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Body size constrains maternal investment in a small sea turtle species
Marine Biology ( IF 2.4 ) Pub Date : 2020-11-04 , DOI: 10.1007/s00227-020-03795-7
Christopher R. Gatto , Nathan J. Robinson , James R. Spotila , Frank V. Paladino , Pilar Santidrián Tomillo

To maximise reproductive fitness, species make trade-offs among reproductive traits, e.g., offspring quantity vs. offspring size, within energetic, anatomical, and physiological constraints. Sea turtles are a model taxon to study reproductive trade-offs, because they lack parental care and because there are strong selective pressures on hatchlings due to high predation rates. Natural selection therefore typically favours optimising offspring size over offspring quantity. Nevertheless, the balance between these traits varies between both sea turtle populations and species. Here, we quantified individual variation in reproductive traits of olive ridley turtles (Lepidochelys olivacea) in northwest Costa Rica. Olive ridley females displayed considerable inter-female variation in reproductive traits with larger females producing larger clutches. These larger females also produced longer and heavier hatchlings than smaller females despite producing similar sized eggs. Females did not exhibit a trade-off between clutch size and egg mass, although variation in clutch size (coefficient of variation = 16.8%) was greater than that of egg mass (10.1%). Producing more eggs per clutch had 1.8 times the effect of producing heavier eggs at increasing clutch mass. The effect of clutch frequency was 2.5 times that of clutch size on seasonal egg production and 2.4 times that of clutch size on seasonal hatchling production. In conclusion, olive ridley turtles exhibit considerable variation in reproductive traits, but their small body size constrains clutch size and has implications for their overall reproductive output.

中文翻译:

体型限制了母体对小型海龟物种的投资

为了最大限度地提高繁殖适应性,物种在能量、解剖和生理限制内在繁殖特性之间进行权衡,例如后代数量与后代大小。海龟是研究生殖权衡的模型类群,因为它们缺乏父母的照顾,并且由于高捕食率对幼龟有很强的选择压力。因此,自然选择通常倾向于优化后代大小而不是后代数量。然而,这些特征之间的平衡因海龟种群和物种而异。在这里,我们量化了哥斯达黎加西北部橄榄海龟(Lepidochelys olivacea)生殖特征的个体差异。Oliveridley 雌性在生殖性状方面表现出相当大的雌性间差异,较大的雌性产生更大的离合器。尽管产生相似大小的卵,这些较大的雌性也比较小的雌性产生更长、更重的幼龟。雌性没有表现出离合器大小和鸡蛋质量之间的权衡,尽管离合器大小的变化(变异系数 = 16.8%)大于鸡蛋质量的变化(10.1%)。每窝生产更多鸡蛋的效果是在增加离合器质量时生产更重鸡蛋的效果的 1.8 倍。离合器频率对季节性蛋产量的影响是离合器尺寸的2.5倍,对季节性孵化产量的影响是离合器尺寸的2.4倍。总之,橄榄海龟在生殖特征上表现出相当大的差异,但它们的小​​体型限制了离合器的大小,并对它们的整体生殖输出产生了影响。
更新日期:2020-11-04
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