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. 2016 Aug 29;6(18):6662-6671.
doi: 10.1002/ece3.2408. eCollection 2016 Sep.

Coastal connectivity and spatial subsidy from a microbial perspective

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Free PMC article

Coastal connectivity and spatial subsidy from a microbial perspective

Christin Säwström et al. Ecol Evol. .
Free PMC article

Abstract

The transfer of organic material from one coastal environment to another can increase production in recipient habitats in a process known as spatial subsidy. Microorganisms drive the generation, transformation, and uptake of organic material in shallow coastal environments, but their significance in connecting coastal habitats through spatial subsidies has received limited attention. We address this by presenting a conceptual model of coastal connectivity that focuses on the flow of microbially mediated organic material in key coastal habitats. Our model suggests that it is not the difference in generation rates of organic material between coastal habitats but the amount of organic material assimilated into microbial biomass and respiration that determines the amount of material that can be exported from one coastal environment to another. Further, the flow of organic material across coastal habitats is sensitive to environmental change as this can alter microbial remineralization and respiration rates. Our model highlights microorganisms as an integral part of coastal connectivity and emphasizes the importance of including a microbial perspective in coastal connectivity studies.

Keywords: coastal connectivity; conceptual model; microbial activity; organic matter; remineralization; respiration; spatial subsidy.

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Figures

Figure 1
Figure 1
The conceptual model of microbially mediated flow of organic matter between donor and recipient coastal habitats. Living OM, living organic matter; M, site of microbial action; POM, particulate organic matter; DOM, dissolved organic matter; DIM, dissolved inorganic matter; ΔPOM, transformed POM; ΔDOM, transformed DOM
Figure 2
Figure 2
(A) Microbially mediated exchange and transfer of matter between mangrove (donor habitat) and sea grass (recipient habitat) (B) hypothesized alterations to microbially mediated exchange and transfer of matter with environmental change (altered temperature and nutrient regimes). The gray arrows indicate direction of flow from the various components of the model, and the size of the symbol reflects the relative size of the pool or process

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