The effects of dams on longitudinal variation in river food webs

Growns, Ivor; Chessman, Bruce C.; Mitrovic, Simon M.; Westhorpe, Doug

doi:10.1080/02705060.2013.832423

Cited by 11 publications

(19 citation statements)

References 43 publications

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“…d 13 C of seston and phytomicrobenthos differed among locations; trees and herbaceous plants had relatively consistent d 13 C values across locations for a given season. d 13 C values of seston, phytomicrobenthos and trees varied among seasons, and were similar to values reported for these groups from other temperate rivers (Hladyz et al, 2012;Pingram et al, 2012;Growns et al, 2013). Mean d 13 C of phytomicrobenthos generally was lower at the downstream site and tributary 2, and higher in the reservoir relative to upstream sites.…”

Section: Isotopic Signatures Of Basal Sources and Omnivorous Fishessupporting

confidence: 79%

“…Several studies have reported similar impoundment effects on benthic algae d 13 C signatures (Chen & Jia, 2009;Chessmen et al, 2009;Smokorowski et al, 2011). Unlike other studies that have demonstrated 15 N enrichment of benthic algae downstream from dams (Chessmen et al, 2009;Growns et al, 2013), our investigation found little difference in phytomicrobenthos d 15 N and fairly consistent d 15 N values for Cladophora and C 3 herbaceous plants across the study area. This finding for phytomicrobenthos is surprising given that the composition of the riparian forests can influence d 15 N of inorganic nitrate in local stream water.…”

Section: Isotopic Signatures Of Basal Sources and Omnivorous Fishescontrasting

confidence: 73%

“…The water released from the hypolimnion may contain dissolved inorganic carbon that is relatively depleted in 13 C and inorganic nitrogen enriched in 15 N (Growns et al, 2013), and this could have contributed to the spatial variation observed in d 13 C of phytomicrobenthos at the downstream site. Several studies have reported similar impoundment effects on benthic algae d 13 C signatures (Chen & Jia, 2009;Chessmen et al, 2009;Smokorowski et al, 2011).…”

Section: Isotopic Signatures Of Basal Sources and Omnivorous Fishesmentioning

confidence: 97%

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Stable isotope analysis reveals relative influences of seasonal hydrologic variation and impoundment on assimilation of primary production sources by fish in the Upper Yesilırmak River, Turkey

et al. 2015

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This study analyzed variation in stable isotope ratios of aquatic and terrestrial primary producers and two common cyprinid fishes (Capoeta banarescui and Squalius cephalus) at seven sites in the upper Yeşilırmak River Basin, Turkey, to estimate relative contributions of basal production sources to fish biomass. We hypothesized that seasonal and spatial variation in fish assimilation of basal production sources would be affected by hydrological variation, with results for a reach downstream from a reservoir differing from those from upstream sites. Carbon and nitrogen isotopic ratios of primary producers and S. cephalus and d 15 N of C. banarescui revealed significant spatial variation. d 13 C of primary producers, d 15 N of S. cephalus, and both d 13 C and d 15 N of C. banarescui revealed significant seasonal variation. C. banarescui biomass in the river channel was mostly derived from terrestrial herbaceous plants, and its biomass in the reservoir derived mostly from aquatic plants. Estimated proportional contributions of herbaceous plants to both species were greatest at the downstream site during spring, and declined during summer in the case C. banarescui. Overall, the influence of the dam was small relative to effects from watershed characteristics and seasonal changes in temperature and hydrology.

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Section: Isotopic Signatures Of Basal Sources and Omnivorous Fishessupporting

confidence: 79%

Section: Isotopic Signatures Of Basal Sources and Omnivorous Fishescontrasting

confidence: 73%

Section: Isotopic Signatures Of Basal Sources and Omnivorous Fishesmentioning

confidence: 97%

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Stable isotope analysis reveals relative influences of seasonal hydrologic variation and impoundment on assimilation of primary production sources by fish in the Upper Yesilırmak River, Turkey

et al. 2015

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“…We observed gradual but distinct enrichment of δ 15 N (3–4‰) over time in lungfish scales from the Brisbane and Burnett Rivers, which are likely due to increasing water infrastructure development and agricultural land use intensification over time. Previous studies suggest that dams are net exporters of nitrogen and have demonstrated δ 15 N enrichment of benthic algae (Growns et al, ) and higher consumers downstream of dams (Beutel, ; Duda, Coe, Morley, & Kloehn, ). By contrast, δ 15 N of lungfish from the Mary River gradually increased during the period 1960–1980, followed by a marked decrease to present‐day.…”

Section: Discussionmentioning

confidence: 97%

“…Similarly, the increased hydrologic stability below dams can lead to excessive growth of autochthonous sources including macrophytes, periphyton, and phytoplankton (Pingram, Collier, Hamilton, David, & Hicks, ). Large impoundments are also a significant source of planktonic production, which ultimately provides food subsidies to downstream aquatic consumers (Doi et al, ; Growns, Chessman, Mitrovic, & Westhorpe, ).…”

Section: Introductionmentioning

confidence: 99%

Looking to the past to ensure the future of the world's oldest living vertebrate: Isotopic evidence for multi‐decadal shifts in trophic ecology of the Australian lungfish

Olden

Fallon

Roberts

et al. 2018

River Research & Apps

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Meeting the conservation challenges of long‐lived animal species necessitate long‐term assessments of trophic ecology. The use of dietary proxies, such as ratios of naturally occurring stable isotopes in animal tissues demonstrating progressive growth, has shown considerable promise to reconstruct trophic histories of long‐lived organisms experiencing environmental change. Here, we combine innovative radiocarbon scale‐ageing techniques with stable isotope analysis of carbon and nitrogen from cross sections of scale to reconstruct the trophic ecology of Australian lungfish (Neoceratodus forsteri) across its remaining global distribution. Over a 65‐year period, we found pronounced temporal shifts in the δ13C and δ15N isotopic ratios of lungfish that coincided with a period of hydrological modification by dams and land‐use intensification associated with agriculture and livestock grazing. In the Brisbane and Burnett Rivers, whose hydrology is substantially regulated by large dams, lungfish showed consistent trends of δ13C depletion and δ15N enrichment over time. This may indicate anthropogenic changes in background isotopic levels of basal energy sources and/or that additional seston exported downstream from impoundments represent a carbon source that was previously unavailable, thus shifting lungfish diet from benthic‐dominated primary production typical of unmodified river systems, to pelagic carbon sources. By contrast, δ13C ratios of lungfish in the unregulated Mary River were more stable through time, whereas δ15N ratios increased during a period of dairy industry expansion and increased application of nitrogen fertilization and then subsequently decreased at the same time that rates of pasture development declined and nutrient inputs presumably decreased. In conclusion, we provide evidence for human‐caused alterations in background isotopic levels and potential changes in availability of benthic versus pelagic energy resources supporting Australian lungfish and demonstrate how detectable trophic signals in long‐lived fish scales can reveal long‐term anthropogenic changes in riverine ecosystems.

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Identifying Potential Anglers and Customer Segments of Texas Catfish Anglers to Guide Management Actions

Schlechte

Taylor

Buckmeier

et al. 2021

N American J Fish Manag

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In this paper, we demonstrate how one can combine angler survey data with Environmental Systems Research Institute (ESRI) Tapestry data to assist in developing a statewide plan for catfish recruitment, retention, and reactivation (R3) and management. In 2010, Mississippi State University surveyed 1,078 Texas freshwater catfish anglers to examine their catch‐related attitudes and trip preferences by using a stated choice experiment. The study showed that the responding freshwater catfish anglers could be grouped into five clusters based on their catch‐related attitudes. We used ESRI’s Business Analyst extension to define the primary customer segments (also called “Tapestries”) within these five catch‐related clusters. We used principal components analysis followed by a similarity profile analysis to help us identify differences among the customer segments for the five catch‐related clusters. We found that the Rooted Rural Tapestry, located outside urban areas, was significantly more likely to be associated with catfish anglers whose answers suggested that they had higher trophy motivation compared to the other angler clusters. We also found that anglers in the urban areas were more likely to have a variety of motivations. The Southwestern Families Tapestry was identified as an underserved group exhibiting high growth potential and should be considered for targeted R3 efforts using insight gathered from that tapestry on its preferred media channels. We plotted areas with high populations and proportions of individual tapestries that were the greatest in discriminating among the catch‐related angler clusters. Our ESRI predictive maps for 2024 showed areas throughout Texas where managers could focus different R3 advertising and catfish management strategies based on the underlying customer segments.

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The effects of dams on longitudinal variation in river food webs

Cited by 11 publications

References 43 publications

Stable isotope analysis reveals relative influences of seasonal hydrologic variation and impoundment on assimilation of primary production sources by fish in the Upper Yesilırmak River, Turkey

Stable isotope analysis reveals relative influences of seasonal hydrologic variation and impoundment on assimilation of primary production sources by fish in the Upper Yesilırmak River, Turkey

Looking to the past to ensure the future of the world's oldest living vertebrate: Isotopic evidence for multi‐decadal shifts in trophic ecology of the Australian lungfish

Identifying Potential Anglers and Customer Segments of Texas Catfish Anglers to Guide Management Actions

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