Article

Evolutionary Discontinuity of the Carabine Ground Beetles

Journal of Molecular Evolution (Impact Factor: 1.86). 01/2001; 53(4):517-529. DOI: 10.1007/s002390010242
Source: PubMed

ABSTRACT The Carabine ground beetles are mostly hind wing-less and cannot fly, so that there is more chance of diversification by
geographic isolation compared with winged insects. The relationships between morphological diversification and phylogeny of
the ground beetles of the world have been inferred mainly by comparisons of mitochondrial ND5 gene sequences. Based on dating
by a mitochondrial DNA ``clock,'' it has been deduced that an explosive radiation of the major carabine groups took place
50–40 MYA. This was followed by occasional radiations on various scales, sometimes accompanied by parallel morphological changes.
There are also a good number of examples showing that the fundamental morphology has remained unchanged for a long time among
geographically isolated populations within the same species. Thus, carabid evolution would have proceeded discontinuously,
with phases of rapid morphological change alternating with silent phases.

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Available from: Zhi-Hui Su, Sep 16, 2014
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    • "DNA 1 mL using primer made according to the existing report (Table 2; Su et al. 2001). The PCR conditions were set as follows: going through a metamorphic process at 94 C for 2 minutes , 48 C for 15 seconds, and then 72 C for 45 secondsdthis process was defined as one reaction cycle and was repeated 35 times in total. "
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    • "The ND5 gene sequences were AT-rich (around 80%) and their G+C contents were nearly constant (21 T 2%). These facts, together with linearity between the chronology and evolutionary distances in the carabid beetles (see Fig. 1 of Su et al., 2001), suggest that the DNA clock has been working at a nearly constant rate, without any appreciable influence of base composition bias or multiple substitutions. "
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