Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Export of macroinvertebrate prey from tidal freshwater wetlands provides a significant energy subsidy for outmigrating juvenile salmon

Journal Article · · PLoS ONE
 [1];  [2]
  1. National Oceanic and Atmospheric Administration (NOAA), Hammond, OR (United States). Point Adams Research Station
  2. Pacific Northwest National Laboratory (PNNL), Portland, OR (United States). Coastal Sciences Division

Tidal freshwater wetlands linking terrestrial, riverine, and saline habitats are critical areas for material processing and exchange. Once historically widespread, herbaceous marsh and forested tidal freshwater wetlands especially are now highly degraded worldwide. Additionally, quantitative assessments of hydrology and material exchange from these systems are lacking compared to lotic and estuarine (saltmarsh) habitats. Here we investigate macroinvertebrate and energy export from tidal marsh and forested wetlands and consider potential benefits from this ecological process to endangered Pacific salmon in a large tidal freshwater system, the Columbia River (USA). Macroinvertebrate (salmon prey) concentration, water velocity, and discharge were measured at several wetland habitat types (forested swamp, emergent marsh, and restored marsh). We used these data to compute prey flux and transport metrics. Then, applying literature values to calculate prey energy equivalents and juvenile salmon metabolic requirements, we estimated the potential energy subsidy available to juvenile salmon. Numerically, larval stages of aquatic insects were the predominant type of prey exported from the wetlands, with Diptera chironomid fly abundance exceeding other groups. Energetically, however, non-chironomid dipterans and hemipteran prey comprised most of energy transport due to their higher energetic content (energy density × mean weight). We determined the prey energy transported from the sampled tidal channels was sufficient to meet energetic needs of tens to thousands of juvenile salmon per day, depending on prey production and hydrography. The prey taxonomic composition differed among organisms exiting forested swamp, emergent marsh, and restored marsh habitats with corresponding differences in energy transport, but all habitat types supported similar numbers of juvenile salmon. We conclude that macroinvertebrate prey exported from varied tidal freshwater wetlands likely provide significant benefits to juvenile salmon over a larger ecological footprint than the wetland area would suggest.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
2471578
Journal Information:
PLoS ONE, Journal Name: PLoS ONE Journal Issue: 3 Vol. 18; ISSN 1932-6203
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English

References (68)

Storm-driven particulate organic matter flux connects a tidal tributary floodplain wetland, mainstem river, and estuary journal July 2018
Evidence‐based evaluation of the cumulative effects of ecosystem restoration journal March 2016
Ecohydrology of wetland plant communities along an estuarine to tidal river gradient journal September 2020
Inferring tidal wetland stability from channel sediment fluxes: Observations and a conceptual model journal October 2013
Comparison of experimental and computational methods for discharge measurements from tidal wetlands journal September 2020
Effects of Extreme Hydrologic Regimes on Juvenile Chinook Salmon Prey Resources and Diet Composition in a Large River Floodplain journal February 2018
Seasonal Variation, Export Dynamics and Consumption of Freshwater Invertebrates in an Estuarine Environment journal March 1998
Hydrodynamic Control of the Supply of Suspended Chlorophyllato Infaunal Estuarine Bivalves journal September 1998
Between Coastal Marshes and Coastal Waters — A Review of Twenty Years of Speculation and Research on the Role of Salt Marshes in Estuarine Productivity and Water Chemistry book January 1980
Size-dependent drift responses of mayflies to experimental hydrologic variation: active predator avoidance or passive hydrodynamic displacement? journal December 1991
Effects of trout on the diel periodicity of drifting in baetid mayflies journal June 1994
Estuarine influence on survival rates of coho (Oncorhynchus kisutch) and chinook salmon (Oncorhynchus tshawytscha) released from hatcheries on the U.S. Pacific coast journal August 2003
Movements and food habits of striped bass ( Morone saxatilis ) in Delaware Bay (USA) salt marshes: comparison of a restored and a reference marsh journal December 2000
Movement patterns and feeding behavior of juvenile salmon (Oncorhynchus spp.) along armored and unarmored estuarine shorelines journal January 2015
Habitat change in the lower Columbia River estuary, 1870–2009 journal June 2017
Estuarine Habitat and Demographic Factors Affect Juvenile Chinook (Oncorhynchus tshawytscha) Growth Variability in a Large Freshwater Tidal Estuary journal June 2015
Diel Behaviors of Zooplankton Interact with Tidal Patterns to Drive Spatial Subsidies in the Northern San Francisco Estuary journal February 2022
Effect of frequency of feeding on nitrogen and energy balance in rainbow trout under maintenance conditions journal October 1988
Nutrient partitioning in rainbow trout at different feeding rates journal August 1991
Energy requirements, utilization and dietary supply to salmonids journal July 1994
A geohydrologic continuum theory for the spatial and temporal evolution of marsh-estuarine ecosystems journal December 1992
Species composition, distribution, and invertebrate prey of fish assemblages in the Columbia River Estuary journal January 1990
Between estuaries and the sea journal November 1996
The tidal exchange of Callianassa californiensis (Crustacea, Decapoda) larvae between the ocean and the Salmon River estuary, Oregon journal May 1982
Ecological assessment criteria for restoring anadromous salmonid habitat in Pacific Northwest estuaries journal July 2000
Temporal variability of hydrodynamics, sediment concentration and sediment settling velocity in a tidal creek journal October 2004
Restoration ecology: Ecological fidelity, restoration metrics, and a systems perspective journal April 2014
A spatially based area–time inundation index model developed to assess habitat opportunity in tidal–fluvial wetlands and restoration sites journal September 2015
Indexing habitat opportunity for juvenile anadromous fishes in tidal-fluvial wetland systems journal May 2021
Marshes as sources or sinks of an estuarine mysid: demographic patterns and tidal flux of Neomysis kadiakensis at China Camp marsh, San Francisco estuary journal April 2005
Hydrodynamic modelling of tidal-fluvial flows in a large river estuary journal November 2018
An expert panel process to evaluate habitat restoration actions in the Columbia River estuary journal March 2017
Density of red alder (Alnus rubra) in headwaters influences invertebrate and detritus subsidies to downstream fish habitats in Alaska journal June 2004
Impacts of Columbia River discharge on salmonid habitat: 2. Changes in shallow-water habitat journal January 2003
The Role of the Upper Tidal Estuary in Wetland Blue Carbon Storage and Flux journal May 2018
Floodplain Wetland Channel Planform, Cross‐Sectional Morphology, and Sediment Characteristics Along an Estuarine to Tidal River Gradient journal May 2021
A Comprehensive Estuarine Dissolved Organic Carbon Budget Using an Enhanced Biogeochemical Model journal May 2020
Export of invertebrates and detritus from fishless headwater streams in southeastern Alaska: implications for downstream salmonid production journal May 2002
Quantifying macrodetritus fluxes from a small temperate estuary journal January 2017
Reciprocal subsidies: Dynamic interdependence between terrestrial and aquatic food webs journal January 2001
Density and Condition of Subyearling Chinook Salmon in the Lower Columbia River and Estuary in Relation to Water Temperature and Genetic Stock of Origin journal July 2014
Foraging and Growth Potential of Juvenile Chinook Salmon after Tidal Restoration of a Large River Delta journal September 2014
Tidal exchange of larvae ofSesarma catenata(Decapoda, Brachyura) in the Swartkops estuary, South Africa journal January 1993
Comparative Use of Shallow and Deepwater Habitats by Juvenile Pacific Salmon in the Columbia River Estuary Prior to Ocean Entry journal January 2016
Transport of molluscan larvae through a shallow estuary journal September 2000
Distribution and feeding of juvenile Pacific salmon in freshwater tidal creeks of the lower Fraser River, British Columbia journal December 1995
Determination of the energy requirements of fish with particular reference to salmonids journal December 1995
Ecological Linkages Between Headwaters and Downstream Ecosystems: Transport of Organic Matter, Invertebrates, and Wood Down Headwater Channels1: Ecological Linkages Between Headwaters and Downstream Ecosystems journal January 2007
Metabolic rate in fishes: definitions, methods and significance for conservation physiology journal January 2016
Estimation of salmonid habitat growth potential through measurements of invertebrate food abundance and temperature journal August 2014
Causes and consequences of invertebrate drift in running waters: from individuals to populations and trophic fluxes journal August 2016
Hot eats and cool creeks: juvenile Pacific salmonids use mainstem prey while in thermal refuges journal October 2017
Floodplain rearing of juvenile chinook salmon: evidence of enhanced growth and survival journal February 2001
Influence of streamside vegetation on inputs of terrestrial invertebrates to salmonid food webs journal March 2003
Scope for Metabolism and Growth of Sockeye Salmon, Oncorhynchus nerka, and Some Related Energetics journal February 1976
Invertebrate drift and longitudinal transport processes in streams journal March 1996
Terrestrial invertebrates as salmonid prey and nitrogen sources in streams: contrasting old-growth and young-growth riparian forests in southeastern Alaska, U.S.A. journal June 1997
WETLAND RESOURCES: Status, Trends, Ecosystem Services, and Restorability journal November 2005
Fluxes of water, sediments, and biogeochemical compounds in salt marshes journal February 2013
Insights into estuary habitat loss in the western United States using a new method for mapping maximum extent of tidal wetlands journal August 2019
Zooplankton Dynamics in the Cache Slough Complex of the Upper San Francisco Estuary journal October 2018
Linking Ecosystems, Food Webs, and Fish Production: Subsidies in Salmonid Watersheds journal August 2010
Juvenile Salmonid Use of Reconnected Tidal Freshwater Wetlands in Grays River, Lower Columbia River Basin journal July 2010
The Network Dynamics Hypothesis: How Channel Networks Structure Riverine Habitats journal January 2004
Mechanistic effects of low-flow hydrology on riverine ecosystems: ecological principles and consequences of alteration journal December 2012
The Ecological Role of Zooplankton in a Long Island Salt Marsh journal June 1978
Foraging and Growth Potential of Juvenile Chinook Salmon after Tidal Restoration of a Large River Delta collection January 2015
How effective are created or restored freshwater wetlands for nitrogen and phosphorus removal? A systematic review collection January 2016