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The Complementary Relationship of Bison Grazing and Arthropod Herbivory in Structuring a Tallgrass Prairie Community
Rangeland Ecology & Management ( IF 2.3 ) Pub Date : 2020-04-11 , DOI: 10.1016/j.rama.2020.02.008
Sofia Varriano , Luke H. Lefler , Krishna Patel , Carolina Kirksey , Adam Turner , Matthew D. Moran

Large mammal grazing is considered an important biological process that structures many grassland plant communities. While herbivorous arthropods are also important consumers in terrestrial systems, their interaction with large mammal grazing is poorly studied. We performed a field experiment in a tallgrass prairie manipulating arthropod abundance in both bison-grazed and ungrazed areas following a prescribed burn and monitored the plant community for 15 mo. Total plant biomass was unchanged by the end of the experiment, but individual biomass of forbs and grasses was altered by our manipulations. Forb biomass in the bison-grazed/arthropod-reduced plots was two to three times higher than other treatments, while grass biomass was higher in bison-grazed plots where arthropods were unmanipulated. Grass and forb richness showed smaller responses, with a significant difference only in ungrazed areas. Our results suggest that bison grazing and arthropod herbivory work in a complementary way; bison reduce grass biomass, allowing forbs to increase, while herbivorous arthropods reduce forb biomass, allowing grasses to increase. Our study showed that removing herbivorous arthropods may have lengthened the transition from forb to grass dominance, therefore delaying the return of conditions conducive to future disturbance by fire. Therefore, we argue that arthropod herbivory, interacting with large mammal grazing, is an additional important process affecting the plant community composition and disturbance patterns in tallgrass prairies and should be investigated further in additional grassland systems.



中文翻译:

野牛放牧与节肢动物食草动物在构建高草草原草原社区中的互补关系

大型哺乳动物放牧被认为是构成许多草原植物群落的重要生物过程。尽管食草节肢动物也是陆地系统中的重要消费者,但对它们与大型哺乳动物放牧的相互作用的研究却很少。在规定的烧伤后,我们在高野草草原上进行了野外实验,以控制节肢动物丰富度和野牛化和非自然化地区的节肢动物生长,并监测了植物群落15个月。到实验结束时,植物总生物量没有变化,但是我们的操作改变了前茅和草的单个生物量。在野牛节肢/节肢动物减少的地块中,Forb的生物量是其他处理方法的2到3倍,而在没有节肢动物节肢动物的野牛地块中,草的生物量更高。草和草的丰富度显示出较小的响应,仅在未擦拭区域有显着差异。我们的结果表明,野牛放牧和节肢动物食草的工作是相辅相成的。野牛减少草的生物量,从而增加草的数量,而草食节肢动物减少草的生物量,从而增加草的数量。我们的研究表明,除去草食性节肢动物可能会延长从Forb到草占优势的过渡,因此延迟了有利于未来火势干扰的条件的恢复。因此,我们认为节肢动物食草与大型哺乳动物放牧相互作用是影响高草草原植物群落组成和干扰方式的另一个重要过程,应在其他草地系统中进一步研究。我们的结果表明,野牛放牧和节肢动物食草的工作是相辅相成的。野牛减少草的生物量,从而增加草的数量,而草食节肢动物减少草的生物量,从而增加草的数量。我们的研究表明,除去草食性节肢动物可能会延长从Forb到草占优势的过渡,因此延迟了有利于未来火势干扰的条件的恢复。因此,我们认为节肢动物食草与大型哺乳动物放牧相互作用是影响高草草原植物群落组成和干扰方式的另一个重要过程,应在其他草地系统中进一步研究。我们的结果表明,野牛放牧和节肢动物食草的工作是相辅相成的。野牛减少草的生物量,从而增加草的数量,而草食节肢动物减少草的生物量,从而增加草的数量。我们的研究表明,除去草食性节肢动物可能会延长从Forb到草占优势的过渡,因此延迟了有利于未来火势干扰的条件的恢复。因此,我们认为节肢动物食草与大型哺乳动物放牧相互作用是影响高草草原植物群落组成和干扰方式的另一个重要过程,应在其他草地系统中进一步研究。允许草增加。我们的研究表明,除去草食性节肢动物可能会延长从Forb到草占优势的过渡,因此延迟了有利于未来火势干扰的条件的恢复。因此,我们认为节肢动物食草与大型哺乳动物放牧相互作用是影响高草草原植物群落组成和干扰方式的另一个重要过程,应在其他草地系统中进一步研究。允许草增加。我们的研究表明,除去草食性节肢动物可能会延长从Forb到草占优势的过渡,因此延迟了有利于将来受火干扰的条件的恢复。因此,我们认为节肢动物食草与大型哺乳动物放牧相互作用是影响高草草原植物群落组成和干扰方式的另一个重要过程,应在其他草地系统中进一步研究。

更新日期:2020-04-11
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