Blood variation implicates respiratory limits on elevational ranges of Andean birds-猫眼课题宝

DOI：

10.1086/723222

发表时间：

2021-10

期刊：

bioRxiv

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

E. Linck;J. Williamson;Emil Bautista;Elizabeth J. Beckman;Phred M. Benham;S. DuBay;L. Flores;Chauncey R. Gadek;A. Johnson;Matthew R. Jones;Jano Núñez-Zapata;Alessandra Quiñonez;C. J. Schmitt;D. Susanibar;Tiravanti C. Jorge;K. Verde-Guerra;N. A. Wright;T. Valqui;J. F. Storz;C. Witt

物种范围在多大程度上反映了内在的生理耐受性是进化生态学中一个尚未解决的主要问题。迄今为止，大多数生命之树的实验方法的易处理性有限，阻碍了共识。在这里，我们应用宏观生理学方法来了解与氧运输相关的血液学特征如何影响热带生物多样性热点地区的海拔范围。沿着安第斯山脉海拔梯度，我们测量了 136 种鸟类的 2,355 只个体的影响血液携氧能力的性状——总血红蛋白浓度和细胞血红蛋白浓度以及血细胞比容。我们使用这些数据来评估血液学特征对海拔范围的影响。首先，我们询问血液可塑性是否可以预测海拔范围的宽度。其次，我们询问血液学特征的方差是否随着距海拔范围中点的距离而变化。我们发现血液学可塑性与海拔范围宽度之间呈轻微正相关，这与可塑性在海拔范围扩展中的促进作用一致。我们进一步发现，在海拔范围限制附近和高海拔地区，血液学性状的局部变异减少，这种模式与强化自然选择、有效种群规模减少或其他心脏血液学性状的补偿性变化一致，因为与物种特异性最佳氧利用率的距离越来越远。我们的研究结果表明，血液可塑性的限制和局部遗传对氧气可用性的适应促进了支撑热带山地生物多样性的狭窄海拔范围的进化。

The extent to which species ranges reflect intrinsic physiological tolerances is a major, unsolved question in evolutionary ecology. To date, consensus has been hindered by the limited tractability of experimental approaches across most of the tree of life. Here, we apply a macrophysiological approach to understand how hematological traits related to oxygen transport shape elevational ranges in a tropical biodiversity hotspot. Along Andean elevational gradients, we measured traits that affect blood oxygen-carrying capacity—total and cellular hemoglobin concentration and hematocrit—for 2,355 individuals of 136 bird species. We used these data to evaluate the influence of hematological traits on elevational ranges. First, we asked whether hematological plasticity is predictive of elevational range breadth. Second, we asked whether variance in hematological traits changed as a function of distance from the midpoint of the elevational range. We found that the correlation between hematological plasticity and elevational range breadth was slightly positive, consistent with a facilitative role for plasticity in elevational range expansion. We further found reduced local variation in hematological traits near elevational range limits and at high elevations, patterns consistent with intensified natural selection, reduced effective population size, or compensatory changes in other cardiohematological traits with increasing distance from species-specific optima for oxygen availability. Our findings suggest that constraints on hematological plasticity and local genetic adaptation to oxygen availability promote the evolution of the narrow elevational ranges that underpin tropical montane biodiversity.

Blood variation implicates respiratory limits on elevational ranges of Andean birds

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