Biotic Interactions (GloBI) · NCBI – National Center for Biotechnology Information. Alsophila firma. Open Interactive Map. Alsophila firma image. Click to Display. Brief summary. No one has contributed a brief summary to this page yet. Explore what EOL knows about Alsophila firma. Add a brief summary to this page. Alsophila firma (Baker) D.S. Conant is an accepted name. This name is the accepted name of a species in the genus Alsophila (family Cyatheaceae). The record.
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Evolution of the climatic niche in scaly tree ferns Cyatheaceae, Polypodiopsida. This is a rare species that occurs mainly as a riparian species in montane cloud forests from Girma to Panama and western Ecuador, with stems that can reach 15 m in height Gastony, Kinship coefficients were computed for 20 distance intervals maximum distance in metres that were arbitrarily defined to maximize the number of pairwise comparisons.
Contrary to our expectations, an outcrossing breeding system, wind dispersal and an arborescent life form did not translate into weak or no SGS. The location of individual stems was carefully mapped using the distance m and compass bearings between individuals, thus obtaining the relative spatial fitma of each individual. Marked spatial genetic structure in three populations of a weedy fern, Pteris multifida Poir. Recent studies suggest strongly that Hymenophyllopsis nests within Cyathea as they both share marginal scales without apical setae and cyatheoid cup-shaped indusia Korall et al.
Dicksoniaceae and Cibotium ca.
These analyses were carried out on the total number of individual stems AH: The timestamp is only as accurate as the clock fima the camera, and it may be completely wrong. The extant scaly tree ferns are commonly found in the tropics, from the wet lowlands to mid elevations. In both populations of A. The stems are usually short-creeping to sub-erect or erect.
Permutation tests showed that regression slopes were significantly different from zero in all analyses Table 2. The implications of chloroplast DNA restriction site alophila on the classification and phylogeny of the Cyatheaceae.
Alsophila firma (Baker) D.S.Conant
The levels of SGS alsopuila between the two analysed populations of A. New combinations and an overview of Cyathea subg. Spatial autocorrelation analysis of individual multiallele and multilocus genetic structure.
In this life cycle, meiosis and fertilization occur in different plants and zlsophila is mainly achieved through propagules spores that develop prior to fertilization. Leave a Reply Cancel reply. Higher fine-scale genetic structure in peripheral than in core populations of a long-lived alsophia mixed-mating conifer — eastern white cedar Thuja occidentalis L.
Along with the geographical isolation of the tepuis, it appears that the climatic conditions in the Roraima formation have facilitated the evolution of a group of plants with morphological adaptations very different to those normally associated to the scaly tree ferns.
Shared haplotypes between populations are indicated in bold. Views View Edit History. In plants with wind dispersion and random mating, the values of observed heterozygosity H O should approach those of gene diversity H S. This assessment, however, would be limited by the difficulty of studying natural population of gametophytes, mainly resulting from highly similar gametophyte morphologies across species Conant, Geostatistical genetic analysis for inferring the dispersal rirma of a partially clonal species: However, the presence of identical ramets in distinct spatial clusters might be the result of sexual reproduction.
Furthermore, study of the spatial genetics and demography of the two life stages of ferns would be highly valuable in increasing our understanding of the causes of SGS in these plants. A molecular phylogeny of scaly tree ferns Cyatheaceae.
Cyatheaceae: The Scaly Tree Ferns | Tropical Biodiversity
Therefore, the strong spatial aggregation observed in the two populations of A. It is estimated there are ca. However, they differ from Cyatheaceae by the presence of hairs instead of scales alsophiila indumentum Korall et al.
Alternatively, frequent clonal growth would result in a significant spatial clustering of individuals and populations should thus exhibit increased levels of inbreeding, low levels of genetic diversity and higher SGS.
The localized dispersal of propagules has been considered one of the main processes alsophioa SGS Heywood, ; Loiselle et al. The second site Tlanchinol, Hidalgo: