Rotifer resting egg densities in lakes of different trophic state, and their assessment using emergence and egg counts.
Rotifer resting egg densities in lakes of different trophic state, and their assessment using emergence and egg counts.
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不同营养状态湖泊中轮虫静息卵密度及其利用出苗率和卵数的评估。
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
R. Shiel
中科院分区：
文献类型：
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作者：
I. Duggan;John D. M. Green;R. Shiel
估计轮虫休眠卵密度从湖泊沉积物的方法，并使用的出现，确定从湖泊的群落组成，在湖Tikitapu和Okaro，新西兰进行了调查。通过监测孵化沉积物中的羽化率获得的休眠卵密度估计值显著低于（P<0.01）卵计数。然而，孵化的沉积物并不需要能够识别物种的基础上，鸡蛋形态的鸡蛋计数。富营养化的Okaro湖沉积物中的休眠卵密度显著高于贫-中营养化的Tikitapu湖。沉积物的孵化并没有导致浮游生物中发现的所有物种在早期的13个月的季节性调查中出现，包括一些常见的物种。目前，这限制了这种方法作为快速评估群落组成的工具的使用。然而，如果只可能对一个地点进行一次访问，该方法可能会提供更完整的物种列表，从而比一些传统方法（例如垂直网牵引）具有优势。
The methods for estimating rotifer resting egg densities from lake sediment, and the use of emergence for determining community composition from lakes, were investigated in Lakes Tikitapu and Okaro, New Zealand. Significantly lower (P<0.01) estimates of resting egg densities were obtained by monitoring emergence from incubated sediments than from egg counts. However, incubation of sediments did not require the ability to recognise species on the basis of egg morphology as did egg counts. Significantly higher (P<0.01) densities of resting eggs were found in sediments from eutrophic Lake Okaro than from oligo-mesotrophic Lake Tikitapu. Incubation of sediments did not result in the emergence of all species found in the plankton during an earlier thirteen-month seasonal survey, including some common species. This currently limits the use of this method as a tool for rapid assessment of community composition. However, the method is likely to provide advantages over some traditional methods, such as vertical net hauls, by providing more complete species lists if only a single visit to a site is possible.