摘要
The main purpose of this study was to describe the intrinsic (breeding) and extrinsic factors (rainfall/vegetation) that might trigger movements of Double-banded Sandgrouse (Pterocles bicinctus) in Borakalalo National Park, South Africa. The park is situated 80 km north of Pretoria and 30 km north of Jericho in the North West province. Data collection was based on traversing the reserve for two days per month along a set route (32 km) with a vehicle at 10 km·h 1 during 2010. The mean group size of this Double-banded Sandgrouse was 2.47. The male to female ratio in the population was 1:0.87. They were often observed in the road, on short trampled grass or in burnt thornvelds with green sprouts. Double-banded Sandgrouse were mainly present in the reserve during two relatively dry periods, from February––MMMaaarrrccchhh and again from July––SSSeeepppttteeemmmbbbeeerrr 2010. They wwwwweeeeerrrrreeeee more regularly observed in the hinterland of the park in the mornings and conversely, during the late afternoons they were more regularly observed closer to the edge of the Klipvoor Dam. Five possible reasons are discussed that may affect the movement of the Double-banded Sandgrouse: annual rainfall, short spells of high/low rainfall periods within the rainy season, daily flights of 2–4 km to drink water, breeding and veld conditions.
本文旨在描述可能引起南非Borakalalo国家公园内二斑沙鸡(Pterocles bicinctus)迁移行为的内在(繁殖)及外在因素(降雨量及植被情况)。该公园位于西北省比勒陀利亚以北80km,Jericho以北30km处。2010年,采取乘车辆沿固定路线穿越该保护区的方式搜集数据。车速为每小时10km,固定路线长为32km,调查强度为每月2天。二斑沙鸡平均每群2.47个个体。种群内雄性与雌性的比例为1:0.87。该鸟常出现在路边、遭踩踏过的矮草丛中或经焚烧但长出新叶的金合欢丛中。二斑沙鸡在该保护区主要出现在两个相对干燥的季节,即2–3月及7–9月。早晨在该公园的腹地能更多地观察到该鸟,而下午晚些时候,在Klipvoor河坝的水体边则可多见该鸟。讨论了可能影响二斑沙鸡迁移的5个因素,包括年降雨量、雨季中短时雨量大小、2–4km的日间饮水飞行、繁殖及草原植被情况。
