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2013 ; 111
(6
): 1059-73
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A review of the allozyme data set for the Canarian endemic flora: causes of the
high genetic diversity levels and implications for conservation
#MMPMID23609020
Pérez de Paz J
; Caujapé-Castells J
Ann Bot
2013[Jun]; 111
(6
): 1059-73
PMID23609020
show ga
Background and Aims Allozyme and reproductive data sets for the Canarian flora
are updated in order to assess how the present levels and structuring of genetic
variation have been influenced by the abiotic island traits and by
phylogenetically determined biotic traits of the corresponding taxa; and in order
to suggest conservation guidelines. Methods Kruskal-Wallis tests are conducted to
assess the relationships of 27 variables with genetic diversity (estimated by A,
P, Ho and He) and structuring (GST) of 123 taxa representing 309 populations and
16 families. Multiple linear regression analyses (MLRAs) are carried out to
determine the relative influence of the less correlated significant abiotic and
biotic factors on the genetic diversity levels. Key Results and Conclusions The
interactions between biotic features of the colonizing taxa and the abiotic
island features drive plant diversification in the Canarian flora. However, the
lower weight of closeness to the mainland than of (respectively) high basic
chromosome number, partial or total self-incompatibility and polyploidy in the
MLRAs indicates substantial phylogenetic constraint; the importance of a high
chromosome number is feasibly due to the generation of a larger number of linkage
groups, which increase gametic and genotypic diversity. Genetic structure is also
more influenced by biotic factors (long-range seed dispersal, basic chromosome
number and partial or total self-incompatibility) than by distance to the
mainland. Conservation-wise, genetic structure estimates (FST/GST) only reflect
endangerment under intensive population sampling designs, and neutral genetic
variation levels do not directly relate to threat status or to small population
sizes. Habitat protection is emphasized, but the results suggest the need for
urgent implementation of elementary reproductive studies in all cases, and for ex
situ conservation measures for the most endangered taxa, even without prior
studies. In non-endangered endemics, multidisciplinary research is needed before
suggesting case-specific conservation strategies. The molecular information
relevant for conservation should be conserved in a standardized format to
facilitate further insight.