gammarus pseudolimnaeus
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2017 ◽  
Vol 36 (4) ◽  
pp. 739-749
Author(s):  
Susan E. Lewis ◽  
Joseph J. Piatt ◽  
Abigail S. L. Lewis


2017 ◽  
Vol 177 (1) ◽  
pp. 100-111 ◽  
Author(s):  
Susan E. Lewis ◽  
Jason G. Freund ◽  
Morgan Beaver


2016 ◽  
Vol 31 (4) ◽  
pp. 571-581 ◽  
Author(s):  
Kaitlin L. Williams ◽  
Kelsey C. Navins ◽  
Susan E. Lewis


2012 ◽  
Vol 90 (12) ◽  
pp. 1414-1421 ◽  
Author(s):  
S.E. Lewis ◽  
A. Yokofich ◽  
M. Mohr ◽  
C. Kurth ◽  
R. Giuliani ◽  
...  

Bisphenol A (BPA) is an endocrine-disrupting compound that can enter aquatic systems through landfill leachate or wastewater effluent. Although impacts of BPA on vertebrates are well documented, its effects on invertebrates are less clear. Amphipods such as Gammarus pseudolimnaeus Bousfield, 1958 are often prevalent invertebrates in freshwater ecosystems and can provide a powerful invertebrate model system to investigate the endocrine-disruptive capabilities of BPA. However, techniques to assay hormone concentrations in amphipods, especially vertebrate-like steroid sex hormones, are not widespread. In this study, we (i) quantified estrogen concentrations in juveniles and in adult female amphipods; (ii) quantified testosterone concentrations in juveniles and in adult male amphipods; and (iii) delineated changes to estrogen and testosterone concentrations of adults and juveniles following a 9-day exposure to BPA at four levels: 0 (control), 10, 50, and 100 µg/L BPA. Tissue extracts from homogenized samples were analyzed for estrogen or testosterone concentrations via radioimmunoassay for each reproductive class of amphipod. Low concentrations of BPA significantly increased estrogen concentrations in adult females and in juveniles. Moderate and high concentrations of BPA significantly increased testosterone concentrations in adult males, and low and moderate concentrations of BPA significantly increased testosterone concentrations of juveniles.



2012 ◽  
Vol 91 (2) ◽  
pp. 159-163 ◽  
Author(s):  
Susan E. Lewis ◽  
Ashley Hodel ◽  
Thomas Sturdy ◽  
Rachelle Todd ◽  
Cassandra Weigl


2010 ◽  
Vol 83 (Suppl_1) ◽  
pp. 292-292
Author(s):  
Susan E. Lewis ◽  
Angela M. Yokofich ◽  
Rebecca Giuliani ◽  
Cassandra Kurth ◽  
Megan Mohr ◽  
...  








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