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Spatial structure of a multi-species guild: the dominant biofilm-grazing microgastropods of seagrass

  • R. S. K. Barnes
Primary Research Paper

Abstract

Although all-too-often ignored ecologically, gastropods < 5 mm in largest dimension may be dominant aquatic assemblage components. In Moreton Bay, Australia, for example, intertidal seagrass supports a guild of 24 such biofilm-grazing species at mean density one-third that of the whole macrobenthic seagrass assemblage. Detailed spatial patterns of the 14 guild members at one c. 1 ha locality were investigated via a 256-station lattice. Relative importance of the guild within the macrobenthic assemblage as a whole was spatially uniform but its abundance was significantly patchy at all spatial scales—a few stations supporting up to 170 times background levels of some species—and guild patchiness showed a relatively constant magnitude across those scales. Patches of individual species were independently distributed, showing no evidence of negative inter-specific interactions, the few significant spatial correlations between species being very weak and positive. Levels of syntopy (up to six species within a 0.0054 m2 area) did not differ from those expected under null models of independent assortment. Although diverse, overall guild abundance was low, appearing well below potential carrying capacity, and dominated by few species. Power–law relationships suggested temporal stability of these patterns. Possible causes of such guild structure are discussed.

Keywords

Competition Macrobenthos Marine Mollusc Patchiness 

Notes

Acknowledgements

I am most grateful to the Quandamooka Yoolooburrabee Aboriginal Corporation, the Quandamooka Aboriginal Land and Sea Management Agency, and the Queensland Parks and Wildlife Service for permission to conduct research within the native title area of the Quandamooka People and within a Habitat Protection Zone of the Moreton Bay Marine Park, under permit QS2014/CVL588. I also warmly thank Ian Tibbetts and all the staff of the Moreton Bay Research Station for their help and support, and Morvan Barnes and Brian McCabe for computational advice. The work was made possible by the MBRS Distinguished Researcher Award from the UQ Centre for Marine Science, for which I am very grateful.

Funding

The project received no external funding.

Compliance with ethical standards

Conflict of interest

The author declares no conflicts of interest.

Ethical approval

All applicable international, national and/or institutional guidelines for the care and use of animals were followed, and all necessary permits were obtained.

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Authors and Affiliations

  1. 1.School of Biological Sciences and Centre for Marine ScienceUniversity of QueenslandBrisbaneAustralia
  2. 2.Biodiversity ProgramQueensland MuseumBrisbaneAustralia

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