Surveillance of Eimeria species in wild Japanese rock ptarmigans, Lagopus muta japonica, and insight into parasitic seasonal life cycle at timberline regions of the Japanese Alps.
Surveillance of Eimeria species in wild Japanese rock ptarmigans, Lagopus muta japonica, and insight into parasitic seasonal life cycle at timberline regions of the Japanese Alps.
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DOI：
10.1016/j.ijppaw.2018.03.004
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发表时间：
2018-08
期刊：
影响因子：
--
通讯作者：
Murata K
中科院分区：
文献类型：
--
作者：
Matsubayashi M;Tsuchida S;Ushida K;Murata K
日本岩雷鸟（Lagopus muta japonica）栖息于海拔3000m的山区高寒地带。自从 L. m.粳稻由于总体数量下降而濒临灭绝，控制原生动物寄生虫等传染病是保护该物种的关键因素。虽然艾美耳球虫属。被认为对日本岩雷鸟种群有负面影响，但寄生虫与其宿主之间的生态相互作用尚未完全阐明。因此，我们对艾美耳球虫属的流行情况进行了季节性调查。在日本岩雷鸟种群中。此外，我们还记录了雷鸟栖息地的环境温度，并表征了艾美耳分离株获得感染性的能力。艾美耳球虫属2006 年，在 520 个日本岩雷鸟粪便样本中的 217 个（41.7%）和 2007 年的 308 个粪便样本中，检测到了 177 个（57.5%）。具体来说，我们观察到了 E. uekii 和 B 型两种特征的卵囊。在成年鸟类和雏鸟中，感染率在 8 月（夏季）时增加，然后随着 11 月（冬季）气温降低而下降。成虫和雏鸡每克粪便中的卵囊数 (OPG) 在 8 月份达到峰值，且雏鸡的 OPG 值明显高于成虫。分离的艾美耳球虫属。卵囊在低至 8°C 的温度下形成孢子，并在 4°C 保存 6 个月后仍能存活。我们的研究结果表明艾美耳球虫属。可以在寄主日本岩雷鸟和艾美耳球虫栖息的寒冷林线地区完成其每年的生命周期。感染在所检查的鸟类种群中广泛存在。两种类型的卵囊，E. uekii 和 B 型，是高度感染的日本岩雷鸟。夏季感染率上升，冬季气温下降则感染率下降。即使在 4°C 保存 6 个月后，寄生虫仍能存活。寄生虫可能会适应较冷的温度，以在林线地区完成生命周期。
The Japanese rock ptarmigan, Lagopus muta japonica, inhabits the alpine zone of mountainous areas at 3000 m above sea level. Since L. m. japonica is endangered due to a decline in the overall population, controlling infectious diseases such as those caused by protozoan parasites is a critical factor in the conservation of this species. Although Eimeria spp. are considered to have a negative impact on Japanese rock ptarmigan populations, the ecological interactions between the parasites and their hosts have not yet been fully clarified. We therefore conducted seasonal surveys of the prevalence of Eimeria spp. in Japanese rock ptarmigan populations. In addition, we recorded the ambient temperature in ptarmigan habitat and characterized the ability of eimerian isolates to acquire infectivity. Eimeria spp. were detected in 217 of 520 (41.7%) Japanese rock ptarmigan fecal samples in 2006 and in 177 of 308 (57.5%) fecal samples in 2007. Specifically, we observed two types of oocysts characteristic of E. uekii and type B. In adult birds and chicks, infection rates increased towards August (summer) and then decreased as the temperature decreased toward November (winter). Oocyst counts per gram (OPG) of feces peaked in August in adults and chicks, and OPG values were markedly higher in chicks than in adults. Isolated Eimeria spp. oocysts sporulated at temperatures as low as 8 °C and remained viable after being stored at 4 °C for 6 months. Our findings suggest that Eimeria spp. can complete their annual lifecycle in the cold timberline regions inhabited by the host, the Japanese rock ptarmigan, and that Eimeria spp. infection is widespread in the bird populations examined. Two type oocysts, E. uekii and type B, highly infected Japanese rock ptarmigans. Infection rates increased towards summer and decreased as the temperature decreased toward winter. Parasites remained viable even after being stored at 4 °C for 6 months. Parasites may be adapted to colder temperature to complete life cycle at the timberline regions.
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影响因子：
2
作者：
Skirnisson, K.;Thorarinsdottir, S. Th.
通讯作者：
Thorarinsdottir, S. Th.
DOI：
10.2326/jjo.56.93
发表时间：
2007-10-01
期刊：
Japanese Journal of Ornithology
影响因子：
--
作者：
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通讯作者：
Nakamura, Hiroshi
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1.2
作者：
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通讯作者：
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3.7
作者：
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通讯作者：
Stefansson, Gunnar
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2.6
作者：
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Ono, K