The purpose of this research grant is to continue on-going collaborative efforts to monitor the temporal and spatial dynamics of rocky intertidal populations and communities in southern and central California using Multi-Agency Rocky Intertidal Network (MARINe) protocols. An additional component of this project is to work with Principal Investigators leading MARINe to develop data analyses, data base improvement, programmatic changes, outreach tools, and reports. This work will provide important information needed to improve the ability of the primary contractor, the Bureau of Ocean Energy Management (BOEM), to document and understand changes in rocky intertidal systems resulting from changing ocean climate and regional urbanization, and to distinguish these changes from those that could result from major or minor oil spills or other disturbances from oil and gas development or extraction. The University of California, Santa Cruz (UCSC) is the principal contractor with BOEM and will administer a subcontract to the University of California Santa Barbara (UCSB). A goal of this research is to document spatial and temporal changes in southern and central California rocky intertidal communities in measured parameters across the region. This information will facilitate efforts to understand the causes and process implications of these changes. The goals of the project are to be met in collaboration with PIs at CSUF, UCSC, UCLA, CPP, and BOEM, as well as outside MARINe groups not funded as part of the BOEM agreement.