Whinchat Saxicola rubetra reproductive success according to hay cutting schedule and meadow passerine density in alluvial and upland meadows in France

摘要: Summary In France, whinchat Saxicola rubetra populations now rarely breed at altitudes below 1,000 m except in flooded alluvial plains. Whinchat reproductive success, the timing of haymaking and meadow bird density were assessed 2003 six areas selected three different plains, five from two massifs ranging 990 to 1,250 m, 2004 seven 1,200 2,000 m. The percentage territories which juveniles observed was negatively correlated with mown time when 80% hatched broods (observation prey carryings by adults) would theoretically be fledged. Additionally, hatching success early passerine territory 2004. upland meadows, exhibited either low (⩽1,200 m) or high (⩾1,200 m). lowland however, could match population then acts as a sink population. We conclude that adequate agri-environmental policy should not focus only on even if highest diversity is often found there.