Harry M
Unité d'Ecopathologie, Institut National de la Recherche Agronomique, La Minière, Guyancourt, France.
Jpn J Genet. 1994 Jun;69(3):233-50. doi: 10.1266/jjg.69.233.
Morphometric variability was studied in six domestic Venezuelan populations of the blood-sucking bug Rhodnius prolixus Stal 1897 (Reduviidae, Triatominae) and in a sylvatic population identified as R. robustus Larrousse 1927. Evidence is here provided by both uni- and multifactorial analyses of extensive variation of morphological traits between the R. prolixus populations studied. Regardless the geographic or climatic environmental factor tested, none can be retained in a selective model accounting for the morphological variability observed. Moreover, the results failed to support any correlation between the morphological Mahalanobis' distances and geographical distances. The genetic relationships between these populations inferred from the present data, are more consistent with some demic structure, resulting from random genetic drift by founder effects, than with any alternative population genetic model. It is noteworthy that the range of variation of these morphological traits in R. prolixus includes the putative R. robustus population. Therefore, the species-specific status of R. robustus, at the very least the local Trujillo population studied, is questioned. In addition, a preliminary multifactorial analysis bearing on the three other Rhodnius relatives, R. pictipes Stal 1872, R. nasutus Stal 1859 and R. neglectus Lent 1954, confirmed the marked morphological differentiation of R. pictipes from all other species and showed a clear morphological differentiation of R. nasutus and R. neglectus both from one another and from R. prolixus.
对委内瑞拉的六个家栖吸血猎蝽种群（1897年的红带锥蝽，Rhodnius prolixus Stal，猎蝽科，锥蝽亚科）以及一个被鉴定为1927年的粗壮锥蝽（R. robustus Larrousse）的野生种群进行了形态测量变异研究。通过对所研究的红带锥蝽种群之间形态特征广泛变异的单因素和多因素分析，提供了相关证据。无论测试何种地理或气候环境因素，在解释所观察到的形态变异的选择模型中，都无法保留任何一个因素。此外，结果未能支持形态马氏距离与地理距离之间的任何相关性。从目前数据推断出的这些种群之间的遗传关系，与由奠基者效应导致的随机遗传漂变所产生的一些半隔离结构更为一致，而不是与任何其他替代的种群遗传模型一致。值得注意的是，红带锥蝽这些形态特征的变异范围包括假定的粗壮锥蝽种群。因此，粗壮锥蝽的物种特异性地位，至少在所研究的特鲁希略当地种群方面受到质疑。此外，对其他三种锥蝽亲属，即1872年的花斑锥蝽（R. pictipes Stal）、1859年的鼻锥蝽（R. nasutus Stal）和1954年的疏忽锥蝽（R. neglectus Lent）进行的初步多因素分析，证实了花斑锥蝽与所有其他物种之间明显的形态分化，并表明鼻锥蝽和疏忽锥蝽彼此之间以及与红带锥蝽之间都存在明显的形态分化。
