Body size of aquatic Quasipaa spinosa does not change with environmental thermal,precipitation and net primary productivity gradients

摘要：

之前的研究发现不同地理种群棘胸蛙(Quasipaa spinosa)的身体大小随着环境生产力以及年最低温的降低而增大,因为更大的身体利于在生产力水平较低的环境中耐受饥饿并利于在寒冷的环境条件下保存热量.然而在种间水平上进行的相关研究发现:由于大部分时间生活在水体这种相对稳定的环境中,水栖性无尾类的身体大小并不受宏观水热波动的影响.为了更好地探究这个问题,我们以棘胸蛙为研究对象,在之前的基础上选择更多的研究地点及更多的环境因子,研究其身体大小的地理分化格局并探究潜在机制.与之前的发现不同,作为一种水栖性无尾类,棘胸蛙的身体大小并不受环境水热梯度以及净初级生产力梯度的影响.导致这种现象的原因可能是水栖性的生境偏好缓和了棘胸蛙受到的来自宏观环境水热波动的影响,所以它们并不通过改变身体大小来适应宏观环境梯度.此外由于棘胸蛙的肉食性,环境初级生产力并不能有效地衡量其食物供给,其身体大小是否受到食物供给量的影响仍有待深入探究.

Previous studies on geographic body size variation of giant spiny frog(Quasipaa spinosa)found that body size of the frog becomes bigger with the decreasing environmental primary productivity and minimum temperature gradients,because bigger body size helps to resist starvation and conserve body energy.However,interspecific studies on size variation of anurans found that body size of aquatic species shows no size variation along the macro thermal or precipitation gradients because water body buffers the selective pressure from macro environmental fluctuation.To have a better insight of this issue,taking giant spiny frog as a focal species based on a previous study,we selected more locations and more environmental predictors to explore the geographic body size variation of the frog and to explore the potential mechanism of observed patterns.We found that unlike the previous study,as an aquatic anuran,giant spiny frog shows a geographic body size variation,but such variation was not caused by environmental thermal or precipitation gradients,nor by primary productivity gradient.The observed pattern may arise due to the species'aquatic lifestyle,which shelters them from the climatic extremes and thus the selective pressures subjected by the external environment.Besides,the giant spiny frog is a carnivorous frog,primary productivity may not work as an estimate of real food supply of the frog,whether or not its body size suffers from the fluctuation of food supply needs further investigation.

作者：

陆鹏飞 陈美珠 高帅 周帅岭 郭程

Lu Pengfei;Chen Meizhu;Gao Shuai;Zhou Shuailing;Guo Cheng(Central South Inventory and Planning Institute of Forestry National and Grassland Administration of P.R.China,Changsha 410014,China;College of Life Science and Technology,Central South University of Forestry&Technology,Changsha 410004,China)

机构地区：

国家林业和草原局中南调查规划设计院 中南林业科技大学生命科学与技术学院

出处：

《betway官方app 学报：自然科学版》 CAS 北大核心 2020年第4期89-95,共7页

基金：

国家自然科学基金(31870509)。

关键词：

棘胸蛙 水栖性 地理分化 水热梯度 净初级生产力

Quasipaa spinosa aquatic anuran geographic variation thermal and precipitation gradients net primary productivity

分类号：

Q954.1 [生物学—动物学]

水栖性的棘胸蛙身体大小不随环境水热梯度及净初级生产力梯度而分化.pdf