DOI: 10.1016/j.foreco.2017.02.001
Scopus记录号: 2-s2.0-85013224066
论文题名: Multi-scale responses of fox squirrels to land-use changes in Florida: Utilization mimics historic pine savannas
作者: Greene D.U. ; McCleery R.A.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2017
卷: 391 起始页码: 42
结束页码: 51
语种: 英语
英文关键词: Camera surveys
; Camera traps
; Fox squirrel
; Habitat selection
; Longleaf pine
; Sciurus niger
Scopus关键词: Cameras
; Ecology
; Forestry
; Hardwoods
; Land use
; Surveys
; Fox squirrel
; Habitat selection
; Land-cover types
; Longleaf pine
; Management practices
; Niger
; Residential development
; Savanna ecosystems
; Ecosystems
; bioindicator
; coniferous forest
; coniferous tree
; conservation management
; environmental disturbance
; habitat selection
; home range
; human activity
; land use change
; patchiness
; population decline
; rodent
; savanna
; species occurrence
; trap (equipment)
; Florida [United States]
; United States
; Pinus palustris
; Sciurus niger
英文摘要: Pine savanna ecosystems in the southeastern United States are highly fragmented and degraded. Within these ecosystems, southeastern fox squirrels (Sciurus niger spp.) appear to be excellent bioindicators and serve important ecological roles. However, because of the loss of these areas, fox squirrel populations are patchily distributed and they are thought to be declining. To determine factors influencing their distribution, we conducted a multi-scale occupancy study throughout the range of the Sherman's fox squirrel (S. n. shermani) in Florida. We surveyed 40 landscapes comprised of 200 grids and 1800 camera-trap points. We recorded 3170 camera-trap photos of fox squirrels at 8 of the 21 land cover classes surveyed, at 26 landscapes (65.0%), 70 grids (35.0%), and 210 of the camera-trap points (11.7%). At the landscape scale (7.65 km2), the occurrence of fox squirrels increased as the amount of interspersion in tree cover increased, but decreased with increasing tree cover, supporting the need for open canopied areas interspersed with hardwoods and hardwood thickets at broad scales. At the finer grid scale (5.3 ha), their occurrence increased with pine and oak densities and proximity to urban and residential development and was also negatively influenced by tree cover. At the grid and point scales, fox squirrels were more likely to occur in areas with increased canopy closure, supporting their association with patches of oak trees imbedded in open canopy forests similar to the pine savannas that once dominated the region. Fox squirrels’ occurrence was negatively influenced by woody understory and woody ground cover at all scales. Their preference for a midstory with an open canopy and clear understory also suggest a reliance on frequent disturbance such as fire to maintain their habitat. Fox squirrels appear to be highly adaptable as they occurred in land cover types and altered landscapes (e.g., developed, agriculture) outside of natural pine savannas. But, as indicators of pine savanna ecosystem health, their conservation along with other wildlife tied to these forests will necessitate management practices that include or emulate a fire regime to reduce tree canopy densities and the encroachment of the understory layer and woody ground cover, but also to maintain heterogeneity that intersperses requisites (food, shelter, and cover) across the landscape. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/64403
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Wildlife Ecology and Conservation, University of Florida, Gainesville, FL, United States
Recommended Citation:
Greene D.U.,McCleery R.A.. Multi-scale responses of fox squirrels to land-use changes in Florida: Utilization mimics historic pine savannas[J]. Forest Ecology and Management,2017-01-01,391