کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6793635 1432737 2018 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Testosterone production and social environment vary with breeding stage in a competitive female songbird
ترجمه فارسی عنوان
تولید تستوسترون و محیط اجتماعی متفاوت است با مرحله پرورش در رقص زنانه رقصنده
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی علوم غدد
چکیده انگلیسی
In many vertebrates, males increase circulating testosterone (T) levels in response to seasonal and social changes in competition. Females are also capable of producing and responding to T, but the full extent to which they can elevate T across life history stages remains unclear. Here we investigated T production during various breeding stages in female tree swallows (Tachycineta bicolor), which face intense competition for nesting sites. We performed GnRH and saline injections and compared changes in T levels 30 min before and after injection. We found that GnRH-injected females showed the greatest increases in T during territory establishment and pre-laying stages, whereas saline controls dramatically decreased T production during this time. We also observed elevated rates of conspecific aggression during these early stages of breeding. During incubation and provisioning, however, T levels and T production capabilities declined. Given that high T can disrupt maternal care, an inability to elevate T levels in later breeding stages may be adaptive. Our results highlight the importance of saline controls for contextualizing T production capabilities, and they also suggest that social modulation of T is a potential mechanism by which females may respond to competition, but only during the period of time when competition is most intense. These findings have broad implications for understanding how females can respond to their social environment and how selection may have shaped these hormone-behavior interactions.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Hormones and Behavior - Volume 103, July 2018, Pages 28-35
نویسندگان
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