scholarly journals Environmental parameters and diversity of diatoms in the Aïn Dalia dam, Northeast of Algeria

2021 ◽  
Vol 22 (9) ◽  
Author(s):  
KARIMA HERAMZA ◽  
CHOUKRI BAROUR ◽  
AICHA DJABOURABI ◽  
WILLIA KHATI ◽  
CHAHINAISE BOUALLAG
Keyword(s):  
Temporal Dynamics ◽  
Abiotic Factors ◽  
Environmental Parameters ◽  
Biological Indicators ◽  
Aquatic Environments ◽  
Planktonic Diatom ◽  
North Eastern ◽  
Spatio Temporal ◽  
Polluted Waters

Abstract. Heramza K, Barour C, Djabourabi A, Khati W, Bouallag C. 2021. Environmental parameters and diversity of diatoms in the Aïn Dalia dam, Northeast of Algeria. Biodiversitas 22: 3633-3644. Diatoms have long been used as biological indicators of the quality of aquatic environments due to their important capacity to respond to environmental change. As this flora has been very little studied in Algeria, the present study aimed to monitor the Spatio-temporal dynamics of diatoms at the Aïn Dalia dam (north-eastern of Algeria) and determine the main abiotic factors contributing to these variations from June 2017 to May 2018 in four selected stations. Our results showed that the waters of Aïn Dalia dam waters vary from moderately (St1 and St3) to significantly polluted (St2 and St4). They host the community of planktonic diatom flora composed of 72 species. The interspecific biodiversity was marked in summer and autumn (57 and 56 species respectively) and in the St4 station (52 species). In terms of abundance, more than 40% of the overall density was found in the St4 station and the fall period. Among the dominant genera, Cyclotella, Thalassiosira, Synedra and Navicula are found in moderately polluted waters, while Nitzschia, Melosira and Surirella in significantly polluted waters. Some environmental parameters, including nutrients (PO43-and NO2-), SM, temperature, dissolved oxygen, and pH played a key role in the functioning and evolution of this lake. Hence, these parameters demonstrated important fluctuations during our study and influenced directly the diatom distribution. These results showed that diatom assemblages are influenced by anthropogenic disturbances, and can be used as indicators of environmental quality.

scholarly journals Benthic Community and Assessment of Water Quality Using Biological Index in RAMSAR, Ninh Binh

2021 ◽  
Author(s):  
Do Van Nhuong ◽  
Tran Nam Hai ◽  
Nguyen Thi Nga ◽  
Tran Duc Hau
Keyword(s):  
Water Quality ◽  
Species Composition ◽  
Water Quality Assessment ◽  
Biological Indicators ◽  
Aquatic Environments ◽  
Biological Index ◽  
Northern Vietnam ◽  
Freshwater Bodies ◽  
Assess Quality

Van Long, the largest wetland RAMSAR in delta areas of northern Vietnam, is a famous destination for tourists, which might influence on water quality and biodiversity. Two surveys in September 2019 and May 2020 aimed to determine species composition of macrozoobenthos and build biological indicators to assess the water quality for biodiversity conservation. Present findings report a list of 41 species in 27 genera, 14 families of macrozoobenthos (Gastropoda, Bivalvia, Crustacea - Decapoda) in Van Long. Of which, Gastropoda is the most abundant, accounting for 58.5% of the total number of species, followed by Crustacean (26.8%) and Bivalvia (14.6%). Both Shannon-Weiner biodiversity (H') and Margalef indices “d” in rainy season are higher than those in dry season (H '= 2.565 vs. 2.466 and d = 4.987 vs. 3.286, respectively). For water quality assessment, based on TCVN 7220-2: 2002, the water in Van Long RAMSAR is in low level of pollution. According to ASPT index on average (3.42), this parameter was under medium to heavily polluted. The results recommend utilizing family taxon of macrozoobenthos with the recorded scales to assess quality of aquatic environments of freshwater bodies in northern Vietnam.

scholarly journals Assessing the Wall-To-Wall Spatial and Qualitative Dynamics of the Brazilian Pasturelands, between 2010 and 2018, Based on the Analysis of the Landsat Data Archive

2021 ◽  
Author(s):  
Claudinei Oliveira-Santos ◽  
Vinicius Vieira Mesquita ◽  
Leandro Leal Parente ◽  
Alexandre de Siqueira Pinto ◽  
Laerte Guimaraes Ferreira
Keyword(s):  
Temporal Dynamics ◽  
Spatial Dynamics ◽  
Limited Resource ◽  
Change Scenario ◽  
The North ◽  
Pasture Quality ◽  
Spatio Temporal ◽  
Pasture Area ◽  
Degraded Pastures

The Brazilian livestock is predominantly extensive, with approximately 90% of the production being sustained on pasture, which occupies around 20% of the territory. In the current climate change scenario and where cropland is becoming a limited resource, there is a growing need for a more efficient land use and occupation. It is estimated that more than half of the Brazilian pastures have some level of degradation; however there is still no mapping of the quality of pastures on a national scale. In this study, we mapped and evaluated the spatio-temporal dynamics of pasture quality in Brazil, between 2010 and 2018, considering three classes of degradation: Absent (D0), Intermediate (D1), and Severe (D2). There was no variation in the total area occupied by pastures in the evaluated period, in spite of the accentuated spatial dynamics, with a retraction in the center-south and expansion to the north, over areas of ​​native vegetation. The percentage of non-degraded pastures increased ~12%, due to the recovery of degraded areas and the emergence of new pasture areas as a result of the prevailing spatial dynamics. However, about 44 Mha of the pasture area is currently severely degraded. The dynamics in pasture quality were not homogeneous in property size classes. We observed that in the approximately 2.68 million properties with livestock activity, the proportion with quality gains was twice as low in small properties compared to large ones, and the proportion with losses was three times greater, showing an increase in inequality between properties with more and less resources (large and small, respectively). The areas occupied by pastures in Brazil present an unique opportunity to increase livestock production and make available areas for agriculture, without the need for new deforestation in the coming decades.

scholarly journals Study of Temporal Variations in Species–Environment Association through an Innovative Multivariate Method: MixSTATICO

2021 ◽  
Vol 13 (11) ◽  
pp. 5924
Author(s):  
Mariela González-Narváez ◽  
María José Fernández-Gómez ◽  
Susana Mendes ◽  
José-Luis Molina ◽  
Omar Ruiz-Barzola ◽  
...  
Keyword(s):  
Environmental Changes ◽  
Abiotic Factors ◽  
Skeletonema Costatum ◽  
Species Conservation ◽  
Environmental Parameters ◽  
Biological Indicators ◽  
Temporal Variations ◽  
Multivariate Method ◽  
Eastern Equatorial Pacific ◽  
The Impact

The study of biotic and abiotic factors and their interrelationships is essential in the preservation of sustainable marine ecosystems and for understanding the impact that climate change can have on different species. For instance, phytoplankton are extremely vulnerable to environmental changes and thus studying the factors involved is important for the species’ conservation. This work examines the relationship between phytoplankton and environmental parameters of the eastern equatorial Pacific, known as one of the most biologically rich regions in the world. For this purpose, a new multivariate method called MixSTATICO has been developed, allowing mixed-type data structured in two different groups (environment and species) to be related and measured on a space–time scale. The results obtained show how seasons have an impact on species–environment relations, with the most significant association occurring in November and the weakest during the month of May (change of season). The species Lauderia borealis, Chaetoceros didymus and Gyrodinium sp. were not observed in the coastal profiles during the dry season at most stations, while during the rainy season, the species Dactyliosolen antarcticus, Proboscia alata and Skeletonema costatum were not detected. Using MixSTATICO, species vulnerable to specific geographical locations and environmental variations were identified, making it possible to establish biological indicators for this region.

scholarly journals Struktur Komunitas dan Keanekaragaman Makrobentos di Perairan Teluk Jakarta

2021 ◽  
Vol 14 (1) ◽  
pp. 115-126
Author(s):  
Diah Anggraini Wulandari ◽  
Ernawati Widyastuti ◽  
Ismiliana Wirawati ◽  
Riyana Subandi
Keyword(s):  
Sampling Method ◽  
Diversity Index ◽  
Biological Indicators ◽  
Industrial Sector ◽  
H Index ◽  
Species Dominance ◽  
The North ◽  
Index Value ◽  
Polluted Waters

AbstrakTeluk Jakarta di perairan Laut Jawa terletak di sebelah utara Provinsi DKI Jakarta memiliki potensi sangat besar baik sumber daya perairannya maupun sebagai pusat aktivitas dan jasa-jasa lingkungan. Potensi pusat aktivitas meliputi sektor industri, perhubungan, perdagangan, perikanan, pariwisata, dan kependudukan. Namun kondisi perairan Teluk Jakarta semakin lama semakin kritis. Kondisi ini berpengaruh terhadap biota makrobentos seperti Mollusca, Crustacea, Echinodermata, dan Polychaeta. Penelitian ini bertujuan untuk mengetahui struktur komunitas makrobentos dan status pencemaran perairan Teluk Jakarta berdasarkan indikator biologis. Metode pengambilan sampel menggunakan Grab Smith McIntyre sebanyak tiga kali ulangan pada 9 lokasi yang berbeda. Sampel dianalisis untuk memperoleh keanekaragaman dan struktur komunitas makrobentos, indeks keanekaragaman (H’), indeks kemerataan jenis (J’), serta kualitas perairan Teluk Jakarta. Hasil menunjukkan perairan Teluk Jakarta didominasi oleh Polychaeta dengan persentase 53% (422 individu), Mollusca 33%, Crustacea 13%, dan Echinodermata 1% dengan total individu makrobentos, yaitu 793 individu. Kelimpahan makrobentos paling tinggi, yaitu Mollusca jenis Ennucula sp. (186 individu), Crustacea jenis Apseudes sp. (41 individu), dan Echinodermata jenis Aphiuridae (3 individu). Keanekaragaman jenis di perairan Teluk Jakarta termasuk kategori sedang dengan H indeks 1–2, kondisi perairan tercemar sedang, dan indeks kemerataan jenis (J’) makrobentos tinggi dengan nilai indeks >0,75 yang menunjukkan tidak adanya dominansi spesies. Abstract Jakarta Bay is located in the north of DKI Jakarta Province which has enormous potential in its water resources and as a center for environmental services. The center services include the industrial sector, transportation, trade, fisheries, tourism, and population. However, Jakarta Bay waters have suffered critical damage. This condition affects on macrobenthos such as Molluscs, Crustaceans, Echinoderms, Polychaete so the aims of this study is to determine the diversity pollution status of Jakarta Bay based on biological indicators. The sampling method use Grab Smith McIntyre with three replications in 9 different locations. Samples were analyzed to determine the diversity and structure community of macrobenthos, diversity index (H'), index of Evenness (J’) and the water quality of Jakarta Bay based on biological indicators. The results show that Jakarta Bay waters are dominated by Polychaete with a percentage of 53% (422 individuals), mollusks 33%, Crustaceans 13%, and Echinoderms 1% with a total of 793 individuals. Crustaceans consist of 23 species which are dominated by Apseudes sp. Mollusks consist of 265 individuals dominated by Ennucula sp and Echinoderms dominated by Amphiuridae. The level of species diversity in the waters of Jakarta Bay is included in the moderate category with H index 1–2, with moderate polluted waters, and the evenness index (J’) is in the high category with an index value >0,75. It indicate the absence of species dominance.

scholarly journals Spatio-temporal dynamics of zooplankton communities (Rotifers, Cladocerans, Copepods) and water quality of Lake Léré (TCHAD)

2020 ◽  
Vol 5 (3) ◽  
pp. 805-823
Author(s):  
Safia Mahamat Tahir ◽  
Brahim Boy Otchoum ◽  
Mikail Abakar Ibrahim ◽  
Tchakonte Siméon ◽  
Enah Dickson Achuo ◽  
...  
Keyword(s):  
Water Quality ◽  
Temporal Dynamics ◽  
Spatio Temporal ◽  
Zooplankton Communities

scholarly journals Technical Note: Cost-efficient approaches to measure carbon dioxide (CO<sub>2</sub>) fluxes and concentrations in terrestrial and aquatic environments using mini loggers

2015 ◽  
Vol 12 (3) ◽  
pp. 2357-2380 ◽  
Author(s):  
D. Bastviken ◽  
I. Sundgren ◽  
S. Natchimuthu ◽  
H. Reyier ◽  
M. Gålfalk
Keyword(s):  
Temporal Dynamics ◽  
Co2 Flux ◽  
Technical Note ◽  
Aquatic Environments ◽  
Co2 Fluxes ◽  
Stream Network ◽  
Co2 Concentrations ◽  
Direct Measurements ◽  
Spatio Temporal ◽  
Global Carbon

Abstract. Fluxes of CO2 are important for our understanding of the global carbon cycle and greenhouse gas balances. Several significant CO2 fluxes in nature may still be neglected as illustrated by recent findings of high CO2 emissions from aquatic environments, previously not recognized in global carbon balances. Therefore it is important to develop convenient and affordable ways to measure CO2 in many types of environments. At present, direct measurements of CO2 fluxes from soils or waters, or CO2 concentrations in surface water, are typically labour intensive or require costly equipment. We here present an approach with measurement units based on small inexpensive CO2 loggers, originally made for indoor air quality monitoring, that were tested and adapted for field use. Measurements of soil–atmosphere and lake–atmosphere fluxes, as well as of spatio-temporal dynamics of water CO2 concentrations (expressed as the equivalent partial pressure, pCO2aq) in lakes and a stream network are provided as examples. Results from all these examples indicate that this approach can provide a cost- and labor efficient alternative for direct measurements and monitoring of CO2 flux and pCO2aq in terrestrial and aquatic environments.

scholarly journals Physical-chemical properties of the surface water from shallow lakes of the Matita-Merhei Unit, Danube Delta, Romania: current state and environmental significance

2021 ◽  
Vol 3 (2) ◽  
pp. 23-31
Author(s):  
Irina Catianis ◽  
◽  
Dumitru Grosu ◽  
Adriana Maria Constantinescu ◽  
Laura Tiron Dutu ◽  
...  
Keyword(s):  
Chemical Properties ◽  
Environmental Parameters ◽  
Biological Indicators ◽  
Repeated Measurements ◽  
Danube Delta ◽  
Potential Health ◽  
Local Conditions ◽  
Physical Chemical ◽  
Quality Of Water

This study aimed to assess the water quality of certain lakes (Bogdaproste, Trei Ozere and Radacinos) belonging to the Danube Delta, Romania. Deltaic ecosystems are subject to natural and man-made environmental stressors. If in the past these ecosystems were largely threatened by eutrophication and organic/inorganic pollution, nowadays, we must focus on hydro morphological impact. This refers to the physical character and water content of the aquatic environment, impoundment (dams and flood gate), channelization and embankments, as well as clog/siltation of lakes. Environmental parameters are those physical, chemical and biological indicators used to characterize a freshwater body, and, which vary in time and space. In this regard, 44 water samples were collected in the dry season from the three lakes, for analysis of physical-chemical quality indicators. A series of physical (T, EC, TDS, turbidity, TSS, transparency) and chemical parameters (pH, DO, nutrients, SiO2, TOC, SO42-, ORP, technophilic elements) were considered. The results obtained in the physical-chemical analyses revealed that the majority of parameters were found in line with enforcing environmental regulations. Despite that, P-PO43- and Cd concentration results of some samples were found above certain permissible limits set by the normative. Probably, these inadvertences can be associated with local conditions of the transitional deltaic environment. Further analysis is required conducting repeated measurements with the same question, meaning a routine monitoring, especially P-PO43- and Cd. Finally, it was concluded that the results of this study showed a good quality of water in investigated lakes that did not pose potential health and environmental problems related to the biota.

Spatial and temporal dynamics of Pacific capelin Mallotus catervarius in the Gulf of Alaska: implications for ecosystem-based fisheries management

2020 ◽  
Vol 637 ◽  
pp. 117-140 ◽  
Author(s):  
DW McGowan ◽  
ED Goldstein ◽  
ML Arimitsu ◽  
AL Deary ◽  
O Ormseth ◽  
...  
Keyword(s):  
Temporal Dynamics ◽  
Marine Ecosystem ◽  
Gulf Of Alaska ◽  
Data Series ◽  
Limited Information ◽  
Important Species ◽  
Multiple Data ◽  
Spatial And Temporal Dynamics ◽  
Spawning Areas ◽  
Spatio Temporal

Pacific capelin Mallotus catervarius are planktivorous small pelagic fish that serve an intermediate trophic role in marine food webs. Due to the lack of a directed fishery or monitoring of capelin in the Northeast Pacific, limited information is available on their distribution and abundance, and how spatio-temporal fluctuations in capelin density affect their availability as prey. To provide information on life history, spatial patterns, and population dynamics of capelin in the Gulf of Alaska (GOA), we modeled distributions of spawning habitat and larval dispersal, and synthesized spatially indexed data from multiple independent sources from 1996 to 2016. Potential capelin spawning areas were broadly distributed across the GOA. Models of larval drift show the GOA’s advective circulation patterns disperse capelin larvae over the continental shelf and upper slope, indicating potential connections between spawning areas and observed offshore distributions that are influenced by the location and timing of spawning. Spatial overlap in composite distributions of larval and age-1+ fish was used to identify core areas where capelin consistently occur and concentrate. Capelin primarily occupy shelf waters near the Kodiak Archipelago, and are patchily distributed across the GOA shelf and inshore waters. Interannual variations in abundance along with spatio-temporal differences in density indicate that the availability of capelin to predators and monitoring surveys is highly variable in the GOA. We demonstrate that the limitations of individual data series can be compensated for by integrating multiple data sources to monitor fluctuations in distributions and abundance trends of an ecologically important species across a large marine ecosystem.

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