温度对中华绒螯蟹捕食行为和代谢生理的影响OA

Temperature represents a critical environmental factor governing the pond aquaculture of the Chinese mitten crab(Eriocheir sinensis).Fluctuations in pond water temperature exert pronounced impacts on the behavioral and physiological processes of this species,which are directly linked to aquaculture yield and economic profitability.This study was conducted to elucidate the effects of temperature on the foraging behavior and metabolic performance of E.sinensis.Within the theoretical framework of the foraging cycle,video tracking analysis was applied to systematically investigate the predation dynamics of E.sinensis on Sinotaia quadrata and its corresponding metabolic responses across five temperature treatments(13,18,23,28,and 33℃).The key results demonstrated that the highest predation rate was recorded in the 28℃group,which was significantly greater than that in all other temperature groups(P<0.05).As temperature increased,resting time was prolonged while locomotion duration decreased,and the time allocated to prey searching and handling exhibited an initial increasing trend followed by a subsequent decline.The encounter probability between crabs and snails was significantly reduced in the 33℃group(P<0.05).Behavioral transitions predominantly occurred between resting and moving states,following a distinct nonlinear pattern.Notably,no behavioral transition from handling to searching was observed in the 13℃treatment.The oxygen consumption rate increased gradually with the elevation of temperature.The concentrations of crustacean hyperglycemic hormone(CHH),glucose,and hemocyanin in hemolymph decreased initially and then increased,reaching their maximum values in the 33℃group where they were significantly higher than those in all other treatments(P<0.05).Collectively,under both low-and high-temperature stress,E.sinensis modulates its predatory behavior and physiological metabolic status,forming a behavioral adaptation strategy prioritizing survival maintenance.This study provides a solid theoretical foundation for precise water temperature regulation and optimized feeding management in the pond culture of E.sinensis.