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首页> 外文期刊>Marine biology >The utility of statoliths and bell size to elucidate age and condition of a scyphomedusa (Cassiopea sp.)
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The utility of statoliths and bell size to elucidate age and condition of a scyphomedusa (Cassiopea sp.)

机译：针石和钟形大小用于阐明鳞茎水母（Cassiopea sp。）的年龄和状况的效用

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摘要

Scyphomedusae play important roles in marine ecosystems and are of economic significance. However, no reliable techniques for estimating scyphomedusa age have been documented. This study focused on the utility of Cassiopea sp. (Cnidaria: Scyphozoa) statoliths, statocysts, and body size as proxies for age of medusae. Reared medusae of known age and a manipulative experiment were used to assess the accuracy and reliability of four measures of age: number of statoliths, size (diameter) of statoliths, area of statocyst (housing statoliths), and bell diameter. Bell diameter provided the most accurate measure of age under constant conditions, but was increasingly inaccurate under varying environmental conditions. In contrast, the average number of statoliths per medusa reflected age with relatively low accuracy, but did not vary with changes in food availability and salinity. Only temperature influenced the average number of statoliths. Comparisons of bell diameter to the number of statoliths in medusae under low food availability to those fed well showed that the ratio of medusa size to the number of statoliths can be used to recognise medusae that are relatively poorly conditioned. Statoliths, therefore, provide a tool for studying both population ecology and the influence of environmental variation on medusa growth.
机译：鳞茎水母在海洋生态系统中起着重要作用，并且具有经济意义。但是，尚无文献记载估计水纹夜蛾年龄的可靠技术。这项研究侧重于Cassiopea sp。 （刺孢子虫：Scyphozoa）作为石of，水母和体型的代理人，可以作为水母年龄的代名词。饲养已知年龄的水母并进行操纵性实验，以评估四种年龄测量的准确性和可靠性：针石的数量，针石的大小（直径），针囊的面积（壳体的针石）和钟形直径。钟形直径在恒定条件下提供了最准确的年龄度量，但在变化的环境条件下越来越不准确。相比之下，每个美杜莎的平均石笋数量反映的是年龄，准确性相对较低，但不会随食物供应量和盐度的变化而变化。仅温度影响平均层板数。在食物利用率低的情况下，与饲喂良好的水母相比，钟形直径与水母中的阶梯状石数量比较表明，水母大小与阶梯状数的比率可用于识别条件相对较差的水母。因此，石蜡提供了研究种群生态学和环境变化对水母生长的影响的工具。

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  • 来源
    《Marine biology》 |2013年第4期|951-960|共10页
  • 作者

    J. K. Hopf; M. J. Kingsford;

  • 作者单位

    School of Marine and Tropical Biology and ARC Centre of Excellence in Coral Reef Studies, James Cook University, Townsville, Australia;

    School of Marine and Tropical Biology and ARC Centre of Excellence in Coral Reef Studies, James Cook University, Townsville, Australia;

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