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  • 1
    Language: English
    In: International Review of Hydrobiology, October 2010, Vol.95(4‐5), pp.298-312
    Description: Pollution, overexploitation and climate warming endanger the freshwater ecosystems in many regions, particularly in developing countries. This publication asks if at least the BRIC (Brazil, Russia, India and China) group and the Outreach countries (in addition South Africa and Mexico), have the scientific capacity in limnology to mitigate this development. For this reason the scientific output was analyzed between 1999 and 2007. With a share of 5.0% of all limnological papers in 2007 world wide the P.R. China (Peoples Republic of China) produced the largest numbers of publications, followed by Brazil and Mexico. For comparison, this year Germany's share was 5.8% and the USA had the highest share with 33.9%. The growth rate was also highest for the P. R. China and Brazil. Based on the journal impact factors, China's quality of papers was best followed by South Africa and Russia. Brazil was strong in fish biology, whereas China published the most papers in all other disciplines. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
    Keywords: Bibliometry ; Developing Countries ; Germany ; Usa ; Freshwater Ecology
    ISSN: 1434-2944
    E-ISSN: 1522-2632
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  • 2
    Language: English
    In: Journal of Applied Ecology, 1 August 2011, Vol.48(4), pp.916-925
    Description: 1. Shoreline development and the associated loss of littoral habitats represent a pervasive alteration of the ecological integrity of lakes and have been identified as major drivers for the loss of littoral biodiversity world-wide. Little is known about the effects of shoreline development on the structure of, and energy transfer in, littoral food webs, even though this information is urgently needed for management and mitigation measures. 2. We measured macroinvertebrate biomass and analysed potential food resources using stable isotopes (δ¹³C, δ¹⁵N) and mixing models to compare the complexity and the trophic base of littoral food webs between undeveloped and developed shorelines in three North German lowland lakes. 3. The lower diversity of littoral habitats found at developed shorelines was associated with lower diversity of food resources and consumers. Consequently, the number of trophic links in food webs at developed shorelines was up to one order of magnitude lower as compared with undeveloped shorelines. 4. Mixing model analysis showed that consumer biomass at undeveloped shorelines was mainly derived from the particulate organic matter (FPOM) and coarse particulate organic matter of terrestrial origin (CPOM). The contribution of CPOM to consumer biomass was twofold lower at developed shorelines, and consumer biomass was mainly derived from FPOM and suspended particulate organic matter. 5. Synthesis and application. Shoreline development impacts the flow of organic matter within littoral food webs primarily through the reduction in littoral habitat diversity. These effects are exacerbated by clearcutting of the riparian vegetation, which disrupts cross-boundary couplings between the riparian and the littoral zone. Lakeshore conservation should focus on preserving the structural integrity of the littoral zone, while restoration of coarse woody debris, reed and root habitats can be a cost-efficient measure to improve degraded lakeshores. The local effects of shoreline development demonstrated in this study might lead to whole-lake effects, but future studies are needed to derive thresholds at which shoreline development has consequences for the structure and functioning of the entire ecosystem.
    Keywords: Vegetation and Community ecology
    ISSN: 00218901
    E-ISSN: 13652664
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  • 3
    In: Canadian Journal of Fisheries and Aquatic Sciences (Journal canadien des sciences halieutiques et aquatiques), 2011, Vol.68(1), pp.74-88
    Description: We compared the invertebrate production and stable isotope signatures of key ecosystem compartments of urban sites subjected to the input of tertiary-treated wastewater with those of upstream sites in an agricultural lowland stream. We detected a significant shift in the trophic basis of invertebrate production from upstream, natural and agricultural resources, to urban resources, i.e., wastewater-derived organic matter as well as autochthonous primary production based on wastewater-derived nutrients. Invertebrate production was higher at urban sites than at agricultural sites. However, the median contribution of the most important secondary producer, the shredder Gammarus roeseli , to total invertebrate production was lower at urban sites (9%) than at agricultural sites (61%). The low production of G. roeseli at urban sites was associated with the absence of allochthonous coarse particulate organic matter (CPOM) habitats, rather than the loss of CPOM as a food resource. Our results suggest that contemporary urban stressors in developed countries affect secondary producers less severely than historically recorded, but still profoundly change the matter fluxes and ecosystem functioning of running waters. Restoration of the native riparian vegetation, channel naturalization, and adequate dilution of tertiary-treated wastewater may partially mitigate adverse effects on invertebrate communities and their secondary production.
    Description: Nous comparons la production d'invertbrs et les signatures d'isotopes stables de compartiments cls de l'cosystme dans des sites urbains soumis l'apport d'eaux uses de traitement tertiaire par comparaison des sites d'amont dans un cours d'eau agricole de plaine. Nous dtectons un changement significatif dans la base trophique de la production d'invertbrs, partir des ressources naturelles et agricoles en amont vers des ressources urbaines, c'est--dire de la matire organique drive des eaux uses, ainsi qu'une production primaire autochtone base sur des nutriments provenant des eaux uses. La production d'invertbrs est plus leve dans les sites urbains que dans les sites agricoles. Cependant, la contribution mdiane du producteur secondaire le plus important, le dchiqueteur Gammarus roeseli , la production totale des invertbrs est plus basse aux sites urbains (9 %) qu'aux sites agricoles (61 %). La faible production de G. roeseli aux sites urbains est associe l'absence d'habitats matire organique particulaire grossire (CPOM) allochtone, plutt qu' la perte de CPOM comme ressource alimentaire. Nos rsultats laissent croire que les facteurs urbains actuels de stress dans les pays dvelopps affectent les producteurs secondaires moins svrement que signal dans le pass, mais qu'ils modifient nanmoins profondment les flux de matire et le fonctionnement de l'cosystme dans les eaux courantes. La restauration de la vgtation riveraine indigne, la naturalisation du chenal et la dilution adquate des eaux uses aprs un traitement tertiaire peuvent en partie rduire les effets ngatifs sur les communauts d'invertbrs et leur production secondaire.
    Keywords: Rivers ; Isotopes ; Ecosystems ; Environmental Impact ; Pollution Effects ; Trophic Structure ; Particulate Organic Matter ; Freshwater Organisms ; Secondary Production ; Waste Water ; Agricultural Runoff ; Chemical Analysis ; Pollution ; Gammarus Roeseli ; Germany, Erpe R. ; Freshwater ; Mechanical and Natural Changes ; Productivity;
    ISSN: 0706-652X
    E-ISSN: 1205-7533
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  • 4
    Language: English
    In: Hydrobiologia, 2011, Vol.662(1), pp.1-4
    Description: Issue Title: Rotifera XII: New aspects in rotifer evolution, genetics, reproduction, ecology and biogeography / N. Walz, R. Adrian, J.J. Gilbert, M.T. Monaghan, G. Weithoff & H. Zimmermann-Timm
    Keywords: Life Sciences ; Zoology ; Ecology ; Freshwater & Marine Ecology ; Biology ; Oceanography ; Zoology ; Ecology;
    ISSN: 0018-8158
    E-ISSN: 1573-5117
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  • 5
    Language: English
    In: Hydrobiologia, 2011, Vol.662(1), pp.5-9
    Description: Issue Title: Rotifera XII: New aspects in rotifer evolution, genetics, reproduction, ecology and biogeography / N. Walz, R. Adrian, J.J. Gilbert, M.T. Monaghan, G. Weithoff & H. Zimmermann-Timm
    Keywords: Life Sciences ; Zoology ; Ecology ; Freshwater & Marine Ecology ; Biology ; Oceanography ; Zoology ; Ecology;
    ISSN: 0018-8158
    E-ISSN: 1573-5117
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  • 6
    Language: English
    In: Hydrobiologia, 2005, Vol.546(1), pp.1-8
    Description: Walter Koste is one of the architects of modern rotiferology. Here I take a look at his scientific career using ecological concepts. Although he has more than 150 publications to his credit, he did not start publishing his works on rotifers before the age of 49, and then most of his publications appeared after his retirement. Long life and late reproduction are characteristics for K-strategists. Thus, it appears that Koste has followed K-strategy for his contributions to rotiferology.
    Keywords: Rotifers ; taxonomy ; publications ; long life
    ISSN: 0018-8158
    E-ISSN: 1573-5117
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  • 7
    Language: English
    In: International Review of Hydrobiology, November 2011, Vol.96(5), pp.425-426
    ISSN: 1434-2944
    E-ISSN: 1522-2632
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  • 8
    In: ARHE, 06/17/2016, Vol.12(24), p.37
    Description: Autori polaze od jednostranosti koje su rezultat apsolutizovanja analitičkog načina mišljenja u savremenoj filozofiji. Četiri teze prikazuju slabe tačke oficijelne Analitičke filozofije (apsolutizovanje onog logičkog, ignorisanje drugih medija, jednodimenzionalnost favorizovanog običnog jezika, „omekšavanje“ strogih zahteva za važenjem). U nameri da prevaziđu te nedostatke, ujedno ne ispuštajući iz vida trajne tekovine analitičkog mišljenja (ideal jasnoće, jedinstven metod, samokritika putem kritike jezika), autori se na kraju članka zalažu za integrativno shvatanje jezika koje pored onih analitički obuhvaćenih aspekata jezika (logičko-semantički i pragmatički aspekat) u sebi obuhvata i nove aspekte fenomena jezika (efektivni, ekspresivni, kreativni aspekat jezika).
    Keywords: Philosophy;
    ISSN: 1820-0958
    E-ISSN: 1821-4940
    Source: CrossRef
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  • 9
    Language: English
    In: Biological Invasions, 2011, Vol.13(8), pp.1843-1853
    Description: In fresh waters, non-native invertebrate species preferentially spread via navigation waterways, where they often dominate assemblages. Littoral habitats in navigation waterways are regularly exposed to ship-induced waves. We conducted experiments to test the effects of artificial wave exposure on the relative performance of wide-spread native and non-native species. We compared physiological and behavioural response variables (i.e. growth rate, glycogen content, feeding and swimming activity) of two amphipods (native Gammarus roeselii and non-native Dikerogammarus villosus ) and two gastropods (native Bithynia tentaculata and non-native Physella acuta ) subject to wave and control (i.e. no wave) treatment flumes across a 6-week period. Growth, and in part glycogen content (as a measure of energy storage), were significantly reduced after exposure to waves in native invertebrates, but not in non-native invertebrates. The reduction in growth may be associated with the disturbance effects of waves, such as the higher swimming activity of G. roeselii and lower food uptake of B. tentaculata . In comparison, the effective hiding behaviour observed for D. villosus and good swimming ability of P. acuta , were identified as important traits facilitating the successful colonisation of the harsh habitat conditions of littoral waterways. Our study demonstrates that artificial wave regimes may contribute significant selective pressure, thus explaining the observed dominance of non-native species in navigational waterways. The success of non-native species under the harsh hydraulic habitat conditions of these socio-economically driven ecosystems may consequently be traced directly to behavioural and/or physiological traits.
    Keywords: Inland navigation ; Hydrodynamic disturbance ; Pre-adaptation ; Dikerogammarus villosus ; Growth rate ; Glycogen content
    ISSN: 1387-3547
    E-ISSN: 1573-1464
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  • 10
    Language: English
    In: Hydrobiologia, 1993, Vol.255(1), pp.165-170
    Description: Derived from the Monod-model and regulating principles a regulation model of the rotifer development in chemostats was developed. The model was validated in continuous cultures of Brachionus angularis both in steady-states, when undisturbed, and in transient-states after perturbations by step changes of dilution rate or input substrate concentration. Simulations of the simple model monotonically approached steady-states, but cultures show overshoots and damped oscillations before reaching this state. After introducing time-lags into the model it depends on the size of the time lag if model rotifer densities reach stable steady-state values (at low time lags) or stable limit cycles with periodic oscillations (at high time lags). At even higher time lags chaotic conditions occur in the model with final extinction of the rotifers.
    Keywords: Brachionus angularis ; chemostats ; steady-state ; transient-state ; regulation-model ; computer-simulation
    ISSN: 0018-8158
    E-ISSN: 1573-5117
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