کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
323375 540628 2016 10 صفحه PDF سفارش دهید دانلود کنید
عنوان انگلیسی مقاله ISI
Yolk testosterone affects growth and promotes individual-level consistency in behavioral lateralization of yellow-legged gull chicks
ترجمه فارسی عنوان
تستوسترون زرده اثرگذار بر رشد و ترویج ثبات در سطح فردی در برتری جانبی رفتاری جوجه های کاکایی پازرد
کلمات کلیدی
michahellis Larus؛ جانبی؛ اثر مادری؛ جانبی در سطح جمعیت؛ تستوسترون
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی علوم غدد
چکیده انگلیسی


• We tested the effect of egg testosterone on behavioral lateralization of gull chicks.
• A physiological dose of testosterone did not affect the direction of lateralization.
• Testosterone treatment caused more consistent individual-level lateral preference.
• We found no evidence for sex-dependent or population-level lateralization.

Behavioral lateralization is common in animals and may be expressed at the individual- and at the population-level. The ontogenetic processes that control lateralization, however, are largely unknown. Well-established sex-dependence in androgen physiology and sex-dependent variation in lateralization have led to the hypothesis that testosterone (T) has organizational effects on lateralization. The effects of T exposure in early life on lateralization can be efficiently investigated by manipulating T levels in the cleidoic eggs of birds, because the embryo is isolated from maternal and sibling physiological interference, but this approach has been adopted very rarely. In the yellow-legged gull (Larus michahellis) we increased yolk T concentration within the physiological limits and tested the effects on the direction of lateralization in two functionally fundamental behaviors (begging for parental care and escape to cover) of molecularly sexed hatchlings. We also speculated that T may intervene in regulating consistency, rather than direction of lateralization, and therefore tested if T affected the ‘repeatability’ of lateral preference in consecutive behavioral trials. T treatment had no effect on the direction of lateralization, but enhanced the consistency of lateral preference in escape responses. Sex did not predict lateralization. Neither behavior was lateralized at the population-level. We therefore showed for the first time in any species an effect of egg T on consistency in lateralization. The implications of the effect of T for the evolution of trade-offs in maternal allocation of egg hormones, and the evolutionary interpretations of findings from our studies on lateralization among unmanipulated birds are discussed.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Hormones and Behavior - Volume 80, April 2016, Pages 58–67
نویسندگان
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