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Consumer roles of small mammals within fragmented native tallgrass prairie
Ecosphere ( IF 2.7 ) Pub Date : 2021-03-24 , DOI: 10.1002/ecs2.3441
Andrew G. Hope 1 , Sabrina F. Gragg 1 , Jesse B. Nippert 1 , Fraser J. Combe 1
Affiliation  

Grassland ecosystems globally are being negatively impacted by changes in climate, disturbance regimes, nutrient flux, and consumer guilds. Changes in the trophic ecology of consumers can substantially influence local resources, contributing to shifting diversity, community turnover, and other processes of ecosystem change. Small mammals are diverse and abundant within grasslands and yet the impact of changing ecosystems on small mammals and the role of these mammals as consumers are still both under‐studied. We assessed small mammal resource use within grassland and woodland vegetation types that have resulted from landscape‐scale experimental disturbance through fire treatments within the tallgrass prairie ecoregion of the North American Great Plains. We predicted that resource use would vary significantly among grassland vs. woodland communities, in turn reducing the role of small mammals in contributing to future maintenance of native prairies. We sampled five dominant species of rodents across three years and multiple habitats. Using stable isotope analysis, we investigated isotopic niche area and overlap to infer variation in diet, both within and among species. Resource use shifted in bivariate isotopic space seasonally but not across years when combining all species and habitats. Inferred spring diet (based on fur samples) was highly diverse and overlapping. Summer isotopic values (based on liver tissue) in woody habitat treatments were narrower and overlapped less than within grassland habitats. Consumers generally shifted from C4 herbivory to C3 herbivory, or greater omnivory, when analyzing grassland, shrubland, and woodland habitats respectively. Within the tallgrass prairie ecosystem, small mammal populations in herbaceous‐dominated habitats use a broader variety of resources than small mammals in proximate woody‐dominated habitats. As native grasslands experience woody encroachment, small mammal assemblages experience turnover of dominant species and associated changes in diet. Ecosystem changes such as cessation of frequent fire resulting in more woody habitats may include reduced roles by native small mammals as consumers/dispersers/propagators of native grassland plants.

中文翻译:

零散的原生高草草原中小型哺乳动物的消费者角色

全球草原生态系统正受到气候变化,干扰机制,养分通量和消费者行会的负面影响。消费者营养生态的变化会极大地影响当地资源,从而导致多样性的变化,社区营业额的变化以及生态系统变化的其他过程。草原上的小型哺乳动物种类繁多,种类繁多,但是生态系统变化对小型哺乳动物的影响以及这些哺乳动物作为消费者的作用仍然未被充分研究。我们评估了草原和林地植被类型中小型哺乳动物资源的使用,这些资源是由北美大平原高草草原生态区中的火灾处理引起的景观规模实验扰动引起的。我们预测,草原和草原之间的资源利用将有很大差异。林地社区,反过来减少了小型哺乳动物在为将来维护当地大草原所做的贡献中的作用。我们在三年和多个栖息地中对五种啮齿动物的优势物种进行了采样。使用稳定的同位素分析,我们研究了同位素的生态位面积和重叠,以推断物种内部和物种之间的饮食变化。当结合所有物种和栖息地时,资源使用量在双变量同位素空间中呈季节性变化,但没有跨年变化。推断的春季饮食(基于皮草样本)非常多样且重叠。与草地生境相比,木质生境处理中的夏季同位素值(基于肝组织)更窄且重叠更少。消费者普遍从C转向 我们在三年和多个栖息地中对五种啮齿动物的优势物种进行了采样。使用稳定的同位素分析,我们研究了同位素的生态位面积和重叠,以推断物种内部和物种之间的饮食变化。当结合所有物种和栖息地时,资源使用量在双变量同位素空间中呈季节性变化,但没有跨年变化。推断的春季饮食(基于皮草样本)非常多样且重叠。与草地生境相比,木质生境处理中的夏季同位素值(基于肝组织)更窄且重叠更少。消费者普遍从C转向 我们在三年和多个栖息地中对五种啮齿动物的优势物种进行了采样。使用稳定的同位素分析,我们研究了同位素的生态位面积和重叠,以推断物种内部和物种之间的饮食变化。当结合所有物种和栖息地时,资源使用量在双变量同位素空间中呈季节性变化,但没有跨年变化。推断的春季饮食(基于皮草样本)非常多样且重叠。与草地生境相比,木质生境处理中的夏季同位素值(基于肝组织)更窄且重叠更少。消费者普遍从C转向 当结合所有物种和栖息地时,资源使用量在双变量同位素空间中呈季节性变化,但没有跨年变化。推断的春季饮食(基于皮草样本)非常多样且重叠。与草地生境相比,木质生境处理中的夏季同位素值(基于肝组织)更窄且重叠更少。消费者普遍从C转向 当结合所有物种和栖息地时,资源使用量在双变量同位素空间中呈季节性变化,但没有跨年变化。推断的春季饮食(基于皮草样本)非常多样且重叠。与草地生境相比,木质生境处理中的夏季同位素值(基于肝组织)更窄且重叠更少。消费者普遍从C转向当分别分析草地,灌木丛和林地生境时,4草食性到C 3草食性,或更大的杂食性。在高草草原生态系统中,与草木为主的栖息地相比,草食为主的栖息地中的小型哺乳动物种群使用的资源种类更广泛。当原生草原遭受木本入侵时,小型哺乳动物会经历主要物种的周转和饮食的相关变化。生态系统的变化,例如停止频繁生火,导致生境更加茂密,可能包括本地小型哺乳动物作为本地草原植物的消费者/分散者/繁殖者的作用减少。
更新日期:2021-03-25
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