Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 2 of 2
Full-Text Articles in Marine Biology
Settlement Of Oyster (Crassostrea-Virginica) Larvae - Effects Of Water-Flow And A Water-Soluble Chemical Cue, Ej Turner, Rk Zimmerfaust, Ma Palmer, M Luckenbach, Nd Pentcheff
Settlement Of Oyster (Crassostrea-Virginica) Larvae - Effects Of Water-Flow And A Water-Soluble Chemical Cue, Ej Turner, Rk Zimmerfaust, Ma Palmer, M Luckenbach, Nd Pentcheff
VIMS Articles
Although previous evidence indicates that larvae of benthic marine invertebrates can respond to waterborne cues in still water, the importance of waterborne cues in mediating natural settlement out of flowing water has been questioned. Here, we summarize the results of flume experiments demonstrating enhanced settlement of oyster larvae in small target wells (circles of 7-cm diam) with the release of a waterborne settlement cue compared to identical substrates without the cue. In concurrent still-water experiments, more oyster larvae settled in solutions of waterborne cue than in seawater controls. Velocity and electrochemical measurements of a conservative tracer verified that at low …
Age, Growth Rate, Sexual Dimorphism And Fecundity Of Knobbed Whelk Busycon Carica (Gmelin, 1791) In A Western Mid-Atlantic Lagoon System, Virginia, Micheal Castagna, John H. Kraeuter
Age, Growth Rate, Sexual Dimorphism And Fecundity Of Knobbed Whelk Busycon Carica (Gmelin, 1791) In A Western Mid-Atlantic Lagoon System, Virginia, Micheal Castagna, John H. Kraeuter
VIMS Articles
Growth, onset of sexual maturity, and sexual reversal in laboratory-reared Busycon carica have been examined. Animals first matured at 9 years of age. The first sign of maturity in all animals we reared was the presence of the penis. At 12.4 years of age, one of the animals laid an egg case that did not contain embryos. This animal, and all others, still retained a penis. At 13.5 years, three egg cases were laid and over half the animals had undergone sex reversal (loss of the penis). Field studies have shown that egg strings are laid in the fall on …