White-breasted Cormorant, Phalacrocorax carbo, breeding season timing and its control factors at a seasonally constant Kenyan lake
White-breasted Cormorant, Phalacrocorax carbo, breeding season timing and its control factors at a seasonally constant Kenyan lake
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肯尼亚季节性恒定湖中白胸鸬鹚 (Phalacrocorax carbo) 的繁殖季节时间及其控制因素
DOI：
10.2989/00306520109485308
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发表时间：
2001
期刊：
影响因子：
1
通讯作者：
L. Bennun
中科院分区：
文献类型：
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作者：
R. Childress;L. Bennun
在肯尼亚奈瓦沙湖（00° 46′S，36° 22′E）附近的一个新的900巢群体中，记录了白胸鸬鹚在两个繁殖季节（1995/96）的环境因素和繁殖活动。据报道，该物种的繁殖全年都在东非赤道附近发生。其他研究表明，白胸鸬鹚主要在4月至6月期间在整个撒哈拉以南非洲繁殖，无论当地气候状况或光周期趋势的差异如何。在奈瓦沙湖，繁殖也主要发生在4月至6月。在此期间，没有证据表明猎物丰度的季节性增加，而且时间与任何其他环境变化无关，例如降雨量，湖泊水位或透明度，每日光周期或环境空气温度。然而，主要降雨的开始似乎是一个可能的刺激，以繁殖准备在人口作为一个整体。有人建议，繁殖时间在奈瓦沙湖可能会受到亚种的近12个月的内源性生殖周期和每年触发通过当地的环境因素，可能是主要降雨的发病相结合。
Environmental factors and breeding activity of the White-breasted Cormorant were documented over two breeding seasons (1995/96) at a new 900-nest colony near Lake Naivasha, Kenya (00° 46′S, 36° 22′E), a non-seasonal lake. Breeding of this species has been reported to occur year-round near the equator in East Africa. Other studies suggest that the White-breasted Cormorant breeds mainly during April–June throughout sub-Saharan Africa, irrespective of the local climatic regime or differences in photoperiod trend. At Lake Naivasha, breeding also occurred primarily during April–June. There was no evidence of a consistent seasonal increase in prey abundance during this period, and the timing was not linked consistently to any other environmental changes, such as amount of rainfall, lake water level or transparency, daily photoperiod, or ambient air temperature. Onset of the main rains, however, appeared to be a possible stimulant to breeding readiness in the population as a whole. It is suggested that breeding timing at Lake Naivasha may be influenced by a combination of the subspecies' nearly 12-month endogenous reproductive cycle and an annual trigger through a local environmental factor, possibly the onset of the main rains.
小和田：癣。
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