Complex Tidal Marsh Dynamics Structure Fish Foraging Patterns In The San Francisco Estuary
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Complex Tidal Marsh Dynamics Structure Fish Foraging Patterns In The San Francisco Estuary

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Details:

  • Journal Title:
    Estuaries and Coasts
  • Personal Author:
  • NOAA Program & Office:
  • Sea Grant Program:
    CASG/CUIMR (California Sea Grant)
  • Description:
    Mechanisms driving the consumption and transport of tidal marsh nutrients and energy by fishes are of key interest in the San

    Francisco Estuary, CA, USA. By combining multiple data sources (gill-net catches, gut contents, channel morphology, tides), we

    modeled spatial and temporal patterns of fish abundance and gut fullness across a tidal marsh elevation gradient. Channel depth,

    microhabitat, and tide were important predictors of fish abundance and gut fullness. Species, feeding guild, and season were also

    important to fish abundance but not to gut fullness, suggesting that abundance was more related to physical constraints of shallow

    water than to prey availability. Multiple feeding guilds overlapped in space and time at interaction hotspots in subtidal channel

    habitat near the marsh entrance. In contrast, fish use of shallow intertidal marsh channels was more variable and indicated

    tradeoffs between foraging and predation. Gut content analysis revealed moderate-to-high gut fullness for all feeding guilds

    and models predicted high gut fullness in subtidal reaches during tidal flooding, after which fish fed intensively throughout the

    marsh. While mysids, amphipods, and detritus were common prey among feeding guilds, variation in prey consumption was

    apparent. Overall, complex tidal marsh hydrogeomorphology driving land-water exchange and residence time may diversify and

    enhance benthic and pelagic food web pathways to fishes and invertebrates. Furthermore, these findings substantiate the notion

    that dynamic tidal marshes in this system can support robust secondary production, foraging by multiple feeding guilds, and

    trophic transfer by fishes to the estuarine mosaic.

  • Keywords:
  • Source:
    Estuaries and Coasts, 44:1604–1618
  • DOI:
  • Document Type:
    Journal Article
  • Place as Subject:
    San Francisco Bay Area (Calif.)
  • Rights Information:
    CC BY
  • Compliance:
    Submitted
  • Main Document Checksum:
  • Download URL:
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