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首页> 外文期刊>Oecologia >Interactions among competing nematode species affect population growth rates
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Interactions among competing nematode species affect population growth rates

机译：竞争线虫物种之间的相互作用影响人口增长率

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摘要

Investigations of the interplay of organisms in an ecological community are a prerequisite to understanding the processes that shape the structures of those communities. Among several types of interactions, interest in the positive interactions of species that compete for the same resource has grown, as they may provide a mechanism enabling coexistence. In the laboratory experiment described herein, the effects of interspecific interaction on the population growth of two bacterial-feeding nematode species, Panagrolaimus cf. thienemanni and Poikilolaimus cf. regenfussi, were investigated. Specifically, we asked: (1) whether there is an interspecific interaction between organisms competing for a mutual resource and (2) whether these interactions are altered by the competitors' initial densities and (3) their variable growth rates (induced by different food supplies). Each treatment initially contained 48 nematode individuals, but at different species ratios (48:0; 32:16; 24:24; 16:32; 0:48). The populations were provided with three different bacterial densities (10(8), 10(9), and 10(10) cells ml(-1)) as food. The data were analyzed using a generalized linear mixed model. The best-fitting model revealed a significant decline in population growth rates with an increasing species ratio, but depending on the food density and species. These results provide strong evidence for positive interspecific interactions that vary with both species density and food-supply level. They also suggest important roles for positive interspecific interactions in habitat colonization and in maintaining the coexistence of species in the same trophic group.
机译：对生态社区中生物体相互作用的调查是理解塑造这些社区结构的过程的先决条件。在几种类型的相互作用中，对同一资源竞争的物种的积极相互作用的兴趣已经增长，因为它们可以提供能够共存的机制。在本文描述的实验室实验中，三角形喂养线虫物种群体生长的效应对PanagroLaimus CF的影响。 Thienemanni和poikilolaimus cf. regenfussi，被调查了。具体而言，我们问：（1）有机体之间是否存在竞争对手的竞争对手的初始密度和（3）其可变增长率（由不同食品诱导诱导的互动）之间存在间隙相互作用）。每种治疗最初含有48个线虫个体，但在不同的物种比率（48：0; 32:16; 24:24; 16:48）。将群体提供三种不同的细菌密度（10（8），10（9）和10（10）个细胞m1（-1））作为食物。使用广义的线性混合模型分析数据。最佳拟合模型显示出种群增长率的显着下降，物种比例增加，但取决于食物密度和物种。这些结果提供了强大的证据，用于对各种密度和食品供应水平不同的积极间隙相互作用。他们还表明了栖息地殖民化的积极间隙相互作用以及维持同一营养群体中物种共存的重要作用。

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