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首页> 外文期刊>Marine biology >The effect of salinity on survival, bioenergetics and predation risk in the mud crabs Panopeus simpsoni and Eurypanopeus depressus
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The effect of salinity on survival, bioenergetics and predation risk in the mud crabs Panopeus simpsoni and Eurypanopeus depressus

机译：盐度对泥蟹Panopeus simpsoni和Eurypanopeus depressus的存活，生物能和捕食风险的影响

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摘要

The effect of salinity on survival, bioenergetics and predation risk was studied in two common mud crabs in the Gulf of Mexico, Eurypanopeus depressus and Panopeus simpsoni. Eurypanopeus survived better at low salinities (the 28-day LC_(50) of E. depressus was 0.19 PSU compared with 6.97 PSU for P. simpsoni). While low salinity increased energy expenditure and reduced food consumption and absorption, resulting in lower scope for growth, identical responses to salinity occurred in both species. Both species also had similar salinity-dependent patterns of hyper-osmoregulation. Because these physiological mechanisms could not explain differences between the two species in salinity tolerance, we explored the effect of salinity on competition for refugia. Eurypanopeus had higher resource holding potential for refugia, especially at low salinity. As a consequence it had lower predation risk to blue crabs in laboratory experiments. The higher tolerance by E. depressus for low salinities, and greater resource holding potential for refugia may explain why it has a more euryhaline distribution than P. simpsoni.
机译：在墨西哥湾的两只常见的泥蟹Eurypanopeus depressus和Panopeus simpsoni中研究了盐度对生存，生物能和捕食风险的影响。 Eurypanopeus在低盐度条件下存活得更好（28 d。LC。（50）E. depressus为0.19 PSU，而S.simpsoni为6.97 PSU）。低盐度增加了能量消耗并减少了食物的消耗和吸收，从而导致生长范围减小，但两种物种对盐度的反应相同。两种物种都具有相似的盐度依赖性高渗调节模式。由于这些生理机制无法解释这两种物种在耐盐性上的差异，因此我们探讨了盐度对避难所竞争的影响。 Eurypanopeus具有较高的资源储备潜力，特别是在低盐度条件下。因此，它在实验室实验中对蓝蟹的捕食风险较低。抑郁大肠杆菌对低盐度的耐受性较高，并且对避难所的资源持有潜力更大，这可以解释为什么它比辛普森菌具有更多的盐卤分布。

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