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Seasonal abiotic parameters clearly influence ichthyofauna abundance, biomass and assemblages in River Minho tidal freshwater wetlands. Non-indigenous species heavily contributed for assemblages’ definition and their presence may become even more significant in a water temperature rise scenario.
Metal pollution is linked to potential human health risks in rural communities consuming fish from two contaminated reservoirs. Lead, antimony and chromium are potential health threats. The impact of acid mine drainage on fish and rural communities reliant on them are highlighted.
The precision of a macroinvertebrate multimetric index (MMI) was assessed by means of resampling methods.
MMI was highly affected by the heterogeneous distribution of taxa, especially with respect to abundance-based metrics.
The doubling of the sampling effort does not increase the precision of the MMI
Aquatic invertebrate assemblages (micro-, macrozooplankton and macroinvertebrates) in coastal wetlands in Southeastern Spain are greatly influenced by human disturbances (input of nutrients, water level manipulation), fish (influencing especially cladocerans) and spatial and temporal changes in variables, as conductivity and macrophytes.
- Initial fast-growing abilities of bloom-forming species assessed in mono vs mixed cultures.
- A low growth rate recorded in mixed cultures, suggesting possible competitive interactions under specific conditions.
- P. agardhii outcompete C. raciborski at low light intensity and high NO3- source; while C. raciborski outgrow at high NH4+ levels.
We report the ecological situation of two riverine wetlands before the requalification process by investigating the way the zooplankton assemblages respond to anthropogenic pressure. The presence of any extent of anthropogenic impact immediately influences the equilibrium of such delicate ecosystems and prejudices their relevant ecological role.
Eriocheir sinensis is an invasive species that spread in European waters as the result of human activity. During September 2013 E. sinensis population in the Tagus Estuary (Portugal) was sampled using fyke nets (n = 192). The captures from the Portuguese population were dominated by medium size individuals at the beginning of their reproducing cycle.
- Tubificid worms (imnodrilus hoffmeisteri) loosen sediment and increase the sediment water content and surface roughness.
- Tubificid worms increase suspended solids in the water column during light, moderate, and strong wind processes.
- Tubificid worms raise the proportion of fine particles in suspended solids.
