小型哺乳动物摄影巢箱的研制及其在冲绳棘鼠繁殖计划估算中的应用

IF 0.8 4区 生物学 Q3 ZOOLOGY Mammal Study Pub Date : 2021-12-27 DOI:10.3106/ms2021-0025
Nobuhiko Kotaka, M. Yasuda, Takuya Shimada
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引用次数: 0

摘要

摘要为了根据冲绳棘鼠的体型分布来估计其繁殖时间表,我们开发了一个带有自动触发相机的巢箱。从2015年9月开始,在冲绳岛北部的野外使用了三个安装了摄像头的巢箱。在850张多刺大鼠的图像中测量了眼睛之间的距离,这是一个衡量体型的指标。繁殖时间表是根据亚成体的出现期来估计的。随着亚成年人的出现,体型指数的分布变成了由成年人和亚成年人组成的两个正态分布的混合,因此采用高斯混合模型来识别每个分布。高斯混合模型显示,估计的眼睛之间距离的分布可以分为两个聚类,第一组(亚成年)的混合比为0.11,第二组(成年)为0.89。属于第1组的大多数个体出现在12月至3月的冬季,这表明亚成体主要在这个季节断奶。因此,冲绳棘鼠的繁殖被认为在秋冬季节受到限制。
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Development of a Camera-Installed Nest Box for Small Mammals and Its Application in Reproductive Schedule Estimation for the Okinawa Spiny Rat
Abstract. To estimate the reproductive schedule of the Okinawa spiny rat on the basis of its body size distribution, we developed a nest box with an auto-trigger camera. Three camera-installed nest boxes were used in the field in the northern part of Okinawa Island beginning in September 2015. The distance between eyes, an index of body size, was measured in 850 images of spiny rats. The reproductive schedule was estimated based on the emergence period of subadults. With the emergence of subadults, the distribution of body size index becomes a mixture of two normal distributions consisting of adults and subadults, so a Gaussian mixture model was employed to identify each distribution. The Gaussian mixture model revealed that the distribution of the estimated distance between eyes could be divided into two clusters, with a mixing ratio of 0.11 for Group 1 (subadult) and 0.89 for Group 2 (adult). Most individuals belonging to Group 1 appeared during the winter months of December to March, indicating that subadults were weaned primarily during this season. Consequently, reproduction of the Okinawa spiny rat is thought to be limited in autumn and winter.
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来源期刊
Mammal Study
Mammal Study ZOOLOGY-
CiteScore
1.70
自引率
20.00%
发文量
23
审稿时长
>12 weeks
期刊介绍: Mammal Study is the official journal of the Mammal Society of Japan. It publishes original articles, short communications, and reviews on all aspects of mammalogy quarterly, written in English.
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