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Quantifying responses of dung beetle assemblages to cattle grazing removal over a short-term in introduced Brazilian pastures
Acta Oecologica ( IF 1.8 ) Pub Date : 2020-12-06 , DOI: 10.1016/j.actao.2020.103681
César M.A. Correa , Marco A. Lara , Anderson Puker , Jorge Ari Noriega , Vanesca Korasaki

Pasture management techniques may affect the biodiversity of insects beneficial to pastures, such as dung beetles. Cattle grazing removal over a short-term is widely used in introduced Brazilian pastures. However, the impact of this management on dung beetles is still unknown. This study evaluated the taxonomic (species richness, abundance, biomass, species composition, Shannon, and Simpson indexes) and functional (functional richness FRic, functional dispersion FDis, functional evenness FEve, and community-weighted means of trait values CWMs) dung beetle assemblages response to cattle grazing removal over a short-in introduced pastures. We sampled dung beetles, with pitfall traps baited with cattle dung and carrion, simultaneously in pastures with constant cattle grazing (control), and one, three, and five months after cattle grazing removal in Aquidauana, Mato Grosso do Sul, Brazil. Taxonomic metrics and FRic, FDis, and FEve did not differ among control and pasture treatments. We found that pastures with one month of cattle removal maintain the same CWM coprophagous diet from the control, and higher CWM biomass in relation to control. Although cattle grazing removal, at least over the short-term, does not cause a negative impact on dung beetle taxonomic metrics and functional diversity indexes, two important traits associated to dung removal are negatively affected after three months of cattle removal. Thus, we suggest that one month of cattle removal to grazing rotational management in introduced Brazilian pastures can be a useful strategy to, besides conserving the grass, also conserving dung beetle diversity, and consequently the ecological functions performed by them.



中文翻译:

在引入的巴西牧场中,定量评估甲虫组合对短期放牧牛的反应

牧场管理技术可能会影响有益于牧场的昆虫的生物多样性,例如虫。在引入的巴西牧场中,短期内广泛使用牛放牧。但是,这种管理对虫的影响仍然未知。这项研究评估了分类甲虫(物种丰富度,丰度,生物量,物种组成,香农和辛普森指数)和功能性(功能丰富度FRic,功能分散度FDis,功能均匀度FEve和特征值CWM的社区加权平均值)粪便甲虫组合对引进的短牧场放牧对牛的反应。我们对粪便甲虫进行了采样,并用牛粪和腐肉诱饵诱捕了陷阱,同时在不断放牧牲畜的草地上(对照),一头,三头,在巴西南马托格罗索州阿基多纳(Aquidauana)放牧牲畜后五个月。对照和牧场处理方法之间的分类指标和FRic,FDis和FEve没有差异。我们发现,放牧一个月的牧场与对照组相比,保持相同的CWM共食饮食,与对照组相比,CWM生物量更高。尽管至少在短期内,放牧对牛甲虫分类标准和功能多样性指数没有造成负面影响,但与牛粪清除相关的两个重要特征在牛清除三个月后受到负面影响。因此,我们建议,在引进的巴西牧场中,将一个月的牲畜转移到牧场进行轮牧管理可能是一种有用的策略,除了保护草皮之外,还可以保护甲虫的多样性,

更新日期:2020-12-06
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