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首页> 外文期刊>Marine ecology progress series >Ontogenetic shift in stress tolerance thresholds of Mytilus trossulus: effects of desiccation and heat on juvenile mortality
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Ontogenetic shift in stress tolerance thresholds of Mytilus trossulus: effects of desiccation and heat on juvenile mortality

机译：Mytilus trossulus的胁迫耐受性阈值的自体转变：干燥和热量对少年死亡率的影响

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摘要

We examined the sensitivity of newly settled Mytilus trossulus to heat and desiccation, as well as the ontogeny of sensitivity through the early benthic phase. Laboratory experiments were conducted to determine the sensitivity of mussels to the full range of temperatures and desiccation levels experienced in the field. Mussels of 1 to 2 mm shell length (SL) experienced a threshold of heat tolerance at 34℃ and a threshold of desiccation tolerance at vapour pressure deficit levels of 1.01 kPa. Extended periods of temperatures reaching or exceeding lethal levels for newly settled M. trossulus occurred relatively rarely in Barkley Sound, British Columbia, Canada, whereas lethal levels of desiccation occurred often during the recruitment season and were usually sustained for several hours. Desiccation, therefore, appears to be a substantially greater threat to recently settled M. trossulus than heat. A final laboratory experiment characterized the changes in sensitivity to desiccation that occur as mussels increase in size. Mussels became highly tolerant to desiccation when they reached a size of 2 to 3 mm SL. This size closely corresponds to the size at which juvenile M. trossulus relocate from protective filamentous algal habitat to adult habitat, suggesting ontogenetic shifts in habitat use by juvenile M. trossulus are a response to changing sensitivity to desiccation. If so, the future survival of newly settled mussels, and thus possibly the local persistence of mussel populations, may depend upon the persistence of protective algal microhabitats under changing climate conditions.
机译：我们检查了新定殖的Mytilus trossulus对热和干燥的敏感性，以及在底栖初期的敏感性。进行实验室实验以确定贻贝对现场所经历的整个温度范围和干燥水平的敏感性。壳长为1到2毫米的贻贝在34℃时经历了耐热性阈值，而在蒸气压不足水平为1.01 kPa时经历了干燥耐性阈值。在加拿大不列颠哥伦比亚省的巴克利桑德，新定居的粉刺支原体长期处于达到或超过致死水平的温度相对很少，而致死的干燥水平通常在征募季节发生，通常持续数小时。因此，干燥对新近定殖的青霉菌的威胁似乎要比加热更大。最终的实验室实验表征了随着贻贝尺寸的增加，对干燥敏感性的变化。当贻贝达到2至3毫米SL的大小时，它们便变得高度耐受干燥。该大小与少年M. trossulus从保护性丝状藻类生境迁移到成年生境的大小非常吻合，这表明少年M. trosssulus在栖息地使用中的个体发生变化是对干燥敏感性变化的响应。如果这样，新定居的贻贝的未来生存以及贻贝种群的局部持久性可能取决于气候条件不断变化下的保护性藻类微生境的持久性。

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