scholarly journals Relationships Between Benthic Infauna and Groundwater Eutrophication On A Sandy Beach in Southern Brazil

2021 ◽  
Author(s):  
Luciano Lorenzi ◽  
Devon Gebauer Mayer ◽  
Bruna Conte Reginato ◽  
Paulo Roberto Pagliosa ◽  
David Valença Dantas ◽  
...  
Keyword(s):  
Sandy Beach ◽  
Urban Expansion ◽  
Industrial Effluents ◽  
Temporal Variations ◽  
Sandy Beaches ◽  
Coastal Zones ◽  
Benthic Infauna ◽  
Coastal Marine ◽  
Coastal Marine Ecosystems

Abstract Urban expansion in Brazilian coastal zones has caused various anthropic impacts on coastal marine ecosystems that have resulted from unorganized use and the lack of infrastructure projects. The inadequate disposal of domestic and industrial effluents in coastal waterbodies is notable, which can cause severe environmental problems. For sandy beaches, the relationships between the contamination of groundwater with domestic sewage and the possible effects on spatial and temporal variations in the density and composition of benthic infauna are still poorly understood. This work aimed to relate variations in benthic infaunal associations with the concentrations of groundwater nutrients in summer and winter on Enseada Beach. The greater concentrations of nutrients in water percolating through the sediment in the summer, increasing of domestic effluents, and periods of intense precipitation increased the contamination of the surface and groundwater. This contributes to an increase in the population density of Thoracophelia furcifera, demonstrating its use as an indicator of eutrophication of the groundwater, allowing monitoring and contribution to actions aimed at improving the environmental quality of sandy beaches.

scholarly journals Predation patterns and prey quality of medusae in a semi-enclosed marine lake: implications for food web energy transfer in coastal marine ecosystems

2013 ◽  
Vol 35 (6) ◽  
pp. 1305-1312 ◽  
Author(s):  
Isabella D'Ambra ◽  
William M. Graham ◽  
Ruth H. Carmichael ◽  
Alenka Malej ◽  
Vladimir Onofri
Keyword(s):  
Energy Transfer ◽  
Food Web ◽  
Marine Ecosystems ◽  
Prey Quality ◽  
Coastal Marine ◽  
Coastal Marine Ecosystems

scholarly journals Temporal variation of sandy beach macrofauna at two sites with distinct environmental conditions on Cassino Beach, extreme southern Brazil

2008 ◽  
Vol 56 (4) ◽  
pp. 257-270 ◽  
Author(s):  
Pedro de Sá Rodrigues da Silva ◽  
Luciano Peyrer das Neves ◽  
Carlos Emílio Bemvenuti
Keyword(s):  
Temporal Variation ◽  
Dominant Species ◽  
Sandy Beach ◽  
Temporal Variations ◽  
Sandy Beaches ◽  
Subtidal Zone ◽  
Low Density ◽  
Environmental Condition ◽  
Southern Brazil ◽  
Low Intensity

Temporal variations of the macrofauna of sandy beaches have been related to variations in the beach morphodynamics and also to the population dynamics of dominant species. The aim of this article is to describe the temporal variation of the intertidal macrofauna at two sites with distinct environmental condition on Cassino Beach, extreme southern Brazil. At each site three transect lines 50 m apart were defined perpendicular to the shore line, from which samples were collected monthly in triplicate at 4 intertidal levels (10 m apart) from June 2004 to May 2005. During winter a generally low density was observed, due to the absence of recruitments and to the mud deposition, which occurred just before sampling (in April 2004), and to low intensity stranding events. Spring witnessed a population explosion of Scolelepis gaucha, a migration of Mesodesma mactroides adults from the subtidal zone, and a strong stranding event. In the summer, recruitment of M. mactroides, Donax hanleyanus and Emerita brasiliensis was observed. Fall was characterized by low densities, except for D. hanleyanus recruitment. The macrofauna at both sites showed a striking seasonal variation in density and diversity, perhaps attributable to the recruitment of numerically dominant species and physical disturbances (stranding and mud deposition).

Assessing The Quality of Water Depth Derived From Volunteered Geographic Information (VGI) For Flood Monitoring. A Case Study of Hurricane Harvey In Harris County, Texas

2021 ◽  
Author(s):  
Abdullatif Alyaqout ◽  
T. Edwin Chow ◽  
Alexander Savelyev
Keyword(s):  
Water Depth ◽  
Temporal Distribution ◽  
Volunteered Geographic Information ◽  
Temporal Variations ◽  
Geographic Information ◽  
Text Messages ◽  
Quality Of Water ◽  
Significant Difference ◽  
Flood Monitoring

Abstract The primary objectives of this study are to 1) assess the quality of each volunteered geographic information (VGI) data modality (text, pictures, and videos), and 2) evaluate the quality of multiple VGI data sources, especially the multimedia that include pictures and videos, against synthesized water depth (WD) derived from remote sensing (RS) and authoritative data (e.g. stream gauges and depth grids). The availability of VGI, such as social media and crowdsourced data, empowered the researchers to monitor and model floods in near-real-time by integrating multi-sourced data available. Nevertheless, the quality of VGI sources and its reliability for flood monitoring (e.g. WD) is not well understood and validated by empirical data. Moreover, existing literature focuses mostly on text messages but not the multimedia nature of VGI. Therefore, this study measures the differences in synthesized WD from VGI modalities in terms of (1) spatial and (2) temporal variations, (3) against WD derived from RS, and (4) against authoritative data including (a) stream gauges and (b) depth grids. The results of the study show that there are significant differences in terms of spatial and temporal distribution of VGI modalities. Regarding VGI and RS comparison, the results show that there is a significant difference in WD between VGI and RS. In terms of VGI and authoritative data comparison, the analysis revealed that there is no significant difference in WD between VGI and stream gauges, while there is a significant difference between the depth grids and VGI.

Detection of the toxic substance dibutyl phthalate in Antarctic krill

2017 ◽  
Vol 29 (6) ◽  
pp. 511-516 ◽  
Author(s):  
Xiangning Han ◽  
Daicheng Liu
Keyword(s):  
High Performance ◽  
Dibutyl Phthalate ◽  
Antarctic Krill ◽  
Toxic Substance ◽  
Dioctyl Phthalate ◽  
Gas Chromatography Mass Spectrometry ◽  
Coastal Marine ◽  
Freeze Dried ◽  
Coastal Marine Ecosystems ◽  
Layer Chromatography

AbstractHigh-performance thin layer chromatography was performed to investigate the potential presence of four phthalic acid esters, dimethyl phthalate (DMP), diethyl phthalate (DEP), dibutyl phthalate (DBP) and dioctyl phthalate (DEHP), in Antarctic krill. The results revealed that in freeze-dried Antarctic krill levels of DBP (0.1043±0.0005 mg g-1 (104.3±0.05 mg kg-1)) were high. The structure of DBP in Antarctic krill was determined by gas chromatography-mass spectrometry. Its existence is of concern based on demonstrated harmful effects to animals and plants as Antarctic krill is a key part of the food chain in Antarctic coastal marine ecosystems. The adverse effects of DBP on Antarctic krill and the source of DBP should be explored in further research.

scholarly journals Toxicity and genotoxicity of water and sediment from streams on dotted duckweed (Landoltia punctata)

2014 ◽  
Vol 74 (4) ◽  
pp. 769-778 ◽  
Author(s):  
R Factori ◽  
SM Leles ◽  
GC Novakowski ◽  
CLSC Rocha ◽  
SM Thomaz
Keyword(s):  
Rural Areas ◽  
Test Organism ◽  
Industrial Effluents ◽  
Genotoxic Effects ◽  
Relative Growth ◽  
Fresh Biomass ◽  
Water And Sediment ◽  
Quality Of Water ◽  
Floating Macrophyte

Most rivers are used as a source to supply entire cities; the quality of water is directly related to the quality of tributaries. Unfortunately men have neglected the importance of streams, which receive domestic and industrial effluents and transport nutrients and pesticides from rural areas. Given the complexity of the mixtures discharged into these water bodies, this study aimed to evaluate the quality of water and sediment of ten tributaries of Pirapó River, in Maringá, Paraná State, Brazil. To this end, the free-floating macrophyte Landoltia punctata (G. Meyer) Les & D.J.Crawford was used as test organism in microcosm, and the toxicity of water and sediment samples was evaluated by the relative growth rate, dry/fresh biomass ratio, and genotoxic effects (comet assay). Samples of water and sediment of each stream were arranged in microcosms with L. punctata. Seven days later, plants were collected for analysis. Nutrient levels were higher than the reference location, indicating eutrophication, but the results indicated a toxic effect for only three streams, and a genotoxic effect for all streams.

scholarly journals Recovery of lakes and coastal marine ecosystems from eutrophication: A global meta-analysis

2016 ◽  
Vol 62 (2) ◽  
pp. 507-518 ◽  
Author(s):  
Michelle L. McCrackin ◽  
Holly P. Jones ◽  
Peter C. Jones ◽  
David Moreno-Mateos
Keyword(s):  
Meta Analysis ◽  
Marine Ecosystems ◽  
Coastal Marine ◽  
Coastal Marine Ecosystems
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