Sampling Macroinvertebrates On High Energy Sand Beaches

Author : Walter G. Nelson
Publisher :
ISBN 13 :
Total Pages : 74 pages
Book Rating : 4.:/5 (359 download)

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Download or read book Physical and Biological Guidelines for Beach Restoration Projects written by Walter G. Nelson and published by . This book was released on 1985 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: Several studies have been undertaken to describe the sand beach fauna, which have been divided into 3 zones, although terminology has varied. There have been reported striking similarities in the types of organisms inhabiting sandy beaches in various locations. The degree of wave exposure, as well as the environment of the beach and the coarseness of the sand appear to be major factors controlling the diversity of sand beach communities. The biology of selected organisms includes Emerita talpoida (mole crabs), Domax spp. (coquina clams), Haustoriid Amphipods, Surf zone fishes, Ocyzpode quadrata (ghost crab), Polychaetes and Sea turtles. Most of the studies reported little or no long term adverse effects of beach nourishment. The effects of beach nourishment were reported similar to the effects of storm events. Experimental sediment burial studies were carried out on the intertidal organisms, with the results shown in Table VIII. The results were dependent upon the coarseness and depth of the sediment. Recommendations included: A general review of data on the effects of beach nourishment on sand beach macrofauna suggests that minimal biological effects result. Some mortality of organisms may occur when grain size is a poor match to existing sediments; recovery of the beach system appears to be rapid. Turtle nesting may be negatively affected due to sand compaction for about one year. Further biological monitoring should be continued until more data is available. Nourishment sand should match natural sand as closely as possible in size distribution and chemical characteristics. The upper beach should be plowed following nourishment to counteract compaction in turtle nesting areas. Avoid covering dune vegetation with sand. Try to avoid nourishment during turtle nesting; if this is not possible, relocate turtle nests. Biological monitoring techniques should be standardized according to specific guidelines.