Abstract
Stenocereus quevedonis (Ortega) Buxb., “pitire”, is an edible-fruit producing cactus endemic to tropical dry forests of central Mexico. It is silviculturally managed in areas disturbed for six decades. Previous studies showed that pollen flow among conserved and disturbed populations is feasible, but flower visitors have differential activity in those areas. That information and the increasing habitat fragmentation suggest possible differences in genetic diversity and gene flow among conserved and disturbed pitire populations; we therefore compared population genetics among conserved and disturbed sites, to identify actions for their in situ conservation. We sampled tissue from 20 adult pitires per site in three conserved and three disturbed sites. Samples were genotyped through six nuclear microsatellites to compare population genetics parameters through standard statistics and Bayesian analysis. Expected hetozygosity He varied (0.437–0.526), but no significant differences among disturbed and undisturbed sites were identified; gene flow Nm was 0.163–2.067, indicating overall genetic flow and drift equilibrium, but some populations show effects of drift. Genetic structure parameter Fst (0.048–0.020), indicate low genetic differentiation among populations. Bayesian analysis identified that one genetic group is absent in disturbed sites. Effects of disturbance on pitire populations are notorious due to loss of adult plants and one genetic group. Our findings suggest that low genetic differentiation might be in progress, only noticeable in genetic groups distribution but not in genetic diversity. It could be clearer in plants recruited after the disturbance events. Such effect could be buffered by actions favouring pollen and seed flow among populations.
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Acknowledgements
The authors thank financial support from the Research Projects CONACYT CB-2013-01-221800 and PAPIIT, DGAPA, UNAM IN206217. We also thank Edgar Pérez-Negrón for fieldwork assistance and Carmen Julia Figueredo for help in laboratory work.
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Paz-Guerrero, F., Casas, A. & Alvarado-Sizzo, H. Habitat fragmentation and population genetics of Stenocereus quevedonis (Cactaceae) in Michoacán, México: bases for in situ conservation of silvicultural managed genetic resources. Genet Resour Crop Evol 66, 633–643 (2019). https://doi.org/10.1007/s10722-018-00737-7
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DOI: https://doi.org/10.1007/s10722-018-00737-7