Mateus R P, Sene F M
Departmento de Genética, Bloco A, Faculdade de Medicina de Ribeirão Preto/Universidade de São Paulo, Av. Bandeirantes, 3900, Ribeirão Preto, SP, Brazil.
Biochem Genet. 2003 Aug;41(7-8):219-33. doi: 10.1023/a:1025506301239.
Drosophila antonietae is an endemic South American cactophilic species that uses Cereus hildmaniannus rotting cladodes as breeding sites. We assessed temporal and spatial intrapopulational allozyme variation of two natural populations. Our results suggest that environmental variation (rain precipitation) is probably influencing allozyme temporal variation. Moreover, it seems that D. antonietae does not have intrapopulation structure and has N(ev) (variance effective size) approximately equal to 83 and N(ec) (number of adult flies that colonize each rotting cladode) = 21. The deficiency of heterozygotes found must be due to null alleles, a temporal Wahlund effect, or selection against heterozygotes. Assortative mating and inbreeding are discarded. This is the first report on allozyme variation in D. antonietae. It gives some insight on intrapopulational genetics through space and time for this species. This is important to understand its general genetic variability and will be essential to future works on the natural history and evolution of this species.
安东尼奥果蝇是一种南美洲特有的喜仙人掌物种，它利用希尔德曼仙人柱腐烂的茎节作为繁殖场所。我们评估了两个自然种群的种群内等位酶的时间和空间变异。我们的结果表明，环境变异（降雨）可能影响等位酶的时间变异。此外，安东尼奥果蝇似乎没有种群内结构，其有效方差大小N(ev)约等于83，而定植于每个腐烂茎节的成年果蝇数量N(ec)=21。发现的杂合子不足一定是由于无效等位基因、时间上的瓦伦德效应或对杂合子的选择。选型交配和近亲繁殖被排除。这是关于安东尼奥果蝇等位酶变异的首次报道。它为该物种在空间和时间上的种群内遗传学提供了一些见解。这对于理解其总体遗传变异性很重要，并且对于该物种自然历史和进化的未来研究至关重要。
