. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 8+0 6+0 Riprap. 33 Meters FIGURE 1. Map of the research site on Mashnee Dike. We denned the East Pole as the steel pipe located in 1933 by the U. S. Army Corps of Engineers at 70°37'46"W and 41°46'34"N. Other pipes placed at 100 ft intervals mark the main baseline. All counts were taken in transects 1, 2, and 3 as denned by the shoreline and the East Pole of the main baseline. Broken lines indicate sectors of the transects. The water elevation at mean high water () is feet above mean low wate
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 8+0 6+0 Riprap. 33 Meters FIGURE 1. Map of the research site on Mashnee Dike. We denned the East Pole as the steel pipe located in 1933 by the U. S. Army Corps of Engineers at 70°37'46"W and 41°46'34"N. Other pipes placed at 100 ft intervals mark the main baseline. All counts were taken in transects 1, 2, and 3 as denned by the shoreline and the East Pole of the main baseline. Broken lines indicate sectors of the transects. The water elevation at mean high water () is feet above mean low water (). The access road on the dike is lined with utility poles that support overhead wires (OHW). The camera site 100 ft from the East Pole was used in a concurrent study of visually guided behavior of Limit/us (Barlow el al., 1984, 1986). dramatic fluctuations would appear to produce a forbidding environment, many ma- rine and terrestrial species either inhabit the intertidal zones permanently or migrate into them for important biological activities (review: Neumann, 1981). Many such animals synchronize their activities with the major environmental rhythms of the intertidal zone. Preliminary observations indicated that lunar phase, tide height, and sunlight influence the mating activity ofLimulus (Howard el al., 1984). We report here a quantitative study of the imigration ofLimulus to the tidal zone for mating. We examine the temporal relationships between migratory behavior and the seasonal, lunar, tidal, and daily light cycles. MATERIALS AND METHODS We quantified mating activity as the number of animals appearing within the intertidal zone. This definition is based on prior observations that large numbers of adult horseshoe crabs regularly appear along the coastline in conjunction with breed- ing activities (Schuster, 1957, 1958, 1979;Cavanaugh, 1975; Rudloe and Herrnkind, 1976;Rudloe, 1978, 1979, 1980; Barlow et al., 1982, 1984; Cohen and Brockmann, 1983; Howard et a
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
