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Flowering herbs and grasses associated with longleaf pine savannas
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A major consequence of habitat fragmentation is an increase in the amount of edge habitat relative to core habitat in a landscape. Edges are known to influence many biological processes, including movement behaviors, dispersal, species interactions, resource distributions, and environmental conditions. Native longleaf pine savanna herbs are likely affected by the edges created between densely planted pine stands and openings created by forest thinning or clearing. We have empirically tested for such effects by planting nine species of native herbs at varying distances from an edge of dense forest into an adjacent opening (three grasses - Aristida beyrichiana, Schyzicharium scoparium, and Sorghastrum nutans; two asters - Carphephorous bellidifolius, and Liatris elegans; and four legumes - Baptisia lanceolata, Dalea pinnata, Desmodium marlandrica, and Galactia macreei). With John Orrock, Don Imm, and undergraduate collaborators, Sara Woolard, Elizabeth Long, and Sarah Gabris, we are determining how habitat edges alter the survivorship, growth, and reproduction for native plant communities of restoration concern. We have found that edges affect abiotic conditions and biotic interactions, altering individual species persistence and coexistence.
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