کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2800715 1156122 2012 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Migratory carryover effects and endocrinological correlates of reproductive decisions and reproductive success in female albatrosses
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی علوم غدد
پیش نمایش صفحه اول مقاله
Migratory carryover effects and endocrinological correlates of reproductive decisions and reproductive success in female albatrosses
چکیده انگلیسی

Physiological mechanisms mediating carryover effects, wherein events or activities occurring in one season, habitat, or life-history stage affect important processes in subsequent life-history stages, are largely unknown. The mechanism most commonly invoked to explain carryover effects from migration centres on the acquisition and utilization of resources (e.g. body mass, or individual ‘condition’). However, other mechanisms are plausible, e.g. trade-offs reflecting conflict or incompatibility between physiological regulatory systems required for different activities or life-history stages (migration vs. reproduction). Here we show that in female black-browed albatrosses (Thalassarche melanophris) the decision to reproduce or to defer reproduction, made prior to their arrival at breeding colonies after long-distance migration, is associated with condition-related (body mass, hematocrit, hemoglobin concentrations) and hormonal (progesterone, testosterone, estrogen-dependent yolk precursors) traits. In contrast, reproductive success showed little association with condition but showed significant associations with the steroidogenic processes underlying follicle development. Specifically, success was determined by reproductive readiness via differences in steroid hormones and hormone-dependent traits. Successful albatrosses were characterized by high progesterone and high estradiol-dependent yolk precursor levels, whereas failed albatrosses had high testosterone and low yolk precursor levels. Results are discussed with reference to migratory carryover effects and how these can differentially affect the physiologies influencing reproductive decisions and reproductive success.


► Breeding decisions and success are influenced by two different mechanisms in female albatrosses.
► Upon arrival at a breeding colony females had already decided whether or not to breed.
► Breeding deferral was condition and hormone dependent with low body mass, hematocrit, and P4.
► Breeding success however was not related to condition but to disruption of E2 vitellogenic pathways.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: General and Comparative Endocrinology - Volume 176, Issue 2, 1 April 2012, Pages 151–157
نویسندگان
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