Key Laboratory of Freshwater Fish Reproduction and Development, Ministry of Education, School of Life Sciences, Southwest University, Chongqing, 400715, China.
J Comp Physiol B. 2021 Jul;191(4):711-719. doi: 10.1007/s00360-021-01365-x. Epub 2021 Apr 3.
Ploidy level affects both the cell size and metabolic rate (MR) of organisms. The present study aimed to examine whether ploidy levels cause differences in cell surface area (SA), MR and metabolic scaling. The resting MR (RMR), red blood cell SA (SA), red blood cell count (RBCC), gill SA (GSA), and ventilation frequency (VF) were measured in diploid and triploid common carp with different body masses (M). The results showed that both M and ploidy level affected the RMR, GSA, VF, and SA, with interactions between M and ploidy level. The triploids had larger SA but lower RBCC than those of the diploids. The SA increased weakly but significantly with increasing M, by an exponent of 0.043, in the triploids but did not increase in the diploids. The RMR of the triploids and diploids scaled with M, by exponents of 0.696 and 1.007, respectively. The RMR was higher in the triploids than the diploids. The GSA scaled with M, with an exponent of 0.906 in the triploids and an exponent of 1.043 in the diploids. The VF scaled with M by an exponent of - 0.305 in the triploids but showed no correlation with M in the diploids. The larger SA and RMR and smaller scaling exponents of both the GSA and VF of the triploids were consistent with the finding that the b was smaller in the triploids than in the diploids. This suggests that the ploidy-induced changes of SA and SA scaling affect the metabolic scaling of fish.
倍性水平影响生物的细胞大小和代谢率（MR）。本研究旨在研究倍性水平是否会导致细胞表面积（SA）、MR 和代谢比例的差异。测量了不同体重（M）的二倍体和三倍体鲤鱼的静息 MR（RMR）、红细胞 SA（SA）、红细胞计数（RBCC）、鳃 SA（GSA）和通气频率（VF）。结果表明，M 和倍性水平均影响 RMR、GSA、VF 和 SA，且 M 和倍性水平之间存在相互作用。三倍体的 SA 较大，但 RBCC 较二倍体低。SA 随 M 呈弱但显著增加，三倍体的指数为 0.043，而二倍体则不增加。三倍体和二倍体的 RMR 与 M 呈比例关系，指数分别为 0.696 和 1.007。三倍体的 RMR 高于二倍体。GSA 与 M 呈比例关系，三倍体的指数为 0.906，二倍体的指数为 1.043。VF 以三倍体的指数为-0.305 与 M 呈比例关系，但在二倍体中与 M 无关。三倍体的较大的 SA 和 RMR 以及较小的 GSA 和 VF 的比例指数与三倍体的 b 小于二倍体的发现一致。这表明，SA 和 SA 比例的倍性诱导变化影响鱼类的代谢比例。
