Mixotrophy and intraguild predation – dynamic consequences of shifts between food web motifs
Mixotrophy and intraguild predation – dynamic consequences of shifts between food web motifs
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混合营养和群体内捕食——食物网主题之间转变的动态后果
DOI：
10.1140/epjst/e2017-70033-5
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Sabine Wollrab
中科院分区：
文献类型：
--
作者：
R. Karnatak;Sabine Wollrab
混合营养在水生系统的微生物群落中普遍存在，许多鞭毛虫能够利用自养和异养途径获取能量。一种途径在另一种途径上的使用与资源可用性有关，可选途径的耦合对系统稳定性有很强的影响。我们研究了与相对资源可用性相关的不同能量途径的优势对系统动力学的影响。这个基序是由一个混合营养体捕食一个纯粹自养的物种，同时竞争共享资源。此外，自养生物可以利用额外的专属食物来源。通过改变共享与独占食物来源的相对丰度，我们将食物网基序从一个内部捕食基序转变为一个食物链基序。我们分析了系统动力学对绝对资源可用性和相对资源可用性的依赖性。总的来说，随着养分有效性的增加，系统表现出从稳定到振荡的转变。然而，这种转变发生在食物链的营养水平远低于在野生动物捕食motif。在不同营养水平的食物来源相对丰度的变化中也观察到类似的转变。我们预计这种食物网基序的转变在微生物群落中经常发生，因此我们的研究结果与自然系统高度相关。
Mixotrophy is ubiquitous in microbial communities of aquatic systems with many flagellates being able to use autotroph as well as heterotroph pathways for energy acquisition. The usage of one over the other pathway is associated with resource availability and the coupling of alternative pathways has strong implications for system stability. We investigated the impact of dominance of different energy pathways related to relative resource availability on system dynamics in the setting of a tritrophic food web motif. This motif consists of a mixotroph feeding on a purely autotroph species while competing for a shared resource. In addition, the autotroph can use an additional exclusive food source. By changing the relative abundance of shared vs. exclusive food source, we shift the food web motif from an intraguild predation motif to a food chain motif. We analyzed the dependence of system dynamics on absolute and relative resource availability. In general, the system exhibits a transition from stable to oscillatory dynamics with increasing nutrient availability. However, this transition occurs at a much lower nutrient level for the food chain in comparison to the intraguild predation motif. A similar transition is also observed with variations in the relative abundance of food sources for a range of nutrient levels. We expect this shift in food web motifs to occur frequently in microbial communities and therefore the results from our study are highly relevant for natural systems.
DOI：
10.1137/0910062
发表时间：
1989-09-01
期刊：
SIAM JOURNAL ON SCIENTIFIC AND STATISTICAL COMPUTING
影响因子：
--
作者：
BROWN, PN;BYRNE, GD;HINDMARSH, AC
通讯作者：
HINDMARSH, AC
DOI：
10.1073/pnas.1517118113
发表时间：
2016-03-15
影响因子：
11.1
作者：
Ward, Ben A.;Follows, Michael J.
通讯作者：
Follows, Michael J.