Wu Fangli, Wang Ting, Cui Shuaikang, Xie Zhe, Dupont Sam, Zeng Jiangning, Gu Huaxin, Kong Hui, Hu Menghong, Lu Weiqun, Wang Youji
College of Fisheries and Life Science, Shanghai Ocean University, 999 Huchenghuan Road, Shanghai 201306, China.
Department of Biological and Environmental Sciences, Sven Lovén Centre for Marine Infrastructure - Kristineberg, University of Gothenburg, Fiskebäckskil, Sweden.
Mar Pollut Bull. 2017 Jul 15;120(1-2):99-108. doi: 10.1016/j.marpolbul.2017.04.053. Epub 2017 May 5.
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°C and 25°C). The order of prey selection by C. japonica was Potamocorbula laevis, Ruditapes philippinarum, Tegillarca granosa and Mactra veneriformis. Under high pCO, times for searching, breaking, eating and handling were all significantly longer than those at the normal pCO, and the prey profitability and predation rate under high pCO were significantly lower than normal pCO. 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 negatively affected the foraging behavior, but high temperature actively stimulated the foraging behaviors of crabs.
我们研究了日本蟳（Charybdis japonica）在暴露于pH值（7.3和8.1）和温度（18°C和25°C）的四种组合下的猎物选择和觅食行为。日本蟳的猎物选择顺序为光滑河篮蛤（Potamocorbula laevis）、菲律宾蛤仔（Ruditapes philippinarum）、泥蚶（Tegillarca granosa）和四角蛤蜊（Mactra veneriformis）。在高pCO₂条件下，搜索、破碎、进食和处理时间均显著长于正常pCO₂条件下，高pCO₂条件下的猎物盈利能力和捕食率显著低于正常pCO₂条件。此外，温度对觅食行为有显著影响，但其影响不如pH值强烈；高温下的搜索、进食和处理时间显著低于低温，高温下的猎物捕食率显著高于低温。总之，高pCO₂对觅食行为有负面影响，但高温对螃蟹的觅食行为有积极的刺激作用。
