Modeling oyster populations. 3. Critical feeding periods, growth and reproduction
MetadataShow full item record
A time-dependent population dynamics model for oyster (Crassostrea virginica) populations is used to test the hypothesis that variations in the seasonal sequence in temperature and food supply are responsible for observed variations in oyster reproductive effort. Simulations show that a few degrees change in temperature or a small shift in timing of the spring or fall bloom can considerably alter the duration of spawning and the seasonal spawning patterns. Furthermore, the timing of the spring and fall plankton blooms relative to the spring increase and fall decrease in temperature is crucial in determining reproductive effort over a spawning season. Delay of the spring bloom with respect to the spring temperature rise increases reproductive effort and affects the number and timing of spawning pulses. Simulations using environmental conditions appropriate for Laguna Madre, Galveston Bay and Chesapeake Bay show that reproductive effort decreases with increasing latitude and that the timing of increases in food supply relative to rising temperature becomes more important. Other environmental factors such as low salinity events and turbidity have a lesser effect on population growth and reproduction than do changes in temperature and food supply. The model results suggest that oyster reproductive patterns at higher latitudes (e.g. Chesapeake Bay) are characterized by discrete spawning pulses; continuous spawning becomes more frequent at lower latitudes. The results of this modeling study suggest that the characteristically-wide range of oyster reproductive efforts recorded in the literature may result from seemingly minor changes in the environment
Showing items related by title, author, creator and subject.
Three-dimensional hydrodynamic modeling of Galveston Bay. (Houston Ship Canal enlargement impact upon oyster populations) Berger RC (, 1992 199)The effects of the enlargement of the Houston Ship Channel through Galveston Bay have been evaluated through a series of models and methods. The final model will be linked to an oyster (Crassostrea virginica ) population ...
CHAMBERS GV; SPARKS AK (, 1959)AN ECOLOGICAL SURVEY WAS INITIATED IN THE SUMMER OF 1957 WITH DATA COLLECTED AT FREQUENT REGULAR INTERVALS. THIS REPORT INCLUDES THE COMPARISON OF DATA ON TEMPERATURE, CHLORINITY, DISSOLVED OXYGEN, AND RELATED QUANTITIES ...
Population structure of spotted seatrout inhabiting the Texas Gulf Coast: An allozymic perspective King TL; Pate HO (, 1992)Spotted seatrout Cynoscion nebulosus (N = 674) from 12 geographic populations along the Texas and northern Mexico Gulf coasts were surveyed to determine population structure as indicated by the distribution of electrophoretically ...