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Food Web Fuel Differs Across Habitats And Seasons Of A Tidal Freshwater Estuary



Details

  • Journal Title:
    Estuaries and Coasts
  • Personal Author:
  • NOAA Program & Office:
  • Sea Grant Program:
    CASG/CUIMR (California Sea Grant)
  • Description:
    Estuarine food webs are fueled by multiple different primary producers. However, identifying the relative importance of each producer to consumers is difficult, particularly for fishes that utilize multiple food sources due to both their mobility and their generally high trophic levels. Previous studies have documented broad spatial differences in the importance of primary producers to fishes within the Upper San Francisco Estuary, California, including separation between pelagic and littoral food webs. In this study, we evaluated the importance of primary producers to adult fishes in three closely spaced subregions that represented disparate habitat types (a tidal wetland channel, a turbid backwater channel, and a deep open-water channel), each a potential outcome of local restoration projects. Using stable isotope analysis coupled with a Bayesian mixing model, we identified significant differences in primary-producer contribution to fishes and invertebrates across habitats and seasons, especially in the relative contribution of submersed aquatic vegetation and phytoplankton. Most fishes utilized multiple primary producers and showed little segregation between pelagic and littoral food webs among habitats. Availability of primary producers differs seasonally and across multiple spatial scales, helping to buffer environmental variability and thus enhancing food web resilience. Ecosystem restoration may improve with emphasis on restoring a wide variety of primary producers to support consumers.
  • Keywords:
  • Source:
    Estuaries and Coasts 44, 286–301 (2021)
  • DOI:
  • Sea Grant Document Number:
    CASG-R-20-017
  • Document Type:
    Journal Article
  • Funding:
    Grant no. NA14OAR4170075
  • Place as Subject:
    San Francisco Bay (Calif.)
  • Rights Information:
    CC BY
  • Compliance:
    Library
  • Main Document Checksum:
    urn:sha256:d3ca5344db8fec38863f8923e66fea00f20f26b378f0f2d8e04aad67f507c99e
  • Download URL:
  • File Type:
    Filetype[PDF - 2.34 MB ]
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