Speciation through sensory drive in cichlid fish
This work identifies the ecological and molecular basis of divergent evolution in the cichlid visual system, demonstrates associated divergence in male colouration and female preferences, and shows subsequent differentiation at neutral loci, indicating reproductive isolation.
Evidence for recent positive selection at the human AIM1 locus in a European population.
The results suggest that positive selection recently has been acting or has acted on at least this region of the melanogenic gene and that an advantageous haplotype spread rapidly in Europe.
DNA variation in a conifer, Cryptomeria japonica (Cupressaceae sensu lato).
The frequency spectrum of the nucleotide polymorphism revealed excesses of intermediate-frequency variants, which suggests that the population was not panmictic and a constant size in the past, and suggested possibilities of natural selection acting at some of the loci.
Divergent Selection on Opsins Drives Incipient Speciation in Lake Victoria Cichlids
Parallel evolution in two cichlid genera under strong divergent selection in a gene that affects both is demonstrated, showing that the reciprocal fixation adapts populations to divergent light environments.
Phylogeny of PgiC gene in Shorea and its closely related genera (Dipterocarpaceae), the dominant trees in Southeast Asian tropical rain forests.
Partial sequences of the PgiC gene from species of Shorea, Hopea, Neobalanocarpus, and Parashorea were determined to elucidate phylogenetic relationships among the species of these genera and generated a gene tree with better resolution than previous cpDNA trees.
A study on a nearly neutral mutation model in finite populations.
- H. Tachida
- 1 May 1991
As a nearly neutral mutation model, the house-of-cards model is studied in finite populations using computer simulations and it is found that deviation from the neutral expectation becomes apparent only when 4N sigma is more than two.
Molecular phylogeny of Dipetrocarpaceae in Southeast Asia based on nucleotide sequences of matK, trnL intron, and trnL-trnF intergenic spacer region in chloroplast DNA.
This result suggests that the chromosome number changed from x = 11 to x = 7 after Dipterocarpus branched in the latter cluster, and other evolutionary changes of morphological characters are also discussed.
Phylogenetic relationships in Taxodiaceae and Cupressaceae sensu stricto based on matK gene, chlL gene, trnL-trnF IGS region, and trnL intron sequences.
- J. Kusumi, Y. Tsumura, H. Yoshimaru, H. Tachida
- BiologyAmerican-Eurasian journal of botany
- 1 October 2000
Results indicate that Taiwania diverged first, and then Athrotaxis diverged from the remaining genera, and found acceleration of evolutionary rates in Cupressaceae s.s. in accordance with previous morphological groupings and the analyses of molecular data.
Molecular Evolution in a Multisite Nearly Neutral Mutation Model
- H. Tachida
- BiologyJournal of Molecular Evolution
The house-of-cards model was investigated and its behavior was shown to be more sensitive to changes of population size than that of the independent multicodon model, and the relevance of the present model for explaining protein evolution was discussed comparing its prediction and recent DNA data.
Understanding and monitoring the consequences of human impacts on intraspecific variation
It is argued for the need for local, regional, and global programs to monitor intraspecific genetic variation and it is suggested that such monitoring should include two main strategies: intensive monitoring of multiple types of genetic variation in selected species and broad‐brush modeling for representative species for predicting changes in variation as a function of changes in population size and range extent.