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Within-corridor heterogeneity is more important than corridor design for maintaining butterfly functional and taxonomic diversity
Journal of Applied Ecology ( IF 5.0 ) Pub Date : 2021-08-24 , DOI: 10.1111/1365-2664.14006 J. Schalkwyk 1 , R. Gaigher 1 , J. S. Pryke 1 , M. J Samways 1
中文翻译：
走廊内的异质性比走廊设计对保持蝴蝶功能和分类多样性更重要
更新日期：2021-08-24
Journal of Applied Ecology ( IF 5.0 ) Pub Date : 2021-08-24 , DOI: 10.1111/1365-2664.14006 J. Schalkwyk 1 , R. Gaigher 1 , J. S. Pryke 1 , M. J Samways 1
Affiliation
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- Local and landscape features influence the spatial distribution of biodiversity. At the landscape scale, heterogeneity has compositional and configurational components that can be measured at different resolutions of conservation planning.
- We assess the importance of local and landscape features measured at different planning resolutions for maintaining taxonomic and functional butterfly diversity. In remnant conservation corridors that dissect alien tree plantations, butterflies were sampled along a gradient of successional stages, from open and recently burned grasslands to closed-canopy woody habitats. Changes in local vegetation structure were represented by measures of canopy cover. At the landscape scale, compositional and configurational heterogeneity were measured at two resolutions: a simple binary classification of suitable habitat versus unsuitable transformed habitat, and a classification that accounts for the different successional stages within corridors (i.e. within-corridor heterogeneity). Butterfly assemblages were characterized using taxonomic (Simpson's diversity index) and functional indices (Rao's quadratic entropy). The relationship between environmental filters and species traits was further assessed using multivariate modelling.
- Taxonomic diversity did not reflect functional diversity, as the latter showed differential trait specific responses to local vegetation structure.
- For both functional and taxonomic diversity, local and landscape variables representing within-corridor heterogeneity were more important than landscape variables measured at the coarser planning resolution. Butterfly diversity showed a negative relationship with increasing edge density between grassy and woody habitats.
- Synthesis and applications. To promote the taxonomic and functional dimensions of biodiversity, management should aim to maintain both open- and closed-canopy habitats within corridors. These habitats should be contiguous, and corridors as wide as possible, to increase the patch size of contiguous habitat while reducing the proportion of edge.
中文翻译：
走廊内的异质性比走廊设计对保持蝴蝶功能和分类多样性更重要
- 地方和景观特征影响生物多样性的空间分布。在景观尺度上，异质性具有可以在保护规划的不同分辨率下测量的成分和配置成分。
- 我们评估了在不同规划分辨率下测量的局部和景观特征对于保持分类和功能蝴蝶多样性的重要性。在解剖外来树木种植园的残余保护走廊中，蝴蝶沿着一系列演替阶段的梯度进行采样，从开放的和最近被烧毁的草原到封闭的树冠木本栖息地。局部植被结构的变化通过冠层覆盖的测量来表示。在景观尺度上，成分和构型的异质性以两种分辨率进行测量：适宜栖息地与不适宜转化栖息地的简单二元分类，以及考虑廊道内不同演替阶段的分类（即廊道内异质性）。蝴蝶组合使用分类学（Simpson' s 多样性指数）和功能指数（Rao 的二次熵）。使用多变量建模进一步评估了环境过滤器和物种特征之间的关系。
- 分类多样性并不反映功能多样性，因为后者对当地植被结构表现出不同的性状特异性反应。
- 对于功能和分类多样性，代表走廊内异质性的局部和景观变量比在较粗略的规划分辨率下测量的景观变量更重要。蝴蝶多样性与草地和木质栖息地之间的边缘密度增加呈负相关。
- 合成与应用。为促进生物多样性的分类和功能维度，管理应旨在维持走廊内开放和封闭的树冠栖息地。这些栖息地应该是连续的，走廊尽可能宽，以增加连续栖息地的斑块大小，同时减少边缘的比例。
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