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Aggregation of Coleonyx variegatus in diurnal shelter sites is shown to be a statistically valid phenomenon, confirming earlier reports based on subjective impressions. Preliminary data on causative factors suggest that limited burrow availability promotes aggregation. Experiments in which two individuals were placed in cages having an excess of burrows revealed no indication of interindividual attraction. However, these results do not exclude the operation of social factors in aggregation. On the contrary, pilot data provide hints that the sexes may differ in aggregative behavior. We hypothesize that lizard density, sex, and physical variables such as temperature and moisture may be associated with joint burrow...
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Abstract (from http://www.springerplus.com/content/3/1/589): The growing quality and availability of spatial map layers (e.g., climate, geology, and land use) allow stream studies, which historically have occurred over small areas like a single watershed or stream reach, to increasingly explore questions from a landscape perspective. This large-scale perspective for fluvial studies depends on the ability to characterize influences on streams resulting from throughout entire upstream networks or catchments. While acquiring upstream information for a single reach is relatively straight-forward, this process becomes demanding when attempting to obtain summaries for all streams throughout a stream network and across...
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We characterized coastal wetland responses to flooding stress by measuring vegetation cover, wetland elevation and water elevation in healthy and degrading wetlands dominated by Spartina patens. Wetland elevation was measured using real-time kinematic survey methods. Vegetation cover was determined by visual estimation methods, and water elevation was measured using in situ continuous recorders. In addition to these local-scale responses, we also measured landscape-scale patterns of land and water aggregation or fragmentation using remotely sensed data (Jones et al., 2018). Associated products: Jones, W.R., Hartley, S.B., Stagg, C.L., and Osland, M.J. 2018. Land-water classification for selected sites in McFaddin...
map background search result map search result map An approach for aggregating upstream catchment information to support research and management of fluvial systems across large landscapes Local and landscape-scale data describing patterns of coastal wetland loss in the Texas Chenier Plain, U.S.A., 2017-2018 Local and landscape-scale data describing patterns of coastal wetland loss in the Texas Chenier Plain, U.S.A., 2017-2018 An approach for aggregating upstream catchment information to support research and management of fluvial systems across large landscapes