Connectivity of agroecosystems: dispersal costs can vary among crops

被引:63
作者
Cosentino, Bradley J. [1 ]
Schooley, Robert L. [2 ]
Phillips, Christopher A. [3 ]
机构
[1] Univ Illinois, Program Ecol Evolut & Conservat Biol, Urbana, IL 61801 USA
[2] Univ Illinois, Dept Nat Resources & Environm Sci, Urbana, IL 61801 USA
[3] Univ Illinois, Illinois Nat Hist Survey, Champaign, IL 61820 USA
关键词
Agriculture; Amphibian; Connectivity; Cost-distance; Dispersal; Illinois; Landscape matrix; Least-cost; Salamander; Spatial ecology; QUANTIFYING FUNCTIONAL CONNECTIVITY; POND-BREEDING AMPHIBIANS; TOAD BUFO-CALAMITA; LANDSCAPE CONNECTIVITY; FRAGMENTED LANDSCAPES; PATCH CONNECTIVITY; FOREST; HABITAT; RESISTANCE; MIGRATION;
D O I
10.1007/s10980-010-9563-1
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Knowledge of how habitat heterogeneity affects dispersal is critical for conserving connectivity in current and changing landscapes. However, we generally lack an understanding of how dispersal costs and animal movements vary among crops characteristic of agroecosystems. We hypothesized that a physiological constraint, desiccation risk, influences movement behavior among crops and other matrix habitats (corn, soybean, forest, prairie) in Ambystoma tigrinum (tiger salamander) in Illinois, USA. In a desiccation experiment, salamanders were added to enclosures in four replicate plots of each matrix habitat, and water loss was measured every 12 h for 48 h. Changes in water loss were examined using a linear mixed model. Water loss varied among treatments, over time, and there was a significant treatment-time interaction. Water loss was greater in corn and prairie than in forest and soybean. To assess whether salamanders move through matrix habitats that minimize desiccation, we tracked movements of individuals released on edges between habitats for two treatment combinations: soybean-corn, and soybean-prairie. As predicted based on our desiccation experiment, movements were oriented towards soybean in both cases. Thus, variation in desiccation risk among matrix habitats likely influenced movement decisions by salamanders, although other factors such as predation risk could have contributed to habitat choice. We argue that conceptualizing dispersal cost as uniformly high in all crop types is too simplistic. Estimating crop-specific dispersal costs and movement patterns may be necessary for constructing effective measures of landscape connectivity in agroecosystems.
引用
收藏
页码:371 / 379
页数:9
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