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Mem 117 c10-impact of disturbance on the demography of ceratozamia mexicana. sold by nybgshop.org for $4.99

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This purchase only includes chapter 10 of this title.

Abstract

Demographic studies of plants in contrasting habitats can contribute to the conservation¬†of rare and endangered species. Cycads are long-lived¬†dioecious plants that can often be¬†vulnerable, threatened, or endangered. Ceratozamia mexicana is a cycad endemic to Mexico.¬†The objective of this study was to compare the demography of two populations with¬†different¬†management histories (with and without disturbances). Matrix projections, population¬†growth rates (√鬼), sensitivity, elasticity, and life table¬†response experiments were¬†conducted for each population. Confidence limits for √鬼 were¬†1.0268 √ā¬Ī 0.0081 and¬†1.1361 √ā¬Ī 0.0036 for disturbed and nondisturbed populations, respectively. The transitions¬†found to contribute most to √鬼 in both populations were¬†the stasis of juvenile and nonreproductive¬†mature plants. The components of the mean elasticity matrix for the nondisturbed¬†population were¬†stasis, 0.502; transition 0.414; and fecundity, 0.085; while for the¬†disturbed population these¬†were¬†stasis, 0.479; transition, 0.429; and fecundity, 0.092.¬†Comparative analysis¬†(LTRE) between populations revealed that the contribution of¬†disturbance to the difference between population growth rates was significant (6.75%).

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