Phenotypic correlates of post-fledging dispersal in a population of greater flamingos: the importance of body condition
Phenotypic correlates of post-fledging dispersal in a population of greater flamingos: the importance of body condition
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DOI：
10.1046/j.1365-2656.2003.00695.x
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发表时间：
2003-03-01
影响因子：
4.8
通讯作者：
Bertault, G
中科院分区：
文献类型：
--
作者：
Barbraud, C;Johnson, AR;Bertault, G
1.对1999.2-1995年在法国南部卡马格出生的红腹火烈鸟和它们的主要越冬地(西班牙、撒丁岛、突尼斯和法国)之间的个别标记的大火烈鸟(凤凰红腹火烈鸟)在第一次繁殖尝试之前影响羽化后活动的因素进行了研究。我们使用多状态捕获-再捕获模型方法检验幼年后的扩散是否受到性别、年龄、年份、身体状况、身体质量和足踝长度的影响。我们特别关注这样的假设，即运动概率的增加与身体状况的好坏有关。由于远距离迁徙耗费巨大的能量，而且可能涉及很高的死亡风险，因此，在迁徙前获得强健的身体状况可能在决定动物迁徙的程度上起着关键作用。在另一个极端，条件较差的鸟类要么离开它们的出生地，要么挨饿，这应该会导致相对较高的分散率。搬家概率与性别无关，但与年龄有关，出生第一年的搬家概率较高(大于0.6%)，出生一年后的搬家概率较低(0.055)。不同年份和不同地区的流动概率也不同。幼体的活动概率与幼鱼的身体状况(和体质量)有关，幼体状况良好时，活动概率较高(0.873)，而状况较差时，活动概率较低(0.629~0.724)。体况和体质量对散布变异的解释比例分别为90.9%和63.5%。结果支持这一假设，即条件影响出生地区的扩散模式。他们还表明，早期生长期间的身体条件和当地环境条件对扩散起到了作用。
1. Factors influencing post-fledging movements before the first breeding attempt were studied in individually marked greater flamingos (Phoenicopterus ruber roseus ) born in the Camargue, southern France, between their natal area and their principal wintering grounds (Spain, Sardinia, Tunisia and France) from 1995 to 1999.2. We tested whether post-fledging dispersal was affected by sex, age, year, body condition, body mass and tarsus length using a multistate capture-recapture modelling approach. We focused particularly on the hypothesis that increased movement probabilities were associated with good and poor body condition. Because long-distance dispersal is energetically expensive and may involve a high risk of mortality, the acquisition of a robust physical condition prior to dispersal probably plays a critical role in determining the extent to which animals disperse. At the other extreme, birds in poor condition either leave their natal area or starve, which should result in relatively high dispersal rates.3. Movement probabilities were not sex-dependent, but were age-dependent with high movement probabilities during the first year of life (above 0.6) and low probabilities after the first year (0.055). Movement probabilities also differed between years and localities.4. Movement probability from the natal area was related to the body condition (and body mass) of the fledglings, with a high movement probability (0.873) when juveniles were in good body condition, and a relatively lower probability (from 0.629 to 0.724) when juveniles were in poorer condition. The proportion of variability in dispersal explained by body condition and body mass were 90.9% and 63.5%, respectively.5. Results support the hypothesis that condition affects dispersal patterns from the natal area. They also suggest that body condition and local environmental conditions during the early growth play a role in dispersal.