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Land Use and Salinity Drive Changes in SAV Abundance and Community Composition

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dc.contributor.author Patrick, Christopher J. en
dc.contributor.author Weller, Donald E. en
dc.contributor.author Orth, Robert J. en
dc.contributor.author Wilcox, David J. en
dc.contributor.author Hannam, Michael P. en
dc.date.accessioned 2017-06-10T09:10:49Z
dc.date.available 2017-06-10T09:10:49Z
dc.date.issued 2018
dc.identifier.citation Patrick, Christopher J., Weller, Donald E., Orth, Robert J., Wilcox, David J., and Hannam, Michael P. 2018. "<a href="https://repository.si.edu/handle/10088/32560">Land Use and Salinity Drive Changes in SAV Abundance and Community Composition</a>." <em>Estuaries and Coasts</em>. 41 (Supplement 1):85&ndash;100. <a href="https://doi.org/10.1007/s12237-017-0250-1">https://doi.org/10.1007/s12237-017-0250-1</a> en
dc.identifier.issn 1559-2723
dc.identifier.uri https://hdl.handle.net/10088/32560
dc.description.abstract Conserving and restoring submerged aquatic vegetation (SAV) are key management goals for estuaries worldwide because SAV integrates many aspects of water quality and provides a wide range of ecosystem services. Management strategies are typically focused on aggregated abundance of several SAV species, because species cannot be easily distinguished in remotely sensed data. Human land use and shoreline alteration have been shown to negatively impact SAV abundance, but the effects have varied with study, spatial scale, and location. The differences in reported effects may be partly due to the focus on abundance, which overlooks within-community and among-community dynamics that generate total SAV abundance. We analyzed long-term SAV aerial survey data (1984 2009) and ground observations of community composition (1984 2012) in subestuaries of Chesapeake Bay to integrate variations in abundance with differences in community composition. We identified five communities (mixed freshwater, milfoil-Zannichellia, mixed mesohaline, Zannichellia, and Ruppia-Zostera). Temporal variations in SAV abundance were more strongly related to community identity than to terrestrial stressors, and responses to stressors differed among communities and among species. In one fifth of the subestuaries, the community identity changed during the study, and the probability of such a change was positively related to the prevalence of riprapped shoreline in the subestuary. Mixed freshwater communities had the highest rates of recovery, and this may have been driven by Hydrilla verticillata, which was the single best predictor of SAV recovery rate. Additional species-specific and community-specific research will likely yield better understanding of the factors affecting community identity and SAV abundance, more accurate predictive models, and more effective management strategies. en
dc.relation.ispartof Estuaries and Coasts en
dc.title Land Use and Salinity Drive Changes in SAV Abundance and Community Composition en
dc.type Journal Article en
dc.identifier.srbnumber 142934
dc.identifier.doi 10.1007/s12237-017-0250-1
rft.jtitle Estuaries and Coasts
rft.volume 41
rft.issue Supplement 1
rft.spage 85
rft.epage 100
dc.description.SIUnit SERC en
dc.description.SIUnit Peer-reviewed en
dc.citation.spage 85
dc.citation.epage 100

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