Abstract
Recently recruited urchins from the same brood, but with different initial sizes, may respond differently to similar environmental factors. The aim of this study was to assess and compare the effects of starvation and diet on the survival, growth rates in size and weight, and gonad index among small and large sub-adult purple sea urchins, Strongylocentrotus purpuratus. Small urchins ranged from 7.3 to 7.8 mm and large urchins from 11.8 to 14.1 mm (test diameters). Two independent experiments were performed. In the first experiment, sea urchins were fed during 22 weeks on Egregia menziesii (ad libitum) and for only 1 day month−1 (starved condition). Feeding regime significantly affected survival, somatic growth rate in size and weight, and gonad index, with higher means in the ad libitum treatments than in starving conditions. A recurrent cannibalism event by conspecifics occurred in small sea urchins under starving conditions. In the second experiment, sea urchins were fed during 13 weeks ad libitum with four diets: kelp (E. menziesii), coralline algae (Bossiella orbigniana), eelgrass (Phyllospadix scouleri) and a mixed diet of the three species. Survival was not affected by diet or urchin size, but diet significantly affected somatic growth rate in size and weight and gonad index. Kelp promoted the highest growth rate (2.23 ± 0.21 mm month−1), the mixed diet produced an intermediate growth (1.26 ± 0.21 mm month−1), while the lowest values corresponded to coralline algae and the eelgrass (0.30 ± 0.12 and 0.10 ± 0.03 mm month−1, respectively, means ± SE). The mean growth rate of small urchins (averaging all diets) was higher than in large specimens (1.17 ± 0.37 and 0.77 ± 0.28 mm month−1, respectively).
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Acknowledgments
This study was supported by the University of Baja California (11va Convocatoria Interna), PROMEP (project no. 103.5/04/1317), and CONACyT-México (National Council for Science and Technology) under a Ph.D. scholarship to J. Sonnenholzner. We also thank Enrique Valenzuela, Filiberto Nuñez and Griselda Parés-Sierra for their technical assistance and two anonymous reviewers for their valuable comments to ensure the quality of the manuscript.
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Sonnenholzner, J.I., Montaño-Moctezuma, G., Searcy-Bernal, R. et al. Effect of macrophyte diet and initial size on the survival and somatic growth of sub-adult Strongylocentrotus purpuratus: a laboratory experimental approach. J Appl Phycol 23, 505–513 (2011). https://doi.org/10.1007/s10811-010-9619-2
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DOI: https://doi.org/10.1007/s10811-010-9619-2