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  • 1
    Monograph available for loan
    Monograph available for loan
    Stuttgart [u.a.] : Thieme
    Call number: AWI G2-96-0470
    Description / Table of Contents: Die Organismen der Binnengewässer und deren Wechselwirkungen mit der Umwelt dienen hier als Modell zur Darlegung der Hauptprobleme in der wissenschaftlichen Ökologie von Gemeinschaften und Systemen: Wesentlichstes didaktisches Ziel ist die Verdeutlichung ökologischer Tatbestände als Teile einer experimentellen und theoretischen Wissenschaft auf der Grundlage einer mechanistischen und darwinistischen Auffassung. Strukturen und Vorgänge in den höheren hierarchischen Rängen (Gemeinschaften und Ökosysteme) werden als Ergebnis der Aktivitäten von Organismen verstanden - in einem Kompromiß zwischen dem Erwerb von Ressourcen und der Verminderung der Sterblichkeit.
    Type of Medium: Monograph available for loan
    Pages: 440 S.
    ISBN: 3137864011
    Series Statement: BIO - Flexibles Taschenbuch
    Branch Library: AWI Library
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  • 2
    Publication Date: 2019-02-01
    Description: Decreasing biodiversity is projected as one of the most consistent effects of warming on marine microbial communities. It is predicted that low biodiversity will consequently influence the community sensitivity to additional environmental alterations. Mesocosms were used to study the response of natural Mediterranean phytoplankton communities (control and heat shock + 6 °C) to salinity variations (− 5psu, control, + 5psu). We examined the effect on species composition, species richness as well as phytoplankton biomass and resource use efficiency. Heat shock was coupled with decreased species richness (30 species in control community while 26 in heat shock) and slightly reduced phytoplankton biomass. Changes in salinity altered the phytoplankton species composition (dinoflagellates were absent in decreased salinity treatments) and significantly reduced the phytoplankton species richness. The phytoplankton biomass and the resource use efficiency also decreased with exception of the increased salinity treatment in the non-heated community. In general, decreased salinity had stronger negative effects compared to increased salinity as displayed by the lowest species richness and lowest phytoplankton biomass in those treatments. Most notably, we identified a synergistic negative effect of heat shock with increased/decreased salinity which can be attributed to the lower species richness and, thus, decreased stability in the heated community.
    Type: Article , PeerReviewed
    Format: text
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  • 3
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    Akademia Kiado
    In:  Community Ecology, 19 (2). pp. 107-115.
    Publication Date: 2019-02-01
    Description: Food chains in the pelagic zones of oceans and lakes are longer than in terrestrial ecosystems. The perception of the pelagic food web has become increasingly complex by progressing from a linear food chain (phytoplankton – crustacean zooplankton – planktivorous fish – predatory fish) to a food web because of an increasing appreciation of microbial trophic pathways, side-tracks by gelatinous zooplankton and a high prevalence of omnivory. The range of predator:prey size ratios by far exceeds the traditionally assumed range of 10:1 to 100:1, from almost equal length to 105:1. The size ratios between primary consumers and top predators are 3½ orders of magnitude bigger in pelagic than in terrestrial food webs. Comparisons between different pelagic ecosystems support ecosystem size as an important factor regulating the maximal trophic level, while energy limitation of the number of trophic levels is less well supported. An almost 1:1 relationship between ingestion by predators and prey mortality and a better chemical match between primary producer and herbivore biomass are further distinctive features of the pelagic food web whose role in explaining the higher number of trophic levels in pelagic systems needs further examination.
    Type: Article , PeerReviewed
    Format: text
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  • 4
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 5815 data points
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  • 5
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 3962 data points
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  • 6
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 1653 data points
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  • 7
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    Unknown
    PANGAEA
    In:  Supplement to: Mittermayr, Agnes; Fox, Sophia E; Sommer, Ulrich (2014): Temporal variation in stable isotope composition (delta 13C, delta 15N and delta 34S) of a temperate Zostera marina food web. Marine Ecology Progress Series, 505, 95-105, https://doi.org/10.3354/meps10797
    Publication Date: 2019-01-26
    Description: Simultaneous triple stable isotope analysis of carbon, nitrogen and sulphur was employed to study the temporal variation in the food web of a subtidal eelgrass (Zostera marina) bed in the western Baltic Sea. Samples of three potential food sources: eelgrass, epiphytes and seston, as well as consumer species were collected biweekly from March through September 2011. Temporal variation of stable isotope signatures was observed in primary producers and consumer species. However, variation within a species, particularly omnivores, often exceeded variation over time. The high degree of omnivory among the generalist feeders in this eelgrass community allows for generalist feeders to flexibly switch food sources, thus enhancing food web stability. As coastal systems are subject to seasonal changes, as well as alterations related to human disturbance and climate, these food webs may retain a certain resilience due to their plentiful omnivores.
    Type: Dataset
    Format: text/tab-separated-values, 10420 data points
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  • 8
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    PANGAEA
    In:  Supplement to: Bi, Rong; Ismar, Stefanie M; Sommer, Ulrich; Zhao, Meixun (2018): Simultaneous shifts in elemental stoichiometry and fatty acids of Emiliania huxleyi in response to environmental changes. Biogeosciences, 15(4), 1029-1045, https://doi.org/10.5194/bg-15-1029-2018
    Publication Date: 2019-04-30
    Description: Climate-driven changes in environmental conditions have significant and complex effects on marine ecosystems. Variability in phytoplankton elements and biochemicals can be important for global ocean biogeochemistry and ecological functions, while there is currently limited understanding on how elements and biochemicals respond to the changing environments in key coccolithophore species such as Emiliania huxleyi. We investigated responses of elemental stoichiometry and fatty acids (FAs) in a strain of E. huxleyi under three temperatures (12, 18 and 24 oC), three N:P supply ratios (molar ratios 10:1, 24:1 and 63:1) and two pCO2 levels (560 and 2400 µatm). Overall, C:N:P stoichiometry showed the most pronounced response to N:P supply ratios, with high ratios of particulate organic carbon vs. particulate organic nitrogen (POC:PON) and low ratios of PON vs. particulate organic phosphorus (PON:POP) in low N-media, and high POC:POP and PON:POP in low P-media. The ratio of particulate inorganic carbon vs. POC (PIC:POC) and polyunsaturated fatty acid proportions strongly responded to temperature and pCO2, both being lower under high pCO2 and higher with warming. We observed synergistic interactions between warming and nutrient deficiency (and high pCO2) on elemental cellular contents and docosahexaenoic acid (DHA) proportion in most cases, indicating the enhanced effect of warming under nutrient deficiency (and high pCO2). Our results suggest differential sensitivity of elements and FAs to the changes in temperature, nutrient availability and pCO2 in E. huxleyi, which is to some extent unique compared to non-calcifying algal classes. Thus, simultaneous changes of elements and FAs should be considered when predicting future roles of E. huxleyi in the biotic-mediated connection between biogeochemical cycles, ecological functions and climate change.
    Type: Dataset
    Format: text/tab-separated-values, 1025 data points
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  • 9
    Publication Date: 2014-12-18
    Repository Name: EPIC Alfred Wegener Institut
    Type: PANGAEA Documentation , NonPeerReviewed
    Format: application/pdf
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  • 10
    Publication Date: 2016-12-01
    Description: The focus of this project was on the pivotal role of microzooplankton (MZP) as trophic intermediary between the microbial loop and higher trophic levels. At the base of the food web, MZP has a strong impact on phytoplankton standing stocks due to its high growth and grazing rates, leading to dietary competition with larger mesozooplankton. Simultaneously, higher trophic levels use MZP as food source and benefit from its ability to buffer nutritional imbalances especially at times when food quality of phytoplankton is low. Therefore, MZP abundance, biomass and taxonomic composition were investigated during three mesocosm experiments within the BIOACID II framework, using natural plankton communities. The KOSMOS 2013 Gullmar Fjord experiment in the North Sea was a long-term outdoor mesocosm study with an elevated CO2 level as single stressor. Contrastingly, the BIOACID Autumn 2012 and Summer 2013 Baltic Sea indoor mesocosm experiments investigated the combined effects of both high CO2 and warming. In conclusion, warming can be expected to directly affect MZP communities and enhance their growth and grazing pressure. Additionally, more complex responses of MZP to an increase in CO2 can be expected from the results. The present data points at predominately indirect effects on the MZP community via e.g. changes in phytoplankton community composition and/or standing stocks.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , NonPeerReviewed
    Format: application/pdf
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