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Effects of seawater pH and temperature on foraging behavior of the Japanese stone crab Charybdis japonica

Journal article
Authors F. L. Wu
T. Wang
S. K. Cui
Z. Xie
Samuel Dupont
J. N. Zeng
H. X. Gu
H. Kong
M. H. Hu
W. Q. Lu
Youji Wang
Published in Marine Pollution Bulletin
Volume 120
Issue 1-2
Pages 99-108
ISSN 0025-326X
Publication year 2017
Published at The Sven Lovén Centre for Marine Sciences
Department of Biological and Environmental Sciences
Pages 99-108
Language English
Links doi.org/10.1016/j.marpolbul.2017.04...
Keywords pH, Temperature, Crab, Prey selection, Foraging behavior, Charybdis japonica, CANCER-IRRORATUS SAY, PREY SIZE-SELECTION, CARCINUS-MAENAS L., ASTERIAS-VULGARIS VERRILL, PLACOPECTEN-MAGELLANICUS (GMELIN), MARINE, ANIMAL BEHAVIOR, CORAL-REEF FISHES, HIGH CO2 OCEAN, PHYSIOLOGICAL, ENERGETICS, CALLINECTES-SAPIDUS, ESSON J, 1978, ECOLOGY, V59, P211
Subject categories Marine ecology

Abstract

We examined prey selection and foraging behaviors of the crab Charybdis japonica exposed to four combinations of pH (7.3 and 8.1) and temperature (18 degrees C and 25 degrees C). The order of prey selection by C. japonica was Potamocorbula laevis, Ruditapes philippinarum, Tegillarca granosa and Mactra veneriformis. Under high pCO(2), times for searching, breaking, eating and handling were all significantly longer than those at the normal pCO(2), and the prey profitability and predation rate under high pCO(2) were significantly lower than normal pCO(2). Moreover, temperature significantly influenced the foraging behaviors, but its effects were not as strong as those of pH; times for searching, eating and handling under high temperature were significantly lower than the low temperature, and the prey predation rates under high temperature was significantly higher than low temperature. In conclusion, high pCO(2) negatively affected the foraging behavior, but high temperature actively stimulated the foraging behaviors of crabs.

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