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dc.contributor.authorShanks, Alan L.
dc.contributor.authorMorgan, Steven G.
dc.contributor.authorMacMahan, Jamie
dc.contributor.authorReniers, Ad J.H.M.
dc.date.accessioned2018-06-29T19:59:39Z
dc.date.available2018-06-29T19:59:39Z
dc.date.issued2017
dc.identifier.citationAlan l. Shanks, Steven G. Morgan, Jamie MacMahan, AD J. H. M. Reniers "Alongshore variation in barnacle populations is determined by surf zone hydrodynamics." Ecological Monographs, 87(3), 2017, pp. 508–532
dc.identifier.urihttp://hdl.handle.net/10945/59119
dc.descriptionThe article of record as published may be found at http://doi.org/10.1002/ecm.1265
dc.description.abstractLarvae in the coastal ocean are transported toward shore by a variety of mechanisms. Crossing the surf zone is the last step in a shoreward migration and surf zones may act as semipermeable barriers altering delivery of larvae to the shore. We related variation in the structure of intertidal barnacle populations to surf zone width (surf zone hydrodynamics proxy), wave height, alongshore wind stress (upwelling proxy), solar radiation, and latitude at 40 rocky intertidal sites from San Diego, California to the Olympic Peninsula, Washington. We measured daily settlement and weekly recruitment of barnacles at selected sites and related these measures to surf zone width. Chthamalus density varied inversely with that of Balanus, and the density of Balanus and new recruits was negatively related to solar radiation. Across the region, long-term mean wave height and an indicator of upwelling intensity and frequency did not explain variation in Balanus or new recruit densities. Balanus and new recruit densities, daily settlement, and weekly recruitment were up to three orders of magnitude higher at sites with wide (>50 m), more dissipative surf zones with bathymetric rip currents than at sites with narrow (<50 m) more reflective surf zones. Surf zone width explained 30–50% of the variability in Balanus and new recruit densities. We sampled a subset of sites <5 km apart where coastal hydrodynamics such as upwelling should be very similar. At paired sites with similar surf zone widths, Balanus densities were not different. If surf zone widths at paired sites were dissimilar, Balanus densities, daily settlement, and weekly recruitment were significantly higher at sites with the wider, more dissipative surf zone. The primary drivers of surf zone hydrodynamics are the wave climate and the slope of the shore and these persist over time; therefore site-specific stability in surf zone hydrodynamics should result in stable barnacle population characteristics. Variations in surf zone hydrodynamics appear to play a fundamental role in regulating barnacle populations along the open coast, which, in turn, may have consequences for the entire intertidal community.en_US
dc.description.sponsorshipNational Science Foundation
dc.format.extent25 p.en_US
dc.publisherEcological Society of Americaen_US
dc.rightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.en_US
dc.titleAlongshore variation in barnacle populations is determined by surf zone hydrodynamicsen_US
dc.typeArticleen_US
dc.contributor.departmentOceanography
dc.subject.authorBalanusen_US
dc.subject.authorChthamalusen_US
dc.subject.authorlarval recruitmenten_US
dc.subject.authorlarval settlementen_US
dc.subject.authorlatitudinal variationen_US
dc.subject.authorrip currenten_US
dc.subject.authorsurf zone hydrodynamicsen_US
dc.subject.authorupwellingen_US
dc.description.funderNSF-OCE#092735


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