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Statistical analysis of variation in characters in Tetrastemma laminariae (Nemertini), with a redescription of the species
Author(s) -
Sundberg Per
Publication year - 1979
Publication title -
journal of zoology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.915
H-Index - 96
eISSN - 1469-7998
pISSN - 0952-8369
DOI - 10.1111/j.1469-7998.1979.tb03952.x
Subject(s) - biology , variation (astronomy) , coefficient of variation , stylet , population , zoology , fixation (population genetics) , range (aeronautics) , statistics , evolutionary biology , anatomy , mathematics , genetics , demography , physics , materials science , sociology , astrophysics , gene , composite material
Variation in taxonomic characters from Tetrastemma laminariae (Hoplonemertini, Nemertini) was analysed by, and expressed in, different types of statistics (coefficient of variation, range, coefficient of residual variation and variance of logarithms). Variance based on log‐transformed values makes it possible to test differences in variation between populations. The variation was high in most characters, probably owing to artifacts, especially contraction on fixation. Because of this the species have to be diagnosed by many characters, properly stated not only by their mean values but also by their variation. The number of accessory stylets in a starved population was tested and found significantly ( P =005) higher than in a freshly sampled population. There was no difference between these two populations in the length of the main stylet.