Recovery of the biogenic nest habitat of Limaria hians (Mollusca: Limacea) following anthropogenic disturbance

Colin Trigg, Colin G. Moore

    Research output: Contribution to journalArticle

    4 Citations (Scopus)

    Abstract

    The rate of regrowth of Limaria hians nest material, following a simulated dredging impact, was examined on an extensive L. hians bed off the west coast of Scotland. Within an area of complete coverage of the sea bed by a turf of L. hians nest material, the turf was cleared by diver from 10 × 0.25 m2 plots and the sediment subsequently raked to simulate the passage of a scallop dredge. The areal extent and pattern of nest regrowth were recorded after 6 and 12 months. Control plots showed no significant change in 100% nest cover over the year. In the treated plots regrowth generally occurred from extension of peripheral nest material. Over the initial 6 autumn and winter months treatment plots displayed a mean regrowth of 9.2% of the cleared area, increasing to 15% in the second 6-month spring and summer period. However, no significant difference in growth was found between these periods. After 12 months half the treatment plots exhibited <25% nest cover and none of them contained nest of a thickness comparable to the surrounding bed. Conversion of regrowth rates within the treated plots to the rate of nest advance along a linear front, gave a value of 3.2 cm per year, highlighting the susceptibility of this species-rich biotope to scallop dredging. © 2009 Elsevier Ltd. All rights reserved.

    Original languageEnglish
    Pages (from-to)351-356
    Number of pages6
    JournalEstuarine, Coastal and Shelf Science
    Volume82
    Issue number2
    DOIs
    Publication statusPublished - 10 Apr 2009

    Keywords

    • dredge impact
    • man-induced effects
    • marine molluscs
    • reef formation
    • Scotland
    • species diversity

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