Fine-scale effects of boat moorings on soft sediment communities masked in large-scale comparisons

Assunta C. Macolino, Katherine A. Dafforn*, Luke H. Hedge, Alistair G. B. Poore, Emma L. Johnston

*Corresponding author for this work

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    Abstract

    Population growth is driving the demand for recreational marine infrastructure, resulting in extensive coastal habitat modification. Boat moorings, for example, are popular for vessel storage and are known to damage seagrass communities, yet little is known about how they influence unvegetated sediment habitats. Here we investigate the effects of boat moorings on sediment infauna using metrics of community composition, diversity, total abundance and abundances of individual functional groups and dominant taxa. Metrics were compared at fine and larger spatial scales, to investigate how spatial variability affects the ecological assessments in soft-sedimentary environments. Fine-scale models revealed changes in community composition and mollusk abundance with the distance from moorings, while sediment grain size was also an important predictor for composition, bivalve and polychaete abundances, although the direction of effects varied. When the same metrics were compared at larger scales (i.e., boating infrastructure present or lacking) we found that spatial variability among locations was detected, but no effect for moorings. With increased urbanization and industrialization of coastal areas there is a clear need to account for the scale of potential ecological effects in investigations of coastal infrastructure developments.

    Original languageEnglish
    Article number101
    Pages (from-to)1-10
    Number of pages10
    JournalFrontiers in Marine Science
    Volume6
    DOIs
    Publication statusPublished - 12 Mar 2019

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    Bibliographical note

    Copyright the Author(s) 2019. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

    Keywords

    • Boating
    • Marine infrastructure
    • Monitoring
    • Moorings
    • Soft sediment communities
    • Spatial variability

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