Randomized complete block caging experiments were used to determine
if H. sanguineus would have an impact on amphipod abundance
in the natural environment. Three experiments were done in Clark's
Cove in 2002: from 24 May–12 June, 4–23 July, and 16 August–4 September.
Experiments were conducted in the lower third of intertidal
zone; the average intertidal elevation was 27 cm above MLW, with experiments
conducted at higher elevation in August (34 cm) than May
(19 cm).