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Current conditions and colonization history asymmetrically shape the organization of shallow sessile communities after simulated state shifts.
Marine Environmental Research 2018 Februrary
Historical processes affecting biological organization are rarely considered when predicting the effects of disturbance on community structure. In order to assess the relative importance of historical and post-disturbance conditions as determinants of community structure, we undertook reciprocal transplants, at different successional stages, of sessile communities developing at recreational piers that were previously observed to show contrasting fish predation pressure and settlement rate in the São Sebastião Channel, Brazil. Regardless the direction of state shift, after 15 weeks communities converged to the destination site structure, substantially drifting away from the path observed at origin, therefore revealing high susceptibility to environmental change. Although converging, transplanted communities never matched the destination standard in both transplant directions, suggesting that history still mattered, as providing some legacy that lasted, at least, for 15 weeks. The taxonomic groups resisting community drift were hard-bodied invertebrates, which could eventually provide some resilience to these communities through ecosystem engineering.
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