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Diversity and resource selection of dung beetles in a relictual mountain forest in Brazil
International Journal of Tropical Insect Science ( IF 1.2 ) Pub Date : 2020-10-20 , DOI: 10.1007/s42690-020-00327-0 Fredy Alvarado , Carolina N. Liberal , Thais A. V. Dantas , Davy B. Bérgamo , Rosemberg F. Menezes
International Journal of Tropical Insect Science ( IF 1.2 ) Pub Date : 2020-10-20 , DOI: 10.1007/s42690-020-00327-0 Fredy Alvarado , Carolina N. Liberal , Thais A. V. Dantas , Davy B. Bérgamo , Rosemberg F. Menezes
Most of the tropical ecosystems are now altered, consequently modifying the species diversity, composition and feeding behaviours. Precisely, the survival of species is dependent on their characteristics to endure the novel environments immersed in human-dominated landscapes. Thus, comparative studies of how different community attributes and trophic guilds respond to changes in land use would be useful. In this study, we analyzed diversity, composition and food selection of dung beetles in an Atlantic forest enclave (Ombrophilous forest remnant) from North-eastern Brazil. We sampled dung beetles using 60 pitfall traps distributed in our study region. Diversity and composition were estimated by using Hill numbers (or the effective number of species) and biomass of individuals and were compared among three types of vegetation structure (forest, forest edge and open pastures) and four different types of baits (human, pig, chicken and cattle excrements). We found that diversity measures weighted by biomass allowed better detection of the variation between habitat types and food preference than weighted by the number of individuals. The dung beetle biomass indicates that the spatial dominance of open pastures promote a drastic impoverishment of dung beetle diversity and composition. We also found that β diversity shows an evidence of homogenization on the resource food selection, related with the preference in the attraction of dung beetles to exotic omnivores. Our results show that replacing forests with cattle pastures modifies diversity, species composition, and resource food selection patterns, which could affect the ecosystem provision by dung beetles. Despite our study region is immersed in a human-dominated-landscape, forest remnants continue to hold a high diversity assemblage compared with most degraded environments.
中文翻译:
巴西荒山林蜣螂的多样性与资源选择
大多数热带生态系统现在都发生了改变,从而改变了物种多样性、组成和摄食行为。确切地说,物种的生存取决于它们的特性,以忍受沉浸在人类主导的景观中的新环境。因此,对不同社区属性和营养行会如何响应土地利用变化的比较研究将是有用的。在这项研究中,我们分析了巴西东北部大西洋森林飞地(Ombrophilous Forest Remnant)中蜣螂的多样性、组成和食物选择。我们使用分布在我们研究区域的 60 个陷阱陷阱对蜣螂进行了采样。多样性和组成是通过使用希尔数(或有效物种数)和个体生物量来估计的,并在三种植被结构(森林、森林边缘和开阔牧场)和四种不同类型的诱饵(人、猪、鸡和牛的排泄物)。我们发现,与按个体数量加权相比,按生物量加权的多样性测量可以更好地检测栖息地类型和食物偏好之间的变化。粪甲虫生物量表明开放牧场的空间优势导致粪甲虫的多样性和组成急剧减少。我们还发现 β 多样性显示了资源食物选择同质化的证据,这与粪甲虫对异国杂食动物的吸引力有关。我们的研究结果表明,用牛牧场取代森林会改变多样性、物种组成和资源食物选择模式,这可能会影响粪甲虫对生态系统的供给。
更新日期:2020-10-20
中文翻译:
巴西荒山林蜣螂的多样性与资源选择
大多数热带生态系统现在都发生了改变,从而改变了物种多样性、组成和摄食行为。确切地说,物种的生存取决于它们的特性,以忍受沉浸在人类主导的景观中的新环境。因此,对不同社区属性和营养行会如何响应土地利用变化的比较研究将是有用的。在这项研究中,我们分析了巴西东北部大西洋森林飞地(Ombrophilous Forest Remnant)中蜣螂的多样性、组成和食物选择。我们使用分布在我们研究区域的 60 个陷阱陷阱对蜣螂进行了采样。多样性和组成是通过使用希尔数(或有效物种数)和个体生物量来估计的,并在三种植被结构(森林、森林边缘和开阔牧场)和四种不同类型的诱饵(人、猪、鸡和牛的排泄物)。我们发现,与按个体数量加权相比,按生物量加权的多样性测量可以更好地检测栖息地类型和食物偏好之间的变化。粪甲虫生物量表明开放牧场的空间优势导致粪甲虫的多样性和组成急剧减少。我们还发现 β 多样性显示了资源食物选择同质化的证据,这与粪甲虫对异国杂食动物的吸引力有关。我们的研究结果表明,用牛牧场取代森林会改变多样性、物种组成和资源食物选择模式,这可能会影响粪甲虫对生态系统的供给。