| early events in speciation: cryptic species of drosophila aldrichi. | understanding the earliest events in speciation remains a major challenge in evolutionary biology. thus identifying species whose populations are beginning to diverge can provide useful systems to study the process of speciation. drosophila aldrichi, a cactophilic fruit fly species with a broad distribution in north america, has long been assumed to be a single species owing to its morphological uniformity. while previous reports either of genetic divergence or reproductive isolation among diffe ... | 2017 | 28649335 |
| the phenotypic variance gradient - a novel concept. | evolutionary ecologists commonly use reaction norms, which show the range of phenotypes produced by a set of genotypes exposed to different environments, to quantify the degree of phenotypic variance and the magnitude of plasticity of morphometric and life-history traits. significant differences among the values of the slopes of the reaction norms are interpreted as significant differences in phenotypic plasticity, whereas significant differences among phenotypic variances (variance or coefficie ... | 2014 | 25540685 |
| a biophysical interpretation of temperature-dependent body size in drosophila aldrichi and d. buzzatii. | the temperature-size rule, the observation that most ectotherms grow faster but reach smaller size at higher temperatures, has defied a general explanation. here, the temperature-size rule in drosophila aldrichi and drosophila buzzatii is investigated, using data on development rate and adult dry weight at nine temperatures. in both species the linear regression of dry weight on temperature is negative. the data are used to infer the potential for a description of temperature dependent size by b ... | 2010 | 28799917 |
| variation in body size and life history traits in drosophila aldrichi and d. buzzatii from a latitudinal cline in eastern australia. | latitudinal variation in thorax and wing size traits was studied in wild-caught flies of the cactophilic drosophila species, d. aldrichi and d. buzzatii, and their laboratory-reared progeny. the flies originated from five populations in queensland, australia, spanning an 800-km transect. the laboratory flies were reared at controlled densities and three temperatures, 20, 25, and 30 degrees c. we measured the same traits for the laboratory-reared flies as for the wild-caught flies, plus developme ... | 2000 | 11122420 |
| coexistence of ecologically similar colonising species iii. drosophila aldrichi and d. buzzatii: larval performance on, and adult preference for, three opuntia cactus species. | two drosophila species, d. buzzatti and d. aldrichi, coexist on several species of opuntia cacti in australia, primarily on o. tomentosa and o. streptacantha in the northern part of the cactus distribution, and on o. stricta in the south. thorax length of field-collected adults was less, and the variance in length greater, than that for flies reared on simulated rots in the laboratory, indicating that these species are affected by crowding in nature. a larval performance index, measured on simul ... | 1992 | 28312602 |