The Effect of Pregnancy On Metabolic Scaling and Population Energy Demand in the Viviparous Fish Gambusia affinis
The Effect of Pregnancy On Metabolic Scaling and Population Energy Demand in the Viviparous Fish Gambusia affinis
复制标题
妊娠对胎生鱼代谢规模和群体能量需求的影响
DOI：
10.1093/icb/icac099
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发表时间：
2022
影响因子：
2.6
通讯作者：
Simon, K. S.
中科院分区：
文献类型：
--
作者：
Moffett, Emma R.;Fryxell, David C.;Benavente, J. N.;Kinnison, M. T.;Palkovacs, E. P.;Symons, C. C.;Simon, K. S.
新陈代谢是所有生物体的基本属性，它影响着物种如何影响和被其自然环境影响。在异温物种中，两性之间的差异可能会极大地改变代谢比例模式，特别是在胎生或活产物种中，雌性必须支持其基础代谢成本和胚胎的代谢成本。事实上，如果怀孕与代谢需求的显著增加和性别之间的比例模式的改变有关，这反过来又可能与自然界的自然性别比变化相互作用，从而影响人口水平的能量需求。在这里，我们的目的是了解性别和怀孕如何影响代谢缩放，以及性别差异如何影响affinis（西方食蚊鱼）的能量需求。采用相同的方法，我们在野外和实验室分别测量了生殖活跃鱼的常规代谢率。我们的数据表明，与怀孕相关的能量消耗的变化可能导致女性（b= 0.750）比男性（b= 0.595）更陡峭的缩放系数。相比之下，处女雌鱼和雄鱼有相似的缩放系数，这表明在不繁殖的鱼类中，代谢成本的性别差异可以忽略不计。此外，我们的数据表明，在异速缩放中纳入性别差异可能会改变种群水平的能量需求高达20-28%，其中在男性偏倚的种群中，由于男性的缩放系数较低，变化最为明显。总的来说，我们的数据表明，由怀孕驱动的两性生殖能量投入的差异可能会改变异速缩放和种群水平的能量需求。
Metabolism is a fundamental attribute of all organisms that influences how species affect and are affected by their natural environment. Differences between sexes in ectothermic species may substantially alter metabolic scaling patterns, particularly in viviparous or live-bearing species where females must support their basal metabolic costs and that of their embryos. Indeed, if pregnancy is associated with marked increases in metabolic demand and alters scaling patterns between sexes, this could in turn interact with natural sex ratio variation in nature to affect population-level energy demand. Here, we aimed to understand how sex and pregnancy influence metabolic scaling and how differences between sexes affect energy demand inGambusia affinis(Western mosquitofish). Using the same method, we measured routine metabolic rate in the field on reproductively active fish and in the laboratory on virgin fish. Our data suggest that changes in energy expenditure related to pregnancy may lead to steeper scaling coefficients in females (b= 0.750) compared to males (b= 0.595). In contrast, virgin females and males had similar scaling coefficients, suggesting negligible sex differences in metabolic costs in reproductively inactive fish. Further, our data suggest that incorporating sex differences in allometric scaling may alter population-level energy demand by as much as 20–28%, with the most pronounced changes apparent in male-biased populations due to the lower scaling coefficient of males. Overall, our data suggest that differences in energy investment in reproduction between sexes driven by pregnancy may alter allometric scaling and population-level energy demand.