Archive of datasonic SIS-1000 chirp subbottom data collected during USGS cruise K-1-95-PS Lake Washington, State of Washington, 1995

2002 ◽  
Author(s):  
Christopher J. Lyon ◽  
Uri Brink ◽  
J.W. Nealon ◽  
William Danforth ◽  
Robert Kayen
Keyword(s):  
Washington State ◽  
Lake Washington

Post-Pollution: Characterizing Ecological Recovery in a Historically Nutrient Enriched Lake.

2018 ◽  
Author(s):  
Iain MacKenzie
Keyword(s):  
Washington State ◽  
Septic System ◽  
Algal Communities ◽  
System A ◽  
Chemical Measurements ◽  
Healthy State ◽  
Lake Bottom ◽  
Lake Washington ◽  
Lake Bottom Sediment ◽  
Reconstructive Techniques

An iconic story of recovery from nutrient pollution is the restoration of the heavily enriched Lake Washington in Seattle, Washington State. Originally an integral part of the municipal septic system, a diversion of wastewater in 1968 has allowed Lake Washington to return to what has been recently described as a natural and healthy state. Yet is it accurate to characterize a lake as “recovered” based purely on chemical measurements? Does a legacy of pollution linger on in the ecology of a lake system long after the lake has been given a clean bill of health?Using paleolimological reconstructive techniques it is possible to compare pre-pollution and post-pollution communities of algae by looking at microfossils stored chronologically in the lake-bottom sediment. Use of this technique has afforded a test of the assumption that once pollution stress in a lake is alleviated, the algal communities quickly return to the pre-pollution state. Work on Lake Washington indicates that this does not always hold true. Instead, it suggests that a legacy of pollution persists in the algae and ecological community of the lake long after the nutrient levels have returned to normal.

Comparison of parasite fauna of juvenile sockeye salmon (Oncorhynchus nerka) from southern British Columbian and Washington State lakes

1987 ◽  
Vol 65 (2) ◽  
pp. 420-431 ◽  
Author(s):  
R. E. Bailey ◽  
L. Margolis
Keyword(s):  
Sockeye Salmon ◽  
Trophic Status ◽  
Oncorhynchus Nerka ◽  
Parasite Fauna ◽  
Washington State ◽  
Nearest Neighbour ◽  
Cluster Analyses ◽  
Modes Of Transmission ◽  
Lake Washington ◽  
Neighbour Analysis

Sixteen species and juveniles of four taxa of parasites (Myxosporea, 4; Monogenea, 1; Trematoda, 5; Cestoda, 4; Nematoda, 2; Acanthocephala, 2; Copepoda, 2) were encountered in 1550 sockeye salmon (Oncorhynchus nerka) smolts and presmolts examined from 15 Fraser River lakes, Nimpkish Lake on Vancouver Island, and Lake Washington, Washington State, U.S.A. The most common taxa were Diphyllobothrium sp. (spp.?) plerocercoids, Philonema agubernaculum, Eubothrium sp., and Proteocephalus sp. Various statistical techniques (K - nearest neighbour and cluster analyses based on Jaccard and percent dissimilarity matrices) were used to compare the parasite fauna in sockeye from the different lakes. K - nearest neighbour analysis demonstrated that considerable overlap existed among many of the studied lakes, whereas little overlap occurred among other lakes. Cluster analyses revealed similar faunas among some lakes within biogeoclimatic zones and lakes of similar trophic status. Cluster analyses also revealed parasites that tended to co-occur. Parasites with similar modes of transmission or geographic range tended to cluster together.

scholarly journals Sulfur-Oxidizing Bacteria in Soap Lake (Washington State), a Meromictic, Haloalkaline Lake with an Unprecedented High Sulfide Content

2006 ◽  
Vol 73 (2) ◽  
pp. 451-455 ◽  
Author(s):  
Dimitry Y. Sorokin ◽  
Mirjam Foti ◽  
Holly C. Pinkart ◽  
Gerard Muyzer
Keyword(s):  
Soda Lakes ◽  
Washington State ◽  
Mono Lake ◽  
Sulfide Concentration ◽  
Rrna Gene ◽  
Lake Washington ◽  
Sulfur Oxidizing ◽  
Soap Lake ◽  
High Sulfide ◽  
Sulfur Oxidizing Bacteria

ABSTRACT Culture-dependent and -independent techniques were used to study the diversity of chemolithoautotrophic sulfur-oxidizing bacteria in Soap Lake (Washington State), a meromictic, haloalkaline lake containing an unprecedentedly high sulfide concentration in the anoxic monimolimnion. Both approaches revealed the dominance of bacteria belonging to the genus Thioalkalimicrobium, which are common inhabitants of soda lakes. A dense population of Thioalkalimicrobium (up to 107 cells/ml) was found at the chemocline, which is characterized by a steep oxygen-sulfide gradient. Twelve Thioalkalimicrobium strains exhibiting three different phenotypes were isolated in pure culture from various locations in Soap Lake. The isolates fell into two groups according to 16S rRNA gene sequence analysis. One of the groups was closely related to T. cyclicum, which was isolated from Mono Lake (California), a transiently meromictic, haloalkaline lake. The second group, consisting of four isolates, was phylogenetically and phenotypically distinct from known Thioalkalimicrobium species and unique to Soap Lake. It represented a new species, for which we suggest the name Thioalkalimicrobium microaerophilum sp. nov.

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