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Delayed release improves site fidelity but has little effect on survival or breeding success of reintroduced western quolls (Dasyurus geoffroii)
Austral Ecology ( IF 1.6 ) Pub Date : 2021-06-16 , DOI: 10.1111/aec.13073 Melissa A. Jensen 1 , David C. Paton 1 , Katherine E. Moseby 2
Austral Ecology ( IF 1.6 ) Pub Date : 2021-06-16 , DOI: 10.1111/aec.13073 Melissa A. Jensen 1 , David C. Paton 1 , Katherine E. Moseby 2
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Reintroductions of threatened species can fail due to a lack of site fidelity and dispersal of individuals away from the release site. Delayed-release techniques are commonly used in reintroduction programmes to acclimatise animals to novel sites to improve site fidelity and survival following release. However, some studies have found negative or little effect of initial containment on post-release outcomes, suggesting that the benefits of a delayed release may be species-specific or dependent on the methods used. The western quoll (Dasyurus geoffroii) is a 900–1300 g carnivorous marsupial that has previously been found to travel long distances after release, potentially contributing to reintroduction failure. We investigated the effect of immediate versus delayed release on the survival, site fidelity and breeding success of western quolls reintroduced to the Ikara-Flinders Ranges National Park in South Australia. Delayed-release animals were confined to individual 10 × 10 m outdoor release pens and provided with supplementary food and water for ten days prior to release. Immediate-release animals were released without any additional assistance provided. Monitoring of 39 radio-collared quolls for three months after release failed to detect a difference in survival probability between release treatments. There was also no evidence to suggest that the success or timing of breeding differed between immediate- and delayed-released quolls. However, a delayed release did significantly improve site fidelity. On average, delayed-release quolls remained within a linear distance of 1.6 km (SE = 0.348, 95% CI = 0.98–2.39) of their release site over three months, compared to 3.26 km (SE = 0.36, 95% CI = 2.57–4.03) for immediate-released animals. In unbounded release sites, delayed releases may assist with keeping western quolls within predator-controlled release areas. Results from this study may be used to guide future reintroductions of this threatened species.
中文翻译：
延迟释放提高了现场保真度，但对重新引入的西部袋鼬 (Dasyurus geoffroii) 的生存或繁殖成功几乎没有影响
由于缺乏现场保真度和个体远离释放现场，重新引入受威胁物种可能会失败。延迟释放技术通常用于重新引入计划，以使动物适应新地点，以提高地点保真度和释放后的存活率。然而，一些研究发现初始遏制对释放后的结果产生负面影响或影响很小，这表明延迟释放的好处可能是物种特异性的或取决于所使用的方法。西部袋鼬 ( Dasyurus geoffroii)) 是一种 900-1300 克的食肉有袋动物，以前曾发现它在释放后会长途跋涉，可能会导致重新引入失败。我们调查了立即释放与延迟释放对重新引入南澳大利亚伊卡拉-弗林德斯山脉国家公园的西部袋鼬的生存、现场保真度和繁殖成功的影响。延迟释放的动物被限制在单独的 10 × 10 m 室外释放围栏中，并在释放前 10 天提供补充食物和水。立即释放的动物在没有提供任何额外帮助的情况下被释放。对 39 只戴无线电项圈的袋鼬放生后三个月的监测未能检测到放生治疗之间存活概率的差异。也没有证据表明立即释放和延迟释放的袋鼬之间的繁殖成功或时机不同。但是，延迟发布确实显着提高了网站保真度。平均而言，延迟释放的袋鼬在三个月内与它们的释放地点保持在 1.6 公里（SE = 0.348，95% CI = 0.98-2.39）的线性距离内，而 3.26 公里（SE = 0.36，95% CI = 2.57） –4.03) 用于立即释放的动物。在无限制的释放地点，延迟释放可能有助于将西部袋鼬保持在捕食者控制的释放区域内。这项研究的结果可用于指导未来重新引入这种受威胁物种。348, 95% CI = 0.98–2.39) 超过三个月的释放地点，而立即释放的动物为 3.26 km (SE = 0.36, 95% CI = 2.57–4.03)。在无限制的释放地点，延迟释放可能有助于将西部袋鼬保持在捕食者控制的释放区域内。这项研究的结果可用于指导未来重新引入这种受威胁物种。348, 95% CI = 0.98–2.39) 超过三个月的释放地点，而立即释放的动物为 3.26 km (SE = 0.36, 95% CI = 2.57–4.03)。在无限制的释放地点，延迟释放可能有助于将西部袋鼬保持在捕食者控制的释放区域内。这项研究的结果可用于指导未来重新引入这种受威胁物种。
更新日期：2021-06-16
中文翻译：
延迟释放提高了现场保真度，但对重新引入的西部袋鼬 (Dasyurus geoffroii) 的生存或繁殖成功几乎没有影响
由于缺乏现场保真度和个体远离释放现场，重新引入受威胁物种可能会失败。延迟释放技术通常用于重新引入计划，以使动物适应新地点，以提高地点保真度和释放后的存活率。然而，一些研究发现初始遏制对释放后的结果产生负面影响或影响很小，这表明延迟释放的好处可能是物种特异性的或取决于所使用的方法。西部袋鼬 ( Dasyurus geoffroii)) 是一种 900-1300 克的食肉有袋动物，以前曾发现它在释放后会长途跋涉，可能会导致重新引入失败。我们调查了立即释放与延迟释放对重新引入南澳大利亚伊卡拉-弗林德斯山脉国家公园的西部袋鼬的生存、现场保真度和繁殖成功的影响。延迟释放的动物被限制在单独的 10 × 10 m 室外释放围栏中，并在释放前 10 天提供补充食物和水。立即释放的动物在没有提供任何额外帮助的情况下被释放。对 39 只戴无线电项圈的袋鼬放生后三个月的监测未能检测到放生治疗之间存活概率的差异。也没有证据表明立即释放和延迟释放的袋鼬之间的繁殖成功或时机不同。但是，延迟发布确实显着提高了网站保真度。平均而言，延迟释放的袋鼬在三个月内与它们的释放地点保持在 1.6 公里（SE = 0.348，95% CI = 0.98-2.39）的线性距离内，而 3.26 公里（SE = 0.36，95% CI = 2.57） –4.03) 用于立即释放的动物。在无限制的释放地点，延迟释放可能有助于将西部袋鼬保持在捕食者控制的释放区域内。这项研究的结果可用于指导未来重新引入这种受威胁物种。348, 95% CI = 0.98–2.39) 超过三个月的释放地点，而立即释放的动物为 3.26 km (SE = 0.36, 95% CI = 2.57–4.03)。在无限制的释放地点，延迟释放可能有助于将西部袋鼬保持在捕食者控制的释放区域内。这项研究的结果可用于指导未来重新引入这种受威胁物种。348, 95% CI = 0.98–2.39) 超过三个月的释放地点，而立即释放的动物为 3.26 km (SE = 0.36, 95% CI = 2.57–4.03)。在无限制的释放地点，延迟释放可能有助于将西部袋鼬保持在捕食者控制的释放区域内。这项研究的结果可用于指导未来重新引入这种受威胁物种。
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