Variations in larval growth and metabolism of an estuarine shrimp Palaemonetes pugio during toxicosis by an insect growth regulator |
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| Institution: | 1. U.S. Environmental Protection Agency, Environmental Research Laboratory, Gulf Breeze, FL 32561, U.S.A.;2. Technical Resources, Inc., Environmental Research Laboratory, Gulf Breeze, FL 32561, U.S.A.;1. Centro Universitário da FEI, São Paulo, Brazil;2. Newcastle Business School, Northumbria University, United Kingdom;1. University of Groningen, Grote Kruisstraat 2/1, 9712TS, Groningen, The Netherlands;2. MBO, P.C. Hooftlaan 1, 9673GS, Winschoten, The Netherlands;1. MOE Key Laboratory for Analytical Science of Food Safety and Biology, Fujian Provincial Key Laboratory of Analysis and Detection for Food Safety, College of Chemistry, Fuzhou University, Fuzhou, Fujian 350116, China;2. College of Biological Science and Engineering, Fuzhou University, Fuzhou, Fujian 350116, China;1. Centre for Research-Creation in Digital Media, Sunway University, 5 Jalan Universiti Bandar Sunway, 47500, Petaling Jaya, Selangor, Malaysia;2. School of Creative Industries, Faculty of Education and Arts, University of Newcastle, University Drive, Callaghan, NSW, 2308, Australia;1. North Carolina State University, United States;2. Towson University, United States;3. University of North Carolina at Charlotte, United States |
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| Abstract: | 1. Exposure of the estuarine shrimp, Palaemonetes pugio, to a juvenile hormone analogue (?8 μg methoprene 1?1) throughout larval development inhibited successful completion of metamorphosis.2. Methoprene exposure retarded growth in early larval stages and postlarvae, but enhanced growth in premetamorphic larvae.3. Respiration rates of early larvae were elevated by methoprene exposure, but not so older larvae or post larvae.4. Lower net growth efficiency (K2 values) in methoprene-exposed early larvae suggests that increased metabolic demands reduced assimilated energy available for growth.5. Modifications in O:N ratios of premetamorphic larvae and postlarvae suggest that methoprene altered substrate utilization patterns during metamorphosis. |
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