Environmental influences

Lucas, John S. (2008). Environmental influences. In Paul C. Southgate and John S. Lucas (Ed.), The Pearl Oyster (pp. 187-229) Kidlington, Oxford, UK: Elsevier. doi:10.1016/B978-0-444-52976-3.00006-1


Author Lucas, John S.
Title of chapter Environmental influences
Title of book The Pearl Oyster
Place of Publication Kidlington, Oxford, UK
Publisher Elsevier
Publication Year 2008
Sub-type Research book chapter (original research)
DOI 10.1016/B978-0-444-52976-3.00006-1
ISBN 9780444529763
9780080931777
Editor Paul C. Southgate
John S. Lucas
Chapter number 6
Start page 187
End page 229
Total pages 43
Total chapters 16
Language eng
Subjects 1100 Agricultural and Biological Sciences
Formatted Abstract/Summary
This chapter focuses the most important factors affecting pearl oysters as individual factors. Pearl oysters in their natural environment experience the simultaneous effects of a wide array of environmental factors. Food, almost inevitably, is a major environmental factor. Pearl oysters filter feed on suspended particulate matter (SPM), consisting mainly of bacteria, microalgae, suspended organic matter, and inorganic particles. Particle size, density, composition, and digestibility affect the nutritional value of the SPM. Optimum densities of microalgae are in the 10–100 × 103 cells/mL range. As in all poikilotherms, ambient temperature profoundly influences pearl oysters through its effects on MR and related processes, such as respiration and feeding rates. Small diatoms are the predominate food of Akoya pearl oysters in some Japanese and Korean pearl farming areas. Quantity of food is also a major factor in the physiological condition, metabolic function, growth, and survival of pearl oysters. Studies of the influence of temperature on metabolic and related physiological processes of bivalves have shown that there is usually an optimum temperature or narrow temperature range for each species at which there is maximum MR, growth rate, and survival. Water currents are very important in bringing food and oxygen to pearl oysters and carrying away their wastes; however, strong currents may be deleterious by increasing suspended inorganic matter, interfering with filtering and preingestive processes.
Q-Index Code B1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Book Chapter
Collection: School of Biological Sciences Publications
 
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