Fronts, jumps and secondary introductions suggested as different invasion patterns in marine species, with an increase in spread rates over time

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    • Frederic Mineur
    • Andrew Davies
    • Christine Maggs
    • M. Verlaque
    • Mark Johnson

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    Not all introduced (invasive) species in a region will spread from a single point of introduction. Long-distance dispersal or further introductions can obscure the pattern of spread, but the regional importance of such processes is difficult to gauge. These difficulties are further compounded when information on the multiple scale process of invasive species range expansion is reduced to one-dimensional estimates of spread (e. g. km yr(-1)). We therefore compared the results of two different metrics of range expansion: maximum linear rate of spread and accumulation of occupied grid squares (50 x 50 km) over time. An analysis of records for 54 species of introduced marine macrophytes in the Mediterranean and northeast Atlantic revealed cases where the invasion process was probably missed (e. g. Atlantic Bonnemaisonia hamifera) and suggested cases of secondary introductions or erratic jump dispersal (Dasysiphonia sp. and Womersleyella setacea). A majority of species analysed showed evidence for an accumulation of invaded sites without a clear invasion front. Estimates of spread rate are increasing for more recent introductions. The increase is greater than can be accounted for by temporally varying search effort and implies a historical increase in vector efficiency and/or a decreased resistance of native communities to invasion.

    DOI

    Original languageEnglish
    Number of pages9
    Pages (from-to)2693-2701
    JournalPROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
    Journal publication date07 Sep 2010
    Issue number1694
    Volume277
    Early online date21 Apr 2010
    DOIs
    Publication statusPublished - 07 Sep 2010

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