Forest cover, landscape patterns, and water quality: a meta-analysis

Landscape Ecology, Journal Year: 2023, Volume and Issue: 38(4), P. 877 - 901

Published: Jan. 19, 2023

Language: Английский

---

Transfer and transformations of oxygen in rivers as catchment reflectors of continental landscapes: A review

Earth-Science Reviews, Journal Year: 2021, Volume and Issue: 220, P. 103729 - 103729

Published: June 29, 2021

Language: Английский

---

Fifty years of ecological changes: Regime shifts and drivers in a coastal Mediterranean lagoon during oligotrophication

The Science of The Total Environment, Journal Year: 2020, Volume and Issue: 732, P. 139292 - 139292

Published: May 11, 2020

Language: Английский

---

Tidal influence on water quality indicators in a temperate mesotidal estuary (Tagus Estuary, Portugal)

Ecological Indicators, Journal Year: 2022, Volume and Issue: 136, P. 108715 - 108715

Published: Feb. 25, 2022

In mesotidal estuaries, the spatial and temporal variation of physicochemical biological parameters, thus water quality, is strongly influenced by tidal dynamics. Hence, to improve monitoring management strategies, it imperative understand how conditions affect quality parameters overall assessments. Multiple indexes indicators have been used address issues, reporting, mainly in scope Water Framework Directive (WFD). this work, effect on nutrients, dissolved oxygen, suspended solids (SPM), Secchi depth, chlorophyll a phytoplankton composition temperate estuary was assessed. Moreover, classification systems also evaluated. This study conducted at two stations (Barreiro Alcântara) located Tagus Estuary (Lisbon, Portugal), presenting different anthropogenic pressures. Nutrient concentrations were variables which yielded highest differences response conditions, especially Alcântara, where influence nearby outfall evident. Therefore, Alcântara presented stronger variability effect, classifications with less salinity classes. Results indicate that low neap tide best condition assess worst-case scenario due dilution factor. However, important highlight all should be sampled bodies. The using mean as metric (TRIX) more susceptible presence high nutrient general, while 90th percentile responded better several values an area lower concentrations.

Language: Английский

---

Effects of Biophysical Processes on Diel-Cycling Hypoxia in a Subtropical Estuary

Estuaries and Coasts, Journal Year: 2022, Volume and Issue: 45(6), P. 1615 - 1630

Published: Jan. 7, 2022

Language: Английский

---

Further evidence for increasing global near-shore eutrophication from the Estero Salado, Guayaquil, Ecuador

Continental Shelf Research, Journal Year: 2024, Volume and Issue: 278, P. 105271 - 105271

Published: June 18, 2024

Over the period 2016–2022 environmental data were obtained at four points in northern section of tropical Estero Salado (ES), inner coastal lagoon that flows through Guayaquil, largest city Ecuador. Surface water from more remote southern limit ES, El Morro was also sampled 2022. The study shows waters part this low salinity (<12) often hypoxic, occasionally approached anoxia, and slightly acidic (6.86 ± 0.67). same contained extremely high concentrations dissolved inorganic nitrogen which averaged between 2.00 16.3 μM for nitrite, 89.8–238 nitrate 35.0–758 ammonium whilst phosphorus 21.3–381 μM. Dissolved oxygen 22.4 129 μM, all samples <50% saturated. Additionally, remarkably total fecal coliforms Escherichia coli measured section, are well above national international standards. A trophic state index strongly indicates ES is hyper-eutrophic. Whilst nutrients lower Morro, they still exceeded those expected typical natural balanced estuaries, thus showing signs eutrophication. Two major drivers these hyper-eutrophic conditions north effectively no riverine inputs to flush system, nutrient being dominated by run off as industrial, wastewater sewage discharges, together with pulses associated seasonal rainfall. Based on comparison given here parameters several decades ago, situation has become worse over timescale. This trend follows dramatic increase population discharges polluted waters. needs improvements quality if it avoid further deleterious impacts local populations. fits into global increasing eutrophication estuarine Estimates using new measurements indicate exporting significant amounts DIN DIP Gulf Guayaquil then Eastern South Pacific.

Language: Английский

---

Spatial and temporal variations in environmental variables in relation to phytoplankton composition and biomass in coral reef areas around Unguja, Zanzibar, Tanzania

SpringerPlus, Journal Year: 2015, Volume and Issue: 4(1)

Published: Oct. 28, 2015

Phytoplankton can indirectly indicate health status of coral reefs due to their sensitivity changes in water quality parameters. This study explored the spatial and temporal variability nutrients relation phytoplankton community composition chlorophyll a concentration at Bawe, Mnemba, Chumbe Pongwe reef sites Unguja Island. In situ measurements dissolved oxygen, temperature, salinity pH were done every month for 1 year. Surface samples collected determination composition, concentration. Dissolved did not differ significantly among four (p > 0.05) but showed significant variations months < 0.05). Bawe had higher phosphate (1.45 ± 0.57 µg L−1) than (0.74 0.53 L−1), Mnemba (0.42 0.30 (0.28 0.10 L−1; p Similarly, nitrate (0.81 0.43 (0.33 0.14 (0.24 0.13 similar (0.90 0.35 However, values obtained all studied less 3 14 mg L−1 nitrate, respectively, eutrophic oceans. species dominated by Bacillariophyceae (70.83 %) some identified such as Ceratium sp., Dinophysis Protoperidinium Prorocentrum Oscillatoria sp. Dictyocha fibula are known produce toxins that affect fish species. (0.47 0.07 0.04 Chlorophyll was spatially inversely related distance from town while it temporally positively correlated with The revealed that, have low nutrient levels good health. existence toxic suggests careful consumption fisheries resources frequent monitoring Harmful Algal Blooms (HABs) is required. concentrations Island compared other calls mechanisms limit release domestic sewage households hotels safeguard reefs.

Language: Английский

---

Zooplankton variability at four monitoring sites of the Northeast Atlantic Shelves differing in latitude and trophic status

Journal of Plankton Research, Journal Year: 2017, Volume and Issue: 39(6), P. 891 - 909

Published: Sept. 13, 2017

Zooplankton abundance series (1999–2013) from the coastal sites of Bilbao 35 (B35), Urdaibai (U35), Plymouth L4 (L4) and Stonehaven (SH), in Northeast Atlantic were compared to assess differences magnitude seasonal, interannual residual scales variability, patterns seasonal variation relation latitudinal location trophic status. Results showed highest variability at SH consistent with its northernmost location, U35 associated an atypical event identified 2012 Bay Biscay, B35 likely related lower sampling frequency higher natural anthropogenic stress. Interannual zooplankton variations not coherent across sites, suggesting dominance local influences over large scale environmental drivers. For most taxa pattern northward delay annual peak being common feature. The between-site spring–summer mainly phytoplankton biomass, turn, latitude or nutrient enrichment. water cooling accounted for that increase second half year.

Language: Английский

---

Internal nutrients dominate load and drive hypoxia in a eutrophic estuary

Environmental Monitoring and Assessment, Journal Year: 2023, Volume and Issue: 195(10)

Published: Sept. 14, 2023

Language: Английский

---

Seasonal and interannual variability of mesozooplankton in two contrasting estuaries of the Bay of Biscay: Relationship to environmental factors

Journal of Sea Research, Journal Year: 2017, Volume and Issue: 130, P. 189 - 203

Published: May 9, 2017

Language: Английский

---