1. You can do this as if you were riffle-shuffling a pack of cards (but much slower!).

Fais comme si tu battais un paquet de cartes (mais beaucoup plus lentement !).

2. D. dubia ate relatively more animals associated with riffle habitats; E. punctata ate relatively more pool-dwelling organisms.

D. dubia consomme relativement plus de proies associées aux eaux rapides, alors qu'E. punctata consomme relativement plus d'organismes d'eaux calmes.