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| griddap | Subset | tabledap | Make A Graph | wms | files | Accessible | Title | Summary | FGDC | ISO 19115 | Info | Background Info | RSS | Institution | Dataset ID | |
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| log in | [Lottia field experiment 2023] - Lottia gigantea growth data from field experiments of experimentally manipulated competitor densities on the Northern and Central California coast from Feb to Dec 2023 (Evolutionary and ecological dynamics of a contemporary climate-driven range expansion) | We harnessed an ongoing poleward range shift of the giant owl limpet (Lottia gigantea) in California, USA to test whether the effects of competition vary between the range core and expanding edge. To assess the strength of competition across the range, we experimentally manipulated densities of L. gigantea, and a competing grazer (L. scabra), at five rocky intertidal sites and measured limpet growth over ~10 months as a metric of performance. \n\nAs predicted, field surveys confirmed that L. gigantea density was higher in the range core than the range edge. Contrary to theory, range-core limpets that evolved in these dense populations were more strongly impacted by intra- and interspecific competition than range-edge limpets when both were held under standardized experimental densities of competitors. Importantly, both forms of competition had similar effects across the range, even though interspecific competition is rarely integrated into range-expansion theory. Consistent with theory, growth rates were fastest at the expanding edge. \n\nHowever, growth in range-edge limpets did not decline under high intra- and interspecific densities, suggesting that rapid growth rate did not come at the cost of reduced competitive ability. Growth in the expanded range may be enhanced by greater food availability as cooler temperatures lower metabolic demand and ameliorate competition. Our findings suggest that predicting the dynamics of range expansions will require greater consideration of how diverse recipient communities and environmental heterogeneity mediate the strength of competition and performance across an expanding species' range.\n\ncdm_data_type = Other\nVARIABLES:\nBlock (unitless)\nTreatment (unitless)\nTag (unitless)\nSite (unitless)\ndate_initial (unitless)\nLength_initial (mm)\nLength_final (mm)\n... (5 more variables)\n | BCO-DMO | bcodmo_dataset_1000489_v1 |