Placer Mining Silt and its Relation to Salmon and Trout on the Pacific Coast

Smith, Osgood R.

doi:10.1577/1548-8659(1939)69[225:pmsair]2.0.co;2

Cited by 6 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Boone County is about midway in the course of the Des Moines River. Fish were collected at 17 places on the Des Moines River, but most of the detailed studies were made at 3 stations, described as follows : September, 1933, Des Moines River at Boone, Iowa Month 19331934193519361937193819391940 --------May 6 0 0 5 19 28 0 0 June 2 4 12 2 24 18 0 0 July 3 0 10 0 0 20 0 0 August 23 0 0 0 3 12 0 6 September 12 0 0 7 0 23 0 0…”

Section: Areamentioning

confidence: 99%

“…The increase in erosion silt and siltation no doubt has a harmful effect on the eggs, fry, and food supply. Smith (1940) discussing silt in relation to salmon and trout, stated that silt may limit or entirely prevent successful reproduction of these fishes and probably limits the food supply. Neave (1948) mentioned the possible destructive effect more frequent and severe floods would have on the eggs and alevins of the pink and chum salmon in British Columbia.…”

Section: Species Of Minnowsmentioning

confidence: 99%

See 1 more Smart Citation

Some Factors Affecting the Abundance of Minnows in the Des Moines River, Iowa

Starrett¹

1951

Ecology

View full text Add to dashboard Cite

Section: Areamentioning

confidence: 99%

Section: Species Of Minnowsmentioning

confidence: 99%

Some Factors Affecting the Abundance of Minnows in the Des Moines River, Iowa

Starrett¹

1951

Ecology

View full text Add to dashboard Cite

“…The resultant harm to benthic invertebrates and fish is well documented (Smith, 1940;Shaw and Maga, 1943;Cordonne and Kelly, 1961;Chutter, 1969;Simmons, 1984;Wagener, 1984), but few studies have dealt with effects on algal production.…”

Section: Introductionmentioning

confidence: 99%

EFFECTS OF PLACER GOLD MINING ON PRIMARY PRODUCTION IN SUBARCTIC STREAMS OF ALASKA¹

Nieuwenhuyse

LaPerriere

1986

J American Water Resour Assoc

View full text Add to dashboard Cite

Turbidity, total residues, settleable solids, vertical light extinction, and primary production were measured in mined and unmined streams located in the interior highlands of Alaska. Undisturbed streams had low turbidities (< 1 NTU), total residue concentrations averaging 120 mg i1, and undetectable settleable solids. During active mining, turbidity, total residues, and settleable solids levels in a moderately mined stream averaged 170 NTU, 201 mg l1, and <0.1 ml i1, respectively. In a heavily mined stream, turbidity and total residues were two orders of magnitude higher than in unmined streams and settleable solids nearly always exceeded 0.2 ml 1. Vertical extinction coefficients and turbidity were positively correlated. In undisturbed streams gross primary productivity (g-O2m2d) ranged from 0.20 shortly after spring breakup to a maximum of 1.20 in early fall. Productivity in the moderately mined stream was reduced by 50 percent while photosynthetic efficiency doubled. Primary production was undetectable in a heavily mined stream. Maximum standing crops of periphyton measured as chlorophyll a occurred in fall in an undisturbed stream after 13 weeks of exposure and ranged from 4.5 to 11.8 mg-chl a m2. The highest chlorophyll a densities recorded in the moderately mined stream was 3.8 mg m2, and no chlorophyl a was detected in the heavily mined stream. (

show abstract

Suspended sediment and turbidity after road construction/improvement and forest harvest in streams of the Trask River Watershed Study, Oregon

Arisméndi

Groom

Reiter

et al. 2017

Water Resources Research

View full text Add to dashboard Cite

Transport of fine‐grained sediment from unpaved forest roads into streams is a concern due to the potential negative effects of additional suspended sediment on aquatic ecosystems. Here we compared turbidity and suspended sediment concentration (SSC) dynamics in five nonfish bearing coastal Oregon streams above and below road crossings, during three consecutive time periods (“before”, “after road construction/improvement”, and “after forest harvest and hauling”). We hypothesized that the combined effects of road construction/improvement and the hauling following forest harvest would increase turbidity and SSC in these streams. We tested whether the differences between paired samples from above and below road crossing exceeded various biological thresholds, using literature values of biological responses to increases in SSC and turbidity. Overall, we found minimal increases of both turbidity and SSC after road improvement, forest harvest, and hauling. Because flow is often used as a surrogate for turbidity or SSC we examined these relationships using data from locations above road crossings that were unaffected by roads or forest harvest and hauling. In addition, we examined the association between turbidity and SSC for these background locations. We found a positive, but in some cases weak association between flow and turbidity, and between flow and SSC; the relationship between turbidity and SSC was more robust, but also inconsistent among sites over time. In these low order streams, the concentrations and transport of suspended sediment seems to be highly influenced by the variability of local conditions. Our study provides an expanded understanding of current forest road management practice effects on fine‐grained sediment in streams and introduces alternative metrics using multiple thresholds to evaluate potential indicators of biological relevance.

show abstract

Placer Mining Silt and its Relation to Salmon and Trout on the Pacific Coast

Cited by 6 publications

References 0 publications

Some Factors Affecting the Abundance of Minnows in the Des Moines River, Iowa

Some Factors Affecting the Abundance of Minnows in the Des Moines River, Iowa

EFFECTS OF PLACER GOLD MINING ON PRIMARY PRODUCTION IN SUBARCTIC STREAMS OF ALASKA¹

Suspended sediment and turbidity after road construction/improvement and forest harvest in streams of the Trask River Watershed Study, Oregon

Contact Info

Product

Resources

About

Placer Mining Silt and its Relation to Salmon and Trout on the Pacific Coast

Cited by 6 publications

References 0 publications

Some Factors Affecting the Abundance of Minnows in the Des Moines River, Iowa

Some Factors Affecting the Abundance of Minnows in the Des Moines River, Iowa

EFFECTS OF PLACER GOLD MINING ON PRIMARY PRODUCTION IN SUBARCTIC STREAMS OF ALASKA1

Suspended sediment and turbidity after road construction/improvement and forest harvest in streams of the Trask River Watershed Study, Oregon

Contact Info

Product

Resources

About

EFFECTS OF PLACER GOLD MINING ON PRIMARY PRODUCTION IN SUBARCTIC STREAMS OF ALASKA¹