CONSERVED ONTOGENY AND ALLOMETRIC SCALING OF RESOURCE ACQUISITION AND ALLOCATION IN THE DAPHNIIDAE
CONSERVED ONTOGENY AND ALLOMETRIC SCALING OF RESOURCE ACQUISITION AND ALLOCATION IN THE DAPHNIIDAE
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DOI：
10.1111/j.0014-3820.2005.tb01016.x
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发表时间：
2005-03
期刊：
影响因子：
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通讯作者：
J. L. Dudycha;M. Lynch
中科院分区：
文献类型：
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作者：
J. L. Dudycha;M. Lynch
摘要生活史在类群之间差异很大，但在系统发育组中，可能有一个基本的框架，围绕这个框架组织性状变异，这可能是特定谱系发育限制的结果。在具有不确定生长的生物体中，存在一个持续的问题，即在生长和繁殖之间最优地分配资源，并且该分配决策可以通过异速生长标度来表现自己。先前对淡水浮游动物的研究表明，个体发育的资源分配模式可以用简单的数学函数来描述。了解这些功能如何解释生活史变化的一个重要组成部分是发现这些功能中的哪些参数是强大的，相对于资源的可用性和进化的多样化，以及哪些参数表现出种间异速生长。为了阐明这些问题，详细的生命表实验进行了8种在家庭Daphniidae（甲壳纲）在高和低水平的资源。使用数据的增长，繁殖，和龄期的持续时间，个体发育的资源分配的增长和繁殖可以被描述为功能，高原或成熟后不久开始。为了确保结果不是系统发育结构的伪影，以遗传学控制的方式测试参数。结果表明，一组简单的资源分配规则的daphniids，即所有物种表现出类似形式的个体发育变化的分配，并达到一个高原，约94%的可用资源分配给生殖。渐近最大速率的净资源纳入生长和繁殖是正相关的大小在成熟期，而速率的方法高原（净资源同化和比例分配到繁殖）呈负相关的身体大小。每个后代的投资是正相关的平方根大小在成熟。使用这种方法，广泛的种间变化的生活史功能可以与一个单一的基本特征，在第一次生殖投资的大小。
Abstract Life histories vary widely among taxa, but within phylogenetic groups there may be a fundamental framework around which trait variation is organized, perhaps as a consequence of lineage-specific developmental constraints. In organisms with indeterminate growth, there is an ongoing problem of optimally allocating resources between growth and reproduction, and that allocation decision may manifest itself through allometric scaling. Previous work on freshwater zooplankton has shown that the ontogenetic pattern of resource allocation can be described by simple mathematical functions. An important component of understanding how such functions can explain life-history variation is to discover which parameters in these functions are robust, with respect to both resource availability and evolutionary diversification, and which parameters exhibit interspecific allometry. To shed light on these issues, detailed life table experiments were conducted on eight species in the family Daphniidae (Crustacea) at high and low levels of resources. Using data on growth, reproduction, and instar duration, the ontogeny of resource allocation to growth and reproduction could be described as functions that plateau at or shortly after the onset of maturity. To be sure that the results were not an artifact of phylogenetic structure, the parameters were tested in a phylogenetically controlled fashion. The results suggest a simple set of resource allocation rules for daphniids, whereby all species exhibit a similar form of ontogenetic change in allocation, and reach a plateau where approximately 94% of available resources are allocated to reproduction. The asymptotically maximal rate of net resources incorporated in growth and reproduction was positively related to size at maturity, whereas the rates of approach to plateaus (for both net resource assimilation and proportional allocation to reproduction) were negatively related to body size. Per-offspring investment was positively related to the square root of size at maturity. Using this approach, a wide range of interspecific variation in life-history features can be related to a single underlying trait, the size at first reproductive investment.