Spatial genetic structure, population dynamics, and spatial patterns in the distribution of Ocotea catharinensis from southern Brazil: implications for conservation

Tiago Montagna, Miguel Busarello Lauterjung, Rafael Candido-Ribeiro, Juliano Zago da Silva, Marcia Patricia Hoeltgebaum, Newton Clóvis Freitas da Costa, Alison Paulo Bernardi, Maurício Sedrez dos Reis
2018 Canadian Journal of Forest Research  
20 In this study, we employ an integrated demographic/genetic approach with the aim of 21 informing efforts to conserve Ocotea catharinensis, an endangered tree species from the 22 Brazilian Atlantic Rainforest. After establishing two permanent plots (15 and 15.5 ha) 23 within Protected Areas in Santa Catarina state, Brazil, we evaluated demographic aspects 24 (density, recruitment, mortality and growth), spatial pattern, genetic diversity and spatial 25 genetic structure (SGS) in three
more » ... S) in three categories of individuals (seedlings, juveniles and 26 reproductive) over two years. Studied populations presented low recruitment of individuals 27 and low rates of increment in diameter and height. Aggregation was the main spatial pattern 28 observed for both populations. High levels of genetic diversity were estimated for both 29 populations, but also high levels of fixation index, signaling the risk of losing genetic 30 diversity over generations. Significant SGS was found for both populations, reflecting 31 nonrandom distribution of the genotypes. Demographic and genetic surveys also allowed 32 the estimation of minimum viable areas for genetic conservation (> 170 ha), deme sizes 33 (around 10 ha) and distances for seed collection (at least 60 m). Effective population size is 34 restricted in studied populations, locally threatening the species perpetuation over 35 generations. Further research can clarify how this condition it will change in subsequent 36 years. 37 38
doi:10.1139/cjfr-2017-0446 fatcat:caqyxwfhtbbenkkwk7ya6pvdpu