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INFLUENCES OF UPPER FLORIDAN AQUIFER WATERS ON RADIOCARBON IN THE OTOLITHS OF GRAY SNAPPER (Lutjanus griseus) IN THE GULF OF MEXICO

Published online by Cambridge University Press:  06 May 2020

Allen H Andrews*
Affiliation:
University of Hawaii at Manoa, Department of Oceanography, 1000 Pope Road, Honolulu, HI 96822 USA
Beverly K Barnett
Affiliation:
National Marine Fisheries Service, Southeast Fisheries Science Center, Panama City Laboratory, 3500 Delwood Beach Road, Panama City, FL 32408 USA
Jeffrey P Chanton
Affiliation:
Department of Earth Ocean and Atmospheric Science, Florida State University, Tallahassee, FL 32306 USA
Laura A Thornton
Affiliation:
Riverside Technology, Inc. Fort Collins, Colorado, United States of America under contract to National Marine Fisheries Service, Southeast Fisheries Science Center, Panama City Laboratory, Panama City, FL 32408 USA
Robert J Allman
Affiliation:
National Marine Fisheries Service, Southeast Fisheries Science Center, Panama City Laboratory, 3500 Delwood Beach Road, Panama City, FL 32408 USA
*
*Corresponding author. Email: astrofish226@gmail.com.

Abstract

The otoliths (ear stones) of fishes are commonly used to describe the age and growth of marine and freshwater fishes. These non-skeletal structures are fortuitous in their utility by being composed of mostly inorganic carbonate that is inert through the life of the fish. This conserved record functions like an environmental chronometer and bomb-produced radiocarbon (14C)—a 14C signal created by atmospheric testing of thermonuclear devices—can be used as a time-specific marker in validating fish age. However, complications from the hydrogeology of nearshore marine environments can complicate 14C levels, as was the case with gray snapper (Lutjanus griseus) along the Gulf of Mexico coast of Florida. Radiocarbon of these nearshore waters is influenced by freshwater input from the karst topography of the Upper Floridan Aquifer—estuarine waters that are 14C-depleted from surface and groundwater inputs. Some gray snapper likely recruited to this kind of environment where 14C levels were depleted in the earliest otolith growth, although age was validated for individuals that were not exposed to 14C-depleted waters to an age of at least 25 years with support for a 30-year lifespan.

Information

Type
Research Article
Copyright
© 2020 by the Arizona Board of Regents on behalf of the University of Arizona

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