Climate changes affecting aquatic environments are increasing, and the resultant environmental challenges require animals to adopt alternative compensatory behavioral and physiological strategies. In particular, low levels of dissolved O₂ are a regular problem for estuarine animals, leading to activation of a series of behavioral and physiological responses. This study on the semi-terrestrial crab Neohelice granulata examined patterns of emersion behavior under different levels of dissolved O₂ availability and the role of lactate in this behavior. Emersion behavior was recorded for 4.5 h for crabs in water at four different levels of dissolved O₂ (6, 3, 2, and 1 mg O₂/L) and with free access to air. Oxygen consumption and hemolymphatic lactate levels were measured using the same experimental design. Emersion behavior was also recorded for 70 min in normoxic water after lactate or saline injections. Crabs increased their emersion behavior only in severe hypoxia (1 mg O₂/L), and O₂ consumption decreased under more severe hypoxic conditions. Despite the increase in emersion behavior, which leads to higher O₂ availability, an increase in hemolymphatic lactate levels indicates that the animals still need to resort to anaerobic pathways to fulfill their metabolic demand. Furthermore, animals injected with lactate showed higher emersion behaviors than animals injected with a saline solution even in normoxia. These results suggest that the increase in hemolymphatic lactate can act directly or indirectly as a trigger for the increase in emersion behavior in the semi-terrestrial crab N. granulata.

影响水生环境的气候变化正在加剧，由此带来的环境挑战要求动物采取替代性的补偿性行为和生理策略。特别地，对于河口动物而言，低水平的溶解的O ₂是一个经常性的问题，导致一系列行为和生理反应的激活。这项关于半陆地蟹新鳞片颗粒的研究检查了在不同水平的溶解氧₂有效性和乳酸盐在这种行为中的作用下的萌芽行为模式。记录了水中螃蟹在四种不同水平的O ₂（6、3、2和1 mg O ₂浓度）下的发芽行为4.5 h/ L），并可以免费使用空气。使用相同的实验设计测量氧气消耗量和血淋巴乳酸水平。注射乳酸或盐水后，在常氧水中也记录了70分钟的出没行为。螃蟹仅在严重的缺氧（1 mg O ₂ / L）下才增加其出苗行为，而在更严重的缺氧条件下O _2的消耗量减少。尽管出现了更多的出行行为，这导致更高的O ₂可用性，血淋巴乳酸水平的升高表明动物仍然需要诉诸厌氧途径来满足其代谢需求。此外，即使在常氧状态下，注射乳酸的动物也比注射盐溶液的动物表现出更高的出苗行为。这些结果表明，血淋巴乳酸盐的增加可以直接或间接地引起半陆生蟹N. granulata出苗行为增加的触发。