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首页> 外文期刊>Marine ecology >A matter of tolerance: Distribution potential of scyphozoan polyps in a changing environment
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A matter of tolerance: Distribution potential of scyphozoan polyps in a changing environment

机译：宽容的问题：不断变化的环境中的子甲虫息肉的分布潜力

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摘要

Jellyfish blooms are unpredictable, unsustainable events, frequently affecting aquatic ecosystems severely. Of particular interest are the consequences of environmental change for jellyfish populations, especially in semi-enclosed habitats. Regional and seasonal changes in water chemistry and physics may control the distribution of sessile polyps in the Baltic Sea, hence potentially driving the population dynamics of the two abundant medusa species Aurelia aurita and Cyanea capillata (Scyphozoa, Cnidaria). In laboratory experiments, settlement, growth, survival and physiological condition of A.aurita polyps were investigated at different levels of water temperature, pH and salinity. Survival and physiological condition of C.capillata polyps were examined after exposure to low salinity levels. Increased settlement of A.aurita planula larvae was observed on substrate plates at low temperature (4 degrees C), low pH (7.4) and low salinity (7.5psu), whereas early polyp growth was constrained by salinity <= 10 psu. Aurelia aurita polyps were in good physiological condition over the whole temperature range, while exposure to pH <6.5 led to stepwise tissue degradation. Salinity reduction to <= 5 and <= 8 psu caused irreversible degeneration of A.aurita and C.capillata polyps, respectively. Observed physiological limits suggest distribution of polyp populations of A.aurita in central and of C.capillata in western parts of the Baltic Sea, while future climate changes may particularly restrict occurrence of the less tolerant C.capillata.
机译：水母开花是不可预测的，不可持续的事件，经常严重影响水生生态系统。特别令人关注的是环境变化对水母种群的影响，特别是在半封闭的栖息地。水化学和物理的区域性和季节性变化可能控制了无性息肉在波罗的海的分布，因此潜在地驱动了两个丰富的水母物种Aurelia aurita和Cyanea capillata（Scyphozoa，Cnidaria）的种群动态。在实验室实验中，研究了在不同水温，pH和盐度下金黄色葡萄球菌息肉的沉降，生长，存活和生理状况。暴露于低盐度水平后检查了毛细线虫息肉的存活和生理状况。在低温（4摄氏度），低pH（7.4）和低盐度（7.5psu）的底物板上观察到金黄色葡萄球菌幼虫的沉降增加，而盐度<= 10 psu限制了息肉的早期生长。在整个温度范围内，Aurlia aurita息肉都处于良好的生理状态，而暴露于pH <6.5则导致组织逐步降解。盐度降低到<= 5和<= 8 psu分别导致了金黄色葡萄球菌和毛细囊藻的不可逆退化。观察到的生理极限表明波罗的海中部的金黄色葡萄球菌的息肉种群和波罗的海西部的毛细线虫的分布，而未来的气候变化可能会特别限制耐受性较弱的毛细线虫的发生。

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