Ecological Genetics

The inheritance of pheromone production in the sulphur butterflies Colias eurytheme and C. Philodice

“…As a result, fixation of adaptive or elimination of maladaptive allelic combinations is more rapid for X-linked loci than for autosomal loci and co-adaptation is promoted. In addition, co-adapted gene complexes which are located on the sex chromosomes may also acquire at least partial protection from decay through recombination because the heteromorphic nature of this pair of chromosomes in the heterogametic sex reduces crossingover (Ford, 1975). However, this mechanism would not be important in.…”

Studies on phenotypic variation in Maniola jurtina (Lepidoptera: Satyridae) in the wyre forest, England

“…Considering the males first, there is no sign of variation in low-spotted individuals. However, two-spotted males decreased noticeably over the and " English " stabilisations (Ford, 1975). Within the " spotted category, there is some evidence of an increase in the frequency of onespotted butterflies; while this is not formally significant (r = +0.776, P = 0.10), it does, however, mirror the regular changes observed among males.…”

“…This protracted flying period seems to reflect a very variable larval growth rate (Ford, 1975). The food plants of the larvae are grasses, particularly Poa pratense, and the species is especially abundant in rough, uncut grassland.…”

“…It behaves as a genetic character with a heritability at a rearing temperature 91 of 15°C of 14 per cent in the males and 64 per cent in the females (McWhirter, 1969). Ford (1975) reports that higher values of 47 per cent and 78 per cent were obtained at 22°C.…”

“…The earlier studies on spot number in this species have been extensively reviewed by Ford (1975). They fall into three broad sections.…”