“…For dome shaped cases the potential zoogeomorphic implications are less clear. Whilst empty cases of A. fuscipes were not more easily transported than constituent grains, A. fuscipes actively seek out areas of high shear stress as a flow of water through the case is required for respiration (Becker, 2005; Morris & Hondzo, 2013; Morris et al., 2015) and if they abandon their cases there, they may be easily mobilised. In contrast, if cases are attached to surface grains, cases of all species (but particularly A. fuscipes , which are not restricted to pupation to attach their cases; Olden et al., 2004) are likely to require much greater bed shear stress to transport.…”