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  • 2005-2009  (5)
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  • 1
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    How to survive as a pioneer species in the Antarctic benthos: Minimum dispersal distance as a function of lifetime and disturbance (2006)
    In:  EPIC3Polar biology, 29, pp. 543-551
    Details
    Publication Date: 2019-07-17
    Description: Very few details exists concerning the dispersal traits of Antarctic species and dispersal distances in particular are mostly unknown. Especially the general low number of mesoplanktonic larvae has caught attention and led to the formulation of Thorsons rule. From this concept, originally concerning only trophic aspects, sometimes a reduced dispersal distance is deduced. Using a generic simulation model we show that in a benthic habitat exposed to iceberg scouring even short dispersal phases of few hours are sufficient for a pioneer species to persist. This is very surprising for a pioneer species which should be able to disperse widely and colonise distant disturbed areas which are free of superior competitors. Our model revealed that the reason for this is the non-linear dependence of the dispersal distance on the disturbance regime and on species longevity. Thus, it is the combined effect of life history and disturbance traits which is important here: a sufficiently high disturbance frequency due to iceberg scouring and a long individual lifetime due to the low temperature decrease minimum dispersal distances required for persistence and thus coexistence and present an additional explanation for the relative rarity of planktonic larvae.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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  • 2
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    Modelling biodiversity dynamics (2005)
    In:  EPIC3Poster, International Workshop: "Development and control of functional biodiversity at micro- and macro-scales", 5-7 Oct., GSF, Neuherberg/Munich, Germany.
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 3
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    Modelling Biodiversity Dynamics (2005)
    In:  EPIC3Development and control of functional biodiversity at micro- and macro-scales October 5th to 7th 2005 GSF Research Center for Environment and Health Neuherberg/Munich.
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 4
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    Diversity and disturbances in the Antarctic megabenthos: Feasible versus theoretical disturbance ranges (2006)
    In:  EPIC3Ecosystems, 9, pp. 1-13
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 5
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    Clumped Dispersal and Species Coexistence (2005)
    In:  EPIC3Ecological Modelling
    Details
    Publication Date: 2019-07-17
    Description: AbstractClumped dispersal of species is a widespread phenomenon in nature, however its relevance for structuring communities and maintaining biodiversity is not well understood. We used a spatially explicit simulation model to assess the effects of clumped compared to non-clumped dispersal on the diversity of a model community of sessile species. The species differed only in terms of their mean dispersal distance. Neither trade-offs between dispersal and local competitive strengths nor differences in these competitive strengths were assumed. We investigated spatially homogeneous, heterogeneous and temporally fluctuating environments. In all cases clumped dispersal allowed the long-term coexistence of a variety of species in contrast to non-clumped dispersal. In particular, clumped dispersal was found to decouple the mechanism of spatial clustering and thus recruitment variation or limitation from the dispersal distance. This supports species coexistence even in environments where local non-clumped dispersal was a superior or inferior dispersal strategy. Clumping is an attribute of dispersal offering new possibilities for trade-offs with life-history traits and with the dispersal distance itself.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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