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High temperature acclimation alters the emersion behavior in the crab Neohelice granulata
Journal of Thermal Biology ( IF 2.7 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.jtherbio.2020.102617
Lamia Marques Halal 1 , Bruna Soares Ayres 1 , Tábata Martins Lima 1 , Fábio Everton Maciel 1 , Luiz Eduardo Maia Nery 1
Affiliation  

An increase in environmental temperature can deleteriously affect organisms. This study investigated whether the semiterrestrial estuarine crab Neohelice granulata uses emersion behavior as a resource to avoid thermal stress and survive higher aquatic temperatures. We also examined whether this behavior is modulated by exposure to high temperature; whether, during the period of emersion, the animal loses heat from the carapace to the medium; and whether this behavior is altered by the temperature at which the animal has been acclimated. The lethal temperature for 50% of the population (LT50) was determined through 96-h mortality curves in animals acclimated at 20 °C and 30 °C. The behavioral profile of N. granulata during thermal stress was based on monitoring crab movement in aerial, intermediary, and aquatic zones. Acclimation at a higher temperature and the possibility of emersion increased the thermotolerance of the crabs and the synergistic effect of acclimation temperature. The possibility of leaving the hot water further increased the resistance of these animals to thermal stress. We observed that when the crab was subjected to thermal stress conditions, it spent more time in the aerial environment, unlike under control conditions. Under the experimental conditions, it made small incursions into the aquatic environment and stayed in the aerial environment for a longer time in order to cool its body temperature. The animals acclimated at 20 °C and placed into water at 35 °C remained in the aerial zone. The animals acclimated and maintained at 30 °C (control) that were placed in water at 35 °C with the possibility of emerging into hot air transited more frequently between the aquatic and aerial zones than did the animals that were put in water at 35 °C with the possibility of emerging into a cooler air environment. We conclude that emergence behavior allows N. granulata to survive high temperatures and that this behavior is influenced by acclimation temperature.

中文翻译:

高温驯化改变了螃蟹 Neohelice granulata 的出水行为

环境温度的升高会对生物体产生有害影响。本研究调查了半陆栖河口蟹 Neohelice granulata 是否使用出水行为作为避免热应激和在较高水温下生存的资源。我们还研究了这种行为是否受高温影响;在出现期间,动物是否会从甲壳向培养基散失热量;这种行为是否会因动物适应的温度而改变。50% 的种群 (LT50) 的致死温度是通过驯化在 20°C 和 30°C 的动物的 96 小时死亡率曲线确定的。N. granulata 在热应激期间的行为特征基于监测空中、中间和水生区域的螃蟹运动。在较高温度下驯化和出现的可能性增加了螃蟹的耐热性和驯化温度的协同效应。离开热水的可能性进一步增加了这些动物对热应激的抵抗力。我们观察到,当螃蟹处于热应激条件下时,它在空中环境中停留的时间更长,这与在控制条件下不同。在实验条件下,它小幅侵入水生环境,并在空中环境中停留较长时间,以降温体温。动物在 20°C 适应环境并放入 35°C 的水中,留在空中区域。动物适应并保持在 30°C(对照),它们被放置在 35°C 的水中,有可能进入热空气,在水生和空中区域之间的过渡比在 35°C 下放置在水中的动物更频繁C 有可能进入较冷的空气环境。我们得出的结论是,出苗行为使颗粒状猪笼草能够在高温下存活,并且这种行为受驯化温度的影响。
更新日期:2020-07-01
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