Landscape configuration and habitat complexity shape arthropod assemblage in urban parks

Ming-Hsiao Peng,Kok-Boon Neoh,Kuan-Ling Liu,Yuan-Chen Hung

doi:10.1038/s41598-020-73121-0

Abstract

The urbanization process systematically leads to the loss of biodiversity. Only certain arthropods are resilient to the urbanization process and can thrive in the novel conditions of urbanized landscapes. However, the degree to which arthropod communities survive in urban habitats depends on landscape and local effects and biological interactions (e.g., trophic interactions). In the present study, we examined the relative importance of various factors at landscape (isolation, edge density and area of surrounding greenery) and local (size of park, canopy cover, understory vegetation cover, defoliation depth, weight of dried leaves, soil temperature, soil moisture, and soil pH) spatial scales on the diversity of ants, beetles and spiders in urban parks. Our results indicated that park edge density was negatively correlated with diversity metrics in ants, beetles, and spiders in urban parks relative to the degree of proximity with the peri-urban forest. In other words, parks that located adjacent to the peri-urban forest may not necessarily have high biodiversity. The results suggested that man-made structures have been effective dispersal barriers that limit the spillover effects of ants and spiders but not the spillover of comparatively strong fliers, such as beetles. However, the area of surrounding greenery may have facilitated the colonization of forest-dependent taxa in distant parks. Large parks with reduced edge density supported a higher arthropod diversity because of the minimal edge effect and increased habitat heterogeneity. Vegetation structure consistently explained the variability of ants, beetles, and spiders, indicating that understory plant litter is crucial for providing shelters and hibernation, oviposition, and foraging sites for the major taxa in urban parks. Therefore, efforts should focus on the local management of ground features to maximize the conservation of biological control in urban landscapes.

Highlights

The urbanization process systematically leads to the loss of biodiversity
We examined the effects of landscape and local scale on the diversity of three major taxa in urban parks in Taichung city, Central Taiwan
These findings demonstrated that an increase in habitat heterogeneity engendered an increase in species diversity in large urban parks, which primarily supported the diverse community of urban-adapted species that responded favorably to the landscape change

Summary

Introduction

The urbanization process systematically leads to the loss of biodiversity. Only certain arthropods are resilient to the urbanization process and can thrive in the novel conditions of urbanized landscapes. We examined the relative importance of various factors at landscape (isolation, edge density and area of surrounding greenery) and local (size of park, canopy cover, understory vegetation cover, defoliation depth, weight of dried leaves, soil temperature, soil moisture, and soil pH) spatial scales on the diversity of ants, beetles and spiders in urban parks. Landscape‐scale low-contrast habitat patch that characteristic of increased species richness and abundance inside habitat patches may reduce the impact of the isolation between urban parks and peri-urban forests[14,15]. These habitat patches may intensify inter-patch movement as well as provide additional or alternative foraging and nesting resources[16]. Most predators and parasitoids that survive in urbanized landscapes are habitat generalist species and are tolerant to the urbanization process[19,22]

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Conclusion