Jichao Wang, Yuxiang Liu, J. Fong, J. F. Parham, H. Shi
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引用次数: 0
摘要
摘要2000 ~ 2002年在海南岛对濒危物种海南四眼斑龟(Sacalia insulensis)的生殖生态进行了研究。共捕获147只成年雌性,通过触诊、x线成像和超声评估其生殖状况。22只怀孕的雌性在产卵时进行了观察。在12月至4月期间,我们观察了雌龟在溪流岸边的怀孕和筑巢行为。巢的直径为5至6厘米,深度为2至3厘米。在我们的研究中,没有一只雌性每一季产超过1窝卵。平均卵数为1.9粒(范围= 1 ~ 3粒,SD = 0.56, n = 22),平均卵重16.05 g(范围= 11.8 ~ 21.0 g, SD = 2.417, n = 21),平均卵宽2.36 cm(范围= 2.1 ~ 2.7 cm, SD = 0.135, n = 21),平均卵长4.65 cm(范围= 3.9 ~ 5.3 cm, SD = 0.400, n = 21)。孵化成功率53%,6月下旬至7月上旬平均孵化120.9 d(范围98 ~ 148 d, SD = 14.94, n = 21)。平均地温为24.43℃(范围15.0℃~ 30.2℃,SD = 2.712, n = 7)。
Reproductive Ecology of the Hainan Four Eye-Spotted Turtle (Sacalia insulensis) on Hainan Island, China
Abstract. From 2000 to 2002, the reproductive ecology of the endangered Hainan four eye-spotted turtle (Sacalia insulensis) was studied on Hainan Island, China. A total of 147 adult females were captured, and their reproductive status was evaluated by palpation, X-ray imaging, and ultrasound. Twenty-two gravid females were under observation when they laid their eggs. We observed gravid females and nesting behavior along stream banks between December and April. Nest dimensions ranged from 5 to 6 cm in diameter and from 2 to 3 cm in depth. No females in our study produced more than 1 clutch per season. Clutch size average was 1.9 eggs (range = 1–3 eggs, SD = 0.56, n = 22) with an average egg mass of 16.05 g (range = 11.8–21.0 g, SD = 2.417, n = 21), an average egg width of 2.36 cm (range = 2.1–2.7 cm, SD = 0.135, n = 21), and an average length of 4.65 cm (range = 3.9–5.3 cm, SD = 0.400, n = 21). Hatching success rate was 53%, and hatchlings emerged after an average of 120.9 d (range = 98–148 d, SD = 14.94, n = 21) in late June to early July. The mean nesting site ground temperature was 24.43°C (range = 15.0°C–30.2°C, SD = 2.712, n = 7).