Growth rate is temperature‐dependent, but the proportion of resource allocation between the growth and gonads is not, in early adult stage of the lancelet Branchiostoma japonicum.
Growth rate is temperature‐dependent, but the proportion of resource allocation between the growth and gonads is not, in early adult stage of the lancelet Branchiostoma japonicum.
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文昌鱼成虫早期，生长速度与温度相关，但生长与性腺之间的资源分配比例则不相关。
DOI：
10.1111/maec.12628
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Y.
中科院分区：
文献类型：
--
作者：
Takeshita;F.;Maekawa;T.;& Henmi;Y.
资源分配到多个生活史性状的模式会随着环境的变化而变化；例如，高温通常有利于生长。由于温度而导致的对生长的投资变化可能会改变对其他性状的分配，而这些性状是与温度相权衡的。本文研究了日本branchiostoma japonicum在生长和繁殖之间的权衡，以及分配给这两者的比例是否随着海水温度的升高而变化。实验采用对照、+ 1°C和+ 2°C三种不同温度处理，在实验室饲养了427天。虽然起始时的总体长在不同处理之间没有差异，但长度受到经过天数和温度处理之间的相互作用的影响，这表明生长速率是温度依赖性的；在较高温度条件下，叶片的生长速度明显快于对照条件。在整个繁殖季节，有性腺的个体的频率在不同的处理之间没有差异。尽管性腺的存在会导致月生长增量的降低，但温度处理对月生长增量的影响也不显著。此外，温度处理的影响也很显著。这些结果表明，温度的变化不会改变生长和繁殖之间的平衡分配模式，而高温只会导致资源摄入量的增加，至少在该物种的成年早期是这样。
The pattern of resource allocation into multiple life‐history traits can vary with the environment; for example, high temperatures generally facilitate growth. Changes in investment in growth due to temperature may alter the allocation to other traits that are in trade‐off with that. Here, we investigated the trade‐off between growth and reproduction and whether the proportion of allocation to these varies with increasing seawater temperature in the lanceletBranchiostoma japonicum. We reared the lancelets of early adult stage under three different temperature treatments (control, + 1°C and + 2°C treatments) for 427 days in the laboratory. Although the total body length at initiation did not differ between treatments, the length was influenced by the interaction between elapsed days and temperature treatments, suggesting that growth rate was temperature‐dependent; the lancelets under higher temperature conditions showed a more rapid growth rate than did those under the control conditions. The frequency of individuals with gonads did not differ between treatments throughout their reproductive season. The monthly growth increments were also not significantly affected by the interaction between the presence/absence of gonads and temperature treatments, although the presence of gonads caused the growth increments to decrease. In addition, the effect of temperature treatments was significant. These results suggest that changes in temperature did not alter the pattern of allocation between growth and reproduction that were in a trade‐off, whereas high temperature would solely result in an increase in resource intake, at least in the early adult stage of this species.