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Title: Dispersal Limitations on Fish Community Recovery Following Long-term Water Quality Remediation

Abstract

Holistic restoration approaches, such as water quality remediation, are likely to meet conservation objectives because they are typically implemented at watershed scales, as opposed to individual stream reaches. However, habitat fragmentation may impose constraints on the ecological effectiveness of holistic restoration strategies by limiting colonization following remediation. We questioned the importance of dispersal limitations to fish community recovery following long-term water quality remediation and species reintroductions across the White Oak Creek (WOC) watershed near Oak Ridge, Tennessee (USA). Long-term (26 years) responses in fish species richness and biomass to water quality remediation were evaluated in light of habitat fragmentation and population isolation from instream barriers, which varied in their passage potential. In addition, ordination techniques were used to determine the relative importance of habitat connectivity and water quality, in explaining variation fish communities relative to environmental fluctuations, i.e. streamflow. Ecological recovery (changes in richness) at each site was negatively related to barrier index, a measure of community isolation by barriers relative to stream distance. Following species reintroductions, dispersal by fish species was consistently in the downstream direction and upstream passage above barriers was non-existent. The importance of barrier index in explaining variation in fish communities was stronger during higher flowmore » conditions, but decreased over time an indication of increasing community stability and loss of seasonal migrants. Compared to habitat fragmentation, existing water quality concerns (i.e., outfalls, point source discharges) were unrelated to ecological recovery, but explained relatively high variation in community dynamics. Our results suggest that habitat fragmentation limited the ecological effectiveness of intensive water quality remediation efforts and fish reintroduction efforts by impeding recolonization at isolated stream reaches.« less

Authors:
 [1];  [1];  [1];  [1];  [1];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1240522
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Hydrobiologia
Additional Journal Information:
Journal Name: Hydrobiologia; Journal ID: ISSN 0018-8158
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; restoration; stream barriers; habitat fragmentation

Citation Formats

McManamay, Ryan A., Jett, Robert T., Ryon, Michael G., Gregory, Scott M., Stratton, Sally H., and Peterson, Mark J. Dispersal Limitations on Fish Community Recovery Following Long-term Water Quality Remediation. United States: N. p., 2016. Web. doi:10.1007/s10750-015-2612-7.
McManamay, Ryan A., Jett, Robert T., Ryon, Michael G., Gregory, Scott M., Stratton, Sally H., & Peterson, Mark J. Dispersal Limitations on Fish Community Recovery Following Long-term Water Quality Remediation. United States. doi:10.1007/s10750-015-2612-7.
McManamay, Ryan A., Jett, Robert T., Ryon, Michael G., Gregory, Scott M., Stratton, Sally H., and Peterson, Mark J. Mon . "Dispersal Limitations on Fish Community Recovery Following Long-term Water Quality Remediation". United States. doi:10.1007/s10750-015-2612-7. https://www.osti.gov/servlets/purl/1240522.
@article{osti_1240522,
title = {Dispersal Limitations on Fish Community Recovery Following Long-term Water Quality Remediation},
author = {McManamay, Ryan A. and Jett, Robert T. and Ryon, Michael G. and Gregory, Scott M. and Stratton, Sally H. and Peterson, Mark J.},
abstractNote = {Holistic restoration approaches, such as water quality remediation, are likely to meet conservation objectives because they are typically implemented at watershed scales, as opposed to individual stream reaches. However, habitat fragmentation may impose constraints on the ecological effectiveness of holistic restoration strategies by limiting colonization following remediation. We questioned the importance of dispersal limitations to fish community recovery following long-term water quality remediation and species reintroductions across the White Oak Creek (WOC) watershed near Oak Ridge, Tennessee (USA). Long-term (26 years) responses in fish species richness and biomass to water quality remediation were evaluated in light of habitat fragmentation and population isolation from instream barriers, which varied in their passage potential. In addition, ordination techniques were used to determine the relative importance of habitat connectivity and water quality, in explaining variation fish communities relative to environmental fluctuations, i.e. streamflow. Ecological recovery (changes in richness) at each site was negatively related to barrier index, a measure of community isolation by barriers relative to stream distance. Following species reintroductions, dispersal by fish species was consistently in the downstream direction and upstream passage above barriers was non-existent. The importance of barrier index in explaining variation in fish communities was stronger during higher flow conditions, but decreased over time an indication of increasing community stability and loss of seasonal migrants. Compared to habitat fragmentation, existing water quality concerns (i.e., outfalls, point source discharges) were unrelated to ecological recovery, but explained relatively high variation in community dynamics. Our results suggest that habitat fragmentation limited the ecological effectiveness of intensive water quality remediation efforts and fish reintroduction efforts by impeding recolonization at isolated stream reaches.},
doi = {10.1007/s10750-015-2612-7},
journal = {Hydrobiologia},
number = ,
volume = ,
place = {United States},
year = {2016},
month = {2}
}

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