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  • Federal Agency for Nature Conservation  (3)
  • Taylor & Francis  (2)
  • 1
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    Patterns of diversity along experimental gradients of disturbance and nutrient supply - the confounding assumptions of the Intermediate Disturbance Hypothesis (2010)
    Taylor & Francis
    In:  African Journal of Marine Science, 32 (1). pp. 127-135.
    Details
    Publication Date: 2019-01-21
    Description: A model of the interactive effects of disturbance and productivity on diversity predicts peak diversity to shift towards higher disturbance regimes as productivity increases, confining the Intermediate Disturbance Hypothesis to intermediate productivity levels. We conducted a two-factorial (disturbance, nutrients) field experiment to test the validity of this model for two subtropical intertidal rocky shores. Treatment responses varied between distinct community types at two sites. Intensified disturbance increased evenness, and under high nutrient enrichment decreased species richness of communities dominated by encrusting algae, whereas turf-dominated communities remained unaffected. Nutrient additions increased biomass and modulated community composition at both sites, in addition to increasing species richness in encrusting-algal and decreasing evenness of turf-forming assemblages. Thus, only highly enriched encrusting-algal communities followed the model predictions. Different mechanisms appear to control species coexistence in different types of communities, some violating the assumptions of the tested model, i.e. resource limitation and competitive exclusion.
    Type: Article , PeerReviewed
    Format: text
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  • 2
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    Species profiles invertebrates ("Icelandic cyprine", "Dog whelk" and "(Euroean) Flat oyster") (2012)
    Federal Agency for Nature Conservation
    In:  In: Threatened Biodiversity in the German North and Baltic Seas: Sensitivities towards Human Activities and the Effects of Climate Change. , ed. by Narberhaus, I., Krause, J. and Bernitt, U. Naturschutz und Biologische Vielfalt, 116 . Federal Agency for Nature Conservation, Bonn-Bad Godesberg, Germany, pp. 211-247. ISBN 978-3-7843-4017-3
    Details
    Publication Date: 2019-09-23
    Type: Book chapter , NonPeerReviewed
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  • 3
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    Habitat / Biotope Profiles (2012)
    Federal Agency for Nature Conservation
    In:  In: Threatened Biodiversity in the German North and Baltic Seas: Sensitivities towards Human Activities and the Effects of Climate Change. , ed. by Narberhaus, I., Krause, J. and Bernitt, U. Naturschutz und Biologische Vielfalt, 116 . Federal Agency for Nature Conservation, Bonn-Bad Godesberg, Germany, pp. 41-210. ISBN 978-3-7843-4017-3
    Details
    Publication Date: 2012-11-27
    Type: Book chapter , NonPeerReviewed
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  • 4
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    Reading guide to the species and habitat profiles (2012)
    Federal Agency for Nature Conservation
    In:  In: Threatened Biodiversity in the German North and Baltic Seas: Sensitivities towards Human Activities and the Effects of Climate Change. , ed. by Narberhaus, I., Krause, J. and Bernitt, U. Naturschutz und Biologische Vielfalt, 116 . Federal Agency for Nature Conservation, Bonn, Germany, pp. 27-41. ISBN 978-3-7843-4017-3
    Details
    Publication Date: 2019-09-23
    Type: Book chapter , NonPeerReviewed
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  • 5
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    Decreased depth distribution of Fucus vesiculosus (Phaeophyceae) in the Western Baltic: effects of light deficiency and epibionts on growth and photosynthesis (2008)
    Taylor & Francis
    In:  European Journal of Phycology, 43 (2). pp. 143-150.
    Details
    Publication Date: 2017-01-04
    Description: For many coastal areas of the world, a decrease in abundance and depth penetration of perennial macroalgae and seagrasses has been documented and attributed to eutrophication. A surplus of nutrients impairs perennial seaweeds in at least two ways: increased phytoplankton densities reduce the depth penetration of light and in addition filamentous seaweeds and microalgae growing epiphytically shade their perennial hosts. A reduction of depth limit and total abundance has also been observed for the brown seaweed Fucus vesiculosus at many sites in the Baltic Sea. However, in most cases the mechanistic reason for the loss of Fucus has been deduced from observations rather than from experimental evidence. Here, we present results of a two-factorial (water depth/light supply and epibionts) experiment that was run in the Kiel Fjord, western Baltic, from August to October 2005. Performance of F. vesiculosus was recorded by growth and chlorophyll measurements, PI-curves and in situ measurements of the photosynthetic activity as the relative rate of electron transport (rETR). rETR and growth decreased with water depth. Chlorophyll a concentrations increased with reduced light intensities, but this apparently could not compensate for the light deficiency. Epibionts enhanced the negative effect of reduced light conditions on growth. According to these findings we estimated the physiological depth limit of F. vesiculosus in the Kiel Fjord to lie between 4 and 6 m water depth.
    Type: Article , PeerReviewed
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