Feeding, growth and food conversion of the marine cladoceran Penilia avirostris |
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Authors: | Paffenhfer Gustav-Adolf; Orcutt John D Jr |
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Institution: | 1Skidaway Institute of Oceanography P.O. Box 13687, Savannah, GA 31416
2A. G. Edwards and Sons, Inc. 2001 Building, 2001 9th Avenue, Vero Beach, FL 32960, USA |
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Abstract: | Ingestion and clearance rates, feeding behaviors and life historyvariables of the marine cladoceran Penilia avirostris were evaluatedover a range of food concentrations encountered in nature (0.013.0mm3 11 of Isochrysis galbana). Ingestion rates increasedand clearance rates decreased with increasing food concentration.No maximum feeding thresholds were observed over the range ofalgal concentrations offered. Weight-specific ingestion ratesdecreased with increasing body weight. Feeding behaviors suchas mandibular activity, abdominal claw rejections of cloggedfeeding structures and feeding appendage activity decreasedat a food level of 0.3 mm3 l1 of l. galbana. Peniliaavirostris had very poor survivorship at extremely low (0.01mm3 l1 and high (3.00 mm3 l1) food levels. Mortalitywas hardly affected at food levels of 0.031.0 mm3 l1Reproduction did not occur at food levels of |
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