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  • Institute of Physics  (439,433)
  • Springer Nature  (350,508)
  • 2015-2019  (530,501)
  • 2010-2014  (259,440)
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  • 1
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    Correction to: Resistance of Arctic phytoplankton to ocean acidification and enhanced irradiance (2018)
    Springer Nature
    In:  EPIC3Polar Biology, Springer Nature, 41(3), pp. 415-416, ISSN: 0722-4060
    Details
    Publication Date: 2024-05-08
    Description: The authors regret an error in the published article, where incorrect data was used to produce Figure 2, showing the temporal development of pH over the duration of the experiment. The corrected Fig. 2 shows that the error did not affect the interpretation of nor the conclusions drawn from the present dataset. The original article has been corrected.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , notRev
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  • 2
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    SILVA–Referenzdatensätze für den Nachweis von Mikroorganismen (2018)
    Springer Nature
    In:  EPIC3BIOspektrum, Springer Nature, 24(7), pp. 750-751, ISSN: 0947-0867
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    Publication Date: 2024-05-03
    Repository Name: EPIC Alfred Wegener Institut
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  • 3
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    Ein neuer Baum des Lebens? (2019)
    Springer Nature
    In:  EPIC3BIOspektrum, Springer Nature, 25(1), pp. 50-57, ISSN: 0947-0867
    Details
    Publication Date: 2024-05-03
    Repository Name: EPIC Alfred Wegener Institut
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  • 4
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    Correction to: Sedimentary and geochemical characteristics of two small permafrost-dominated Arctic river deltas in northern Alaska (2018)
    Springer Nature
    In:  EPIC3arktos, Springer Nature, 4(1), pp. 1-1, ISSN: 2364-9453
    Details
    Publication Date: 2024-04-11
    Description: Arctic river deltas are highly dynamic environments in the northern circumpolar permafrost region that are affected by fluvial, coastal, and permafrost-thaw processes. They are characterized by thick sediment deposits containing large but poorly constrained amounts of frozen organic carbon and nitrogen. This study presents new data on soil organic carbon and nitrogen storage as well as accumulation rates from the Ikpikpuk and Fish Creek river deltas, two small, permafrost-dominated Arctic river deltas on the Arctic Coastal Plain of northern Alaska. A soil organic carbon storage of 42.4 ± 1.6 and 37.9 ± 3.5 kg C m− 2 and soil nitrogen storage of 2.1 ± 0.1 and 2.0 ± 0.2 kg N m− 2 was found for the first 2 m of soil for the Ikpikpuk and Fish Creek river delta, respectively. While the upper meter of soil contains 3.57 Tg C, substantial amounts of carbon (3.09 Tg C or 46%) are also stored within the second meter of soil (100–200 cm) in the two deltas. An increasing and inhomogeneous distribution of C with depth is indicative of the dominance of deltaic depositional rather than soil forming processes for soil organic carbon storage. Largely, mid- to late Holocene radiocarbon dates in our cores suggest different carbon accumulation rates for the two deltas for the last 2000 years. Rates up to 28 g C m− 2 year− 1 for the Ikpikpuk river delta are about twice as high as for the Fish Creek river delta. With this study, we highlight the importance of including these highly dynamic permafrost environments in future permafrost carbon estimations.
    Repository Name: EPIC Alfred Wegener Institut
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  • 5
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    Genomic and enzymatic evidence for acetogenesis among multiple lineages of the archaeal phylum Bathyarchaeota widespread in marine sediments (2016)
    Springer Nature
    Details
    Publication Date: 2023-12-13
    Description: Members of the archaeal phylum Bathyarchaeota are widespread and abundant in the energy-deficient marine subsurface sediments. However, their life strategies have remained largely elusive. Here, we provide genetic evidence that some lineages of Bathyarchaeota are acetogens, being capable of homoacetogenesis, a metabolism so far restricted to the domain Bacteria. Metabolic reconstruction based on genomic bins assembled from the metagenome of deep-sea subsurface sediments shows that the metabolism of some lineages of Bathyarchaeota is similar to that of bona fide bacterial homoacetogens, by having pathways for acetogenesis and for the fermentative utilization of a variety of organic substrates. Heterologous expression and activity assay of the acetate kinase gene ack from Bathyarchaeota, demonstrate further the capability of these Bathyarchaeota to grow as acetogens. The presence and expression of bathyarchaeotal genes indicative of active acetogenesis was also confirmed in Peru Margin subsurface sediments where Bathyarchaeota are abundant. The analyses reveal that this ubiquitous and abundant subsurface archaeal group has adopted a versatile life strategy to make a living under energy-limiting conditions. These findings further expand the metabolic potential of Archaea and argue for a revision of the role of Archaea in the carbon cycle of marine sediments.
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  • 6
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    Far-ranging generalist top predators enhance the stability of meta-foodwebs (2019)
    Springer Nature
    In:  EPIC3Scientific Reports, Springer Nature, 9(1), pp. 12268-12268, ISSN: 2045-2322
    Details
    Publication Date: 2023-09-25
    Description: Identifying stabilizing factors in foodwebs is a long standing challenge with wide implications for community ecology and conservation. Here, we investigate the stability of spatially resolved meta-foodwebs with far-ranging super-predators for whom the whole meta-foodwebs appears to be a single habitat. By using a combination of generalized modeling with a master stability function approach, we are able to efficiently explore the asymptotic stability of large classes of realistic many-patch meta-foodwebs. We show that meta-foodwebs with far-ranging top predators are more stable than those with localized top predators. Moreover, adding far-ranging generalist top predators to a system can have a net stabilizing effect. These results highlight the importance of top predator conservation.
    Repository Name: EPIC Alfred Wegener Institut
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  • 7
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    Phytoplankton responses to temperature increases are constrained by abiotic conditions and community composition (2016)
    Springer Nature
    In:  EPIC3Oecologia, Springer Nature, 182(3), pp. 815-827, ISSN: 0029-8549
    Details
    Publication Date: 2023-09-22
    Description: Effects of temperature changes on phytoplankton communities seem to be highly context-specific, but few studies have analyzed whether this context specificity depends on differences in the abiotic conditions or in species composition between studies. We present an experiment that allows disentangling the contribution of abiotic and biotic differences in shaping the response to two aspects of temperature change: permanent increase of mean temperature versus pulse disturbance in form of a heat wave. We used natural communities from six different sites of a floodplain system as well as artificially mixed communities from laboratory cultures and grew both, artificial and natural communities, in water from the six different floodplain lakes (sites). All 12 contexts (2 communities × 6 sites) were first exposed to three different temperature levels (12, 18, 24 °C, respectively) and afterward to temperature pulses (4 °C increase for 7 h day(-1)). Temperature-dependent changes in biomass and community composition depended on the initial composition of phytoplankton communities. Abiotic conditions had a major effect on biomass of phytoplankton communities exposed to different temperature conditions, however, the effect of biotic and abiotic conditions together was even more pronounced. Additionally, phytoplankton community responses to pulse temperature effects depended on the warming history. By disentangling abiotic and biotic effects, our study shows that temperature-dependent effects on phytoplankton communities depend on both, biotic and abiotic constraints.
    Repository Name: EPIC Alfred Wegener Institut
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  • 8
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    Can monitoring data contribute to the biodiversity-ecosystem function debate? Evaluating data from a highly dynamic ecosystem (2014)
    Springer Nature
    In:  EPIC3Biodiversity and Conservation, Springer Nature, 23(2), pp. 405-419, ISSN: 0960-3115
    Details
    Publication Date: 2023-09-22
    Description: One of the most controversially discussed topics in current biodiversity-ecosystem function research is the transfer of results from experimental and theoretical studies to natural ecosystems. At the same time, monitoring data on biodiversity are requested as key indicators for the state of an ecosystem in most environmental evaluation frameworks. We analyse two monitoring data sets comprising information on abundance and biomass of macrozoobenthos communities in the German Wadden Sea in order to evaluate how much information monitoring data on biodiversity provide concerning ecosystem functioning and what implications this information (or the lack thereof) has for future monitoring programmes. Our results show a positive correlation between number of species of macrozoobenthos and its standing stock. Despite differences in overall biomass and individual size in different functional groups, this correlation remained consistent for different feeding guilds and therefore is likely to be independent of certain species traits. Moreover, functional turnover analyses indicate that increasing species richness is needed to maintain biomass levels over increasing periods of time. Whereas our data thus corroborate predictions from theory, we could not determine any causal relationships, because monitoring data commonly include only vague proxies for very few functional parameters, in our case standing biomass as a proxy for production. As to the use of diversity as an indicator for ecosystem functioning, we advise that management decisions are to be based on verified causal relationships and therefore strongly suggest the general incorporation of unambiguous proxies for functional parameters in the measuring campaigns of monitoring programmes.
    Repository Name: EPIC Alfred Wegener Institut
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  • 9
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    The body-size structure of macrobenthos changes predictably along gradients of hydrodynamic stress and organic enrichment (2015)
    Springer Nature
    In:  EPIC3Marine Biology, Springer Nature, 162(3), pp. 675-685, ISSN: 0025-3162
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    Publication Date: 2023-09-22
    Repository Name: EPIC Alfred Wegener Institut
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  • 10
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    Adaptation of phytoplankton to a decade of experimental warming linked to increased photosynthesis (2017)
    Springer Nature
    Details
    Publication Date: 2023-07-11
    Description: Phytoplankton photosynthesis is a critical flux in the carbon cycle, accounting for approximately 40% of the carbon dioxide fixed globally on an annual basis and fuelling the productivity of aquatic food webs. However, rapid evolutionary responses of phytoplankton to warming remain largely unexplored, particularly outside the laboratory, where multiple selection pressures can modify adaptation to environmental change. Here, we use a decade-long experiment in outdoor mesocosms to investigate mechanisms of adaptation to warming (+4 °C above ambient temperature) in the green alga Chlamydomonas reinhardtii, in naturally assembled communities. Isolates from warmed mesocosms had higher optimal growth temperatures than their counterparts from ambient treatments. Consequently, warm-adapted isolates were stronger competitors at elevated temperature and experienced a decline in competitive fitness in ambient conditions, indicating adaptation to local thermal regimes. Higher competitive fitness in the warmed isolates was linked to greater photosynthetic capacity and reduced susceptibility to photoinhibition. These findings suggest that adaptive responses to warming in phytoplankton could help to mitigate projected declines in aquatic net primary production by increasing rates of cellular net photosynthesis.
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