Morphometric study on twelve populations of Nacobbus aberrans (Thorne, 1935) Thorne & Allen, 1944 (Nematoda: Pratylenchidae) from Mexico and South America
Authors: Manzanilla-Lopez, Rosa H.; Harding, Simon; Evans, Ken
Source: Nematology, Volume 1, Number 5, 1999 , pp. 477-498(22)
Publisher: BRILL
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Abstract:
Twelve populations of Nacobbus aberrans from Mexico and South America were cultured in the glasshouse on tomato plants. Second stage juveniles, males, young females and mature females were recovered from the cultures and studied using light microscopy. Morphometric data were analysed using canonical variate analysis. Many of the characters previously used to establish species or subspecific ranks were shown to be variable and all variants occurred in all populations studied, even if at low frequencies. Etude morphometrique de douze populations de Nacobbus aberrans (Thorne, 1935) Thorne & Allen, 1944 (Nematoda: Pratylenchidae) du Mexique et d'Amerique du Sud - Douze populations de Nacobbus aberrans du Mexique et d'Amerique du Sud ont ete elevees en serre sur plants de tomate. Les juveniles de deuxieme stade, les males, les femelles jeunes et les femelles matures ont ete recoltes a partir de ces elevages et etudies en microscopie photonique. Les donnees morphometriques ont ete analysees par analyse canonique. De nombreux caracteres precedemment utilises aux niveaux specifique ou subspecifique sont apparus variables, tous les variants etant presents dans toutes les populations etudiees, a des frequences parfois faibles mais jamais nulles.
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