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Testing hypotheses about the function of repeated nest abandonment as a life history strategy in a passerine bird

机译：测试关于重复弃巢作为雀形目鸟生活史策略的功能的假设

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Nest structures are essential for successful reproduction in most bird species. Nest construction costs time and energy, and most bird species typically build one nest per breeding attempt. Some species, however, build more than one nest, and the reason for this behaviour is often unclear. In the Grey Fantail Rhipidura albiscapa, nest abandonment before egg-laying is very common. Fantails will build up to seven nests within a breeding season, and pairs abandon up to 71% of their nests before egg-laying. We describe multiple nest-building behaviour in the Grey Fantail and test four hypotheses explaining nest abandonment in this species: cryptic depredation, destruction of nests during storm events, and two anti-predatory responses (construction of decoy nests to confuse predators, and increasing concealment to hide' nests more effectively). We found support for only one hypothesis - that abandonment is related to nest concealment. Abandoned nests were significantly less concealed than nests that received eggs. Most abandoned nests were not completely built and none received eggs, thus ruling out cryptic predation. Nests were not more likely to be abandoned following storm events. The decoy nest hypothesis was refuted as abandoned nests were constructed at any point during the breeding season and some nests were dismantled and the material used to build the subsequent nest. Thus, Grey Fantails are flexible about nest-site locations during the nest-building phase and readily abandon nest locations if they are found to have deficient security.
机译：巢结构对于大多数鸟类的成功繁殖至关重要。筑巢会耗费时间和精力，大多数鸟类通常会在每次繁殖尝试中筑巢。但是，有些物种筑巢不止一个，这种行为的原因通常不清楚。在灰扇尾的Rhipidura albiscapa中，产卵前放弃巢很常见。扇尾将在繁殖季节内最多筑巢7个，在产卵前成对放弃多达71％的巢。我们在“灰色扇形尾巴”中描述了多种筑巢行为，并测试了四个假设来解释该物种的巢舍遗弃：神秘的掠食，风暴事件期间巢的破坏以及两个反掠夺性的响应（构造诱饵巢以迷惑捕食者，并增加了隐蔽性更有效地隐藏'巢穴）。我们发现仅支持一种假说-遗弃与巢藏有关。与接受鸡蛋的巢相比，被遗弃的巢的隐蔽性要低得多。大多数废弃的巢穴并未完全建成，也没有卵子，因此排除了神秘的掠食。风暴事件发生后，鸟巢不太可能被遗弃。诱饵巢假说被驳斥，因为在繁殖季节的任何时候都建造了废弃的巢，并拆除了一些巢，并使用了建造后续巢的材料。因此，灰色燕尾在筑巢阶段可以灵活地安排筑巢地点，如果发现它们的安全性不足，可以轻易放弃筑巢地点。

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