Fierstien IV J.F. Alii, 1987 Observations on Intertidal Organism Associations of St. Catherines Island, Georgia. II. Morphology and Distribution of Littorina irrorata. American Mus. Novit., 2873 CCXXVII英文电子书.pdfVIP

AMERICAN MUSEUM Novitates PUBLISHED BY THE AMERICAN MUSEUM OF NATURAL HISTORY CENTRAL PARK WEST AT 79TH STREET, NEW YORK, N.Y. 10024 Number 2873, pp. 1-3 1, figs. 1-16, tables 1-6 April 8, 1987 Observations on Intertidal Organism Associations of St. Catherines Island, Georgia. II. Morphology and Distribution of Littorina irrorata (Say) JOHN F. FIERSTIEN IV1 AND HAROLD B. ROLLINS2 ABSTRACT The marsh periwinkle Littorina irrorata (Say) aperture angle, and total width. Larger apertural occurs in a variety of Spartina marsh settings on area was correlated with low marsh environments St. Catherines Island, Georgia. Cohorts of L. ir- (wetter conditions). Total width of L. irrorata rorata were collected at four marsh localities and proved to be a better indicator ofpopulation struc- control grids were monitored over a three-week ture than total height and should be used in the period. In addition, a fossil population was col- construction ofsurvivorship curves for this species. lected from a relict marsh mud. Each sample was The fossil population sample apparently reflects subjected to detailed morphometric analysis using substantially different growth dynamics, achieving univariate, bivariate, and multivariate techniques. adult size at fewer than six whorls. Adult size of L. irrorata is inversely related to L. irrorata is a potentially useful tool for pa- population density and density, in turn, is directly leoenvironmental reconstructions. The species ap- proportional to the abundance of Spartina grass. pears to exhibit limited lateral motility and has a Progenesis appears to be the adapt