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Chairman: Dr. Peeter Noges & Dr. M. A. Khan |
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Recovery
and restoration of critically endangered plant species entails understanding of
autoecology of the species, population genetic structure and creation of new
self sustaining populations in the type habitats. Although a large number of
plant species of the Western Ghats are critically endangered, little is know
about their autoecological details, which severely handicap the conservation
efforts. In this paper we report on an effort to initiate recovery of a recently
described, critically endangered tree species of freshwater swamps viz., Semecarpus
kathalekanensis. We studied the breeding structure of the species; assessed
its genetic structure adopting isozyme and RAPD markers and evaluated the
survival of two newly created populations.
Several
distinct biological features complicate the recovery of S. kathalekanensis. Acquisition
of founding propagules to create self-sustaining populations is difficult
because of its high habitat specificity, consistently small population sizes,
dioecious breeding system, skewed sex ratio and recalcitrant nature of the
seeds. Further, random gamete exchange among the breeding individuals may be
restricted due to a significant asynchrony in flowering noticed among the male
and female trees within a population. Consequently the populations may suffer
from huge heterozygote deficiency. Analysis of isozyme and RAPD data supports
this view. This genetic bottlenecking may be one of the factors influencing poor
recruitment of the species. The human induced habitat destruction has further
pushed this species into a stratum below the level of criticality. In order to
restore the populations, laboratory-grown seedlings were reintroduced into two
type localities and monitored for two years. Fortunately, S.
kathalekanensis responds favourably
to artificial transplanting in its typical habitat. Species was successfully
established in newer localities. We discuss the structure of recovery plans for
such critically endangered plant species of the Western Ghats in the light of
the present study.
Address:
Department of Forest Biology, College of Forestry, Sirsi 581 401. India
Department of Crop Physiology,
Department of Plant Breeding and Genetics,
University of Agricultural Sciences, GKVK, Bangalore 560 065. India
Ashoka Trust for Research on Ecology and Environment,
# 659, 9th main Hebbal, Bangalore 560 065, India
Ph: 0838 428515 Fax: 428486
E-mail: vasukoppa@yahoo.com