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首页> 外文期刊>Marine ecology progress series >Intraspecific variation in larval size and its effects on juvenile lophophore size in four bryozoans
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Intraspecific variation in larval size and its effects on juvenile lophophore size in four bryozoans

机译：四个苔藓虫的幼体大小种内变异及其对幼体荧光团大小的影响

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The quantity of maternal investment per offspring is related to maternal fitness and offspring performance. Some models suggest that maximum maternal fitness occurs when mothers produce offspring of a single optimal size (size being a proxy of maternal investment). However, there is substantial intraspecific variation in offspring size, especially in species with lecithotrophic larvae. For most species, the level at which this variation occurs (within vs. among brood) is unclear. We quantified variation in larval size within and among broods for 4 species of bryozoans with lecithotrophic larvae. Larval size was highly variable in all species, and the majority of the variation was found within broods for 3 of the 4 species. In all 4 species, sibling larvae varied up to 2-fold in volume. Further, there were strong positive relationships between initial larval size and juvenile lophophore size for all 4 species. Lophophore size is related to feeding ability, so variation in larval size may result in variation in feeding ability among sibling juveniles. These results offer a probable mechanism for the positive relationship between initial larval size and colony growth rate in bryozoans.
机译：每个后代的母体投资数量与母体健康和后代表现有关。一些模型表明，当母亲生产单个最佳尺寸的后代（尺寸是母亲投资的代名词）时，孕产妇的最大适应性就会发生。但是，后代的种内存在明显的种内变异，特别是在具有营养缺陷型幼虫的物种中。对于大多数物种，这种变化发生的水平（在巢内还是在巢之间）尚不清楚。我们定量了4种带营养性幼虫的苔藓虫的巢内和巢内幼体大小的变化。在所有物种中，幼虫的大小变化很大，并且在4种物种中有3种在亲鱼中发现了大部分变异。在所有4种中，同胞幼虫的体积最多变化2倍。此外，所有4个物种的初始幼体大小与幼体荧光团大小之间都具有很强的正相关关系。荧光团的大小与摄食能力有关，因此幼虫大小的变化可能会导致同胞少年之间摄食能力的变化。这些结果提供了一种可能的机制，用于在幼虫中初始幼体大小与菌落生长速率之间呈正相关。

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