Chapter 2.5 Carbon Turnover, Calcification and Growth in Coral Reefs

This chapter discusses the carbon turnover, calcification, and growth in coral reefs. Carbon turnover within a total reef community is a function of two distinct, biochemically interacting cycles. The first is the metabolic cycle consisting of the photosynthetic fixation of CO2 and the release of CO2 by respiration and decomposition processes. Superimposed on this are the direct incorporation of organic compounds (dissolved or particulate; living or non-living) originating outside the reef systems (in the adjacent ocean waters), and the loss of organic compounds from the reef system into the out-flowing water. The second is the inorganic carbonate cycle involving the biological and non-biological precipitation and dissolution of carbonates. Superimposed on this is the loss of particulate carbonates in suspension in the out-flowing water. The main chemical component of a coral-reef system is calcium carbonate, which occurs either as high-Mg calcite, aragonite, or low-Mg calcite. The mean calcification values in various environments at One Tree Reef are presented in the chapter. These data may be converted to an implied vertical growth rate potential assuming that accrual is dominantly aragonite (density = 2.89 g cm–3) and that there is 50% porosity after normal compaction

College students\u27 attitudes towards credit cards

Based on previous studies and using an approach of tripartite classification of attitude, an instrument measuring college students\u27 attitudes toward credit was carefully constructed. Its reliability and validity were tested. Chi‐square tests indicated that the factors associated with differences in attitude towards credit card use comprising three components ‐ affective, cognitive and behavioural included gender, academic major, living arrangement, number of credit cards owned, number of all cards (store cards, phone cards, and petrol cards) owned, time of using credit cards, and cosignment status. Implications for consumer credit educators and practitioners were specified. Copyright © 1995, Wiley Blackwell. All rights reserve