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- W2312449231 abstract "Chromosomal variation in the Moreton subspecies of the Australian grasshopper, Caledia captiva (F.), involves the transposition of the centromere from terminal to medial locations on all chromosomes within the genome (2n = 23 6 /24 Y). At each end of its distributional range - covering 1500 km along the east coast of Australia - populations show fixed differences in chromosome structure. Between these two extremes, populations are characterized by complex chromosomal polymorphisms that take the form of latitudinal clines along which the entire genome changes gradually and systemically from metacentric in northern populations to acro/telocentric in the south. To date over 600 different chromosomal rearrangements have been identified. Using a series of DNA and protein markers, we have shown that gene flow along the chromosomal clines is continuous, suggesting that the establishment and maintenance of the clines has involved selective rather than stochastic events. Moreover, we have also revealed that the concerted patterns of chromosome change are correlated with changes in development time. Development time is negatively correlated with changes in the number of degree days available for successful completion of the life cycle with increasing latitude and probably represents an adaptation to the gradual reduction in season length. Increased body weight is also correlated with acro/telocentric chromosomes and with a rapid development time. An explanation of this unusual relationship is presented, whereby it is proposed that the changes in the location of the centromeres on every chromosome lead to changes in nuclear volume by modifying the centromere-telomere disposition at telophase when the nuclear envelope is reassembled. This proposal is analogous to the known consequences of increasing nuclear DNA content which leads to larger nuclear volume, larger cell and body size, and reduced generation time." @default.
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- W2312449231 date "1998-12-01" @default.
- W2312449231 modified "2023-09-26" @default.
- W2312449231 title "Concerted Patterns of Chromosome Variation in the Grasshopper Caledia captiva (F.) (Orthoptera: Acrididae: Acridinae): An Adaptive Response to Seasonality Changes along a Latitudinal Gradient?" @default.
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- W2312449231 doi "https://doi.org/10.2307/3503514" @default.
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