{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T20:51:31Z","timestamp":1791319891802,"version":"4.3.1"},"reference-count":109,"publisher":"Oxford University Press (OUP)","issue":"1","license":[{"start":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T00:00:00Z","timestamp":1791244800000},"content-version":"vor","delay-in-days":278,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Southeastern Louisiana University\u2019s Center for Environmental Research and Department of Biological Sciences","id":[{"id":"https:\/\/ror.org\/0531xck41","id-type":"ROR","asserted-by":"crossref"}]},{"name":"the Schlieder Endowed Professorship","id":[{"id":"https:\/\/ror.org\/01zbzxe52","id-type":"ROR","asserted-by":"crossref"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,1,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>Understanding how contaminants influence physiological stress is vital for conserving aquatic organisms in increasingly altered environments. We examined whether exposure to cadmium (Cd) or perfluoropentanoic acid (PFPeA)\u2014a short-chain per- and polyfluoroalkyl substance\u2014altered neutrophil-to-lymphocyte ratios (NLRs) in largemouth bass (Micropterus nigricans) under controlled laboratory conditions. Using NLR as a leukocyte-based biomarker associated with physiological stress responses, we compared five groups (control, Cd low, Cd high, PFPeA low, PFPeA high) across four sampling periods (baseline, post-treatment, 3 h after an abrupt salinity increase and 7 days later). High PFPeA exposure elevated NLR values within 4 days of treatment relative to the other groups. Following salinity exposure, all groups exhibited acute increases in NLR; however, elevated NLR persisted only in the high-PFPeA group 1 week later. Neither Cd treatment nor low PFPeA exposure altered NLR relative to controls. Our findings suggest that high PFPeA exposure may alter leukocyte dynamics and influence the interpretation of leukocyte-based stress biomarkers in freshwater fishes exposed to additional environmental stressors. More broadly, xenobiotic contaminants may complicate the interpretation of physiological biomarkers used in conservation and management contexts.<\/jats:p>","DOI":"10.1093\/conphys\/coag077","type":"journal-article","created":{"date-parts":[[2026,9,17]],"date-time":"2026-09-17T19:12:56Z","timestamp":1789672376000},"source":"Crossref","is-referenced-by-count":0,"title":["Xenobiotic exposure may confound traditional stress biomarkers: evaluating perfluoropentanoic acid and cadmium effects on largemouth bass (\n                    <i>Micropterus nigricans<\/i>\n                    ) leukocyte profiles"],"prefix":"10.1093","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0009-0005-9381-9510","authenticated-orcid":false,"given":"Anthony Ryan","family":"Johnson","sequence":"first","affiliation":[{"name":"Center for Environmental Research, Department of Biological Sciences, Southeastern Louisiana University , 808 North Pine Street, Hammond, LA 70401 ,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7472-1976","authenticated-orcid":false,"given":"Tyler Steven","family":"Coleman","sequence":"additional","affiliation":[{"name":"Center for Environmental Research, Department of Biological Sciences, Southeastern Louisiana University , 808 North Pine Street, Hammond, LA 70401 ,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-0083-9498","authenticated-orcid":false,"given":"Jasmine B","family":"Nasser","sequence":"additional","affiliation":[{"name":"Center for Environmental Research, Department of Biological Sciences, Southeastern Louisiana University , 808 North Pine Street, Hammond, LA 70401 ,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0005-9745-8265","authenticated-orcid":false,"given":"Maggie","family":"McGreal","sequence":"additional","affiliation":[{"name":"Center for Environmental Research, Department of Biological Sciences, Southeastern Louisiana University , 808 North Pine Street, Hammond, LA 70401 ,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1289-9351","authenticated-orcid":false,"given":"Kyle R","family":"Piller","sequence":"additional","affiliation":[{"name":"Center for Environmental Research, Department of Biological Sciences, Southeastern Louisiana University , 808 North Pine Street, Hammond, LA 70401 ,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4500-9052","authenticated-orcid":false,"given":"Christopher 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