Assessing hybrid vigour using the thermal sensitivity of physiological trade‐offs in tiger salamanders
Assessing hybrid vigour using the thermal sensitivity of physiological trade‐offs in tiger salamanders
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利用虎蝾螈生理权衡的热敏感性评估杂交活力
DOI：
10.1111/1365-2435.14463
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发表时间：
2023
影响因子：
5.2
通讯作者：
Riddell, Eric A.
中科院分区：
文献类型：
--
作者：
Burger, Isabella J.;Carter, Evin T.;Magner, Lexie M.;Muñoz, Martha M.;Sears, Michael W.;Fitzpatrick, Benjamin M.;Riddell, Eric A.
物种间的杂交在许多方面影响着生物多样性和种群的可持续性，其中许多方面取决于杂交种相对于亲本物种的适应性。与亲本谱系相比，杂交种可以表现出更合适的表型，这种“杂交活力”可能导致一个或两个亲本谱系的灭绝。在本研究中，我们分析了三种基因型虎蝾螈——本地加利福尼亚虎蝾螈（CTS）、入侵横斑虎蝾螈（BTS）和CTS × BTS杂交虎蝾螈（CTS × BTS）在不同温度（13.5°C、20.5°C和23.5°C）下的生理表现，并比较了水分损失和气体交换之间的关系。我们提出了一个新的性能指标——水气交换比（WGER），我们将其定义为气体交换与蒸发失水的比率（μLVO2/μL H2O）。该比率描述了生物体支持高水平气体交换的高能量活动的能力，同时限制水分流失以降低干燥风险。采用流量呼吸法测定各基因型蝾螈代谢率的热敏性和抗失水能力，比较各基因型蝾螈生理性能指标。我们发现温度对代谢率和抗失水能力有显著影响，随着温度的升高，这两项性状都有所增加。在不同的基因型中，我们发现杂种的WGER高于原生CTS，这是因为杂种的代谢率更高，尽管对水分流失的抵抗力较低。这些结果提供了对驱动杂交活力的生理机制的更深入的了解，并为蝾螈杂交的快速传播提供了潜在的解释。更广泛地说，我们引入的WGER可能允许在不断变化的环境条件下对物种或谱系范围内的生理性能进行比较，强调可以从生物体性能的多性状分析中收集到的见解。在《华尔街日报》博客上阅读免费的《简明语言摘要》。
Hybridization between species affects biodiversity and population sustainability in numerous ways, many of which depend on the fitness of the hybrid relative to the parental species. Hybrids can exhibit fitter phenotypes compared to the parental lineages, and this ‘hybrid vigour’ can then lead to the extinction of one or both parental lines.In this study, we analysed the relationship between water loss and gas exchange to compare physiological performance among three tiger salamander genotypes—the native California tiger salamander (CTS), the invasive barred tiger salamanders (BTS) and CTS × BTS hybrids across multiple temperatures (13.5°C, 20.5°C and 23.5°C). We developed a new index of performance, the water‐gas exchange ratio (WGER), which we define as the ratio of gas exchange to evaporative water loss (μLVO2/μL H2O). The ratio describes the ability of an organism to support energetically costly activities with high levels of gas exchange while simultaneously limiting water loss to lower desiccation risk. We used flow through respirometry to measure the thermal sensitivity of metabolic rate and resistance to water loss of each salamander genotype to compare indices of physiological performance.We found that temperature had a significant effect on metabolic rate and resistance to water loss, with both traits increasing as temperatures warmed. Across genotypes, we found that hybrids have a higher WGER than the native CTS, owing to a higher metabolic rate despite having a lower resistance to water loss.These results provide a greater insight into the physiological mechanisms driving hybrid vigour and offer a potential explanation for the rapid spread of salamander hybrids. More broadly, our introduction of the WGER may allow for species‐ or lineage‐wide comparisons of physiological performance across changing environmental conditions, highlighting the insight that can be gleaned from multitrait analysis of organism performance.Read the free Plain Language Summary for this article on the Journal blog.
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影响因子：
3.5
作者：
Adavoudi R;Pilot M
通讯作者：
Pilot M
脊椎动物体皮水屏障的可塑性
DOI：
--
发表时间：
2004
期刊：
影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
B. Wolf
影响因子：
30.7
作者：
Becker, Matthias;Gruenheit, Nicole;Lockhart, Peter J.
通讯作者：
Lockhart, Peter J.
影响因子：
4.9
作者：
Frankham, Richard
通讯作者：
Frankham, Richard