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Diel Distribution Differences in the Sand Crab, Emerita analoga (Stimpson) (Decapoda, Hippidea)
Vol. 39, No. 3 (Nov., 1980), pp. 287-300
Published by: Brill
Stable URL: http://www.jstor.org/stable/20103561
Page Count: 14
You can always find the topics here!Topics: Aggregation, Beaches, Crabs, Night tables, Frequency distribution, Frequency ranges, Pool tables, Game fishes, Wind velocity, Water distribution
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Paired day and night samples of sand crabs (Emerita analoga) were taken from a beach near Santa Barbara, California. Regular, distinct changes were noted in day vs. night spatial distribution data: (1) density of day aggregation samples was nearly twice that of night samples at the same location, (2) large females were confined to the lower edge of the daytime distribution but were more evenly dispersed at night, and (3) the entire daytime distribution is shifted seaward, and nighttime shore-ward, relative to the same tide level (+3.0 ft, ebb). The findings reported here suggest that something more than a simple wave convergence hypothesis (e.g., Cubit, 1969) must be responsible for the observed distribution of E. analoga.
Crustaceana © 1980 Brill