Showing papers by "Roger K. Butlin published in 1984"
TL;DR: The seaweed fly, Coelopa frigida, is polymorphic for two gene arrangements on chromosome I, and the egg to adult viability of heterokaryotypes is higher than either homokaryotype.
Abstract: The seaweed fly, Coelopa frigida, is polymorphic for two gene arrangements on chromosome I. Inversion frequencies in natural populations are very stable, both geographically and temporally and there is a consistent excess of heterokary-otypes. Laboratory experiments are reported which demonstrate that the egg to adult viability of heterokaryotypes is higher than either homokaryotype. This advantage increases markedly with larval density. Field samples also show a strong correlation between larval density and relative viability, expressed as the excess of heterokaryotypes over Hardy-Weinberg expectations. Larvae of a closely related species, C. pilipes contribute significantly to this density effect in natural populations.
36 citations
TL;DR: The relationship between development time and size suggests that both these characters are involved in control of the onset of pupation and differences in relative viability between the karyotypes are not related to the development time or size differences.
Abstract: The effect of larval competition on adult size and egg to adult development time has been investigated in laboratory populations of the seaweed fly, Coelopa frigida. Increased larval density results in longer development times and smaller adults, suggesting a strong interference element to the competition. This may be due to a limiting rate of food supply rather than interactions between larvae. The relationship between development time and size suggests that both these characters are involved in control of the onset of pupation. C. frigida is polymorphic for an inversion on chromosome I. Differences in relative viability between the karyotypes are not related to the development time or size differences.
29 citations
3 citations