Abstract
Studies over the past 20 years on natural populations indicated that sympatric speciation may be far more common and widespread among plants and animals than previously thought. By using molecular phylogenetics (on a combined data set of two genes), the relationships between Caryedon serratus native forms and forms feeding on groundnut was investigated. The specific objectives were to clarify the taxonomic status of C. serratus feeding on Cassia sieberiana DC. Morphological analysis was conducted, using parts of the adult specimens which were dry-mounted for the studies. Morphological study comprised extraction of the genitalia, which were cleared and mounted in Canada balsam following standard procedures. Results showed a strong differentiation of insects from different hosts’ trees, with specimens from C. sieberiana possibly representing a sibling species. Key words: Caryedon serratus, phylogeny, taxonomy, Cytochrome B, ITS, groundnut, Cassia sieberiana.
Highlights
The preservation of biodiversity requires knowing the degree of variety of what is to be preserve
A strong differentiation clearly exists between C. serratus feeding on C. sieberiana and on the four other host plants
The individuality of “C. sieberiana” samples may be explained by an incipient sympatric speciation or by the existence on C. sieberiana of a sibling species of C. serratus as a result of a previous diffe-rentiation of populations in allopatry, with presentday overlap of C. sieberiana and other host plants
Summary
The preservation of biodiversity requires knowing the degree of variety of what is to be preserve. Species are unevenly distributed in their area of distribution. They are divided into several populations, of which migration is allowed. The rates of migration of individuals from a population to another can vary according to the considered species, their capacities to move on long distances and the nature of the environment that separates the populations (that is, if it is very hostile to the sort or not). Migration is not the only parameter to be taken into account when the genetic structuralization of a species is being studied. The demography of the populations constitutes a parameter as important as the migration. At rate of equal migration, the differentiation between populations by genetic drift is made much quicker in small-sized populations than in populations with big strength
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