Estimating the Live Body Weight of American Black Bears in Florida
Estimating the Live Body Weight of American Black Bears in Florida
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DOI：
10.3996/012016-jfwm-003
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发表时间：
2017-06-01
影响因子：
0.7
通讯作者：
Bartareau, Tad M.
中科院分区：
文献类型：
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作者：
Bartareau, Tad M.
当个体称重所需的设备不足或不可用时，测量大型动物的活体重量可能不切实际。我在这里的目的是开发一个模型，以准确地估计活体重的黑熊Ursus americanus佛罗里达州佛罗里达的基础上，规模的重量和性别，形态测量，年龄预测变量之间的关系在该领域。我使用信息论方法来评估70%数据的简单和多元线性回归模型，并使用剩余的30%来评估集合中的最佳模型。性别特异性模型是持续的，因为截距和年龄变量的系数在女性和男性建模的关系显着不同。胸围2是每种性别体重的最佳单一预测因子。一个模型，包括年龄，年龄2，和体长变量更好地支持比胸围2单独。我还创建了一个简化的模型来估计体重时，人员可能没有机会确定熊的年龄。尽管简化模型的支持率下降，但应用于验证数据集的所有模型的观察体重和估计体重之间的差异不显著。最佳模型偏倚的95%置信区间范围为雌性动物-1.9至1.6 kg，雄性动物-1.4至2.1 kg。简化模型的95%置信区间范围为雌性动物-1.8至2.3 kg，雄性动物-2.5至0.5 kg。体重估计模型可用于提供更多来自佛罗里达未用秤称重的经处理黑熊的活体重数据。
Measuring the live body weight of large-bodied animals can be impractical when equipment needed to weigh individuals is inadequate or unavailable. My objective here was to develop a model to accurately estimate the live body weight of black bears Ursus americanus floridanus in Florida based on the relationship between scale weight and sex, morphometric measurements, and age predictor variables obtainable in the field. I used an information-theoretic approach to evaluate simple and multiple linear regression models with 70% of the data, and evaluated the best model in the set using the remaining 30%. A sex-specific model was sustained because the intercept and coefficient of age variable in female and male modeled relationships differed significantly. Chest girth 2 was the best single predictor of body weight in each sex. A model including age, age 2, and body length variables was better supported than chest girth 2 alone. I also created a reduced model to estimate body weight when personnel may not have an opportunity to determine a bear's age. Even though there was decreasing support for the reduced model, differences between the observed and estimated body weight of all models applied to the validation data set were not significant. The 95% confidence interval on the bias of the best model ranged from -1.9 to 1.6 kg in females and -1.4 to 2.1 kg in males. The 95% confidence interval of the reduced model ranged from -1.8 to 2.3 kg in females and -2.5 to 0.5 kg in males. The body weight estimation models can be used to provide more live body weight data from handled black bears in Florida that are not weighed with a scale.