PubMed · 12018062
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D Arbogast. Exporting care.. https://pubmed.ncbi.nlm.nih.gov/12018062/
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The distribution of plant species, the species compositions of different sites, and the factors that affect them in tropical rain forests are not well understood. The main hypotheses are that species composition is either (i) uniform over large areas, (ii) random but spatially autocorrelated because of dispersal limitation, or (iii) patchy and environmentally determined. Here we test these hypotheses, using a large data set from western Amazonia. The uniformity hypothesis gains no support, but the other hypotheses do. Environmental determinism explains a larger proportion of the variation in floristic differences between sites than does dispersal limitation; together, these processes explain 70 to 75% of the variation. Consequently, it is important that management planning for conservation and resource use take into account both habitat heterogeneity and biogeographic differences.
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Sixty-three of 89 identified intensive care units in Colombia (Evaluation of Intensive Care in Colombia) participated in this voluntary study. A convenience sample of 20 intensive care units, each submitting 200 patients or more, was chosen, from which the following information is presented. The Intensive Care National Audit and Research Center (UK) protocol was used to evaluate patient severity, length of stay, raw and anticipated mortality, intensive care unit patient admission/rejection criteria, and human and technologic resources available. Information was drawn from public and private institutions.