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MORPHOLOGICAL VARIATION OF ACHNANTHES HAUCKIANA (BACILLARIOPYCEAE) IN THE RIELD 1
Author(s) -
Tropper Caroline B.
Publication year - 1975
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1111/j.1529-8817.1975.tb02782.x
Subject(s) - biology , variation (astronomy) , astrophysics , physics
SUMMARY Samples of 2 populations of the diatom, Achnanthes hauckiana Grun., collected from Sippewissett Marsh, Massachusetts, were measured. Regression analyses of the measurements were calculated. The length/width ratio of both samples decreased almost linearly with decreasing length. The length/width ratio of the rostrate ends also decreased almost linearly with decreasing length. The number of striae per 10 μm showed a slight tendency to increase with decreasing length. Some of the specimens collected, which fit the descriptions of A. hauckiana var. elliptica or ver. rostrata, appear to be morphological variants of the nominate variety. The change in shape with size fits Geitler's rule of proportionally greater decrease in the apical axis than the decrease in the transapical axis. The regression lines of change in shape with size might be used as taxonomic characteristics and contain more information than the usual descriptions of limits of size and shape of a species.