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- W2954950340 abstract "During migration birds are exposed to several challenges, one of these are the potential threat of getting oxidative stressed. Oxidative stress can be defined as when free radicals are produced in a vastly amount so antioxidants cannot detoxify them. This is the case at higher metabolic rate such as migratory flight, and probably during hyperphagia at stop-over. The aim of this paper was to investigate the oxidative condition in northern wheatears (O. oenanthe) at stop-over. Does oxidative stress decrease at stop-over, and what could this potential decrease depend on? Could it depend on an upregulation in antioxidant capacity? Or is it possible that wheatears do not increase ROS at hyperphagia and therefore that rest i.e. lower metabolic rate could be responsible for the decrease? Wheatears were caught at Helgoland, a German offshore island, during spring migration and kept in cages with ad libitum amount of food. Two blood samples were taken with two days in-between. The results show new and intriguing data about how birds cope with oxidative stress at stop-over. There was a significant decrease in lipid damage (MDA), however no change in non-enzymatic antioxidants (AOX) between the blood samples. Wheatears do not seem to suffer from increased ROS production during hyperphagia since MDA nor AOX correlated with fuel deposition rate or total food intake. The change in MDA was not related to change in AOX. Taken together, the decrease in MDA seems to depend on rest due to lower metabolic rate rather than an upregulation in antioxidants. In addition, there was an among individual variation where wheatears that arrive in poor oxidative state can decrease their MDA concentration substantially. This result shows that birds arriving in poor oxidative condition can improve well enough for oncoming flight. Oxidative stress is seldom considered in the area of migration, however new knowledge in this field could perhaps explain some migratory behaviour, e.g. using poor stop-over sites. (Less)" @default.
- W2954950340 created "2019-07-12" @default.
- W2954950340 creator A5014507272 @default.
- W2954950340 date "2019-01-01" @default.
- W2954950340 modified "2023-09-27" @default.
- W2954950340 title "Northern wheatears (Oenanthe oenanthe) decrease oxidative stress at stop-over during spring migration" @default.
- W2954950340 hasPublicationYear "2019" @default.
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