scholarly journals Perfluoroalkyl Substances in Plasma of Smallmouth Bass from the Chesapeake Bay Watershed

2021 ◽  
Vol 18 (11) ◽  
pp. 5881
Author(s):  
Vicki S. Blazer ◽  
Stephanie E. Gordon ◽  
Heather L. Walsh ◽  
Cheyenne R. Smith
Keyword(s):  
Land Use ◽  
Chesapeake Bay ◽  
Plasma Concentrations ◽  
Fish Tissue ◽  
Smallmouth Bass ◽  
Perfluoroalkyl Substances ◽  
Micropterus Dolomieu ◽  
Population Declines ◽  
Chesapeake Bay Watershed ◽  
Perfluorodecanoic Acid

Smallmouth bass Micropterus dolomieu is an economically important sportfish and within the Chesapeake Bay watershed has experienced a high prevalence of external lesions, infectious disease, mortality events, reproductive endocrine disruption and population declines. To date, no clear or consistent associations with contaminants measured in fish tissue or surface water have been found. Therefore, plasma samples from two sites in the Potomac River and two in the Susquehanna River drainage basins, differing in land-use characteristics, were utilized to determine if perfluoroalkyl substances were present. Four compounds, perfluorooctane sulphonic acid (PFOS), perfluoroundecanoic acid (PFUnA), perfluorodecanoic acid (PFDA) and perfluorododecanoic acid (PFDoA), were detected in every fish. Two additional compounds, perfluorooctane sulphonamide (PFOSA) and perfluorononanoic acid (PFNA), were less commonly detected at lower concentrations, depending on the site. Concentrations of PFOS (up to 574 ng/mL) were the highest detected and varied significantly among sites. No seasonal differences (spring versus fall) in plasma concentrations were observed. Concentrations of PFOS were not significantly different between the sexes. However, PFUnA and PFDoA concentrations were higher in males than females. Both agricultural and developed land-use appeared to be associated with exposure. Further research is needed to determine if these compounds could be affecting the health of smallmouth bass and identify sources.

scholarly journals Hyperpigmented melanistic skin lesions of smallmouth bass Micropterus dolomieu from the Chesapeake Bay watershed

2020 ◽  
Vol 139 ◽  
pp. 199-212
Author(s):  
VS Blazer ◽  
KT Young ◽  
GD Smith ◽  
AJ Sperry ◽  
LR Iwanowicz
Keyword(s):  
Chesapeake Bay ◽  
Normal Skin ◽  
Transcript Abundance ◽  
Skin Lesions ◽  
Smallmouth Bass ◽  
Micropterus Dolomieu ◽  
Fish Health ◽  
Susquehanna River ◽  
Chesapeake Bay Watershed ◽  
Viral Helicase

Hyperpigmented melanistic skin lesions (HPMLs) of smallmouth bass Micropterus dolomieu are observed in the Potomac and Susquehanna rivers, Chesapeake Bay watershed, USA. Routine, nonlethal population surveys were conducted at 8 sites on the mainstem Susquehanna River and 9 on the Juniata River, a tributary of the Susquehanna River, between 2012 and 2018, and the prevalence of HPMLs was documented. A total of 4078 smallmouth bass were collected from the mainstem Susquehanna River and 6478 from the Juniata River. Lesions were primarily seen in bass greater than 200 mm, and prevalence in the Susquehanna River (8%) was higher (p < 0.001) than in the Juniata River (2%). As part of ongoing fish health monitoring projects, smallmouth bass were collected at additional sites, primarily tributaries of the Susquehanna (n = 758) and Potomac (n = 545) rivers between 2013 and 2018. Prevalence in the Susquehanna River (13%) was higher (p < 0.001) than the Potomac (3%). Microscopically, HPMLs were characterized by an increased number of melanocytes in the epidermis or within the dermis and epidermis. RNAseq analyses of normal and melanistic skin identified 3 unique sequences in HPMLs. Two were unidentified and the third was a viral helicase (E1). Transcript abundance in 16 normal skin samples and 16 HPMLs showed upregulation of genes associated with melanogenesis and cell proliferation in HPMLs. The E1 transcript was detected in 12 of the 16 melanistic areas but in no samples from normal skin. Further research will be necessary to identify the putative new virus and determine its role in melanocyte proliferation.

Integrated analysis of ecosystem interactions with land use Change: The Chesapeake Bay watershed

2004 ◽  
pp. 263-275 ◽  
Author(s):  
Scott J. Goetz ◽  
Claire A. Jantz ◽  
Stephen D. Prince ◽  
Andrew J. Smith ◽  
Dmitry Varlyguin ◽  
...  
Keyword(s):  
Land Use ◽  
Land Use Change ◽  
Chesapeake Bay ◽  
Integrated Analysis ◽  
Chesapeake Bay Watershed ◽  
Ecosystem Interactions

Hydro-ecologic responses to land use in small urbanizing watersheds within the Chesapeake Bay watershed

2004 ◽  
pp. 41-60 ◽  
Author(s):  
Glenn E. Moglen ◽  
Kären C. Nelson ◽  
Margaret A. Palmer ◽  
James E. Pizzuto ◽  
Catriona E. Rogers ◽  
...  
Keyword(s):  
Land Use ◽  
Chesapeake Bay ◽  
Chesapeake Bay Watershed

scholarly journals Estimates of nitrate loads and yields from groundwater to streams in the Chesapeake Bay watershed based on land use and geology

2018 ◽  
Author(s):  
Silvia Terziotti ◽  
Paul D. Capel ◽  
Anthony J. Tesoriero ◽  
Jessica A. Hopple ◽  
Scott C. Kronholm
Keyword(s):  
Land Use ◽  
Chesapeake Bay ◽  
Chesapeake Bay Watershed

Interactions between natural-occurring landscape conditions and land use influencing the abundance of riverine smallmouth bass, Micropterus dolomieu

2011 ◽  
Vol 68 (11) ◽  
pp. 1922-1933 ◽  
Author(s):  
Shannon K. Brewer ◽  
Charles F. Rabeni
Keyword(s):  
Land Use ◽  
Decision Tree ◽  
Smallmouth Bass ◽  
Urban Stream ◽  
Micropterus Dolomieu ◽  
Soil Permeability ◽  
Group Designation ◽  
Natural Landscape ◽  
Population Potential ◽  
Tree Models

This study examined how interactions between natural landscape features and land use influenced the abundance of smallmouth bass, Micropterus dolomieu , in Missouri, USA, streams. Stream segments were placed into one of four groups based on natural-occurring watershed characteristics (soil texture and soil permeability) predicted to relate to smallmouth bass abundance. Within each group, stream segments were assigned forest (n = 3), pasture (n = 3), or urban (n = 3) designations based on the percentages of land use within each watershed. Analyses of variance indicated smallmouth bass densities differed between land use and natural conditions. Decision tree models indicated abundance was highest in forested stream segments and lowest in urban stream segments, regardless of group designation. Land use explained the most variation in decision tree models, but in-channel features of temperature, flow, and sediment also contributed significantly. These results are unique and indicate the importance of natural-occurring watershed conditions in defining the potential of populations and how finer-scale filters interact with land use to further alter population potential. Smallmouth bass has differing vulnerabilities to land-use attributes, and the better the natural watershed conditions are for population success, the more resilient these populations will be when land conversion occurs.

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