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Genetic characterization of fragmented populations of Cinchona officinalis L. (Rubiaceae), a threatened tree of the northern Andean cloud forests

Abstract:

Cinchona officinalis L., a tree species endemic to the cloud forests of the northern Tropical Andes, has suffered from historical bark harvesting for extraction of antimalarial compounds and has also experienced recent demographic losses from high rates of deforestation. Most remnant populations are found in severely degraded habitat on the edges of pastures while a minority are protected in private reserves. The goals of our research were to assess the genetic diversities of fragmented populations of C. officinalis in the Loja province of southern Ecuador, characterize their phylogeographic distribution with respect to the region’s complex topography, and identify priority populations for conservation. Five nuclear microsatellite loci and the chloroplast rps16 intron were used to analyze six populations. Moderate levels of genetic diversity were found in all populations although the more remote southern population (Angashcola) had slightly higher heterozygosity and allelic richness. There were no indications of recent genetic bottlenecks although an rps16 intron haplotype was fixed in four populations. Genetic distance analysis based on microsatellite data placed the four easternmost populations in the same clade while the Angashcola population was the most divergent. Also, the most frequent rps16 intron haplotype in Angashcola was not found in any other population. Although each of the studied populations should be protected from further deforestation and agricultural expansion, the Angashcola population deserves highest conservation priority.