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Diversity and dispersal interactively affect predictability of ecosystem function.

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    Biodiversity loss impacts ecosystem services, but dispersal processes complicate predictions. This study found that increased grazer diversity and dispersal altered production stability in seagrass ecosystems.

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    Area of Science:

    • Ecology
    • Environmental Science

    Background:

    • Biodiversity loss can reduce ecosystem services like production and nutrient cycling.
    • Dispersal processes are crucial for maintaining diversity but are often overlooked in biodiversity-ecosystem functioning research.
    • Anthropogenic impacts on biodiversity, such as habitat fragmentation, are mediated by dispersal, making ecosystem service responses to degradation uncertain.

    Discussion:

    • This study investigated the interactive effects of mobile grazer diversity and dispersal on seagrass metacommunities.
    • Experimental setups included isolated and connected patches with varying grazer diversity.
    • Mobile grazer movement and patch selection were analyzed in relation to ecosystem properties.

    Key Insights:

    • Contrary to predictions, increased mobile grazer species diversity amplified spatial and temporal variability in primary and secondary production.
    • Dispersal and patch selection by grazers diminished the impact of diversity on production.
    • The relationship between biodiversity and ecosystem stability varied significantly between patch and metacommunity scales.

    Outlook:

    • Declining biodiversity and habitat fragmentation interact, creating synergistic effects that reduce the predictability of ecosystem functioning.
    • Understanding these complex interactions is vital for predicting ecosystem service stability under environmental change.
    • Future research should integrate dispersal dynamics into biodiversity-ecosystem functioning studies.