Water-quality trends in the Rio Grande/Rio Bravo Basin using sediment cores from reservoirs

Metre, Peter C. Van; Mahler, Barbara J.; Callender, Edward

doi:10.3133/fs22196

Cited by 29 publications

(9 citation statements)

References 10 publications

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“…15). Mercury concentrations are increasing in the NAS inlet, which is consistent with regional increases in mercury observed in cores from other reservoirs (Van Metre, Mahler, and Callender, 1997) and lakes (Swain and others, 1992).…”

Section: Chromiumsupporting

confidence: 67%

Chemical quality of water, sediment, and fish in Mountain Creek Lake, Dallas, Texas, 1994-97

Metre¹,

Jones²,

Moring³

et al. 2003

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Section: Chromiumsupporting

confidence: 67%

Chemical quality of water, sediment, and fish in Mountain Creek Lake, Dallas, Texas, 1994-97

Metre¹,

Jones²,

Moring³

et al. 2003

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“…Therefore, macroinvertebrate samples were collected to estimate trophic position of study fish collected at all sites, seasonally. Macroinvertebrates were collected from fast-and slow-flowing habitats using a combination of Hess samples and dip-and [15]. Site abbreviations are consistent with abbreviations in Table 1.…”

Section: Fish and Invertebrate Collectionmentioning

confidence: 94%

“…where d 15 N Consumer is the d 15 N value for consumer for which trophic position is estimated, d 15 N Baseline is the d 15 N value of baseline organism, 2 is the expected trophic position of the organism used to estimate baseline d 15 N, and f is the d 15 N fractionation factor expected between a predator and its prey (3.4%, [26]). Trophic position of each consumer was determined by standardizing each site on each sampling date with a site-specific d 15 N baseline taxonomic group [26], which was established by determining the consumer that exhibits the lowest d 15 N values at that site on a specific date. In the present study, baseline organisms at each site were found to be invertebrates primarily consisting of the following invertebrate groups: Gastropoda, Naucoridae, Psephenidae, Leptophlebiidae, and Baetidae.…”

Section: Determination Of Fish Trophic Guild and Trophic Positionmentioning

confidence: 99%

“…In addition, previous studies have noted incongruence in trophic classification of riverine fish using literature-defined trophic guilds versus isotopically defined trophic levels; these differences are thought to be due to high levels of omnivory in stream fish [33] and differences in the relative importance of algal-versus terrestrialderived OM as food sources [34]. Indeed, riverine fish can rely greatly upon terrestrial OM sources, and complex 15 N fractionation processes and variability in d…”

Section: Spatial Variation In Hg In Fish and Sensitivity To Hg Loadingmentioning

confidence: 99%

“…Information on the degree of Hg contamination of Rio Grande food webs is limited. In some portions of the drainage, Hg concentrations in river sediments are relatively high (>50 mg/kg) and are temporally increasing [14,15]. In addition, several wildlife species associated with the river are contaminated with Hg [16].…”

Section: Introductionmentioning

confidence: 99%

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Mercury contamination of the fish community of a semi‐arid and arid river system: Spatial variation and the influence of environmental gradients

Smith

Abuzeineh

Chumchal

et al. 2010

Enviro Toxic and Chemistry

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Mercury (Hg) contamination of aquatic ecosystems is a global environmental problem. Data are abundant on Hg contamination and factors that affect its bioaccumulation in lake communities, but comparatively little information on riverine ecosystems exists. The present study examines fish Hg concentrations of the Lower Rio Grande/Rio Bravo del Norte drainage, Texas, USA and several of its major tributaries in order to assess whether spatial variation occurs in fish Hg concentrations in the drainage and if patterns of Hg contamination of fish are related to gradients in environmental factors thought to affect Hg concentrations in fish communities. Fish, invertebrates, sediments, and water quality parameters were sampled at 12 sites along the lower Rio Grande/Rio Bravo del Norte drainage multiple times over a one-year period. Spatial variation was significant in fish Hg concentrations when fish were grouped by literature-defined trophic guilds or as stable isotope-defined trophic levels, with highest concentrations found in the Big Bend region of the drainage. Mercury in fish in most trophic guilds and trophic levels were positively related to environmental factors thought to affect Hg in fish, including water column dissolved organic carbon (DOC) and sediment Hg concentrations. It is likely that fish Hg concentrations in the Big Bend region are relatively high because this section of the river has abundant geologic Hg sources and environmental conditions which may make it sensitive to Hg inputs (i.e., high DOC, variable water levels). Results from the present study indicate that Hg contamination of the Rio Grande/Rio Bravo del Norte has substantial implications for management and protection of native small-bodied obligate riverine fish, many of which are imperiled.

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Assessment of Organochlorine Pesticide Levels in Manadas Creek, an Urban Tributary of the Rio Grande in Laredo, Texas

Flores

Camarena

Ren

et al. 2008

Arch Environ Contam Toxicol

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The Rio Grande is the natural boundary between the United States and Mexico from El Paso, Texas, to Brownsville, Texas. It supports about 12 million people on both sides of the border for municipal, agricultural, industrial, and recreational uses. The rapid population and economic growth along the border region has led to increased pollution in the Rio Grande, which has been linked to several border health issues associated with pesticide contamination. This project was initiated to assess the organochlorine pesticide levels in the water and sediments in Manadas Creek, an urban tributary of the Rio Grande located in north Laredo, Texas. Water and sediment samples were collected monthly during a 6-month period from July to December of 2006 and analyzed using gas chromatography with an electron capture detector after extraction via a solid-phase microextraction technique. Among the water and sediment samples collected, several organochlorine pesticides including alpha-, beta-, and gamma-hexachlorocyclohexane (HCH), heptachlor epoxide, endrin, and 4,4'-DDT were found in either the creek water or sediments. Analysis of variance results indicated that only gamma-HCH had significant variation in the creek water among the sampling periods. Comparison of results with previous findings showed the presence of higher levels of HCH isomers and much lower DDT concentrations in the present study.

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Water-quality trends in the Rio Grande/Rio Bravo Basin using sediment cores from reservoirs

Cited by 29 publications

References 10 publications

Chemical quality of water, sediment, and fish in Mountain Creek Lake, Dallas, Texas, 1994-97

Chemical quality of water, sediment, and fish in Mountain Creek Lake, Dallas, Texas, 1994-97

Mercury contamination of the fish community of a semi‐arid and arid river system: Spatial variation and the influence of environmental gradients

Assessment of Organochlorine Pesticide Levels in Manadas Creek, an Urban Tributary of the Rio Grande in Laredo, Texas

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