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Glutz von Blotzheim, U.N.

Finden Gartenrotschwänze Phoenicurus phoenicurus noch überall genügend Insekten, um erfolgreich Junge aufzuziehen?

2015

112

51–56

Key words
(von 1994 bis 2006 vergeben)

Bruterfolg, Nahrungsangebot, Beeren, Insekten

Schlagwort_Vogelart
(wissenschaftlich)

Phoenicurus phoenicurus

Schlagwort_Vogelart
(deutsch)

Gartenrotschwanz

Schwyz, Schweiz

deutsch

Abhandlung

Are there sufficent insects available everywhere for the successful breeding of Common Redstarts Phoenicurus phoenicurus? – A breeding pair of Common Redstarts lost its six first brood nestlings through malnutrition. During the last four days before fledging, the nestlings of the replacement clutch got at least 183 fruit of bird cherry Prunus padus in addition to their insect diet. After fledging this fruit was almost the exclusive provision during a series of rainy days. The parents also swallowed a great amount of bird cherries. Even under favourable meteorological conditions a lot of fruit was fed or consumed. The young birds were only fed insects during the mid-day hours of a very sunny day, when the young Redstarts and up to three Common Blackbirds had to interrupt their sunbathing at short intervals to recover in the shadow of nearby bushes. Until now, fruit as nestling diet has been mentioned as a supplement in small quantities, or as alternative food source in an emergency situation. My observations may suggest an alarming decrease of available insects. A combination of unfavourable weather conditions and lack of alternative food could be a significant reason for insufficient recruitment of young birds.