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POPULATION STRUCTURE PATTERNS OF A COMMON RED SEA ECHINOID (TRIPNEUSTES GRATULA ELATENSIS)

In: Israel Journal of Ecology and Evolution
Authors:
J. DAFNI Inter-University Institute, H. Steinitz Marine Biology Laboratory

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R. TOBOL Secondary School at the Hebrew University

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Recruitment and size distribution patterns of Tripncustes gratilla elatensis were studied between 1979–1984 in the northern Gulf of Elat (= Gulf of 'Aqaba, Red Sea). Annual settlement of postlarval echinoids in the subtidal zone of a wave-exposed shore occurs at lute spring and the recruits grow rapidly, emerging from their understone shelters and moving offshore. In the first winter they attain adult size (>35mm) before being eliminated by destructive late-winter wave storms. The recruitment in a nearby wave-protected coral reef area is less predictable, and the subtidal juveniles retain a cryptic behaviour for >1 yr. These juveniles are apparently subject to predation by wrasses (Coris uygula, Labridae) when crossing the sandy lagoon to the reef. Consequently, the entire 35–50 mm size-group was absent from this site, the reef-Hat adults, on the other hand, exhibited stable size distribution patterns for several consecutive years, indicative of high survival. Following an unusual multi-recruitment event, in 1984, both sites became densely populated with postlarvae, and numerous growing urchins crossed the lagoon, recruiting the reef-flat subpopulation. These recruitment and life-history patterns generally agree with Ebert's (1982) model that emphasizes the role of recruitment variability and pre-reproductive survival on the determination of.longevity, demonstrating the role of predators and surf conditions in shaping the population structure of this echinoid.

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