Study

Body-mass variation in breeding northern wheatears: a field experiment with supplementary food

  • Published source details Moreno J. (1989) Body-mass variation in breeding northern wheatears: a field experiment with supplementary food. The Condor, 91, 178-186.

Actions

This study is summarised as evidence for the following.

Action Category

Provide supplementary food for birds or mammals

Action Link
Farmland Conservation

Provide supplementary food for songbirds to increase adult survival

Action Link
Bird Conservation
  1. Provide supplementary food for birds or mammals

    A replicated and controlled study in the breeding seasons of 1985-1987 in grasslands on Öland, southern Sweden (Moreno 1989), found that female northern wheatear Oenanthe oenanthe, but not males, that were provided with supplementary food were significantly heavier than unfed controls (average of 26.9 g for 53 fed females and 24.4 g for 42 fed males vs 24.3 g and 23.7 g for 48 and 32 unfed controls). However, there was no effect when females were feeding older chicks, which were able to regulate their body temperature. A few days after hatching, most food was delivered to chicks, not consumed by adults. Food consisted of 7 g of mealworms provided either during incubation, or for the entire breeding season.

     

  2. Provide supplementary food for songbirds to increase adult survival

    A replicated and controlled study in the breeding seasons of 1985-7 in grasslands on Öland, southern Sweden (Moreno 1989), found that female northern wheatears Oenanthe oenanthe, but not males, that were provided with supplementary food were significantly heavier than unfed controls (average of 26.9 g for 53 fed females and 24.4 g for 42 fed males vs. 24.3 g and 23.7 g for 48 and 32 unfed controls). However, there was no effect when females were feeding older chicks, (after they were able to regulate their body temperature. A few days after hatching, most food was delivered to chicks, not consumed by adults. Food consisted of 7 g of mealworms provided either during incubation, or for the entire breeding season.

     

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