Seasonal variability of the reduction in estrogenic activity at a municipal WWTP

Water Research, Год журнала: 2008, Номер 42(12), С. 3075 - 3081

Опубликована: Март 5, 2008

Язык: Английский

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Endocrine active contaminants in aquatic systems and intersex in common sport fishes

Environmental Toxicology and Chemistry, Год журнала: 2016, Номер 36(4), С. 959 - 968

Опубликована: Сен. 2, 2016

Male fish are susceptible to developing intersex, a condition characterized by the presence of testicular oocytes. In present study, relationship between intersex and exposure estrogenic endocrine active contaminants (EACs) was assessed for 2 genera sport fish, Micropterus Lepomis, at 20 riverine sites. Seasonal trends relationships EACs (prevalence severity) were examined varying putative sources throughout North Carolina, identified as point sources, nonpoint reference Intersex in both genera, which documented first time wild-caught Lepomis. more prevalent (59.8%) severe (1.6 mean rank) Micropterus, highly correlation sediment. contrast, less common (9.9%) (0.2 Lepomis correlated water column. The authors found that concentrations polycyclic aromatic hydrocarbons, polychlorinated biphenyls, industrial EACs, estrogens highest source sites; however, no type variation prevalence or severity nor there seasonal EAC concentrations. authors' results associate genus-specific with specific classes fishes having biological, ecological, conservation implications. Environ Toxicol Chem 2017;36:959-968. © 2016 SETAC.

Язык: Английский

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Reticulate evolution as a management challenge: Patterns of admixture with phylogenetic distance in endemic fishes of western North America

Evolutionary Applications, Год журнала: 2020, Номер 13(6), С. 1400 - 1419

Опубликована: Июнь 15, 2020

Admixture in natural populations is a long-standing management challenge, with population genomic approaches offering means for adjudication. We now more clearly understand the permeability of species boundaries and potential admixture promoting adaptive evolution. These issues particularly resonate western North America, where tectonism aridity have fragmented reshuffled rivers over millennia, turn reticulation among endemic fishes, situation compounded by anthropogenic habitat modifications non-native introductions. The melding historic contemporary has both confused stymied management. underscore this case study that quantifies basin-wide group native introduced fishes employing double-digest restriction site-associated DNA (ddRAD) sequencing. Our approach: (a) admixed history 343 suckers (10 Catostomidae) across Colorado River Basin; (b) gauges within context phylogenetic distance "ecological specialization"; (c) extrapolates drivers introgression hybrid crosses involve as well invasive species. extends an entire freshwater basin expands previous studies limited scope geographically taxonomically. results detected involving all 10 species, alterations not only accelerating breakdown reproductive isolation, but also introgression. Hybridization occurred genus despite distance, whereas was subgenera, implicating and/or ecological specialization isolation. Understanding extent isolation multiple serves to disentangle their reticulate evolutionary histories provides broadscale perspective conservation

Язык: Английский

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Mercury and selenium accumulation in the Colorado River food web, Grand Canyon, USA

Environmental Toxicology and Chemistry, Год журнала: 2015, Номер 34(10), С. 2385 - 2394

Опубликована: Авг. 19, 2015

Abstract Mercury (Hg) and selenium (Se) biomagnify in aquatic food webs are toxic to fish wildlife. The authors measured Hg Se organic matter, invertebrates, fishes the Colorado River web at sites spanning 387 river km downstream of Glen Canyon Dam (AZ, USA). Concentrations were relatively high among compared with other large rivers (mean wet wt for 6 was 0.17–1.59 μg g –1 1.35–2.65 Se), but consistent longitudinal patterns or concentrations relative dam lacking. increased (slope = 0.147) δ 15 N, a metric trophic position, indicating biomagnification similar that observed freshwater systems. Organisms regularly exceeded exposure risk thresholds wildlife humans (6–100% 56–100% samples Se, respectfully, thresholds). In River, Grand Canyon, pose risks fish, wildlife, humans, findings present study add growing body evidence showing remote ecosystems vulnerable long‐range transport subsequent bioaccumulation contaminants. Management will remain challenge, as sources mechanisms extend far beyond park boundaries. Environ Toxicol Chem 2015;34:2385–2394. © 2015 SETAC

Язык: Английский

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Histopathology investigation on the Vardar chub (Squalius vardarensis) populations captured from the rivers impacted by mining activities

Ecotoxicology and Environmental Safety, Год журнала: 2016, Номер 129, С. 35 - 42

Опубликована: Март 14, 2016

Язык: Английский

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