A small supply of high quality detritus stimulates the consumption of low quality materials, but creates subtle effects on the performance of the consumer
1 Laboratory or Stream Ecology, Dept. of Plant Biology and Ecology, University of the Basque Country, UPV/EHU, PO Box 644, 48080 Bilbao, Spain. Electronic address: aitor.larranagaa@ehu.eus.
2 Laboratory or Stream Ecology, Dept. of Plant Biology and Ecology, University of the Basque Country, UPV/EHU, PO Box 644, 48080 Bilbao, Spain.