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  • Long-term population dynamics of a coral reef gastropod and responses to disturbance

    Author(s)
    Catterall, CP
    Poiner, IR
    O'Brien, CJ
    Griffith University Author(s)
    Catterall, Carla P.
    Year published
    2001
    Metadata
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    Abstract
    The age-specific density of the red-lipped stromb Strombus luhuanus (Mollusca: Gastropoda) was monitored over 13 years (1981-1993) at four locations on the intertidal reef flat at Heron Island, Great Barrier Reef. Densities were highly variable, but there were persistent, location-specific differences in population density, age structure and adult body size, the latter indicating that the populations were not extensively linked by adult movement. There was relatively high recruitment at most locations in 1984, 1989 and 1993, each occurring approximately 2 years after El NiᯯSouthern Oscillation events, although recruit density ...
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    The age-specific density of the red-lipped stromb Strombus luhuanus (Mollusca: Gastropoda) was monitored over 13 years (1981-1993) at four locations on the intertidal reef flat at Heron Island, Great Barrier Reef. Densities were highly variable, but there were persistent, location-specific differences in population density, age structure and adult body size, the latter indicating that the populations were not extensively linked by adult movement. There was relatively high recruitment at most locations in 1984, 1989 and 1993, each occurring approximately 2 years after El NiᯯSouthern Oscillation events, although recruit density during these years varied in both space and time. The studied strombs experienced three disturbance events: (i) experimental harvesting at two locations (1984-1985); (ii) siltation from a harbour dredging operation (1987-1988); and (iii) a severe cyclone (1992). Resilience to harvesting at a local scale (0.5-2 ha) was high: density had recovered within a year, due to immigration of adults and older juveniles. Strombus luhuanus responded much more strongly to broad-scale changes to its environment than to localized harvesting. After dredging, there was a progressive density decline coupled with low recruitment at two locations, and a later decline at a third location, followed by a recruitment-driven rebound after the cyclone. Generalized environmental effects of siltation and the cyclone were also reflected in substantial changes in algal cover. Long-term variations in environmental conditions probably cause high temporal variation over large spatial scales through effects on the survival of larvae or recruits. Localized short-term field monitoring of such species would give a misleading picture of key factors affecting population dynamics.
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    Journal Title
    Austral Ecology
    Volume
    26
    DOI
    https://doi.org/10.1046/j.1442-9993.2001.01138.x
    Copyright Statement
    © 2001 Blackwell Publishing. The definitive version is available at [www.blackwell-synergy.com.]
    Subject
    Environmental sciences
    Biological sciences
    History, heritage and archaeology
    Publication URI
    http://hdl.handle.net/10072/3690
    Collection
    • Journal articles

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