Abstract
Abstract Year-round studies were made of marine interstitial Tardigrada at Crane's Beach. The dominant assemblage of tardigrades, in typically low diversity, included Batillipes pennaki, B. bullacaudatus, B. dicrocercus, and Stygarctus granulatus. Despite peripheral co-occurrences, each species occupied a specific portion of the intertidal beach. S. granulatus occurred deep in sand in the upper one half of the beach, while the Batillipes species were more superficial. Abundant B. pennaki was flanked n its mid-beach position by common B. bullacaudatus in the upper half of the beach and by seasonal B. dicrocercus in the lower half. In winter, B. pennaki was found deeper in the sand; B. bullacaudatus moved closer to the low tidal line ; and S. granulatus remained deep within the sand. While year-round reproduction and availability of tardigrades occurred, densities were maximal either in spring and fall (B. bullacaudatus) or throughout the summer and fall (B. pennaki and S. granulatus). Concentrations of tar...
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