Cost of reproduction in selected species of zooplankton (rotifers and cladocerans)
Cost of reproduction in selected species of zooplankton (rotifers and cladocerans)
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DOI：
10.1023/a:1021265104165
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发表时间：
2002-08-01
期刊：
影响因子：
2.6
通讯作者：
Gulati, RD
中科院分区：
文献类型：
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作者：
Sarma, SSS;Nandini, S;Gulati, RD
繁殖是一个耗能巨大的生物过程。在淡水浮游动物中，轮虫和枝角动物以孤雌生殖方式繁殖，并且可以使用人口统计研究的生命表数据来估计繁殖成本。当前对后代生产的投资（权衡）导致未来生存或未来繁殖的可能性降低，这是成本假设的中心主题。使用当前繁殖与未来繁殖（称为繁殖成本）或未来生存（称为生存成本）的相关性可用于评估成本假设。在这项工作中，建立了几组相关性：（1）当前繁殖（m（x））与未来生存（整个寿命的l（x + 1），l（x + 2），l（x + 3）等）（生存成本），以及（2）当前繁殖（m（x））与未来繁殖（整个繁殖期间的m（x + 1），m（x + 2），m（x + 3）等）（ 繁殖成本）。这些相关性是针对队列年龄组绘制的，以便量化轮虫（Asplanchna girodi、Brachionus macracanthus、B. variabilis 和 Platyias Quadricornis）和枝角动物（Ceriodaphnia cornuta - 一种维持在小球藻上的菌株，另一种适应微囊藻的菌株）、Carinata 的生存和繁殖成本， D. laevis、Moina macrocopa、Pleuroxus aduncus、Scapholeberis kingi 和 Simocephalus vetulus）。所有测试的轮虫物种的繁殖成本和生存成本的相关系数（当绘制当前繁殖与未来繁殖和未来生存的数据时）均呈现负趋势。然而，从得出的总生存率和繁殖成本来看，前者的84%和后者的42%具有统计显着性。在枝角类动物中，大约 80% 的成本（当前繁殖与未来生存或未来繁殖之间的相关性）为负，表明当前繁殖对测试种群的进一步生存和繁殖产生了负面影响。就统计显着的生存成本而言，枝角类动物表现出略低的趋势（72%），但与轮虫相当。 45% 的病例中，生殖成本非常高。在我们的研究中，简单的统计相关性检测了繁殖和生存之间的权衡。因此，在超过 60% 的情况下，浮游动物的生存和繁殖成本都是负的，我们的数据支持成本假设，在大多数情况下，给定年龄组的浮游动物的繁殖导致下一个年龄组的生存和繁殖减少。
Reproduction is an energetically costly biological process. Among the freshwater zooplankton, rotifers and cladocerans reproduce parthenogenetically and the cost of reproduction can be estimated using the life table data from demographic studies. Reduced probability of future survival or future reproduction as a result of current investment in offspring production (trade-off) is the central theme of the cost hypothesis. Correlations using present reproduction vs. future reproduction ( called the reproductive costs) or future survival ( called the survival costs) can be used to evaluate the cost hypothesis. In this work sets of correlations were made: (1) between present reproduction (m(x)) vs. future survival (l(x+1), l(x+2), l(x+3) etc. for the entire lifespan) ( survival costs), and ( 2) present reproduction (m(x)) vs. future reproduction (m(x+1), m(x+2), m(x+3) etc. for the entire reproductive span) ( reproductive costs). These correlations were plotted against the cohort age-classes in order to quantify survival and reproductive costs in rotifers (Asplanchna girodi, Brachionus macracanthus, B. variabilis and Platyias quadricornis) and cladocerans ( Ceriodaphnia cornuta - one strain maintained on Chlorella and another strain adapted to Microcystis), Daphnia carinata, D. laevis, Moina macrocopa, Pleuroxus aduncus, Scapholeberis kingi and Simocephalus vetulus). All the tested rotifer species showed negative tendency in correlation coefficients ( when the data of current reproduction vs. future reproduction and future survival were plotted) for both reproductive and survival costs. However, from the total survival and reproductive costs derived, 84% of the former and 42% of the latter were statistically significant. In cladocerans about 80% of the costs ( correlations between current reproduction vs. future survival or future reproduction) were negative suggesting that present reproduction had negatively affected both the further survival and reproduction of test populations. In terms of statistically significant survival costs, the cladocerans showed a trend slightly lower (72%) but comparable to rotifers. The reproductive costs were significant in 45% cases. In our study, the simple statistical correlations detected the trade-offs between reproduction and survival. Thus, in more than 60% cases of both survival and reproductive costs in zooplankton were negative, and our data supported the cost hypothesis, in the majority of cases where reproduction by zooplankton of a given age class caused reduced survival and reproduction of the next age class.