Eye‐body allometry across biphasic ontogeny in anuran amphibians

Eye‐body allometry across biphasic ontogeny in anuran amphibians
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无尾两栖动物双相个体发育的眼体异速生长

DOI:
10.1007/s10682-021-10102-3
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发表时间:
2021
期刊:
Elements in evolutionary economics
影响因子:
--
通讯作者:
Thomas, K. N.
Thomas, K. N.
中科院分区:
--
文献类型:
--
作者:
Shrimpton, S. J.;Streicher, J. W.;Gower, D. J.;Bell, R. C.;Fujita, M. K.;Schott, R. K.;Thomas, K. N.

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具有双相生命周期的动物在个体发育过程中经常生活在不同的视觉环境中。许多青蛙和蟾蜍(两栖纲:无尾两栖动物)都有自由生活的水生幼虫(蝌蚪),这些幼虫会蜕变成成虫,生活在各种水生和陆地环境中。生态差异影响不同物种的眼睛大小,但这些关系尚未在个体发育异速生长背景下跨生命阶段进行探索。我们研究了一种有水生幼虫和陆生成虫的物种--常见的蛙类--眼体大小的比例,使用了一系列采样充分的发育序列。我们发现个体发育异速生长轨迹在变态附近发生了变化,这表明蝌蚪的眼睛优先生长。为了探索不同的蝌蚪和成体生态对眼体比例的影响,我们扩大了分类样本,包括另外11种无尾两栖动物的发育系列。种内眼体比例在不同物种之间是不同的,有8/12物种在蝌蚪和成虫之间的异速生长斜率有显著变化。跨物种的蝌蚪生态(微生境、眼位、嘴位)和成虫生态(生境、活动模式)的性状对蝌蚪间的异速生长斜率有显著影响,但只有蝌蚪的眼位对成虫的异速生长斜率有显著影响。我们的研究表明,在双相无尾两栖动物个体发育的初始阶段,眼睛的相对生长在某种程度上是分离的,可能受到直接的生态需求(即蝌蚪的视觉需求)和对成年后期有利的因素的影响。
Animals with biphasic lifecycles often inhabit different visual environments across ontogeny. Many frogs and toads (Amphibia: Anura) have free-living aquatic larvae (tadpoles) that metamorphose into adults that inhabit a range of aquatic and terrestrial environments. Ecological differences influence eye size across species, but these relationships have not yet been explored across life stages in an ontogenetic allometric context. We examined eye-body size scaling in a species with aquatic larvae and terrestrial adults, the common frogRana temporaria, using a well-sampled developmental series. We found a shift in ontogenetic allometric trajectory near metamorphosis indicating prioritized growth in tadpole eyes. To explore the effects of different tadpole and adult ecologies on eye-body scaling, we expanded our taxonomic sampling to include developmental series of eleven additional anuran species. Intraspecific eye-body scaling was variable among species, with 8/12 species exhibiting a significant change in allometric slope between tadpoles and adults. Traits categorizing both tadpole ecology (microhabitat, eye position, mouth position) and adult ecology (habitat, activity pattern) across species had significant effects on allometric slopes among tadpoles, but only tadpole eye position had a significant effect among adults. Our study suggests that relative eye growth in the preliminary stages of biphasic anuran ontogenies is somewhat decoupled and may be shaped by both immediate ecological need (i.e. tadpole visual requirements) and what will be advantageous during later adult stages.
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