Isoenzyme variability of five principal triatomine vector species of Chagas disease in Mexico

Biological and genetic aspects of experimental hybrids from species of the Phyllosoma complex (Hemiptera: Reduviidae: Triatominae)

“…In our study, successful results (couples with offspring) in each type of cross seem to be correlated to the distance between species in some phylogenetic trees (Flores et al 2001, Marcilla et al 2001. The most successful crosses were those that occurred between phylogenetically closer species, such as M. longipennis and M. picturatus, which have been sympatrically collected in Western Mexico.…”

“…This could be correlated with the phylogenetic proximity between these two species, which has been previously established in most related molecular studies (Bargues et al 2000, Flores et al 2001, Marcilla et al 2001, Pfeiler et al 2006 (Mazzotti & Osorio 1942, Zárate et al 1985.…”

“…Similarly, the biological species concept states that "a species is a group of interbreeding natural populations that is reproductively isolated from other such groups" (Mayr & Ashlock 1991). In accordance with this latter concept, in light of some previously published works (Flores et al 2001, Takashi-Obara et al 2007, M. picturatus, M. pallidipennis and M. longipennis (species collected previously in sympatric occurrence) could be considered subspecies of M. phyllosomus. Also, biological evidence found in this study could support the proposition that it is more appropriate to attribute a subspecies level to both M. longipennis and M. picturatus, as proposed in the case of M. pallidipennis (Martínez-Ibarra et al 2005).…”

“…On the other hand, M. longipennis appears to have a moderate degree of reproductive isolation with respect to M. mazzottii, as suggested previously (Zárate et al 1985), and a low degree in relation to M. picturatus. A possible reason may be the fact that M. longipennis and M. picturatus are phylogenetically closer to each other than M. mazzottii is to any of the other studied species (Bargues et al 2000, Flores et al 2001, Marcilla et al 2001. Another reason is the existence of a correlation between geographic distance and degree of reproductive isolation, since the species that have been collected parapatrically in various areas, such as M. longipennis and M. picturatus (Martínez-Ibarra et al 2001, 2008, Magallón-Gastélum 2006, M. pallidipennis and M. longipennis, and M. pallidipennis and M. picturatus, presented lower degrees of reproductive isolation (Martínez-Ibarra et al 2005).…”

Biological and genetic aspects of crosses between species of the genus Meccus (Hemiptera: Reduviidae Triatominae)

“…However, "subspecies are local populations that are recognisably different from each other but they are nevertheless considered to belong to the same species, because they are observed to interbreed in nature or because it is inferred that they are likely to interbreed" (Mayr & Diamond 2001). In accordance with these species and subspecies concepts and in light of some previously published reports (Flores et al 2001, Martínez et al 2005, Takashi-Obara et al 2007, Bargues et al 2008, the biological evidence reported here supports the proposition that it is more appropriate to attribute a subspecies level to M. bassolsae, as has been proposed for M. pallidipen nis, M. longipennis and M. picturatus (Martínez-Ibarra et al 2008b). However, the same biological evidence supports the proposal that M. phyllosomus is a full spe cies, as some recent molecular studies have proposed (Sainz et al 2004, Pfeiler et al 2006.…”