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Sensitivity of Heterogeneous Marine Benthic Habitats to Subtle Stressors

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  • Iván F Rodil
  • Andrew M Lohrer
  • Simon F Thrush

Abstract

It is important to understand the consequences of low level disturbances on the functioning of ecological communities because of the pervasiveness and frequency of this type of environmental change. In this study we investigated the response of a heterogeneous, subtidal, soft-sediment habitat to small experimental additions of organic matter and calcium carbonate to examine the sensitivity of benthic ecosystem functioning to changes in sediment characteristics that relate to the environmental threats of coastal eutrophication and ocean acidification. Our results documented significant changes between key biogeochemical and sedimentary variables such as gross primary production, ammonium uptake and dissolved reactive phosphorus flux following treatment additions. Moreover, the application of treatments affected relationships between macrofauna communities, sediment characteristics (e.g., chlorophyll a content) and biogeochemical processes (oxygen and nutrient fluxes). In this experiment organic matter and calcium carbonate showed persistent opposing effects on sedimentary processes, and we demonstrated that highly heterogeneous sediment habitats can be surprisingly sensitive to subtle perturbations. Our results have important biological implications in a world with relentless anthropogenic inputs of atmospheric CO2 and nutrients in coastal waters.

Suggested Citation

  • Iván F Rodil & Andrew M Lohrer & Simon F Thrush, 2013. "Sensitivity of Heterogeneous Marine Benthic Habitats to Subtle Stressors," PLOS ONE, Public Library of Science, vol. 8(11), pages 1-10, November.
  • Handle: RePEc:plo:pone00:0081646
    DOI: 10.1371/journal.pone.0081646
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    References listed on IDEAS

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    1. Andrew M. Lohrer & Simon F. Thrush & Max M. Gibbs, 2004. "Bioturbators enhance ecosystem function through complex biogeochemical interactions," Nature, Nature, vol. 431(7012), pages 1092-1095, October.
    2. Camille Parmesan & Gary Yohe, 2003. "A globally coherent fingerprint of climate change impacts across natural systems," Nature, Nature, vol. 421(6918), pages 37-42, January.
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