Observations on intertidal organism associations of St. Catherines Island, Georgia. 1, General description and paleoecological implications. Bulletin of the AMNH ; v. 159, article 3

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dc.contributor.author Morris, Robert W. (Robert William), 1941- en_US
dc.contributor.author Rollins, Harold B., 1939- en_US
dc.date.accessioned 2005-10-06T14:38:26Z
dc.date.available 2005-10-06T14:38:26Z
dc.date.issued 1977 en_US
dc.identifier.uri http://hdl.handle.net/2246/928
dc.description p. 89-128 : ill., maps ; 26 cm. en_US
dc.description Includes bibliographical references (p. 127-128). en_US
dc.description.abstract "Intertidal environments of St. Catherines Island, Georgia are diverse and include exposed sand beaches, sandy tidal flats, relict salt marsh deposits (mud and peat) on exposed beaches, and salt marsh complexes. Nine localities from the northern half of St. Catherines Island were selected for study because they displayed a wide variety of intertidal habitats and organism associations. No attempt was made to describe the entire spectrum of intertidal associations on St. Catherines Island. The bulk of study was made on the relict salt marsh deposits. Besides representing unique modern habitats for infaunal and epifaunal bivalve-dominated associations, the salt marsh deposits gave us valuable paleoecological insights. The organism groupings recognized in the present study are associations in the sense of Kauffman and Scott (1976), but communities in the usage of most workers. One relict mud occurrence contained an assemblage of six distinct associations. The fidelity of replication of these associations in the fossil record depends, in part, upon the steepness of the intertidal environmental stress gradients and the resultant spatial and temporal environmental heterogeneity. The infaunal bivalves of the relict muds showed expected trends of size distribution with depth, the larger individuals occupying the greater depths. It is suggested that the lateral transportation of dislodged mud clasts has an analog in the geological past in the occurrence of 'exotic' fossiliferous pods and steinkerns. Association boundaries were sharp only where spatial heterogeneity was pronounced, such as within salt marsh complexes. The polychaete associations along sandy tidal flats were less clearly bounded and were often marginally intergradational. Many observations on the intertidal associations of St. Catherines Island were in disagreement with observations made on similar associations elsewhere. Contrary to the conclusions of Woodin (1976), dense infaunal bivalve populations (Petricola pholadiformis) did coexist with dense epifaunal bivalve populations (Brachidontes recurvus). Also, repeated observations of dense tube-building polychaete populations failed to show epifaunal bivalves as predominant co-occurring forms. Polychaete associations along a narrow tidal flat displayed onshore-offshore distributional trends that may have paleoecological utility in the resolution of transgression-regression sequences. Tidal creek populations of Ilynassa obsoleta have a narrower aperture relative to total height than similar populations from more open sand flats. It is suggested that this is correlated with the greater duration of intertidal exposure in the tidal creek habitat. Study of another intertidal snail, Littorina irrorata, demonstrated considerable lateral as well as vertical motility in that species"--P. 89. en_US
dc.format.extent 20448900 bytes
dc.format.mimetype application/pdf
dc.language eng en_US
dc.language.iso en_US
dc.publisher New York : American Museum of Natural History en_US
dc.relation.ispartofseries Bulletin of the American Museum of Natural History ; v. 159, article 3 en_US
dc.subject.lcc QH1 .A4 vol.159, art.3, 1977 en_US
dc.subject.lcsh Intertidal animals -- Georgia -- Saint Catherines Island. en_US
dc.subject.lcsh Seashore ecology -- Georgia -- Saint Catherines Island. en_US
dc.subject.lcsh Paleoecology -- Georgia -- Saint Catherines Island. en_US
dc.title Observations on intertidal organism associations of St. Catherines Island, Georgia. 1, General description and paleoecological implications. Bulletin of the AMNH ; v. 159, article 3 en_US
dc.title.alternative General description and paleoecological implications en_US
dc.title.alternative Intertidal organisms en_US
dc.type text en_US

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  • Bulletin of the American Museum of Natural History
    The Bulletin, published continuously since 1881, consists of longer monographic volumes in the field of natural sciences relating to zoology, paleontology, and geology. Current numbers are published at irregular intervals. The Bulletin was originally a place to publish short papers, while longer works appeared in the Memoirs. However, in the 1920s, the Memoirs ceased and the Bulletin series began publishing longer papers. A new series, the Novitates , published short papers describing new forms.

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