Lormée H, Jouventin P, Lacroix A, Lallemand J, Chastel O
Centre d'Etudes Biologiques de Chizé, Centre National de la Recherche Scientifique, Villiers en Bois, France.
Gen Comp Endocrinol. 2000 Mar;117(3):413-26. doi: 10.1006/gcen.1999.7434.
Plasma levels of luteinizing hormone, prolactin, testosterone, and progesterone were measured throughout breeding in masked boobies, red-footed boobies, and red-tailed tropicbirds at Europa and Tromelin Islands (Indian Ocean). LH secretion showed a dampened pattern in the three species, particularly in tropicbirds. Such specific differences may be related to the less elaborate courtship displays in tropicbirds. Testosterone levels were very low throughout breeding in all three species, particularly in boobies. Low testosterone values in boobies may be related to their year-round attendance at the colony. Prolactin secretion increased from the prelaying period until the incubation and brooding periods and declined thereafter in boobies but stayed relatively unchanged throughout the breeding cycle in tropicbirds. The relatively constant prolactin secretion in the more pelagic tropicbirds might allow them to undertake parental care despite long absences at sea. Boobies perform postfledging care with basal prolactin levels. For all species, females always have higher prolactin levels than males. This hormonal dimorphism, being more pronounced in boobies, may be associated with differences in parental care between mates.
在印度洋的欧罗巴岛和特罗梅林岛，对蒙面鲣鸟、红脚鲣鸟和红尾鹲在整个繁殖期的促黄体生成素、催乳素、睾酮和孕酮的血浆水平进行了测量。促黄体生成素的分泌在这三个物种中呈现出减弱的模式，特别是在鹲中。这种特定的差异可能与鹲不太复杂的求偶展示有关。在所有三个物种的整个繁殖期，睾酮水平都非常低，特别是在鲣鸟中。鲣鸟的低睾酮值可能与其全年在繁殖地有关。催乳素的分泌在鲣鸟中从产卵前期到孵化期和育雏期增加，此后下降，但在鹲的整个繁殖周期中保持相对不变。在更远洋的鹲中，催乳素分泌相对恒定，这可能使它们尽管长时间出海也能进行育雏。鲣鸟在雏鸟离巢后以基础催乳素水平进行育雏。对于所有物种，雌性的催乳素水平总是高于雄性。这种激素二态性在鲣鸟中更为明显，可能与配偶之间育雏行为的差异有关。
