Experiment I | ||||
---|---|---|---|---|
Number of replicates | Number of crayfish | |||
0 | 1 | 2 | 4 | |
w/ macrophytes | 2 | 4 | 4 | 4 |
w/o macrophytes | – | 2 | 2 | 2 |
Duration | 91Â days | |||
Dragonfly larvae | Introducing 34 individuals at the beginning and counting survivors on the 21th day | |||
Chironomid larvae | Introducing 30 individuals at the beginning and once a week and counting survivors at the end |
Experiment II | |||
---|---|---|---|
Number of replicates | Artificial macrophyte density | ||
No | Medium | High | |
w/ crayfish and dragonflies | 4 | 4 | 4 |
w/o crayfish w/ dragonflies | 4 | – | – |
w/ crayfish w/o dragonflies | 4 | – | – |
Duration | 28Â days | ||
Dragonfly larvae | Introducing 50 individuals at first and then 20 individuals once a week and counting survivors twice a week | ||
Chironomid larvae | Introducing 30 individuals at the beginning and once a week and counting survivors at the end |