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5 results for “Epidendrum radicans”
Epidendrum radicans - genetic data of 4 regional populations
<p>Colonization is a fundamental ecological process that is important for the persistence of species, particularly when a changing environment necessitates range shifts. Vacant habitats available for colonization often arise from landscape disturbance. Colonization and population expansion processes can be inferred by examining the levels and spatial distribution of genetic variation of plant populations with known disturbance histories. Samples (N = 690) of the terrestrial orchid, <em>Epidendrum radicans</em>, were collected from five lava flow sites on the slopes of Volcán Arenal in Costa Rica that last experienced major eruptions in 1968 and 1992. Individuals were also sampled (N = 188) from four regional populations. Samples were characterized using 15 nuclear genetic markers and analyzed using population genetics statistics. Genetic diversity within sites was moderate (He = 0.092 – 0.192). Contrary to expectation, diversity tended to be lower on the older lava flows (0.131 versus 0.172) which may reflect their more sheltered topography that restricted pollen/seed immigration, and/or greater intra- and interspecific competition. Genetic diversity measures indicate that the lava flows were colonized by numerous individuals that likely originated from multiple sources while spatial genetic structure (SGS) statistics indicate that most recruitment in the study sites subsequent to colonization resulted from <em>in situ</em> reproduction and localized seed deposition. Younger sites had significantly greater SGS over larger distances which reflects fewer reproductive events, and less spatial and temporal overlap of seed shadows relative to the older sites. Clones were also generally larger on the older sites (≤ 8m versus ≤ 3m).</p>
Epidendrum radicans – x, y coordinates and genetic data of individuals within 5 focal populations
<p>Colonization is a fundamental ecological process that is important for the persistence of species, particularly when a changing environment necessitates range shifts. Vacant habitats available for colonization often arise from landscape disturbance. Colonization and population expansion processes can be inferred by examining the levels and spatial distribution of genetic variation of plant populations with known disturbance histories. Samples (<em>N</em> = 690) of the terrestrial orchid, <em>Epidendrum radicans</em>, were collected from five lava flow sites on the slopes of Volcán Arenal in Costa Rica that last experienced major eruptions in 1968 and 1992. Individuals were also sampled (<em>N</em> = 188) from four regional populations. Samples were characterized using 15 nuclear genetic markers and analyzed using population genetics statistics. Genetic diversity within sites was moderate (<em>H<sub>e</sub></em> = 0.092–0.192). Contrary to expectation, diversity tended to be lower on the older lava flows (0.131 versus 0.172) which may reflect their more sheltered topography that restricted pollen/seed immigration, and/or greater intra- and interspecific competition. Genetic diversity measures indicate that the lava flows were colonized by numerous individuals that likely originated from multiple sources while spatial genetic structure (SGS) statistics indicate that most recruitment in the study sites subsequent to colonization resulted from <em>in</em> <em>situ</em> reproduction and localized seed deposition. Younger sites had significantly greater SGS over larger distances which reflects fewer reproductive events, and less spatial and temporal overlap of seed shadows relative to the older sites. Clones were also generally larger on the older sites (≤ 8m versus ≤ 3m).</p>
Epidendrum radicans - genetic data of 4 regional populations
Open the record for dataset details and reuse information.
Epidendrum radicans – x, y coordinates and genetic data of individuals within 5 focal populations
Open the record for dataset details and reuse information.
FIGURE. Orchidaceae from Honduras. A. Epidendrum oerstedii. B. E. paranthicum. C. E. parkinsonianum. D. E. polyanthum. E. E. porpax. F. Epidendrum pseudoschumannianum. G. E. radicans. H. E. radioferens. I. E. repens. J. E. santaclarense. K. E. schweinfurthianum. L. E. stamfordianum. M. E. trachythece. N. E. verrucosum. O. Erycina pusilla. P in An Updated Checklist of the Orchidaceae of Honduras
FIGURE. Orchidaceae from Honduras. A. Epidendrum oerstedii. B. E. paranthicum. C. E. parkinsonianum. D. E. polyanthum. E. E. porpax. F. Epidendrum pseudoschumannianum. G. E. radicans. H. E. radioferens. I. E. repens. J. E. santaclarense. K. E. schweinfurthianum. L. E. stamfordianum. M. E. trachythece. N. E. verrucosum. O. Erycina pusilla. P. Eulophia alta. Photographs by the authors, except F (J. Hernández) and I (D. Cruz).
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