. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 404 PRASKRT LOHAVANIJ \Y \ The habitat at Cro\v Neck is unusual. Because it is on the shore of a con- stricted channel through which large amounts of water pass to and from large inner hays, to the extent of changing their levels many feet on each cycle, it has an almost continuous hut reversing flow of water. This resembles a rather swift river which flows nearly six hours in one direction, followed by a brief period of nearly slack water, and then another period of rapid flow in the opposite direction, again for nearly six
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 404 PRASKRT LOHAVANIJ \Y \ The habitat at Cro\v Neck is unusual. Because it is on the shore of a con- stricted channel through which large amounts of water pass to and from large inner hays, to the extent of changing their levels many feet on each cycle, it has an almost continuous hut reversing flow of water. This resembles a rather swift river which flows nearly six hours in one direction, followed by a brief period of nearly slack water, and then another period of rapid flow in the opposite direction, again for nearly six hours. One would thus expect only rocks and relatively coarse sediments, which are in fact found in the main channels. Most of the sand dollars were found living in eddies which occurred in the small wider parts of the channel. The rather soft sandy substratum under these eddies was generally finer than in the main channels and was often overlain by a layer of mud, silt, or detritus. Thus, the sand dollars living in this habitat live in contact with a 80 70 .60 E 50 40 Ml). 411 50 60 Length ram. 70 80 FIGTKE 2. Relationship of width to length. HB—Hampton Beach; I1H—Hampton Harbor; BM—Bailey's Mistake; CN—Crow Neck. nearly continuous current hut encounter almost no pounding by waves, and the current's direction changes only a few times a day. It appears that they tend to grow longer than wide. In contrast with the conditions at Crow Neck we find at Hampton Beach and Bailey's Mistake little continuous current and considerable exposure to surf. At Hampton Beach, particularly, the surf action is considerable almost all the time. Here the sand grains are line and hard-packed. The situation at Bailey's Mistake is similar to Hampton Beach but there appears to be some reduction in surf action by the headlands to either side of the entrance to the bay, as is made evident by the eel grass growing in the bay, which in turn appears to give the organisms living among it additional
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
