EPSCoR - Alaska Adapting to Changing Environments

EPSCoR - Alaska Adapting to Changing Environments

Other agencies

Spatial and temporal variation in nearshore macrofaunal community structure in a seasonally hypoxic estuary

Low dissolved oxygen (DO), or hypoxia, has emerged as a key threat to marine and estuarine ecosystems worldwide. While deep, offshore severe hypoxia (<2 mg l−1) can cause mortality, the non-lethal impact of lower DO on the shallow nearshore (≤30 m) community is not well understood, despite the importance of the habitat for numerous species. We evaluated the sublethal influence of hypoxia on the nearshore, subtidal community of Hood Canal, Washington, USA, a seasonally hypoxic estuary. We compared 2 regions (southern impacted and northern reference) by using underwater monitoring to record weekly videos of benthic mobile species at transects at 3 depths (10, 20, and 30 m). We found the community composition was significantly different between the 2 regions; the south was primarily composed of hypoxia-tolerant invertebrates and fewer fish species compared to the northern site. Relative to other predictors, DO performed moderately well in describing the occurrence of the most abundant species. Additionally, tolerant species displayed almost a 3-fold increase in presence below a mean (±SE) DO tolerance threshold of 3.77 ± 0.27 mg l−1, while more sensitive species declined. The magnitude in change towards more tolerant species was also greater in the south. Ultimately, comparing our findings to long-term DO trends in Hood Canal revealed the potential for a more persistent low DO state in the southern reaches. This study provides insight into the complex regional differences in community structure and potential sensitivity of nearshore communities to other perturbations in estuarine systems.

Data and Resources

  • View website
    Website :: Publisher Website

    http://www.int-res.com/abstracts/meps/v520/p67-83/

Status: Complete
Type: Project
Data Types: Report
Primary Contact
Pyare, Sanjay
Email: sanjay.pyare@uas.alaska.edu
Work: 907-796-6007
Primary Agency
EPSCoR - Alaska Adapting to Changing Environments
Type
Academic

Funding Agency
EPSCoR - Alaska Adapting to Changing Environments
Type
Academic

Other Agencies
National Science Foundation

ISO Topics
biota

Geo-keywords
Southeast

Collection
Southeast Test Case

Direct Record Link
http://setc.portal.gina.alaska.edu/catalogs/11699-spatial-and-temporal-variation-in-nearshore-mac
  • 01c8ceef3d596f40f05bf496ca00d929
    Updated by Lisa
    2017-02-22 13:18:36 -0900
  • 01c8ceef3d596f40f05bf496ca00d929
    Published by Lisa
    2016-09-12 15:09:26 -0800
  • 01c8ceef3d596f40f05bf496ca00d929
    Updated by Lisa
    2016-09-12 15:09:06 -0800
  • 470f70ddabc3d336a04110c5468ab053
    New record created
    2016-09-09 13:37:59 -0800
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