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Evidence of incubation trade-offs in Leach's Storm-Petrel (Oceanodroma leucorhoa): ptilochronology as a measure of reproductive investment in a long-lived seabird
IBIS ( IF 2.1 ) Pub Date : 2020-12-30 , DOI: 10.1111/ibi.12912
Lisa H. Elliott 1, 2 , Jennifer Grady 1, 3 , Jack Cerchiara 4 , Mark F. Haussmann 1, 5 , Robert A. Mauck 1
Affiliation  

Avian incubation investment represents a trade-off between the energetic demands of the parent and the thermal needs of the embryo. Parental energy balance and investment in somatic maintenance relative to incubation investment can be indexed by the rate of feather growth. Feather growth rates, or ptilochronology, of adult Leach's Storm-Petrels Oceanodroma leucorhoa were used to assess parental investment to (1) determine whether individuals that invest heavily in current reproduction pay a cost for future reproduction as indicated by a cost for somatic maintenance and (2) assess whether this trade-off is detected using ptilochronology, which may be a more direct measure of reproductive investment compared with body mass in seabirds. We found positive relationships between duration of the incubation period and both egg neglect and a mated pair's mean rate of induced feather growth, although we did not find a relationship between either egg neglect and feather growth or hatching success and feather growth. Our results suggest that during the incubation period a trade-off exists between energy allocated to self-maintenance and reproduction in this species, although egg neglect does not appear to be the mechanism that extends the incubation period in response to increased energetic demands of somatic maintenance. The lack of correlation between feather growth and egg neglect further suggests that some pairs may be better able to manage competing demands of self-maintenance and incubation, possibly due to individual quality, coordination of incubation effort, burrow quality or some other factor.

中文翻译:

Leach's Storm-Petrel (Oceanodroma leucorhoa) 孵化权衡的证据:年代学作为长寿命海鸟繁殖投资的衡量标准

禽类孵化投资代表了亲本能量需求和胚胎热量需求之间的权衡。相对于孵化投资,父母的能量平衡和体细胞维持投资可以通过羽毛生长速度进行索引。成年 Leach's Storm-Petrels Oceanodroma leucorhoa 的羽毛生长率或年代学用于评估亲本投资,以 (1) 确定对当前繁殖进行大量投资的个人是否为未来的繁殖支付成本,如体细胞维持成本所示,以及 (2) 评估是否使用年代学检测到这种权衡,这可能与海鸟的体重相比,这是一种更直接的生殖投资衡量标准。我们发现孵化期的持续时间与鸡蛋忽视和配对的诱导羽毛生长的平均速率之间存在正相关关系,尽管我们没有发现鸡蛋忽视与羽毛生长或孵化成功与羽毛生长之间的关系。我们的结果表明,在潜伏期内,该物种在分配给自我维持和繁殖的能量之间存在权衡,尽管忽略卵子似乎不是延长孵化期以响应增加的体细胞维持能量需求的机制。羽毛生长和鸡蛋忽视之间缺乏相关性进一步表明,某些配对可能能够更好地管理自我维护和孵化的竞争需求,这可能是由于个体质量、孵化工作的协调、洞穴质量或其他一些因素。
更新日期:2020-12-30
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