THE DISTRIBUTION OF EDAPHIC DIATOMS ALONG ENVIRONMENTAL GRADIENTS OF A LOUISIANA SALT MARSH1
作者:
Lawrence L. Cook,
Stephen A. Whipple,
期刊:
Journal of Phycology
(WILEY Available online 1982)
卷期:
Volume 18,
issue 1
页码: 64-71
ISSN:0022-3646
年代: 1982
DOI:10.1111/j.1529-8817.1982.tb03157.x
出版商: Blackwell Publishing Ltd
关键词: edaphic diatoms;environmental gradients;salt marsh;Louisiana;diversity;community structure
数据来源: WILEY
摘要:
ABSTRACTEdaphic (sediment‐associated) diatoms were collected from five sites along a gradient from slightly brackish to saline marsh on 30 November 1977 and 29 April 1978. Several environmental factors change along this gradient in addition to salinity, including tidal flushing and percent organic content of the soil. A total of 112 taxa were identified, withAmphora exiguaGreg.,Navicula phylleptaKütz.,N. salinarumGrun., andN. tripunctata(Müll.) Bory being among the five most abundant taxa on both sampling dates. The taxonomic composition of the diatom flora was very similar to those observed for other salt marshes located along the Gulf and Atlantic coasts. Diatom taxa were generally euryhaline and distributed continuously along the gradient from brackish to saline marsh. Species diversity (H1) and the number of taxa in a sample (S) were also similar to those reported for other North American salt marshes. The number of taxa in a sample was higher in the saline than in the brackish area on both sampling dates while species diversity was greater in the saline area only in Ap
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