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DISCUSSIONCrab burrowing is one of the most common bioturbations in salt marsh ecosystems and thus, understanding the movements of soil and associated C and N by crabs and their effects on soil properties is essential to understand how the biotic factors influence material cycling and energy flow. In this study, we considered the roles of bioturbation by a crab assemblage rather than a single dominant crab species in the salt marshes. In such coastal salt marsh ecosystems, crab burrowing does not work alone, but it interacts with tidal flow, which promotes vertical and horizontal transport of sediments and associated carbon and nitrogen. The interactive effects of crab burrowing and tidal flow on soil properties can be conceptualized by Figure 7, based on which our results are discussed below.
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