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    Newly settled marine invertebrates, such as polychaetes and bivalves, avoid recently disturbed sediments. This rejection of altered sediment surfaces is crucial for survival, preventing erosion and mortality in marine infauna.

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    Area of Science:

    • Marine Ecology
    • Infauna Biology
    • Sediment Dynamics

    Background:

    • High post-settlement mortality in marine infauna is often linked to sediment surface disturbances.
    • Processes like sediment removal, burial, or mixing alter the original sediment surface.

    Purpose of the Study:

    • To investigate the ability of newly settled infauna to discriminate between undisturbed and disturbed marine sediment surfaces.
    • To determine if juvenile infauna reject or delay burrowing into recently disturbed sediments.

    Main Methods:

    • Experiments exposed juvenile polychaetes (Nereis vexillosa, Arenicola cristata) and bivalves (Mercenaria mercenaria) to simulated disturbances.
    • Disturbances included erosional/mixing events, feces, burrow tailings, and feeding tracks.
    • Burrowing initiation time and success rate were measured on disturbed versus undisturbed surfaces.

    Main Results:

    • Juvenile infauna showed significantly increased burrowing times and reduced burrowing success on disturbed sediment surfaces compared to undisturbed ones.
    • Rejection or delayed burrowing was observed when disturbances were less than several hours old.
    • Non-burrowing individuals were rapidly eroded by water flow, while burrowing individuals remained stable.

    Conclusions:

    • Newly settled infauna actively reject or delay burrowing into recently disturbed sediment surfaces, utilizing cues from the disturbance process itself.
    • This discrimination is vital for survival, as non-burrowing individuals are susceptible to erosion.
    • The findings highlight the importance of sediment surface integrity for successful infauna settlement and survival.