Niche expansion via acquired metabolism facilitates competitive dominance in planktonic communities
Niche expansion via acquired metabolism facilitates competitive dominance in planktonic communities
复制标题
通过后天代谢进行的生态位扩张促进了浮游生物群落的竞争优势
DOI：
10.1002/ecy.3693
复制
发表时间：
2022
期刊：
影响因子：
4.8
通讯作者：
Moeller, Holly V.
中科院分区：
文献类型：
--
作者：
Hsu, Veronica;Pfab, Ferdinand;Moeller, Holly V.
获得性光养生物是通过宿主内共生体或从猎物中窃取质体来获得光合作用能力的生物体，在水生生态系统中无处不在。这种光合代谢的获得允许利基扩展，因此可以通过减轻对共享资源的竞争来影响竞争结果。在这里，我们测试后天代谢如何通过操纵光的可用性来控制光合作用对后天光养生物的能量贡献来改变竞争结果。利用竞争细菌猎物的淡水原生生物，我们在实验室模型实验中证明了后天光养生物（Paramecium bursaria）和严格异养生物（Colpidiumsp.）的光依赖性竞争结果。然后，我们使用一系列数学模型综合这些发现，并表明明确考虑资源竞争可以提高模型拟合度。经验模型和数学模型都预测，随着光利用率的增加，后天光养生物的竞争优势将会增强。我们的结果强调了获得性代谢对群落动态的重要性，强调需要对这种生态位扩展机制进行更多的实证和理论研究。
Acquired phototrophs, organisms that obtain their photosynthetic abilities by hosting endosymbionts or stealing plastids from their prey, are omnipresent in aquatic ecosystems. This acquisition of photosynthetic metabolism allows for niche expansion, and can therefore influence competition outcomes by alleviating competition for shared resources. Here, we test how acquired metabolism alters competitive outcomes by manipulating light availability to control the energetic contribution of photosynthesis to acquired phototrophs. Using freshwater protists that compete for bacterial prey, we demonstrate light‐dependent competition outcomes of acquired phototrophs (Paramecium bursaria) and strict heterotrophs (Colpidiumsp.) in laboratory model experiments. We then synthesize these findings using a series of mathematical models, and show that explicitly accounting for resource competition improves model fits. Both empirical and mathematical models predict that the acquired phototroph should increase in competitive dominance with increasing light availability. Our results highlight the importance of acquired metabolism to community dynamics, highlighting the need for more empirical and theoretical studies of this mechanism for niche expansion.