Strategies for conservation for disturbed Prosopis alba (Leguminosae, Mimosoidae) forests based on mating system and pollen dispersal parameters |
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Authors: | C Bessega C L Pometti M Ewens B O Saidman and J C Vilardi |
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Institution: | (1) Laboratorio de Gen?tica, Departamento de Ecolog?a, Gen?tica y Evoluci?n, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina;(2) Consejo Nacional de Investigaciones Cient?ficas y T?cnicas (CONICET), Buenos Aires, Argentina;(3) Estaci?n Experimental Fern?ndez, Departamento de Robles, Santiago del Estero, Argentina |
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Abstract: | Prosopis species forests in Argentina are increasingly fragmented in the last years mainly by the deforestation activity without any
reforestation strategy, the establishment of different crop plantations, and natural fires. The consequence of habitat fragmentation
on the genetic potential of Prosopis alba requires a fine-scale analysis of population structure, in particular mating system and pollen dispersal. By means of short
sequences repeats, we analyzed a fragmented population of this species in Santiago del Estero (Argentina). Most genetic variation
was observed among families within zones (65.5%), whereas the lowest proportion corresponded to the differentiation among
zones (2.8%). The fine analysis of structure at family level suggests that this population is complete outcrosser and there
is a low but significant biparental inbreeding. Outcrossing rates differ among mother plants and the proportion of full sibs
within mother plants ranged from 64% for seeds proceeding from the same pod to 10% for seeds from different pods. The average
pollen dispersal distance was estimated to be among 5.36 and 30.92 m by using the KinDist or TwoGener approach. About seven
pollen donors are siring each progeny array and the number of seed trees necessary for seed collection aiming to retain an
effective population size of 100 was estimated in 16–39 individuals depending on the relatedness estimator used. Pollen and
seed dispersal would be limited, what determines the need of conserving short distant patches to avoid the effects of inbreeding
and drift within populations as a consequence of intensive use resource for agriculture. |
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