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Providing evidence to improve practice

Individual study: Effect of supplementary feeding on survival of varied tits Parus varius near Joetsu-shi, Chubu region, Japan

Published source details

Nakamura M. & Kubota H. (1998) Food supply in early spring and stability of pair bonds in the varied tit Parus varius. Journal of Avian Biology, 29, 201-205


This study is summarised as evidence for the intervention(s) shown on the right. The icon shows which synopsis it is relevant to.

Provide supplementary food for songbirds to increase adult survival Bird Conservation

A small controlled before-and-after trial in two mixed woodlands on Honshu, Japan in the spring of 1996 (Nakamura & Kubota 1998) found that survival of varied tits Parus varius was significantly higher at a 67 ha site supplied with supplementary food, compared to a 46 ha control (unfed) site 3 km away (100% survival over the 51 day study period for 17 tits in the fed area vs. 70% survival for 20 tits from the control area). Many birds changed breeding partners in the control site, whereas pair bonds were maintained in the fed site. Food consisted of 500 g sunflower seeds provided two or three times a week from seven feeders, each at least 150 m from each other. Feeders were visited on average 30 times/hr by three individuals.