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Characterizing man-made and natural modifications of microbial diversity and activity in coastal ecosystems

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Abstract

The impacts of growing coastal pollution and habitat alteration accompanying human encroachment are of great concern at the microbial level, where much of the ocean's primary production and biogeochemical cycling takes place. Coastal ecosystems are also under the influence of natural perturbations such as major storms and flooding. Distinguishing the impacts of natural and human stressors is essential for understanding environmentally-induced change in microbial diversity and function. The objective of this paper is to discuss the applications and merits of recently developed molecular, ecophysiological and analytical indicators and their utility in examining anthropogenic and climatic impacts on the structure and function of coastal microbial communities. The nitrogen-limited Neuse River Estuary and Pamlico Sound, North Carolina are used as examples of ecosystems experiencing both anthropogenic (i.e., accelerating eutrophication) and climatic stress (increasing frequencies of tropical storms and hurricanes). Additional examples are derived from a coastal monitoring site (LEO) on the Atlantic coast of New Jersey and Galveston Bay, on the Gulf of Mexico. In order to assess structure, function, and trophic state of these and other coastal ecosystems, molecular (DNA and RNA-based) characterizations of the microbial taxa involved in carbon, nitrogen and other nutrient transformations can be combined with diagnostic pigment-based indicators of primary producer groups. Application of these methods can reveal process-level microbial community responses to environmental variability over a range of scales. Experimental approaches combined with strategic monitoring utilizing these methods will facilitate: (a) understanding organismal and community responses to environmental change, and (b) synthesizing these responses in the context of ecosystem models that integrate physical, chemical and biotic variability with environmental controls.

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Authors and Affiliations

  1. Institute of Marine Sciences, University of North Carolina at Chapel Hill, 3431 Arendell Street, Morehead City, NC, 28557, USA

    Hans W. Paerl, Julianne Dyble & Luke Twomey

  2. Department of Oceanography, Texas A & M University, College Station, TX, 77843-3146, USA

    James L. Pinckney

  3. Institute of Marine and Coastal Sciences, Rutgers University, New Brunswick, NJ, 08901-8521, USA

    Joshua Nelson & Lee Kerkhof

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  1. Hans W. Paerl
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  2. Julianne Dyble
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  3. Luke Twomey
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  5. Joshua Nelson
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Correspondence to Hans W. Paerl.

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Paerl, H.W., Dyble, J., Twomey, L. et al. Characterizing man-made and natural modifications of microbial diversity and activity in coastal ecosystems. Antonie Van Leeuwenhoek 81, 487–507 (2002). https://doi.org/10.1023/A:1020561422706

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