Initial stock assessment of Terebra maculata (Gastropoda: Terebridae) in Tubbataha Reefs Natural Park, Palawan, Philippines
Abstract
Initial stock assessment of the sand-dwelling gastropod Terebra maculata seldom encountered in heavily gleaned intertidal areas in mainland Palawan was conducted between December 2009 and April 2010 at the Tubbataha Reefs Natural Park (TRNP). During the reconnaissance survey, the species occurred abundantly in only one of three surveyed sites; surveys for size structure, abundance and movement were conducted in this site. Shell lengths ranged between 38–168 mm with length frequencies having two prominent peaks suggesting seasonal recruitment. Population estimate of 274 individuals (195–390 individuals at 95% confidence limit) was translated to an average density of 3.3 individuals for every 100 m2. Distance traveled was not related to size and shells tend to remain in areas that were exposed at low tide. Most shells showed signs of recovery from breakage. High abundance of T. maculata in one of three sites surveyed suggests the suitability of one of the habitats, the shell’s resilience from predators, and the absence of exploitation.
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