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      Morphological Variation among 23 Xiphinema americanum Populations.

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          Abstract

          Morphometrics of 23 United States populations of Xiphinema americanum sensu lato, sharing the characteristics of an offset lip region and conoid tail, were examined and analyzed statistically by canonical discriminant analysis (CDA). Specimens were collected from Arkansas, Georgia, Tennessee, Mississippi, Florida, Oklahoma, California, and North Dakota. Eleven measurements and body ratios obtained from female specimens were used in the analysis. Xiphinema americanum, X. bricolensis, X. californicum, X. citricolum, X, intermedium, X. tarjanense, and X. thornei, and one undescribed species were identified among the 23 populations. Three groups -- X. americanum-group, X. californicum-group, and X. intermedium-group (X. intermedium and X. tarjanense) -- were formed and four populations belonging to four different species were separated consistently from these groups in CDA scatterplots of the 23 populations. Composition of the groups was somewhat related to the geographical origins of the populations in the groups. A population from California had morphometrics intermediate between X. americanum and X. californicum. Separation between the X. americanum-group and X. californicum-group in the CDA scatterplots was not as distinct as that between them and the X. intermedium-group or between any of the three groups and the four single outlying populations.

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          Author and article information

          Journal
          J. Nematol.
          Journal of nematology
          0022-300X
          0022-300X
          Jan 1991
          : 23
          : 1
          Article
          2619132
          19283103
          03356c73-77a6-42ff-8b03-1c5c55aa2ae5
          History

          X. bricolensis,X. californicum,X. citricolum,X. intermedium,X. tarjanense,X. thornei,Xiphinema americanum,canonical discriminant analysis,morphology,morphometrics

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