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Biol Bull 163: 348-354. (October 1982)
© 1982 Marine Biological Laboratory
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EFFECT OF TEMPERATURE AND SALINITY ON LARVAL DEVELOPMENT OF SIBLING SPECIES OF ECHINASTER (ECHINODERMATA: ASTEROIDEA) AND THEIR HYBRIDS

STEPHEN A. WATTS 1, R. E. SCHEIBLING 1, ADAM G. MARSH 1, and JAMES B. MCCLINTOCK 1

1 Department of Biology, University of South Florida, Tampa. FL 33620

Adult Echinaster Type 1 and Type 2 were collected along the west coast of Florida (25° C, 32permilS) and induced to spawn in the laboratory. Two-day old larvae of Type 1, Type 2, and their hybrids were subjected to temperature (T) and salinity (5) combinations (20, 25, 30°C; 25, 32, 39permilS). Response surface isopleths indicate that Type 1 and Type 2 larvae exhibit different developmental and growth rates in response to T/S combinations. Salinity was a dominant factor affecting development and growth. High and low salinities inhibited spine development. Developmental rates were directly related to temperature. Type 2 larvae exhibited a greater tolerance to temperature changes than did Type 1. Hybrids showed intermediate development and growth responses at the apparent optimal conditions and exhibited maternal characteristics.

Submitted on March 23, 1982
Accepted on July 12, 1982






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Copyright © 1982 by the Marine Biological Laboratory.