Growth temperature and reaction norms of morphometrical traits in a tropical drosophilid: Zaprionus indianus. Heredity (Edinb) 1999 Oct;83 ( Pt 4):398-407
Date
12/03/1999Pubmed ID
10583541DOI
10.1038/sj.hdy.6885940Scopus ID
2-s2.0-0032755816 (requires institutional sign-in at Scopus site) 43 CitationsAbstract
Ten isofemale lines of Zaprionus indianus were analysed to study the reaction norms of five morphometrical traits (wing and thorax length, body weight, sternopleural bristle and ovariole number) in relation to growth temperature. All these traits exhibited nonlinear concave reaction norms and were characterized by the coordinates of their maximum: MV (maximum value), and TMV (temperature of maximum value). Wing/thorax ratio, which is related to flight capacity, was also calculated and exhibited a monotonically decreasing reaction norm. Intraclass correlations were on average quite low, with no significant differences between traits, temperature or sex; a highly significant trait-temperature interaction was, however, observed. Sex dimorphism was very low in Zaprionus, contrasting with data previously obtained in other species. MVs among lines were positively correlated for the three size-related traits, whereas sternopleural bristle and ovariole number were genetically independent. TMVs were different between the traits, but higher than in D. melanogaster and other cold-adapted species, in agreement with the hypothesis that the norm shape evolves according to species thermal adaptation. MVs and TMVs were never correlated, indicating that mean values and plasticity are genetically independent. Some positive correlations were observed among TMVs of different traits, suggesting that the same genetic system might regulate plasticity of different traits.
Author List
Karan D, Moreteau B, David JRAuthor
Dev Karan PhD Associate Professor in the Pathology department at Medical College of WisconsinMESH terms used to index this publication - Major topics in bold
AnimalsBody Constitution
Data Interpretation, Statistical
Drosophilidae
Female
Genetic Variation
Male
Phenotype
Sex Characteristics
Temperature
