Inversion polymorphism in a Connecticut RiverAxarusspecies (Diptera: Chironomidae): biometric effects of a triple inversion heterozygote

Autor:	Ed Klekowski, Sean F. Werle, Douglas G. Smith
Rok vydání:	2004
Předmět:	Larva Polytene chromosome biology Ecology Population genetics Zoology Axarus Cline (biology) biology.organism_classification Chironomidae Midge Animal Science and Zoology Ecology Evolution Behavior and Systematics Chromosomal inversion
Zdroj:	Canadian Journal of Zoology. 82:118-129
ISSN:	1480-3283 0008-4301
DOI:	10.1139/z03-227
Popis:	The authors sampled three spatially isolated populations of a chironomid midge in the genus Axarus living in the Connecticut River both early and late in the larval life cycle of one generation. Larvae were scored for both length and inversion frequency using the polytene chromosomes from salivary gland cells. We found polymorphism for four paracentric inversions. Inversion C1–6exhibits a geographic cline, increasing in frequency with increasing latitude but remaining stable over time. Also stable over time were two other paracentric inversions designated A1–5and F13–20, which were present at similar frequencies in all populations. None of these inversions was associated with larval length. A complex triple inversion designated G2–7was significantly correlated with decreased larval length and also exhibited a significant increase in frequency (within one cohort) in the two more northerly populations. We propose that this increase is due to size-selective predation eliminating larger larvae.
Databáze:	OpenAIRE
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