Evaluating stability in Ziziphus celata, a highly endangered clonal shrub endemic to Lake Wales Ridge, central Florida
نویسندگان
چکیده
Florida ziziphus Ziziphus celata is a self-incompatible clonal shrub comprising fewer than a dozen remnant, uniclonal populations in south-central Florida, USA. We model the population viability of this highly endangered species based on 9 yr of data from 2 populations. The matrix projection model is based on hypothetically independent ‘plants’ defined as clumps of ramets within a 25 cm radius. Seedling recruitment is unknown in the uniclonal study populations and is not modeled. The populations modeled here have stable demographies characterized by high survival and stasis, but variable levels of new plant production (clonal recruitment). Population growth rates suggest protracted long-term declines in population size, but predicted extinction rates over 50 yr are as high as 20% in one population. Changes in new plant production and survival had greater effects on population growth rates than did changes in growth rates of individual plants. Augmenting clonal plant production and protecting survival of new ‘plants’ are short-term management goals. The establishment of sexually reproducing populations through the translocation of cross-compatible genotypes is a long-term necessity for the persistence of Florida ziziphus populations.
منابع مشابه
Genetic impoverishment and cross-incompatibility in remnant genotypes of Ziziphus celata (Rhamnaceae), a rare shrub endemic to the Lake Wales Ridge, Florida
The loss of genetic diversity in fragmented populntions of self-incompalible plant species may result in sexual mproductive f%lure and local extinctions. Florida ziziphus (Ziziphus c&m) i s a self-incompetiblc clonal shrub known only from five genetically depaupemre populations on the Lake Wales Ridge. Florida, USA. Recovery of thix spccics rcyuirex identification of cross-compatible genotypes ...
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