Abstract
Temperature and salinity affected both length of larval development and mortality inNecora puber collected in the Ría de A Coruña during December 1984 and January 1985. Development time decreased considerably with increased temperature. This decrease was sharper when temperature increased from 15° to 20°C than when it increased from 20° to 25°C. At 35‰S, average development took 48, 32 and 28 d at 15°, 20° and 25°C, respectively. At the three salinities tested (25, 30 and 35‰), larval development was completed only at 15°C, at 20°C/30 and 35‰S, and at 25°C/35‰S. Development times at 15° and 20°C were highly significantly different at both 35 and 30‰S (P ≪ 0.01). However, there were no significant differences between development times at 20° and 25°C (P > 0.05). Within any one specific temperature series, no significant difference was observed between the salinity values tested (P > 0.05). The duration of each of the five zoeal stages was similar within each and the same temperature/salinity combination, whereas the duration of the megalop was twice as long as any of the zoeal stages. The combination of the lowest temperature (15°C) and the highest salinity (35‰) tested resulted in the greatest larval survival of 28%. Highest mortality occurred at 25°C, at which temperature development was completed only at 35‰S. A sharp drop in larval survival was observed in the transition period Zoea V — megalop in all combinations of temperature and salinity tested. Within the limits of tolerance to temperature and salinity, the former effected more pronounced differences in the duration of larval development, while salinity appeared to constitute a limiting factor for survival.
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Communicated by J. M. Pérès, Marseille
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Mene, L., Alvarez-Ossorio, M.T., González-Gurriarán, E. et al. Effects of temperature and salinity on larval development ofNecora puber (Brachyura: Portunidae). Mar. Biol. 108, 73–81 (1991). https://doi.org/10.1007/BF01313473
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DOI: https://doi.org/10.1007/BF01313473