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  • Blackwell Science Ltd  (1)
  • British Ecological Society  (1)
  • 2000-2004  (2)
  • 2004  (2)
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  • 2000-2004  (2)
Year
  • 2004  (2)
  • 1
    Electronic Resource
    Electronic Resource
    UV effects that come and go: a global comparison of marine benthic community level impacts (2004)
    Oxford, UK : Blackwell Science Ltd
    Global change biology 10 (2004), S. 0 
    Details
    ISSN: 1365-2486
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Geography
    Notes: Ambient UV radiation has substantially increased during the last decades, but its impact on marine benthic communities is hardly known. The aim of this study was to globally compare and quantify how shallow hard-bottom communities are affected by UV during early succession. Identical field experiments in 10 different coastal regions of both hemispheres produced a consistent but unexpected pattern: (i) UV radiation affected species diversity and community biomass in a very similar manner, (ii) diversity and biomass were reduced to a larger extent by UVA than UVB radiation, (iii) ambient UV levels did not affect the composition of the communities, and (iv) any UV effects disappeared during species succession after 2–3 months. Thus, current levels of UV radiation seem to have small, predictable, and transient effects on shallow marine hard-bottom communities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2486.2004.00872.x
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    Paper (German National Licenses)
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  • 2
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    Regulation of antiherbivore defence by Fucus vesiculosus in response to various cues. (2004)
    British Ecological Society
    In:  Journal of Ecology, 92 . pp. 1011-1018.
    Details
    Publication Date: 2019-02-06
    Description: 1 We examined whether the marine macroalga Fucus vesiculosus induces defences herbivory and, if so, which factors trigger this induction. In addition, we assessed whether induced defences are reduced after consumption stops. 2 Induced effects were measured as changes in palatability rather than changes in the chemistry of the algae. We also tested for reductions in growth rate to determine whether induced defence incurs metabolic costs. 3 We tested whether direct grazing, feeding on neighbouring plants, clipping and pre- sence of a non-grazing herbivore could trigger induction. The isopod Idotea baltica and the gastropod Littorina littorea were used as herbivores. 4 Both direct feeding of I. baltica and feeding on neighbouring plants induced chemical defence in E vesiculosus, whereas the snail L. Iittorea only induced defence by direct grazing. Simulated herbivory (clipping), or the presence of herbivores without grazing, did not lead to defence induction. All induced defences were reversed within 2 weeks of consumption ending. 5 Thus, F. vesiculosus differentiates between physical damage and natural herbivory. Furthermore, feeding by I. baltica on F. vesiculosus releases signals that trigger neigh- bouring Fucus individuals to induce defence. 6 We found no evidence that metabolic costs incurred as a consequence of induced defence were sufficient to lead to growth reduction. 7 This algal species demonstrates defence plasticity (i.e. induction and reduction of anti-herbivore defences 'on demand'), with the response depending on both grazer identity and grazing pattern matter.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1111/j.0022-0477.2004.00936.x
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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