斑块面积不能预测科罗拉多州前山脉草原鸟类的物种丰富度

Q4 Agricultural and Biological Sciences Western Birds Pub Date : 2023-08-15 DOI:10.21199/wb54.3.3
Brian G. Tavernia
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引用次数: 0

摘要

在过去的50年里,草原上的鸟类繁殖急剧减少,科罗拉多州正在城市化的前山脉的绿地系统并没有维持该地区最初支持的所有草原鸟类物种。斑块面积影响着城市绿地的物种丰富度,保护或扩大绿地面积是实现城市绿地物种丰富度最大化和物种减少的有效途径。在Front Range,城市绿地的保护成本高昂,保护预算有限,需要工具来指导战略保护决策。前山岭规划者将斑块面积作为优先保护草地的标准,但斑块面积的解释和预测能力尚未得到全面评估。利用eBird社区科学数据,我发现对数变换后的草地斑块面积与草原鸟类物种丰富度呈正相关,并解释了其很大一部分方差。然而,95%的物种丰富度同时预测区间较宽,最小斑块和最大斑块的预测区间重叠。因此,该模型不能精确预测物种数量,也不能定量评价财政拨款保护或扩大草地斑块的预期投资回报。尽管如此,该模型的解释力支持将草地斑块面积作为指导草原鸟类保护的一般原则。规划者应该在一系列其他栖息地特征中考虑它,优先考虑靠近其他草原斑块、附近森林覆盖和城市发展有限的大型、有规则形状的草地斑块。
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Patch Area Cannot Predict Species Richness of Grassland Birds in Colorado’s Front Range
Birds breeding in grassland have declined steeply over the last 50 years, and green-space systems in Colorado’s urbanizing Front Range have not maintained all grassland bird species the area originally supported. Patch area affects the species richness of urban green spaces, and researchers have suggested that protecting or enlarging green spaces should be effective ways to maximize richness and mitigate species loss. In the Front Range, protection of urban green space is expensive, conservation budgets are limited, and tools are needed to guide strategic protection decisions. Front Range planners use patch area as a criterion to prioritize grassland conservation, but the explanatory and predictive powers of patch area have not been comprehensively assessed. Using eBird community science data, I found that log-transformed grassland patch area was positively associated with the species richness of grassland birds and explained a large portion of its variance. However, 95% simultaneous prediction intervals for species richness were wide, and those of the smallest and largest patches examined overlapped. Thus the model cannot precisely predict a number of species, and it should not be used to quantitatively evaluate the expected return on investment from financial allocations to protect or enlarge grassland patches. Nonetheless, the model’s explanatory power supports the use of grassland patch area as a general principle guiding conservation of grassland birds. Planners should consider it among a suite of other habitat characteristics and prioritize large, regularly shaped grassland patches situated close to other grassland patches and with limited nearby forest cover and urban development.
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Western Birds
Western Birds Agricultural and Biological Sciences-Animal Science and Zoology
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