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    Wyświetlanie 1-10 z 10
    Tytuł:
    Environmental cues and dietary antioxidants affect breeding behavior and testosterone of male European starlings (Sturnus vulgaris)
    Autorzy:
    Trost, Lisa
    McWilliams, Scott R.
    DeMoranville, Kristen J.
    Działo, Maciej
    Goymann, Wolfgang
    Carbeck, Katherine M.
    Pierce, Barbara
    Bryła, Amadeusz
    D'Amelio, Pietro B.
    Bauchinger, Ulf
    Opis:
    Environmental cues, such as photoperiod, regulate the timing of major life-history events like breeding through direct neuroendocrine control. Less known is how supplementary environmental cues (e.g., nest sites, food availability) interact to influence key hormones and behaviors involved in reproduction, specifically in mi- gratory species with gonadal recrudescence largely occurring at breeding sites. We investigated the behavioral and physiological responses of male European starlings to the sequential addition of nest boxes and nesting material, green herbs, and female conspecifics and how these responses depend on the availability of certain antioxidants (anthocyanins) in the diet. As expected, cloacal protuberance volume and plasma testosterone of males generally increased with photoperiod. More notably, testosterone levels peaked in males fed the high antioxidant diet when both nest box and herbal cues were present, while males fed the low antioxidant diet showed no or only a muted testosterone response to the sequential addition of these environmental cues; thus our results are in agreement with the oxidation handicap hypothesis. Males fed the high antioxidant diet maintained a constant frequency of breeding behaviors over time, whereas those fed the low antioxidant diet decreased breeding behaviors as environmental cues were sequentially added. Overall, sequential addition of the environmental cues modulated physiological and behavioral measures of reproductive condition, and dietary antioxidants were shown to be a key factor in affecting the degree of response to each of these cues. Our results highlight the importance of supplementary environmental cues and key resources such as dietary antioxidants in enhancing breeding condition of males, which conceivably aid in attraction of high quality females and reproductive success.
    Dostawca treści:
    Repozytorium Uniwersytetu Jagiellońskiego
    Artykuł
    Tytuł:
    Flight training and dietary antioxidants have mixed effects on the oxidative status of multiple tissues in a female migratory songbird
    Autorzy:
    DeMoranville, Kristen J.
    Trost, Lisa
    Pierce, Barbara J.
    Działo, Maciej
    Bryła, Amadeusz
    Frawley, Abigail E.
    McWilliams, Scott R.
    Carbeck, Katherine M.
    Bauchinger, Ulf
    Sadowska, Edyta
    Opis:
    Birds, like other vertebrates, rely on a robust antioxidant system to protect themselves against oxidative imbalance caused by energy-intensive activities such as flying. Such oxidative challenges may be especially acute for females during spring migration, since they must pay the oxidative costs of flight while preparing for reproduction; however, little previous work has examined how the antioxidant system of female spring migrants responds to dietary antioxidants and the oxidative challenges of regular flying. We fed two diets to female European starlings, one supplemented with a dietary antioxidant and one without, and then flew them daily in a windtunnel for two weeks during the fall and spring migration periods. We measured the activity of enzymatic antioxidants (GPx, SOD, CAT), non-enzymatic antioxidant capacity (ORAC), and markers of oxidative damage (protein carbonyls and lipid hydroperoxides) in four tissues: pectoralis, leg, liver, and heart. Dietary antioxidants affected enzymatic antioxidant activity and lipid damage in the heart, non-enzymatic antioxidant capacity in the pectoralis, and protein damage in leg muscle. In general, birds fed less antioxidants appear to incur increased oxidative damage while upregulating non-enzymatic and enzymatic antioxidant activity, though these effects were strongly tissue-specific. We also found trends for diet x training interactions for enzymatic antioxidant activity in the heart and leg. Flight-training may condition the antioxidant system of females to dynamically respond to oxidative challenges, and females during spring migration may shift antioxidant allocation to reduce oxidative damage.
    Dostawca treści:
    Repozytorium Uniwersytetu Jagiellońskiego
    Artykuł
    Tytuł:
    Season, anthocyanin supplementation, and flight training have mixed effects on the antioxidant system of migratory European Starlings
    La estación, la suplementación con antocianinas y el entrenamiento de vuelo tienen efectos mixtos sobre el sistema antioxidante de los individuos migratorios de Sturnus vulgaris
    Autorzy:
    Frawley, Abigail E.
    Bauchinger, Ulf
    Bryła, Amadeusz
    DeMoranville, Kristen J.
    Działo, Maciej
    Carbeck, Katherine M.
    Pierce, Barbara J.
    Trost, Lisa
    McWilliams, Scott R.
    Sadowska, Edyta
    Dostawca treści:
    Repozytorium Uniwersytetu Jagiellońskiego
    Artykuł
      Wyświetlanie 1-10 z 10

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