Decomposing predation: testing for parameters that correlate with predatory performance by a social bacterium.
Decomposing predation: testing for parameters that correlate with predatory performance by a social bacterium.
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DOI：
10.1007/s00248-012-0135-6
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发表时间：
2013-02
影响因子：
3.6
通讯作者：
Velicer, Gregory J.
中科院分区：
文献类型：
--
作者：
Mendes-Soares, Helena;Velicer, Gregory J.
捕食者与被捕食者的相互作用可能在塑造微生物群落的组成和动态方面发挥着重要作用。然而，人们对这种相互作用的群体生物学或捕食相关参数如何在猎物环境中变化或关联的了解甚少。黄色粘球菌是一种能运动的土壤细菌，以多种其他土壤微生物为食，这些微生物对黄色粘球菌生长的支持程度差异很大。为了在种群水平上分解捕食者与被捕食者的相互作用，我们量化了 M. xanthus 在九种系统发育上不同的细菌猎物物种上生长期间的五个捕食相关参数。由猎物草坪推动的成群捕食者群体的水平扩张率是我们衡量整体捕食性能的指标，因为它包含了捕食的搜索（运动性）和处理（杀死和消耗猎物）组成部分。其他四个参数——捕食者种群增长率、最大捕食者产量、最大猎物杀死率和猎物总体死亡率——是在均匀混合的捕食者-猎物草坪上测量的，在该草坪上捕食者种群不允许通过集群运动水平扩展。所有猎物物种都促进了捕食者数量的增长。对于某些猎物，捕食者特异性猎物死亡与捕食者种群增长同时发生，而其他猎物物种的死亡仅在捕食者生长停止后才检测到。发现所有四个替代参数都在不同程度上与捕食者群体扩张率显着相关，表明这些不同的捕食措施之间存在因果关系。更广泛地说，我们的结果强调了检查多个参数对于彻底了解微生物捕食的种群生物学的重要性。
Predator-prey interactions presumably play major roles in shaping the composition and dynamics of microbial communities. However, little is understood about the population biology of such interactions or how predation-related parameters vary or correlate across prey environments. Myxococcus xanthus is a motile soil bacterium that feeds on a broad range of other soil microbes that vary greatly in the degree to which they support M. xanthus growth. In order to decompose predator-prey interactions at the population level, we quantified five predation-related parameters during M. xanthus growth on nine phylogenetically diverse bacterial prey species. The horizontal expansion rate of swarming predator colonies fueled by prey lawns served as our measure of overall predatory performance, as it incorporates both the searching (motility) and handling (killing and consumption of prey) components of predation. Four other parameters – predator population growth rate, maximum predator yield, maximum prey kill, and overall rate of prey death – were measured from homogeneously mixed predator-prey lawns from which predator populations were not allowed to expand horizontally by swarming motility. All prey species fueled predator population growth. For some prey, predator-specific prey death was detected contemporaneously with predator population growth, whereas killing of other prey species was detected only after cessation of predator growth. All four of the alternative parameters were found to correlate significantly with predator swarm expansion rate to varying degrees, suggesting causal inter-relationships among these diverse predation measures. More broadly, our results highlight the importance of examining multiple parameters for thoroughly understanding the population biology of microbial predation.
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DOI：
10.1111/j.1749-6632.1987.tb40611.x
发表时间：
1987-07-09
影响因子：
5.2
作者：
GUERRERO, R;ESTEVE, I;GAJU, N
通讯作者：
GAJU, N
影响因子：
2.9
作者：
Hall, SR;Duffy, MA;Cáceres, CE
通讯作者：
Cáceres, CE
影响因子：
23.8
作者：
HOLLING, CS
通讯作者：
HOLLING, CS
影响因子：
11.3
作者：
Berleman JE;Kirby JR
通讯作者：
Kirby JR
影响因子：
2.9
作者：
LENSKI, RE;ROSE, MR;TADLER, SC
通讯作者：
TADLER, SC