Bitner-Mathé B C, Peixoto A A, Klaczko L B
Departamento de Genética, Universidade Federal do Rio de Janeiro, Brazil.
Heredity (Edinb). 1995 Jul;75 ( Pt 1):54-61. doi: 10.1038/hdy.1995.103.
To characterize the morphological variation in a natural population of Drosophila mediopunctata, males were collected on three occasions at a single locality. From each wild-caught male 14 body measures were taken and the karyotype for inversions on chromosomes X and II was determined. Through a principal components analysis, two sources of variation, identified as size and shape, accounted for approximately 80 and 6 per cent of the total morphological variability, respectively. The shape component was determined primarily by variations in the position of the wing second longitudinal vein. Differences between collections were detected both for size and shape. An altitudinal cline was observed in respect of wing shape, although altitude explained only a small part of the shape variation. Size and shape were affected by chromosome II inversions. However, in respect of size, no direct differences were detected between karyotypes but a significant interaction between collecting date and karyotype was found. This suggests that karyotypes might differ in their norms of reaction in the field.
为了描述果蝇自然种群中的形态变异，在一个地点分三次采集雄性果蝇。对每只野生捕获的雄性果蝇进行了14项身体测量，并确定了X和II号染色体上倒位的核型。通过主成分分析，确定了两个变异来源，即大小和形状，分别占总形态变异的约80%和6%。形状成分主要由翅第二纵脉的位置变化决定。在大小和形状方面都检测到了不同采集批次之间的差异。在翅形方面观察到了海拔梯度变化，尽管海拔仅解释了形状变异的一小部分。大小和形状受到II号染色体倒位的影响。然而，在大小方面，未检测到核型之间的直接差异，但发现采集日期与核型之间存在显著的相互作用。这表明核型在野外的反应规范可能存在差异。
