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首页> 外文期刊>Aquatic Biology >Proximity loggers on amphibious mammals: a new method to study social relations in their terrestrial habitat
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Proximity loggers on amphibious mammals: a new method to study social relations in their terrestrial habitat

机译：两栖哺乳动物的接近记录仪：研究其陆地栖息地社会关系的一种新方法

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ABSTRACT: Amphibious mammal species alternate between foraging at sea and attendance on land. Due to thermoregulatory requirements, they often haul out during the night, making social interactions difficult to observe. We tested the suitability of UHF-proximity loggers for assessing social relationships among Galápagos sea lions Zalophus wollebaeki. To survive periods at sea, proximity loggers were embedded in epoxy. Automatic downloads to receiving stations rendered logger recovery unnecessary. Encounters were logged within a range of 10 m. Logs provided information about interacting individuals as well as time and duration of encounters. ‘Received signal strength indicator’ values correlated with distance, but were influenced by antenna angle and environmental factors. Laboratory tests and validation in the field demonstrated that the spatial resolution corresponded to 2 m. Data needed to be corrected, as single encounters were recorded as multiple logs and reciprocity of loggings between animals was not always achieved. Digital data correlated with observational data, but associations were 4 times more likely to be detected using proximity loggers. Data revealed that non-territorial males frequently associated for extended periods of time, especially during the night and even outside the study colony. The modified proximity logger system proves an excellent tool to determine social structure in situations where direct observation is limited.
机译：摘要：两栖哺乳动物在海上觅食和陆上觅食之间交替。由于体温调节的要求，他们经常在夜间出门，使得社交互动难以观察。我们测试了UHF感应记录器对评估加拉帕戈斯海狮 Zalophus wollebaeki 之间的社会关系的适用性。为了在海上生存，将接近记录仪嵌入环氧树脂中。自动下载到接收站使记录器恢复变得不必要。在10 m的范围内遇到了记录。日志提供了有关与人互动以及相遇的时间和持续时间的信息。 “接收信号强度指示器”值与距离相关，但受到天线角度和环境因素的影响。实验室测试和现场验证表明，空间分辨率相当于2 m。数据需要校正，因为单次相遇被记录为多次记录，而动物之间的记录却并非总是相互对应。数字数据与观测数据相关，但是使用接近记录仪检测到关联的可能性要高4倍。数据显示，非领地男性经常伴有较长时间的交往，尤其是在夜间甚至在研究殖民地之外。改进的接近记录器系统证明是在直接观察受限的情况下确定社会结构的绝佳工具。

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