, K. and Kollmann, J. and Roy, B.}, title = {Pollen quantity and quality affect fruit abortion in small populations of a rare fleshy-fruited shrub}, year = {2002}, language = {en} } @article{FischerLienertSchnelleretal.2002, author = {Fischer, Markus and Lienert, J. and Schneller, J. and Diemer, M.}, title = {Local extinctions of the wetland specialist Swertia perennis : a revistation study based on herbarium records}, year = {2002}, language = {en} } @article{FischerGaleuchetHusietal.2002, author = {Fischer, Markus and Galeuchet, D. and Husi, R. and Perret, C. and Gautschi, B.}, title = {Characterization of microsatellite loci in Lychnis flos-cuculi.}, year = {2002}, language = {en} } @article{Fischer2002, author = {Fischer, Markus}, title = {Isozyme variability of the wetland specialist Swertia perennis (Gentianaceae) in relation to habitat size, isolation and to plant fitness}, year = {2002}, language = {en} } @article{Fischer2002, author = {Fischer, Markus}, title = {Positive biodiversity-production relationships : towards mechanisms}, issn = {0169-5347}, year = {2002}, language = {en} } @article{Fischer2002, author = {Fischer, Markus}, title = {Effect of low-intensity grazing on the species-rich vegetation of traditionally mown subalpine meadows}, year = {2002}, language = {en} } @article{EckermannFettkeSteup2002, author = {Eckermann, Nora and Fettke, J{\"o}rg and Steup, Martin}, title = {Identification of polysaccharide binding proteins by affinity electrophoresis in inhomogeneous polyacrylamide gels and subsequent SDS-PAGE/MALDI-TOF analysis}, year = {2002}, language = {en} } @article{ButtermeyerPhilippMalletal.2002, author = {Buttermeyer, R. and Philipp, A. W. and Mall, J. W. and Ge, Bixia and Scheller, Frieder W. and Lisdat, Fred}, title = {In vivo measurement of oxygen derived free radicals during reperfusion injury}, year = {2002}, language = {en} } @misc{BellVincent2002, author = {Bell, Elanor M. and Vincent, Amanda C. J.}, title = {Art.: Gasterosteiform}, year = {2002}, language = {en} } @article{BaumannDamesKuehneletal.2002, author = {Baumann, Otto and Dames, Petra and K{\"u}hnel, Dana and Walz, Bernd}, title = {Distribution of serotonergic and dopaminergic nerve fibers in the salivary gland complex of the cockroach Periplaneta americana}, year = {2002}, language = {en} } @article{AltmannvonGrollBerger2002, author = {Altmann, Thomas and von Groll, Uritza and Berger, Dieter}, title = {The subtilisin-like serine protease SDD1 mediates cell-cell signaling during Arabidopsis stomatal development}, year = {2002}, language = {en} } @article{AltmannUdvardiEssigmannetal.2002, author = {Altmann, Thomas and Udvardi, M. K. and Essigmann, B. and Colebatch, G. and Kloska, Sebastian and Smith, P. and Trevaskis, B.}, title = {Lotus japonicus functional genomics : cDNA microarray analysis uncovers novel nodulins}, isbn = {0-85199-591-8}, year = {2002}, language = {en} } @article{AltmannSchlueterKoepkeetal.2002, author = {Altmann, Thomas and Schl{\"u}ter, U. and K{\"o}pke, D. and M{\"u}ssig, Carsten}, title = {Analysis of carbohydrate metabolism of CPD antisense plants and the brassinosteroid-deficient cbb1 mutant}, year = {2002}, language = {en} } @article{AltmannMuessigFischer2002, author = {Altmann, Thomas and M{\"u}ssig, Carsten and Fischer, Sabine}, title = {Brassinosteroid-regulated gene expression}, year = {2002}, language = {en} } @article{AltmannColebatchKloskaetal.2002, author = {Altmann, Thomas and Colebatch, G. and Kloska, Sebastian and Trevaskis, B. and Freund, S. and Udvardi, M. K.}, title = {Novel aspects of symbiotic nitrogen fixation uncovered by transcript profiling with cDNA arrays}, year = {2002}, language = {en} }