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<p>The study of how animals move across a landscape and use resources is often limited by the approaches to consistently detect and track individuals of all age classes. This is particularly challenging for amphibians, such as <i>Siren intermedia</i> (Lesser Siren), due to their highly cryptic nature, mobility, trap-shy behaviors, small juvenile size, and ability to aestivate underground during droughts. We examined the capture, size, redetection/movement, and aestivation patterns of juvenile and adult <i>S. intermedia</i> within a single pond over two years, using systematic dipnetting, funnel and trashcan trapping, and active Passive Integrated Transponder (PIT) scanning telemetry surveys. The overall raw capture rate (captures/effort) was low (0.04), likely due to the large pond size and dispersion of individuals. Detection varied by method, age, season, and pond conditions. Juveniles were primarily captured via dipnetting near shore, while adults were detected in deeper areas in funnel and trashcan traps. The percentage physically recaptured was low (5%), while PIT telemetry increased overall redetection (21%). Movements were shaped by hydrologic and environmental change, with reduced movement during dry conditions. PIT telemetry yielded the first field-based evidence of multiple aestivation bouts within a single year with aestivation occurring in 40% of redetected individuals which was strongly associated with reduced pond area. Estimated durations ranged from 14 to 201&#xa0;days. Our integrative approach highlights the value of combining multiple detection methods to uncover fine-scale behavioral patterns across space, time, and age that are essential for long-term monitoring and conservation in dynamic pond wetland systems.</p>

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Gone with the rain: capture, movement, and aestivation patterns of Siren intermedia

  • 期刊论文

  • 发表日期：

    2025年8月26日

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  • Jacob M. Hutton,
  • Robin W. Warne

摘要

The study of how animals move across a landscape and use resources is often limited by the approaches to consistently detect and track individuals of all age classes. This is particularly challenging for amphibians, such as Siren intermedia (Lesser Siren), due to their highly cryptic nature, mobility, trap-shy behaviors, small juvenile size, and ability to aestivate underground during droughts. We examined the capture, size, redetection/movement, and aestivation patterns of juvenile and adult S. intermedia within a single pond over two years, using systematic dipnetting, funnel and trashcan trapping, and active Passive Integrated Transponder (PIT) scanning telemetry surveys. The overall raw capture rate (captures/effort) was low (0.04), likely due to the large pond size and dispersion of individuals. Detection varied by method, age, season, and pond conditions. Juveniles were primarily captured via dipnetting near shore, while adults were detected in deeper areas in funnel and trashcan traps. The percentage physically recaptured was low (5%), while PIT telemetry increased overall redetection (21%). Movements were shaped by hydrologic and environmental change, with reduced movement during dry conditions. PIT telemetry yielded the first field-based evidence of multiple aestivation bouts within a single year with aestivation occurring in 40% of redetected individuals which was strongly associated with reduced pond area. Estimated durations ranged from 14 to 201 days. Our integrative approach highlights the value of combining multiple detection methods to uncover fine-scale behavioral patterns across space, time, and age that are essential for long-term monitoring and conservation in dynamic pond wetland systems.