Examine these papers for their experimental designs

1. Peterson & Stevenson (1992). Resistance and Resilience of Lotic Algal Communities: Importance of Disturbance Timing and Current. Ecology 73(4): 1445-1461.
2. Vekovischeva et al. (2007) Multimetric statistical analysis of behavior in mice selected for high and low levels of isolation-induced male aggression. Behavioural Processes 75: 23–32