Effect of deposit feeders on migration of137Cs in lake sediments
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2022, Marine Pollution BulletinCitation Excerpt :It is important to remember that the dynamics of sediment mixing during bioturbation is species dependent, as it will vary in intensity, depth of penetration, and can substantially alter the vertical profiles of sediment constituents from those that would otherwise exist. For example, worms ingest sediments from the surface and excrete them in deeper zones (Robbins et al., 1979), and for these group of species, the displacement and accumulation of MPs in the lower layers of the sedimentary column can result in a variation in environmental conditions, such as MPs preservation. In contrast, while digging their burrows, fiddler crabs move sediment parcels at depth to the surface (bottom-to-top effect), where they may wash away during high tides (Wang et al., 2010) and inadvertently lower the overall MPs concentration in the sedimentary column.
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2019, Estuarine, Coastal and Shelf ScienceCitation Excerpt :The contributions of species to sediment mixing and irrigation are variable, and depend on population demography (Gerino et al., 2003), i.e. size, density of life stages (Matisoff, 1982; Sandnes et al., 2000) and biomass (Nizzoli et al., 2002; Solan et al., 2004a), and on species-specific traits such as feeding behaviour and mode of movement (Aller, 2001). In general, three modes of sediment particle mixing have been observed in research performed with monospecific populations: biodiffusion (Goldberg and Koide, 1962), bio-advection (Fisher et al., 1980; Rice, 1986; Robbins et al., 1979) and regeneration (Benninger et al., 1979; Gardner et al., 1987; Sharma et al., 1987). Omnidirectional particle transport over short distances by macrobenthos is referred to as biodiffusion (Cochran, 1985; Guinasso and Schink, 1975; Wheatcroft et al., 1990).