Genetic diversity,genetic drift and mixed mating system in small subpopulations of <Emphasis Type="Italic">Dyckia ibiramensis</Emphasis>, a rare endemic bromeliad from Southern Brazil |
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Authors: | Karina Vanessa Hmeljevski Ademir Reis Tiago Montagna Maurício Sedrez dos Reis |
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Institution: | 1.Instituto de Pesquisas Jardim Botanico do Rio de Janeiro,Rio de Janeiro,Brazil;2.Laboratório de Restaura??o Ambiental Sistêmica, Departamento de Botanica, Centro de Ciências Biológicas,Universidade Federal de Santa Catarina,Florianópolis,Brazil;3.Núcleo de Pesquisas em Florestas Tropicais, Departamento de Fitotecnia, Centro de Ciências Agrárias,Universidade Federal de Santa Catarina,Florianópolis,Brazil |
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Abstract: | Dyckia ibiramensis is a naturally rare, endemic and threatened bromeliad which occurs naturally on 4 km of rocky river outcroppings in Southern
Brazil. For this study, subpopulations of the species were characterized based on size and genetics, to compile information
for in situ and ex situ conservation strategies. A census of the rosettes was undertaken for each subpopulation and seven allozyme polymorphic loci
were used to estimate genetic diversity and structure of adults and offspring and assess the mating system. In general, the
subpopulations were small and most of the rosettes were aggregated into clumps. The species showed a high genetic diversity
(^(H)]e = 0.219 \hat{H}_{e} = 0.219 ) and significant fixation index (^(f)] = 0.642, \hat{f} = 0.642,
P ≤ 0.05). The estimate of differentiation among all adult subpopulations indicate pronounced genetic structure (^(G)]¢ST = 0.674 \hat{G}^{\prime}_{ST} = 0.674 ). D. ibiramensis has a mixed mating system and multilocus outcrossing rates ^(t)]m \hat{t}_{m} were variable between subpopulations. This study demonstrates the importance of in situ preservation of all subpopulations
for the maintenance of species diversity. For effective ex situ conservation, it would be necessary to collect seeds from 52 to 99 seed-rosettes, depending on the target population. |
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