Two previous mesocosm studies showed changes in glucosephosphate isomerase-2 (Gpi-2) allele frequencies in mosquitofish populations exposed to mercury for 111 d or two years. A previous selection component analysis of single-generation populations exposed for 111 d to 18 microg/L Hg suggested that female sexual selection and fecundity selection could contribute to changes in Gpi-2 allele freque...

Studies have shown that female mosquitofish living downstream of a paper mill located on the Fenholloway River, Florida, have masculinized secondary sex characteristics, including altered anal fin development and reproductive behavior. Masculinization can be caused by exposure to androgens in the water or from an alteration in aromatase activity in the fish. We hypothesized that aromatase activ...

This study provides an annotated checklist of the freshwater fish species recorded in lentic ecosystems Greece. Species distributional data were derived from extensive review published and unpublished sources evaluated for their consistency, adequacy reliability. Overall, 650 (149 natural 501 artificial) investigated which, 480 fishless or unavailable. In remaining 170 ecosystems, 122 taxa (bel...

The global increase in human population is driving a continuous conversion of land to anthropogenic uses. This major threat lotic ecosystems worldwide, as it compromises the biotic integrity and health rivers streams. Studies northern hemisphere have shown that effects urbanization on fish assemblages include decrease and/or loss diversity abundance native species, proliferation tolerant exotic...

Condition-specific competition is widespread in nature. Species inhabiting heterogeneous environments tend to differ in competitive abilities depending on environmental stressors. Interactions between these factors can allow coexistence of competing species, which may be particularly important between invasive and native species. Here, we examine the effects of temperature on competitive intera...

Short term nitrogen uptake dynamics in the marshes of the southern Everglades, USA, were determined through implementation of a field mesocosm and isotopic enrichment method. The approach was tested using six mesocosms, three enriched with a 300% N tracer, Ca(NO3)2 (6 98% N) and three unenriched mesocosms. This N tracer technique allowed the determination of nitrogen fluxes between key ecosyste...

Mitigation to offset the impacts of land development is becoming increasingly common, with reintroductions and created habitat programs used as key actions. However, numerous reviews cite high rates of poor success from these programs, and a need for improved monitoring and scientific testing to evaluate outcomes and improve management actions. We conducted extensive monitoring of a released po...