Shifting clinal patterns of stress resistance traits in Drosophila ananassae

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• 作者：Jyoti Chahal (1)
  Kapil Dev (1)
  
• 关键词：Total body color dimorphism ; Melanisation stripes ; Seasons ; Clines ; Stress resistance
• 刊名：Evolutionary Ecology
• 出版年：2013
• 出版时间：March 2013
• 年：2013
• 卷：27
• 期：2
• 页码：333-351
• 全文大小：606KB
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• 作者单位：Jyoti Chahal (1)
  Kapil Dev (1)
  
  1. Department of Genetics, Maharshi Dayanand University, Rohtak, 124001, India
  
• ISSN：1573-8477

文摘

Drosophila ananassae, a desiccation and cold sensitive species, is abundant along the latitudinal gradient of the Indian subcontinent. Analysis of seasonally varying wild-caught flies showed two independent patterns of melanisation: (1) narrow to broad melanic stripes on three anterior abdominal segments only; (2) a novel body color pattern (dark vs. light background). We investigated the degree to which these two melanisation systems vary; first with latitude and secondly among seasons. There is a shallow latitudinal cline for percent striped melanisation as well as for frequency of body color alleles during the rainy season. The frequencies of body color alleles vary significantly across seasons in the northern populations i.e. the light allele occur abundantly (>0.94) during the rainy season while the frequency of the dark allele increases (0.22-.35) during the dry season causing steeper clines during the dry season. By contrast, the low variations in abdominal stripes showed non-significant changes and the cline was similar across seasons. Furthermore, both types of melanisation patterns showed no plasticity with respect to temperature. The present study also investigated clines related to desiccation, heat and cold stress in D. ananassae females across seasons (rainy and dry) from nine latitudinal populations. The clines for stress related traits changes to steeper and non-linear during the dry season. Thus, latitudinal populations of D. ananassae differ in slope values of clines for stress related traits across seasons. This study reports seasonal changes in latitudinal clines of stress resistance traits as seen in a changing frequency of body color alleles of D. ananassae in northern locality, while in southern localities it remains constant. This is presumably the result of only minor seasonal changes in humidity and temperature in the South, whereas in the North seasonal climatic variability is much higher.