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  • 1
    Online Resource
    Online Resource
    Freshwater salinisation: a research agenda for a saltier world
    Elsevier BV ; 2022
    In:  Trends in Ecology & Evolution Vol. 37, No. 5 ( 2022-05), p. 440-453
    Details
    In: Trends in Ecology & Evolution, Elsevier BV, Vol. 37, No. 5 ( 2022-05), p. 440-453
    Type of Medium: Online Resource
    ISSN: 0169-5347
    URL: Article
    DOI: 10.1016/j.tree.2021.12.005
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2022
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  • 2
    Online Resource
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    Phytoplankton community responses to temperature fluctuations under different nutrient concentrations and stoichiometry
    Wiley ; 2019
    In:  Ecology Vol. 100, No. 11 ( 2019-11)
    Details
    In: Ecology, Wiley, Vol. 100, No. 11 ( 2019-11)
    Abstract: Nutrient availability and temperature are important drivers of phytoplankton growth and stoichiometry. However, the interactive effects of nutrients and temperature on phytoplankton have been analyzed mostly by addressing changes in average temperature, whereas recent evidence suggests an important role of temperature fluctuations. In a laboratory experiment, we grew a natural phytoplankton community under fluctuating and constant temperature regimes across 25 combinations of nitrogen (N) and phosphorus (P) supply. Temperature fluctuations decreased phytoplankton growth rate ( r max ), as predicted by nonlinear averaging along the temperature–growth relationship. r max increased with increasing P supply, and a significant temperature × P × N interaction reflected that the shape of the thermal reaction norm depended on nutrients. By contrast, phytoplankton carrying capacity increased with N supply and in fluctuating rather than constant temperature. Higher phytoplankton N:P ratios under constant temperature showed that temperature regimes affected cellular nutrient incorporation. Minor differences in species diversity and composition existed. Our results suggest that temperature variability interacts with nutrient supply to affect phytoplankton physiology and stoichiometry at the community level.
    Type of Medium: Online Resource
    ISSN: 0012-9658 , 1939-9170
    URL: Issue
    URL: Article
    DOI: 10.1002/ecy.v100.11
    DOI: 10.1002/ecy.2834
    RVK:
    WA 15000
    Language: English
    Publisher: Wiley
    Publication Date: 2019
    detail.hit.zdb_id: 1797-8
    detail.hit.zdb_id: 2010140-5
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  • 3
    Online Resource
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    Functionally reversible impacts of disturbances on lake food webs linked to spatial and seasonal dependencies
    Wiley ; 2021
    In:  Ecology Vol. 102, No. 4 ( 2021-04)
    Details
    In: Ecology, Wiley, Vol. 102, No. 4 ( 2021-04)
    Abstract: Increasing human impact on the environment is causing drastic changes in disturbance regimes and how they prevail over time. Of increasing relevance is to further our understanding on biological responses to pulse disturbances (short duration) and how they interact with other ongoing press disturbances (constantly present). Because the temporal and spatial contexts of single experiments often limit our ability to generalize results across space and time, we conducted a modularized mesocosm experiment replicated in space (five lakes along a latitudinal gradient in Scandinavia) and time (two seasons, spring and summer) to generate general predictions on how the functioning and composition of multitrophic plankton communities (zoo‐, phyto‐ and bacterioplankton) respond to pulse disturbances acting either in isolation or combined with press disturbances. As pulse disturbance, we used short‐term changes in fish presence, and as press disturbance, we addressed the ongoing reduction in light availability caused by increased cloudiness and lake browning in many boreal and subarctic lakes. First, our results show that the top‐down pulse disturbance had the strongest effects on both functioning and composition of the three trophic levels across sites and seasons, with signs for interactive impacts with the bottom‐up press disturbance on phytoplankton communities. Second, community composition responses to disturbances were highly divergent between lakes and seasons: temporal accumulated community turnover of the same trophic level either increased (destabilization) or decreased (stabilization) in response to the disturbances compared to control conditions. Third, we found functional recovery from the pulse disturbances to be frequent at the end of most experiments. In a broader context, these results demonstrate that top‐down, pulse disturbances, either alone or with additional constant stress upon primary producers caused by bottom‐up disturbances, can induce profound but often functionally reversible changes across multiple trophic levels, which are strongly linked to spatial and temporal context dependencies. Furthermore, the identified dichotomy of disturbance effects on the turnover in community composition demonstrates the potential of disturbances to either stabilize or destabilize biodiversity patterns over time across a wide range of environmental conditions.
    Type of Medium: Online Resource
    ISSN: 0012-9658 , 1939-9170
    URL: Issue
    URL: Article
    DOI: 10.1002/ecy.v102.4
    DOI: 10.1002/ecy.3283
    RVK:
    WA 15000
    Language: English
    Publisher: Wiley
    Publication Date: 2021
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  • 4
    Online Resource
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    Data_Sheet_3.zip
    Frontiers Media SA ; 2022
    In:  Frontiers in Marine Science Vol. 8 ( 2022-1-31)
    Details
    In: Frontiers in Marine Science, Frontiers Media SA, Vol. 8 ( 2022-1-31)
    Abstract: With increasing frequency and intensity of climate change events, it is crucial to understand how different components of temperature fluctuations affect the thermal tolerance and performance of marine primary producers. We used a controlled indoor-mesocosm set-up to test the effect of a temperature fluctuation frequency gradient on a natural phytoplankton community. Within a frequency gradient, we allowed the temperature to fluctuate from 18 ± 3°C at different rates (6, 12, 24, 36, and 48 h). The temperature fluctuation frequency gradient was contrasted to a constant temperature treatment with the same mean temperature (18°C). Phytoplankton biomass tended to increase with faster fluctuations but was lowest in the diurnal frequency treatment (24 h). In comparison with constant conditions, diurnal or slower fluctuation frequencies showed lower or comparable performance, whereas faster fluctuations showed higher performance. In addition, minor differences in community structure were observed, but species diversity remained comparable over time. Similarly, resource use efficiency and stoichiometry did not change according to fluctuation frequency treatments. We conclude that the effect of temperature fluctuations on phytoplankton biomass depends on the fluctuation frequency; this suggests that the fluctuation frequency determines how organisms average their environments. However, this trend is not driven by species identity but physiological responses. Our results also indicate that phytoplankton communities may be already well adapted to fluctuating environments and can adjust physiologically to temperature variability.
    Type of Medium: Online Resource
    ISSN: 2296-7745
    URL: Article
    URL: Article
    URL: Article
    URL: Article
    DOI: 10.3389/fmars.2021.812902
    DOI: 10.3389/fmars.2021.812902.s001
    DOI: 10.3389/fmars.2021.812902.s002
    DOI: 10.3389/fmars.2021.812902.s003
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2022
    detail.hit.zdb_id: 2757748-X
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  • 5
    Online Resource
    Online Resource
    DataSheet_2.docx
    Frontiers Media SA ; 2022
    In:  Frontiers in Marine Science Vol. 9 ( 2022-7-28)
    Details
    In: Frontiers in Marine Science, Frontiers Media SA, Vol. 9 ( 2022-7-28)
    Abstract: Rare earth elements (REEs) are used as powerful proxies for a variety of oceanic processes. The understanding of their biogeochemical behaviour in the marine environment is therefore essential. While the influence of OM-cycling on REE patterns in seawater is considered as insignificant, it has been shown that algae and bacteria provide good sorption surfaces for REEs and that components of the dissolved OM pool are able to complex REEs, thus potentially altering their behaviour. To investigate the impact of bio-associated processes on REEs in the bio-productive marine environment, we conducted an indoor mesocosm experiment that mimicked a phytoplankton spring bloom in the neritic coastal North Sea. The incubation period of 38 days covered two distinct phytoplankton bloom phases (diatoms followed by Phaeocystis sp.) and an interjacent bacterioplankton maximum. All dissolved REEs (dREEs) except samarium showed similar temporal concentration patterns, which were closely connected to the bloom succession. The concentration patterns were shaped by the ‘phytoplankton-shuttle’, which summarizes adsorption processes on phytoplankton-derived particulate OM (POM) and resulted in decreasing dREE concentrations alongside chlorophyll- a and POM maxima. The ‘heterotrophic-shuttle’ resulted in increasing dREE concentrations likely linked to heterotrophically mediated regeneration of POM and associated desorption processes. The effect of these processes on dREEs resulted in enhanced fractionation of light REEs (LREEs) relative to heavy REEs (HREEs) during adsorption processes and decreased fractionation as a result of desorption. At times of high dissolved organic carbon (DOC) concentrations, we observed a stabilization of especially dHREEs likely in organic complexes. To test the potential influence of DOC on dREEs, we used a PHREEQC model approach that revealed dREE complexation with components of the DOC pool and an increase in complexation with atomic mass of the REEs. That is, at high DOC concentrations OM-dREE complexation leads to an effective and preferential buffering of dHREE against adsorption. Our findings reveal that OM-cycling influences concentration patterns of dREEs via ad- and desorption processes as well as organic complexation with parts of the OM pool, suggesting these processes can have a significant impact on dREE concentrations in the natural marine environment under high OM conditions.
    Type of Medium: Online Resource
    ISSN: 2296-7745
    URL: Article
    URL: Article
    URL: Article
    DOI: 10.3389/fmars.2022.895723
    DOI: 10.3389/fmars.2022.895723.s001
    DOI: 10.3389/fmars.2022.895723.s002
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2022
    detail.hit.zdb_id: 2757748-X
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  • 6
    Online Resource
    Online Resource
    Combining dialysis and dilution techniques to estimate gross growth rate of phytoplankton and grazing by micro- and mesozooplankton in situ
    Schweizerbart ; 2006
    In:  Archiv für Hydrobiologie Vol. 167, No. 1-4 ( 2006-10-05), p. 403-419
    Details
    In: Archiv für Hydrobiologie, Schweizerbart, Vol. 167, No. 1-4 ( 2006-10-05), p. 403-419
    Type of Medium: Online Resource
    ISSN: 0003-9136
    Uniform Title: Combining dialysis and dilution techniques to estimate gross growth rate of phytoplankton and grazing by micro- and mesozooplankton in situ
    URL: Article
    DOI: 10.1127/0003-9136/2006/0167-0403
    RVK:
    WA 15000
    Language: English , English
    Publisher: Schweizerbart
    Publication Date: 2006
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    detail.hit.zdb_id: 2274501-4
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  • 7
    Online Resource
    Online Resource
    Data_Sheet_1.docx
    Frontiers Media SA ; 2020
    In:  Frontiers in Environmental Science Vol. 8 ( 2020-12-16)
    Details
    In: Frontiers in Environmental Science, Frontiers Media SA, Vol. 8 ( 2020-12-16)
    Abstract: In a changing world, phytoplankton communities face a large variety of challenges including altered light regimes. These alterations are caused by more pronounced stratification due to rising temperatures, enhanced eutrophication, and browning of lakes. Community responses toward these effects can emerge as alterations in physiology, biomass, biochemical composition, or diversity. In this study, we addressed the combined effects of changes in light and nutrient conditions on community responses. In particular, we investigated how light intensity and variability under two nutrient conditions influence (1) fast responses such as adjustments in photosynthesis, (2) intermediate responses such as pigment adaptation and (3) slow responses such as changes in community biomass and species composition. Therefore, we exposed communities consisting of five phytoplankton species belonging to different taxonomic groups to two constant and two variable light intensity treatments combined with two levels of phosphorus supply. The tested phytoplankton communities exhibited increased fast reactions of photosynthetic processes to light variability and light intensity. The adjustment of their light harvesting mechanisms via community pigment composition was not affected by light intensity, variability, or nutrient supply. However, pigment specific effects of light intensity, light variability, and nutrient supply on the proportion of the respective pigments were detected. Biomass was positively affected by higher light intensity and nutrient concentrations while the direction of the effect of variability was modulated by light intensity. Light variability had a negative impact on biomass at low, but a positive impact at high light intensity. The effects on community composition were species specific. Generally, the proportion of green algae was higher under high light intensity, whereas the cyanobacterium performed better under low light conditions. In addition to that, the diatom and the cryptophyte performed better with high nutrient supply while the green algae as well as the cyanobacterium performed better at low nutrient conditions. This shows that light intensity, light variability, and nutrient supply interactively affect communities. Furthermore, the responses are highly species and pigment specific, thus to clarify the effects of climate change a deeper understanding of the effects of light variability and species interactions within communities is important.
    Type of Medium: Online Resource
    ISSN: 2296-665X
    URL: Article
    URL: Article
    DOI: 10.3389/fenvs.2020.539733
    DOI: 10.3389/fenvs.2020.539733.s001
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2020
    detail.hit.zdb_id: 2741535-1
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  • 8
    Online Resource
    Online Resource
    Integrating elements and energy through the metabolic dependencies of gross growth efficiency and the threshold elemental ratio
    Wiley ; 2010
    In:  Oikos Vol. 119, No. 5 ( 2010-05), p. 752-765
    Details
    In: Oikos, Wiley, Vol. 119, No. 5 ( 2010-05), p. 752-765
    Type of Medium: Online Resource
    ISSN: 0030-1299
    URL: Article
    DOI: 10.1111/j.1600-0706.2009.18540.x
    Language: English
    Publisher: Wiley
    Publication Date: 2010
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    detail.hit.zdb_id: 207359-6
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  • 9
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    Environmental stoichiometry mediates phytoplankton diversity effects on communities' resource use efficiency and biomass
    Wiley ; 2022
    In:  Journal of Ecology Vol. 110, No. 2 ( 2022-02), p. 430-442
    Details
    In: Journal of Ecology, Wiley, Vol. 110, No. 2 ( 2022-02), p. 430-442
    Abstract: La relación positiva entre biodiversidad y las funciones ecosistémicas (ej. producción de biomasa) es fortalecida en presencia de una elevada variabilidad ambiental, ya que ésta promueve la complementariedad en el uso de los recursos en comunidades diversas. Dicha variabilidad ambiental puede representarse como variación en la relación de nutrientes (estequiometría), pero la eficiencia en el uso de los recursos (RUE por su sigla en inglés), y por lo tanto la biomasa, pueden verse limitados cuando la relación entre nutrientes es desbalanceada (es decir, existe un nutriente limitante y la relación entre nutrientes se encuentra fuera del óptimo para el crecimiento). El vínculo entre funciones ecosistémicas, diversidad y disponibilidad de nutrientes son entendidas a nivel teórico, pero cómo el uso de recursos y la biomasa son afectados por la diversidad en comunidades fitoplanctónicas con diferente disponibilidad de nutrientes (relación N:P) carece de evidencia experimental. Combinando un experimento de mesocosmos y microcosmos testeamos los efectos de la diversidad en el funcionamiento ecosistémico mediante la generación de un gradiente de especies raras, y lo expusimos a diferentes relaciones de N:P (con similar vs variable relación N:P). Dicho gradiente estequiométrico nos permitió, a su vez, evaluar las respuestas a relaciones de nutrientes balanceadas y desbalanceadas. Encontramos que una mayor diversidad de especies condujo a un aumento de la RUE y biomasa cuando la comunidad fue expuesta a un gradiente estequiométrico. Sin embargo, no se encontró un efecto de la diversidad cuando las relaciones N:P fueron similares. Contrario a las predicciones teóricas, la RUE fue elevada en condiciones estequiométricas desbalanceadas (elevada relación N:P y por lo tanto limitación por fósforo), sugiriendo que dichas condiciones no siempre implican una reducción en función. Síntesis . En general, nuestros resultados sugieren que el efecto de la pérdida de especies raras en el uso de recursos y biomasa fitoplanctónica puede ser compensado por las especies abundantes cuando la relación de nutrientes es similar, pero produce una disminución del funcionamiento ecositémico cuando la relación de nutrientes es variable. Este trabajo supone un primer intento de comprobar las interacciones entre la disponibilidad de múltiples nutrientes y la diversidad de las comunidades (naturales) de forma experimental.
    Type of Medium: Online Resource
    ISSN: 0022-0477 , 1365-2745
    URL: Issue
    URL: Article
    DOI: 10.1111/jec.v110.2
    DOI: 10.1111/1365-2745.13811
    Language: English
    Publisher: Wiley
    Publication Date: 2022
    detail.hit.zdb_id: 3023-5
    detail.hit.zdb_id: 2004136-6
    SSG: 12
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  • 10
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    Biodiversity promotes ecosystem functioning despite environmental change
    Wiley ; 2022
    In:  Ecology Letters Vol. 25, No. 2 ( 2022-02), p. 555-569
    Details
    In: Ecology Letters, Wiley, Vol. 25, No. 2 ( 2022-02), p. 555-569
    Abstract: Three decades of research have demonstrated that biodiversity can promote the functioning of ecosystems. Yet, it is unclear whether the positive effects of biodiversity on ecosystem functioning will persist under various types of global environmental change drivers. We conducted a meta‐analysis of 46 factorial experiments manipulating both species richness and the environment to test how global change drivers (i.e. warming, drought, nutrient addition or CO 2 enrichment) modulated the effect of biodiversity on multiple ecosystem functions across three taxonomic groups (microbes, phytoplankton and plants). We found that biodiversity increased ecosystem functioning in both ambient and manipulated environments, but often not to the same degree. In particular, biodiversity effects on ecosystem functioning were larger in stressful environments induced by global change drivers, indicating that high‐diversity communities were more resistant to environmental change. Using a subset of studies, we also found that the positive effects of biodiversity were mainly driven by interspecific complementarity and that these effects increased over time in both ambient and manipulated environments. Our findings support biodiversity conservation as a key strategy for sustainable ecosystem management in the face of global environmental change.
    Type of Medium: Online Resource
    ISSN: 1461-023X , 1461-0248
    URL: Issue
    URL: Article
    DOI: 10.1111/ele.v25.2
    DOI: 10.1111/ele.13936
    Language: English
    Publisher: Wiley
    Publication Date: 2022
    detail.hit.zdb_id: 2020195-3
    SSG: 12
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