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dc.contributorWe would like to thank the California Artificial Reef Enhancement (CARE) project, University of Southern California (USC) Sea Grant, the Southern California Tuna Club (SCTC) Marine Biology Educational Scholarship Foundation, and the Los Angeles Rod and Reel Club Foundation for funding. We thank J. Allen, M. Love, A. Bull, and D. Schroeder for their help and insight with respect to the project. Our manuscript was improved by the comments of several anonymous reviewers. Dive safety concerns were guided by J. Cvitanovich, S. Liles (Pacific Energy Resources LLC.), S. Robertson (DCOR LLC.), and B. Boyce (AERA LLC); experienced research divers from CSULB included C. Mireles, A. Floyd, S. Trbovich, K. Jirik, C. Mull, L. Fink, T. Mason, E. Jarvis, T. Farrugia, B. Rogers, H. Gliniak, H. Zemel, G. McMicheal, J. Ayres, K. Loke, B. Wohlers, F. Murgolo, and K. Anthony.
dc.contributor.authorMartin, Christopher J.B.
dc.contributor.authorAllen, Bengt J.
dc.contributor.authorLowe, Christopher G.
dc.date.accessioned2020-09-03T11:17:49Z
dc.date.available2020-09-03T11:17:49Z
dc.identifier.urihttps://scholar.oxy.edu/handle/20.500.12711/9315
dc.description.abstractOne of the primary challenges to detecting anthropogenic environmental impacts is the high degree of spatial and temporal variability inherent in natural systems. Planned or routine events that result in disturbance to populations and communities provide an opportunity for scientists to apply well-replicated and statistically powerful sampling designs to assess subsequent biological effects. For example, a thick layer of sessile invertebrates is the prominent biotic feature of intertidal and shallow subtidal portions of offshore petroleum platforms in southern California. Given the central role of such invertebrates in providing food and shelter, their presence can reasonably be expected to influence associated fish community structure. At one platform on the San Pedro Shelf, invertebrate biomass was completely removed from support pilings and horizontal crossmembers to a depth of 20 m with high-pressure water during a standard “hydrocleaning” event in November 2007. Three nearby platforms remained undisturbed, providing a unique opportunity to test for disturbance-related changes in the local fish assemblage and the overall time course of community recovery. The potential impact of the abrupt and intense removal of the invertebrate layer was assessed with survey data collected periodically for one year prior- and one year post-hydrocleaning in a modified Before-After-Control-Impact (BACI) design. Asymmetrical multivariate analyses of variance revealed a significant effect of disturbance to fish, driven largely by reductions in the abundance of numerically dominant blacksmith (Chromis punctipinnis). Nevertheless, the system was surprisingly resilient, recovering to pre-disturbance conditions within ten months. Our results demonstrate that a well-replicated BACI sampling design can detect even subtle biological changes in response to disturbance, a key step towards developing a mechanistic understanding of community disassembly in the face of increasingly frequent and intense perturbations.
dc.subjectFishes
dc.subjectcommunity
dc.subjectBACI
dc.subjectinvertebrates
dc.titleEnvironmental Impact Assessment: Detecting Changes in Fish Community Structure in Response to Disturbance with an Asymmetric Multivariate BACI Sampling Design
dc.title.alternativeDetecting Disturbance with an Asymmetrical Multivariate BACI Design
dc.typearticle
dc.abstract.formatonep
dc.source.issuescas/vol111/iss2
dc.source.issue2
dc.identifier.legacyhttps://scholar.oxy.edu/scas/vol111/iss2/2
dc.source.peer_reviewedTRUE
dc.source.statuspublished
dc.source.journaltitleScas: Bulletin of the Southern California Academy of Sciences


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