Endocrine influences on parental care during a short breeding season:: testosterone and male parental care in Lapland longspurs (Calcarius lapponicus)
Endocrine influences on parental care during a short breeding season:: testosterone and male parental care in Lapland longspurs (Calcarius lapponicus)
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DOI：
10.1007/s002650050572
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发表时间：
1999-04-01
影响因子：
2.3
通讯作者：
Wingfield, JC
中科院分区：
文献类型：
--
作者：
Hunt, KE;Hahn, TP;Wingfield, JC
在社会性一夫一妻制鸟类的雄性中，血浆睾酮（T）通常在亲代阶段下降到低水平。对多亲种的研究表明，高T可能与高质量的父本卡尔不相容。繁殖季节的长短可能会影响高T的成本和收益及其对父系卡尔的影响。我们研究了实验升高的T在一个单一的育雏物种，一个短的繁殖季节，拉普兰长距（Calcarius lapponicus）的父亲照顾的效果。我们监测T水平和父母的行为，在16名男性皮下T植入，14名男性与空的植入物，和14名未植入的男性。我们拍摄的巢时，雏鸟是2-3天大，再次在4-5天。T男性与2至3天大的年轻访问的巢和喂养的年轻人往往比对照组男性，和T男性的配偶补偿升高的访问和喂养。然而，当雏鸟4-5天大时，T雄性以正常的速率访问它们的巢-尽管进食动作仍然低于正常-T雌性以正常的速率访问和进食。两组的雏鸟质量和巢成功率相似。总的来说。高T抑制拉普兰长距雄性的父爱。当雏鸟年龄较大时，尽管T较高，但部分改善了父亲的护理，这可能与北极物种的短6周繁殖季节有关，因此在繁殖季节后期性行为的益处减少。
In males of socially monogamous birds, plasma testosterone (T) typically declines to low levels during the parental phase. Studies on multiple-brooded species indicate that high T may be incompatible with high-quality paternal carl. The length of the breeding season may affect the costs and benefits of high T and its effect on paternal carl. We studied the effect of experimentally elevated T on paternal care in a single-brooded species with a short breeding season, the Lapland longspur (Calcarius lapponicus). We monitored T levels and parental behavior in 16 males with subcutaneous T implants, 14 males with empty implants, and 14 unimplanted males. We videotaped nests when nestlings were 2-3 days old and again at 4-5 days. T males with 2- to 3-day-old young visited nests and fed young less often than control males, and the mates of the T males compensated with elevated visits and feedings. However, when nestlings were 4-5 days old, T males visited their nests at normal rates - though feeding movements remained below normal - and T females visited and fed at normal rates. Nestling mass and nest success were similar in both groups. Overall. high T suppresses paternal care in Lapland longspur males. The partial improvement of paternal care when nestlings are older, despite high T, may be related to the Short 6-week breeding season of this arctic species, and the consequently reduced benefits of sexual behavior late in the breeding season.