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Title: Isolating causal pathways between flow and fish in the regulated river hierarchy

Journal Article · · Canadian Journal of Fisheries and Aquatic Sciences
 [1];  [2];  [2];  [2];  [3];
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
  3. Tennessee Valley Authority, Knoxville, TN (United States)
+ Show Author Affiliations

Unregulated river systems are organized in a hierarchy in which large-scale factors (i.e., landscape and segment scales) influence local habitats (i.e., reach, meso-, and microhabitat scales), and both differentially exert selective pressures on biota. Dams, however, create discontinua in these processes and change the hierarchical structure. We examined the relative roles of hydrology and other instream factors, within a hierarchical landscape context, in organizing fish communities in regulated and unregulated tributaries to the Upper Tennessee River, USA. We also used multivariate regression trees to identify factors that partition fish assemblages based on trait similarities, irrespective of spatial scale. Then, we used classical path analysis and structural equation modeling to evaluate the most plausible hierarchical causal structure of specific trait-based community components, given the data. Both statistical approaches suggested that river regulation affects stream fishes through a variety of reach-scale variables, not always through hydrology itself. Though we observed different changes in flow, temperature, and biotic responses according to regulation types, the most predominant path in which dam regulation affected biota was via temperature alterations. Diversion dams had the strongest effects on fish assemblages. Diversion dams reduced flow magnitudes, leading to declines in fish richness but increased temperatures, leading to lower abundances in equilibrium species and nest guarders. Peaking and run-of-river dams increased flow variability, leading to lower abundances in nest-guarding fishes. Flow displayed direct relationships with biotic responses; however, results indicated that changes in temperature and substrate had equal, if not stronger, effects on fish assemblage composition. The strength and nature of relationships depended on whether flow metrics were standardized for river size. Here, we suggest that restoration efforts in regulated rivers focus on improving flow conditions in conjunction with temperature and substrate restoration.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1265850
Journal Information:
Canadian Journal of Fisheries and Aquatic Sciences, Vol. 72, Issue 11; ISSN 0706-652X
Publisher:
NRC Research PressCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 23 works
Citation information provided by
Web of Science

References (82)

The thermal regime of rivers: a review journal August 2006
Fragmentation alters stream fish community structure in dendritic ecological networks journal December 2012
Influence of Small Impoundments on Habitat and Fish Communities in Headwater Streams journal March 2009
On the specification of structural equation models for ecological systems journal February 2010
Impoundments and the Decline of Freshwater Mussels: a Case Study of an Extinction Gradient journal August 1999
Fish assemblages respond to altered flow regimes via ecological filtering of life history strategies journal October 2012
The role of impoundments in the sediment budget of the conterminous United States journal October 2005
Application of the ELOHA Framework to Regulated Rivers in the Upper Tennessee River Basin: A Case Study journal April 2013
lavaan : An R Package for Structural Equation Modeling journal January 2012
Does mobility explain variation in colonisation and population recovery among stream fishes? journal July 2009
Thermal habitat assessment of alternative flow scenarios in a tailwater fishery journal January 2005
Fish Traits: A Database of Ecological and Life-history Traits of Freshwater Fishes of the United States journal October 2009
Application of a hierarchical framework for assessing environmental impacts of dam operation: Changes in streamflow, bed mobility and recruitment of riparian trees in a western North American river journal July 2009
Wood placement in river restoration: fact, fiction, and future direction journal March 2015
What controls who is where in freshwater fish communities – the roles of biotic, abiotic, and spatial factors journal January 2001
A method for objectively identifying pool, run, and riffle habitats from physical measurements journal June 1993
A new method for non-parametric multivariate analysis of variance journal February 2001
Homogenization of regional river dynamics by dams and global biodiversity implications journal March 2007
Life history strategies, population regulation, and implications for fisheries management journal April 2005
Geomorphology and fish assemblages in a Piedmont river basin, U.S.A.: Geomorphology and stream fishes journal October 2003
Modifying dam Operations to Restore Rivers: Ecological Responses to Tennessee River dam Mitigation journal June 2005
Understanding natural patterns and processes in river corridors as the basis for effective river restoration journal July 2001
A new method for non-parametric multivariate analysis of variance: NON-PARAMETRIC MANOVA FOR ECOLOGY journal February 2001
River hydrological seasonality influences life history strategies of tropical riverine fishes journal March 2008
Ecological Benefits of Reduced Hydrologic Connectivity in Intensively Developed Landscapes journal January 2010
Fish community changes after minimum flow increase: testing quantitative predictions in the Rhone River at Pierre-Benite, France journal September 2006
ECOLOGY: Synthesizing U.S. River Restoration Efforts journal April 2005
Attributes of an alluvial river and their relation to water policy and management journal October 2000
Functional diversity supports the physiological tolerance hypothesis for plant species richness along climatic gradients journal January 2014
Altered stream-flow regimes and invasive plant species: the Tamarix case journal May 2007
Patterns of Movement and Habitat Use by Northern Hog Suckers in an Ozark Stream journal November 1995
What controls who is where in freshwater fish communities – the roles of biotic, abiotic, and spatial factors
  • Jackson, Donald A.; Peres-Neto, Pedro R.; Olden, Julian D.
  • Canadian Journal of Fisheries and Aquatic Sciences, Vol. 58, Issue 1 https://doi.org/10.1139/f00-239
journal January 2001
Influence of dams and habitat condition on the distribution of redhorse (Moxostoma) species in the Grand River watershed, Ontario journal December 2006
The Natural Flow Regime journal December 1997
Effects of elevated water temperature on fish and macroinvertebrate communities below small dams journal January 2003
Cavity Excavation and Enlargement as Mechanisms for Indirect Interactions in an Avian Community journal February 2008
Ecological responses to altered flow regimes: a literature review to inform the science and management of environmental flows: Review of altered flow regimes journal January 2010
PROFILE: Hungry Water: Effects of Dams and Gravel Mining on River Channels journal July 1997
Effects of Streamflow Diversion on a Fish Population: Combining Empirical Data and Individual-Based Models in a Site-Specific Evaluation journal February 2014
Gravel Addition as a Habitat Restoration Technique for Tailwaters journal October 2010
Alteration of streamflow magnitudes and potential ecological consequences: a multiregional assessment journal October 2010
A hydrogeography of unregulated streams in the United States and an examination of scale‐dependence in some hydrological descriptors journal August 1996
Ecological consequences of hydropower development in Central America: impacts of small dams and water diversion on neotropical stream fish assemblages journal January 2006
Threats, conservation strategies, and prognosis for suckers (Catostomidae) in North America: insights from regional case studies of a diverse family of non-game fishes journal February 2005
The Relationship of Spawning Mode to Conservation of North American Minnows (Cyprinidae) journal June 1999
Patterns of Life-History Diversification in North American Fishes: implications for Population Regulation journal October 1992
A Multi-Scaled Approach to Evaluating the Fish Assemblage Structure Within Southern Appalachian Streams journal July 2014
Movement Responses of Stream Fishes to Introduced Corridors of Complex Cover journal July 2007
Reproductive Guilds of Fishes: A Proposal and Definition journal June 1975
A framework for hydrologic classification with a review of methodologies and applications in ecohydrology: A FRAMEWORK FOR HYDROLOGIC CLASSIFICATION journal August 2011
Nesting habitat use by river chubs in a hydrologically variable Appalachian tailwater journal July 2013
Understanding natural patterns and processes in river corridors as the basis for effective river restoration journal January 2001
Ecological considerations in the development and application of instream flow-habitat models journal April 1987
A Riffle Stability Index to Evaluate Sediment Loading to Streams journal August 2002
The effects of river barriers and range expansion of the population genetic structure and stability in Greenside Darter (Etheostoma blennioides) populations journal June 2008
Recent habitat association and the historical decline of Notropis simus pecosensis journal July 2008
Hydraulic Food-Chain Models journal March 1995
A General Approach to Predicting Ecological Responses to Environmental Flows: Making Best Use of the Literature, Expert Knowledge, and Monitoring Data: PREDICTING ECOLOGICAL RESPONSES TO ENVIRONMENTAL FLOWS journal August 2014
Alternatives To Statistical Hypothesis Testing In Ecology: A Guide To Self Teaching journal February 2006
Hydrologic filtering of fish life history strategies across the United States: implications for stream flow alteration journal January 2015
An Objective and Parsimonious Approach for Classifying Natural flow Regimes at a Continental Scale: Classification of Natural flow Regimes journal September 2013
Revisiting the homogenization of dammed rivers in the southeastern US journal March 2012
Incorporating thermal regimes into environmental flows assessments: modifying dam operations to restore freshwater ecosystem integrity: Incorporating thermal regimes in environmental flows assessments journal January 2010
Classification of natural flow regimes in Australia to support environmental flow management: Classification of natural flow regimes in Australia journal January 2010
How do dams affect freshwater fish distributions in Japan? Statistical analysis of native and nonnative species with various life histories journal October 2007
Stream Restoration Practices in the Southeastern United States journal September 2007
Inferring Multiple Causality: The Limitations of Path Analysis journal August 1996
Life history theory predicts fish assemblage response to hydrologic regimes journal January 2012
Multivariate Regression Trees: A New Technique for Modeling Species-Environment Relationships journal April 2002
Long-Term Changes in Regional Hydrologic Regime Following Impoundment in a Humid-Climate Watershed journal December 2001
Downstream fish assemblage response to river impoundment varies with degree of hydrologic alteration journal February 2014
Natural flow regime, temperature and the composition and richness of invertebrate assemblages in streams of the western United States: Macroinvertebrates and stream flow regimes journal February 2011
Movements of mottled sculpins (Cottus bairdii) in a Michigan stream: how restricted are they?
  • Breen, Matthew J.; Ruetz, Carl R.; Thompson, Kurt J.
  • Canadian Journal of Fisheries and Aquatic Sciences, Vol. 66, Issue 1 https://doi.org/10.1139/F08-189
journal January 2009
Review of Ecological Effects of Rapidly Varying Flows Downstream from Hydroelectric Facilities journal July 1985
Landscapes to Riverscapes: Bridging the Gap between Research and Conservation of Stream Fishes journal January 2002
A hierarchical framework for stream habitat classification: Viewing streams in a watershed context journal March 1986
Factors Affecting Nesting Success of Smallmouth Bass in a Regulated Virginia Stream journal September 1995
Responses of Native and Nonnative Fishes to Natural Flow Regime Mimicry in the San Juan River journal July 2004
Global Review of the Physical and Biological Effectiveness of Stream Habitat Rehabilitation Techniques journal June 2008
Recovery of a Warmwater Fish Assemblage after the Initiation of a Minimum-Flow Release Downstream from a Hydroelectric Dam journal November 1995
Going with the Flow: Using Species–Discharge Relationships to Forecast Losses in fish Biodiversity journal August 2006
A new method for non-parametric multivariate analysis of variance journal February 2001

Cited By (4)

Catchment-scale determinants of nonindigenous minnow richness in the eastern United States journal January 2017
Organizing Environmental Flow Frameworks to Meet Hydropower Mitigation Needs journal June 2016
Flow‐mediated predator–prey dynamics influence fish populations in a tropical river journal May 2019
A regional analysis of the impact of dams on water temperature in medium-size rivers in eastern Canada journal December 2016

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Related Subjects

58 GEOSCIENCES
fish
dam
hydrology
hydropower
stream ecology
landscape ecology