Hulbert A J, Hinds D S, MacMillen R E
Comp Biochem Physiol A Comp Physiol. 1985;81(3):687-93. doi: 10.1016/0300-9629(85)91048-5.
Rodents were live-trapped in three environments (desert, intermediate and coastal) in Southern California, USA, chosen because of the taxonomic overlap of species. Upon capture, blood samples were taken and plasma thyroxine concentrations were measured. Four species (Dipodomys merriami, Perognathus fallax, Peromyscus eremicus and Peromyscus californicus) were returned to the laboratory for measurement of minimal and summit rates of metabolism. Heteromyid rodents had significantly lower plasma thyroxine concentrations (14-44 nmol l-1) than cricetid rodents (18-93 nmol l-1). Although there was significant habitat difference in plasma thyroxine levels, this influence was not constant between heteromyid and cricetid rodents. In most species, the desert individuals had the lowest plasma thyroxine concentration. Minimal metabolic rates were lower than expected in all four species, as well as in the tropical heteromyid Liomys salvini and summit metabolic rates were similarly reduced in all species. Upon capture there was considerable variation in plasma thyroxine concentration of different species (23-93 nmol l-1). However, following 10 weeks in captivity, the range and variability of plasma thyroxine levels in these species was considerably reduced (32-64 nmol l-1).
在美国南加州的三种环境（沙漠、中间地带和沿海）中对啮齿动物进行了活体诱捕，选择这三种环境是因为物种的分类重叠。捕获后，采集血样并测量血浆甲状腺素浓度。四种物种（墨氏更格卢鼠、淡色林鼠、荒漠鹿鼠和加州鹿鼠）被带回实验室测量最低代谢率和最高代谢率。异鼠科啮齿动物的血浆甲状腺素浓度（14 - 44纳摩尔/升）显著低于仓鼠科啮齿动物（18 - 93纳摩尔/升）。虽然血浆甲状腺素水平存在显著的栖息地差异，但这种影响在异鼠科和仓鼠科啮齿动物之间并不恒定。在大多数物种中，沙漠个体的血浆甲状腺素浓度最低。所有四个物种的最低代谢率均低于预期，热带异鼠科的萨尔文氏稻鼠也是如此，并且所有物种的最高代谢率同样降低。捕获时，不同物种的血浆甲状腺素浓度存在相当大的差异（23 - 93纳摩尔/升）。然而，在圈养10周后，这些物种血浆甲状腺素水平的范围和变异性大幅降低（32 - 64纳摩尔/升）。
