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A Field evaluation of techniques used to estimate density of blue jays

机译:用于估算蓝鸟密度的技术的现场评估

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摘要

We evaluate the ability of three techniques to estimate density of Blue Jays (Cy- anocitta cristata) on a series of 3.1-ha plots in eight habitat types in south-central Florida. Estimates generated from fixed-radius point counts (r = 30 m and 100 m) and the variable Circular-plot technique were compared to actual density of adult jays as measured from num- Ber of active nests in each plot during the study period. Based on analyses at the level of the Plot (n = 29), estimates from all three techniques were positively correlated with actual Density (r_s ≥ 0.53, P ≤ 0.003).
机译:我们评估了三种技术在佛罗里达州中南部八个生境类型上的一系列3.1公顷样地上估算蓝鸟(Cy-anocitta cristata)密度的能力。在研究期间,将根据固定半径点数(r = 30 m和100 m)和可变圆图技术产生的估计值与成年ay鸟的实际密度进行比较,该成年j鸟的实际密度是根据每个图中活动巢的数量进行测量的。基于该图水平(n = 29)的分析,所有三种技术的估计值与实际密度呈正相关(r_s≥0.53,P≤0.003)。

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