. Bulletin - Southern California Academy of Sciences. Science. DETECTING DISTURBANCE WITH AN ASYMMETRICAL MULTIVARIATE BACI DESIGN 121 0 3 6 Kilometers. Los Ang< Edith Ellen • —.- •Eureka Fig. 1. A bathymetry map of the San Pedro Shelf, southern CaHfornia, USA, and the locations of the four offshore petroleum platforms sur\eyed in this study. Isobaths are in 10-m increments. Map created by C. Mireles (CSULB). at much higher rates than those in the corresponding intertidal areas (Blanchette et al. 2007). On offshore petroleum platforms, the resulting high biomass levels create a safet
. Bulletin - Southern California Academy of Sciences. Science. DETECTING DISTURBANCE WITH AN ASYMMETRICAL MULTIVARIATE BACI DESIGN 121 0 3 6 Kilometers. Los Ang< Edith Ellen • —.- •Eureka Fig. 1. A bathymetry map of the San Pedro Shelf, southern CaHfornia, USA, and the locations of the four offshore petroleum platforms sur\eyed in this study. Isobaths are in 10-m increments. Map created by C. Mireles (CSULB). at much higher rates than those in the corresponding intertidal areas (Blanchette et al. 2007). On offshore petroleum platforms, the resulting high biomass levels create a safety concern for normal operations (G. Shackell, Minerals Management Service, pers. comm.), such that federal law requires the periodic removal of the invertebrate layer in order to maintain structural integrity of the platforms. The regular nature of this particular event presents a unique opportunity to investigate the potential effects of disturbance on a biological system. The mid-water fish assemblages of petroleum platforms on the San Pedro Shelf are largely comprised of nearshore reef-associated species (Martin and Lowe 2010). As many of these species are typically dependent upon natural rocky reef habitats for shelter and prey, the dense invertebrate layer on these platforms presumably provides these resources in a location where they would othervv^ise not be found (Stephens et al. 2006). As a consequence, any changes in the abundance and distribution of Mytilus spp. on petroleum platforms will likely result in widespread and significant alterations to the species identity and relative abundances of platform-associated fish (, Syms and Jones 2000). Here we use a spatially- and temporally-replicated BACI framework to document the effects of a hydrocleaning event on the associated mid-water fish community of a southern California petroleum platform, relative to multiple control locations. As there was only one hypothesized "impact" platform versus th
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