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Effects of temperature and salinity acclimation of adults on larval survival, physiology, and early development of Lytechinus variegatus (Echinodermata: Echinoidea)


Effects of temperature and salinity acclimation of adults on larval survival, physiology, and early development of Lytechinus variegatus (Echinodermata: Echinoidea)



Marine Biology (Berlin): 1164: 583-591



ISSN/ISBN: 0025-3162

DOI: 10.1007/bf00355477

Larval survival and developmental rates of Lytechinus variegatus (Lamarck) were determined as a function of temperature and salinity in two experiments by: (1) directly transferring fertilized eggs to 35, 30, 27.5, 25, 20, 15, and 10 permill S seawater at 18 and 23 degree C, and (2) acclimation of adult sea urchins to the conditions described above for 1 to 4 wk prior to spawning. Developmental rates and percent survival of larvae prior to metamorphosis varied directly with salinity. Survival of plutei to metamorphosis decreased at salinities below 35% (Q-10 values for metamorphosis = 0.380 to 0.384). Temperature and salinity significantly (P lt 0.05) affected metabolic rates of L. variegatus plutei. These results show that L. variegatus larvae are stenohaline when compared to larvae of other echinoderm species. LC-50 values ( permill S), developmental rates, and survival to metamorphosis indicate that acclimation of adult sea urchins to lower salinity prior to spawning and fertilization does not enhance development or survival of embryos exposed to low salinity .

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Accession: 008582960

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Related references

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