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首页> 外文期刊>The Wilson Bulletin >INTENSITY AND CHRONOLOGY OF POSTREPRODUCTIVE MOLTS IN MALE CANVASBACKS
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INTENSITY AND CHRONOLOGY OF POSTREPRODUCTIVE MOLTS IN MALE CANVASBACKS

机译：男性背足繁殖后生殖的强度和年代学

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摘要

We studied molt intensity and chronology in male Canvasbacks (Aythya val-isineria) from termination of reproductive activities until fall migration (May-October) in 1989-1990. During this period, male Canvasbacks underwent prebasic, down, and partial prealternate molts. Males arrived on molting habitat already undergoing light prebasic molt. Total molt intensity increased to moderate levels in late preflightless birds and remained at this intensity through the postflightless period. Contour plumage molt intensity was reduced in staging birds concurrent with declining ambient temperatures and fall migration. Prebasic body molt was most intense in late preflightless birds, while peak prealternate molt occurred during the postflightless period. Remigial molt occurred from late July through August near completion of prebasic body molt. Prealternate molt began concurrent with late remigial molt and was not completed in male Canvasbacks before fall migration from central Alberta. Synchrony in the timing of remigial and prealternate molts suggests that these molts were probably under photoperiodic regulation in male Canvasbacks. Down replacement occurred throughout the postreproductive period but reached peak intensity in late preflightless, flightless, and postflightless birds. Only light down molt still occurred in staging Canvasbacks. All male Canvasbacks examined underwent the normal progression of postreproductive molts regardless of age; however, yearling males initiated prebasic molt earlier than birds ≥ 2 years old. Male Canvasbacks extended postreproductive molts over a period of six months which minimized the daily nutritional requirements for plumage growth.
机译：我们研究了从1989年到1990年从繁殖活动终止到秋季迁徙（5月至10月）的雄性Canvasbacks（Aythya val-isineria）的蜕皮强度和年代。在此期间，雄性Canvasbacks经历了基础，羽绒和部分交替的蜕皮。雄性到达已经蜕变的栖息地，已经进行了轻度的基础蜕皮。晚期非飞行前家禽的总蜕皮强度增加到中等水平，并且在整个非飞行后时期一直保持这种强度。在环境温度下降和秋季迁徙的同时，禽类的轮廓羽毛蜕皮强度降低。晚期无飞行前鸟类的基体蜕皮活动最激烈，而无飞行后阶段的前代蜕皮高峰。迁移性蜕皮发生在7月下旬至8月，接近基础蜕皮期。早产蜕皮开始与晚移居蜕皮同时发生，并且在秋季从亚伯达省中部迁徙之前在雄性坎布巴克斯还没有完成。迁徙和候生的同步发生表明，这些Can可能在雄性黑背Can中处于光周期调节之下。羽绒替代发生在整个繁殖后时期，但在后期的飞行前，飞行不正常和飞行后鸟类中达到峰值强度。在分阶段进行Canvasbacks时，仍然只有轻度蜕皮。无论年龄大小，所有接受检查的雄性Canvasback均经历了生殖后蜕皮的正常进展。然而，一岁雄性早于≥2岁的鸟类开始进行基础蜕皮。雄性黑背extended将生殖后的蜕皮延长了六个月，这使羽毛生长的日常营养需求降至最低。

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