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Spatial and temporal patterns of reproduction, larval settlement, and recruitment of the compound ascidian Aplidium stellatum

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Abstract

Spatial and temporal variation in recruitment of the compound ascidian Aplidium stellatum was examined on a shallow-water limestone outcropping in the Northeastern Gulf of Mexico from 1983 to 1985. Fifty-two percent of the recruits appeared on vertical surfaces, which were rare at this site. In the laboratory, tadpole larvae of A. stellatum consistently settled on vertical vs horizontal surfaces in a 2 to 1 ratio, regardless of the area of vertical surface offered. This settlement response was insufficient to account entirely for the field recruitment pattern, suggesting greater mortality of newly-settled individuals or larvae on horizontal vs vertical surfaces. Fifty-six percent of the variation in recruitment over 21 months could be explained by variation in the percentage of zooids brooding larvae in adult colonies. Over 28 consecutive months, the percentage of zooids brooding larvae was positively correlated with egg counts of the previous month (r 2=0.75), which in turn were weakly correlated with monthly average water temperature (r 2=0.36). These results suggest that larval production contributed substantially to temporal variation in recruitment of A. stellatum. The short larval life of tadpoles of A. stellatum and the relative isolation of the population were probably responsible for the correlation between recruitment and larval production.

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Author notes

  1. N. J. Gotelli

    Present address: Department of Zoology, Colorado State University, 80523, Fort Collins, Colorado, USA

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  1. Department of Biological Science, Florida State University, 32306, Tallahassee, Florida, USA

    N. J. Gotelli

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Communicated by J. M. Lawrence, Tampa

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Gotelli, N.J. Spatial and temporal patterns of reproduction, larval settlement, and recruitment of the compound ascidian Aplidium stellatum . Mar. Biol. 94, 45–51 (1987). https://doi.org/10.1007/BF00392899

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