How do organisms change size with changing temperature? The importance of reproductive method and ontogenetic timing
How do organisms change size with changing temperature? The importance of reproductive method and ontogenetic timing
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DOI：
10.1111/j.1365-2435.2011.01852.x
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发表时间：
2011-10-01
影响因子：
5.2
通讯作者：
Atkinson, David
中科院分区：
文献类型：
--
作者：
Forster, Jack;Hirst, Andrew G.;Atkinson, David
1.“温度-大小规则”（TSR）是一个广泛观察到的现象，在变温物种：在较低温度下饲养的个体生长较慢，但成年个体比在较温暖的温度下饲养的个体更大。虽然TSR是常见的，并具有广泛的生态重要性，它是不知道是否有一个一般的生理机制，导致TSR或即使物种共享一个类似的模式的热反应在个体发育。我们构建了一个概念模型，表明在暴露于温度变化的单细胞生物中，二进制分裂迫使生长（g）和发育（D）速率恢复到固定的比率。经过一段时间的脱钩在热驯化，这些利率必须恢复，以保持一个固定的比例成人：后代的大小。然而，在不同温度下的多细胞生物中，成体和子代大小之间的关系不需要固定，因此生长和发育速率也不需要有固定的比率。本文对后生动物个体发育对温度的反应数据进行了元分析，结果表明，成体大小对温度的反应比子代大小的反应强得多，并揭示了个体大小反应在其他生活史阶段的差异.这项研究表明，在单细胞和多细胞生物体的TSR的操作的根本差异，这表明，一般的生理机制，导致TSR是不太可能的。我们的研究结果还揭示了分析整个生命周期和跨代大小变化的价值：这些将产生更完整的定量描述，并可能提供为什么身体大小对温度做出反应的线索。
1. The 'temperature-size rule' (TSR) is a widely observed phenomenon within ectothermic species: individuals reared at lower temperatures grow more slowly, but are larger as adults than individuals reared at warmer temperatures. Although the TSR is common and of widespread ecological importance, it is not known whether there is a general physiological mechanism causing the TSR or even if species share a similar pattern of thermal response across ontogeny.2. We constructed a conceptual model to show that binary division forces growth (g) and development (D) rates to return to a fixed ratio in unicellular organisms exposed to a change in temperature. After a period of decoupling during thermal acclimation, these rates must be restored to maintain a fixed ratio of adult: progeny size. However, the relationship between adult and progeny size need not be fixed in multicellular organisms at different temperatures, and hence growth and development rates need not have a fixed ratio either.3. We conducted a meta-analysis on data of metazoan ontogenetic responses to temperature which demonstrates that adult size shows a much stronger temperature-size response than progeny size, and reveals variation in size response among other life cycle phases.4. This study shows fundamental differences in the operation of the TSR in unicellular and multicellular organisms, suggesting that a general physiological mechanism causing the TSR is unlikely. Our findings also reveal the value of analysing shifts in size through the life cycle and across generations: these will yield a more complete quantitative description of how, and potentially provide clues to why, body size responds to temperature.