The natural factors and anthropogenic stressors influence on Chironomidae communities of two north-African wadis

Mediterranean streams reveal high biodiversity and play a crucial role for local populations. North African wadis are less known than European streams. Hence, there is a need to explore factors influencing their communities. Chironomid assemblages of the Seybouse and El Kebir-west wadis, located in Algeria, were surveyed between July 2016 and July 2017. Among 28,045 collected larvae, 51 taxa were identified. The obtained results indicate that wadis saprobity, conductivity and pH vary seasonally. Air temperature and precipitation affect wadis differently in summer and winter. Two gradients driven by altitude define the river continuum: (1) the bottom substrate, from coarse to fine, and water quality, (2) the variety of meso-habitats from natural to anthropogenic. El Kebir-west, as a natural wadi, has unified communities throughout all its length. Communities of Seybouse vary due to the fact that this larger river is strongly influenced by human activity. Water management in Algeria should focus equally on water quality and natural habitats treatment.

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Long-term changes in microbial water quality indicators in a hydro-power plant reservoir: The role of natural factors and socio-economic changes

AMBIO ◽

10.1007/s13280-020-01470-1 ◽

2021 ◽

Author(s):

Gunta Spriņġe ◽

Māris Bērtiņš ◽

Lesya Gnatyshyna ◽

Ilga Kokorīte ◽

Agnese Lasmane ◽

...

Keyword(s):

Water Quality ◽

Power Plant ◽

Hydro Power ◽

Microbial Water Quality ◽

Economic Changes ◽

Water Quality Indicators ◽

Natural Factors ◽

Long Term Changes

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Remarkable Population Resilience in a North African Endemic Damselfly in the Face of Rapid Agricultural Transformation

Insects ◽

10.3390/insects12040353 ◽

2021 ◽

Vol 12 (4) ◽

pp. 353

Author(s):

Rassim Khelifa ◽

Hayat Mahdjoub ◽

Affef Baaloudj ◽

Robert A. Cannings ◽

Michael J. Samways

Keyword(s):

Land Cover ◽

Agricultural Land ◽

Large Population ◽

Agricultural Practices ◽

Agricultural Expansion ◽

North African ◽

Natural Habitats ◽

Agricultural Transformation ◽

The Face ◽

Terrestrial Habitats

Agriculture can be pervasive in its effect on wild nature, affecting various types of natural habitats, including lotic ecosystems. Here, we assess the extent of agricultural expansion on lotic systems in Northern Africa (Algeria, Tunisia, and Morocco) and document its overlap with the distribution of an endemic damselfly, Platycnemis subdilatata Selys, using species distribution modeling. We found that agricultural land cover increased by 321% in the region between 1992 and 2005, and, in particular, the main watercourses experienced an increase in agricultural land cover from 21.4% in 1992 to 78.1% in 2005, together with an increase in the intensity of 226% in agricultural practices. We used capture–mark–recapture (CMR) surveys in terrestrial habitats surrounding a stream bordered by grassland and cropland in northeastern Algeria to determine demographic parameters and population size, as well as cropland occupancy. CMR modeling showed that the recapture and survival probabilities had an average of 0.14 (95%CI: 0.14–0.17) and 0.86 (0.85–0.87), respectively. We estimated a relatively large population of P. subdilatata (~1750 individuals) in terrestrial habitats. The occupancy of terrestrial habitats by adults was spatially structured by age. Our data suggest that P. subdilatata has survived agricultural expansion and intensification better than other local odonate species, mainly because it can occupy transformed landscapes, such as croplands and grasslands.

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Analisis Kesesuaian Perairan untuk Keramba Jaring Apung di Kecamatan Sirah Pulau Padang Kabupaten Ogan Komering Ilir Provinsi Sumatera Selatan

Jurnal Lahan Suboptimal ◽

10.33230/jlso.8.1.2019.356 ◽

2019 ◽

Vol 8 (1) ◽

pp. 20-30

Author(s):

Rangga Bayu Kusuma Haris ◽

Indah Anggraini Yusanti

Keyword(s):

Water Quality ◽

Current Velocity ◽

Quality Parameters ◽

Chemical Parameters ◽

Chemical Laboratory ◽

M Current ◽

Bottom Substrate ◽

A Value ◽

Physical And Chemical Parameters ◽

Physical And Chemical

Haris et al, 2019. The Analysis of Water Suitability for Floating Net Sprouts in Sirah Pulau Padang, Ogan Komering Ilir District, South Sumatra Province. JLSO 8(1):20-30.The purpose of this study is to analyze the level of water suitability of the floating net sprouts in sirah pulau padang, ogan komering river, Serdang Menang Village, OKI South Sumatra Regency based on water physical and chemical parameters. This study was conducted on July - August 2018 at the Komering River, Ulak Jermun village, Terusan Menang Village, and Mangun Jaya Village, OKI District, South Sumatra. The data of sampling was divided into 3 stations, they were; station 1 was Ulak Jermun Village (3 ° 18'45.48 "LS and 104 ° 53'5.32" BT), station 2 was Terusan Menang Village (3 ° 17'14.13 "LS and 104 ° 52'46.78 "BT), and station 3 was Mangun Jaya village (3 ° 18'14.92" LS and 104 ° 52'59.48 "BT). The data of Samples were tested at the chemical laboratory in Palembang Public Water Fisheries and Extension Research Institute directly. The results of the study was for Station 1, Station 2, and Station 3 with a value was 48% with a good feasibility information. The results of measurements of water quality parameters, the pH was about 6.6 - 6.7, temperature was about from 24., 53 - 26.93oC, DO 3.93 - 4.36 mg / l, ammonia was about 0.78 - 0.16 mg / l, water brightness was about from 34.67 - 43.33 cm, CO2 4.53 - 5.03 mg / l, depth 2.36 - 2.47 m, current velocity was about 0.38 - 0.44 m / s, nitrate was about 0.37 - 0.439 mg / l, phosphate was about 0.009 - 0.225 mg / l and the bottom substrate of water was mud.

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Evaluasi Lahan Pembudidayaan Rumput Laut di Perairan Kampung Sakabu, Pulau Salawati, Kabupaten Raja Ampat

e-Journal BUDIDAYA PERAIRAN ◽

10.35800/bdp.2.3.2014.5705 ◽

2014 ◽

Vol 2 (3) ◽

Author(s):

Wihelmina Dimara ◽

Edwin D Ngangi ◽

Lukas L.J.J Mondoringin

Keyword(s):

Water Quality ◽

Quality Parameters ◽

Water Quality Parameters ◽

Environmental Condition ◽

Protection Factor ◽

Environment Factors ◽

Research Results ◽

Bottom Substrate ◽

Seaweed Culture

The objective of this research was to evaluate the suitability of several environment factors and water quality parameters for development of seaweed culture in Kampung Sakabu. The research was conducted through observation at three stations while protection factor and bottom substrate of waters were observed visually. Water quality parameters including pH, salinity, current rate, temperature were measured in situ and the compared to Standard Water Quality Citeria by Bakosurtanal 1996. Research results were divided into three suitability categories namely 1) very suitable, 2) suitable, and 3) less suitable. In general, environmental condition and water quatily in Kampung Sakabu were categorized as suitable to very suitable. This results indicated that waters of Kampung Sakabu was very potential for development of seaweed culture. Keywords: Kampung Sakabu, seaweeds, area suitability, water quality

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Interannual and long-term changes in the trophic state of a multibasin lake: effects of morphology, climate, winter aeration, and beaver activity

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/cjfas-2015-0249 ◽

2016 ◽

Vol 73 (3) ◽

pp. 445-460 ◽

Cited By ~ 1

Author(s):

Dale M. Robertson ◽

William J. Rose ◽

Paul C. Reneau

Keyword(s):

Water Quality ◽

Trophic State ◽

Secchi Depth ◽

Climatic Changes ◽

Main Flow ◽

Temperature And Precipitation ◽

Air Temperatures ◽

Long Term Changes ◽

P Sources

Little St. Germain Lake (LSG), a relatively pristine multibasin lake in Wisconsin, USA, was examined to determine how morphologic (internal), climatic (external), anthropogenic (winter aeration), and natural (beaver activity) factors affect the trophic state (phosphorus, P; chlorophyll, CHL; and Secchi depth, SD) of each of its basins. Basins intercepting the main flow and external P sources had highest P and CHL and shallowest SD. Internal loading in shallow, polymictic basins caused P and CHL to increase and SD to decrease as summer progressed. Winter aeration used to eliminate winterkill increased summer internal P loading and decreased water quality, while reductions in upstream beaver impoundments had little effect on water quality. Variations in air temperature and precipitation affected each basin differently. Warmer air temperatures increased productivity throughout the lake and decreased clarity in less eutrophic basins. Increased precipitation increased P in the basins intercepting the main flow but had little effect on the isolated deep West Bay. These relations are used to project effects of future climatic changes on LSG and other temperate lakes.

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Influence of natural factors and human impact on water quality in the river Kudma – small tributary of the Cheboksary reservoir

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/321/1/012046 ◽

2019 ◽

Vol 321 ◽

pp. 012046

Author(s):

O Erina ◽

E Vilimovich ◽

D Sokolov ◽

M Tereshina

Keyword(s):

Water Quality ◽

Human Impact ◽

Natural Factors ◽

Cheboksary Reservoir ◽

Small Tributary

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Application of environmetric methods to investigate control factors on water quality

Archives of Environmental Protection ◽

10.1515/aep-2017-0026 ◽

2017 ◽

Vol 43 (3) ◽

pp. 17-23 ◽

Cited By ~ 2

Author(s):

Hülya Boyacioglu ◽

Hayal Boyacioglu

Keyword(s):

Water Quality ◽

Multivariate Statistical Techniques ◽

Multivariate Statistical ◽

Reservoir Water ◽

Control Factors ◽

Natural Factors ◽

Run Off ◽

Water Quality Variation ◽

Low Levels ◽

Quality Variation

AbstractIn the study, environmetric methods were successfully performed a) to explore natural and anthropogenic controls on reservoir water quality, b) to investigate spatial and temporal differences in quality, and c) to determine quality variables discriminating three reservoirs in Izmir, Turkey. Results showed that overall water quality was mainly governed by “natural factors” in the whole region. A parameter that was the most important in contributing to water quality variation for one reservoir was not important for another. Between summer and winter periods, difference in arsenic concentrations were statistically significant in the Tahtalı, Ürkmez and iron concentrations were in the Balçova reservoirs. Observation of high/low levels in two seasons was explained by different processes as for instance, dilution from runoff at times of high flow seeped through soil and entered the river along with the rainwater run-off and adsorption. Three variables “boron, arsenic and sulphate” discriminated quality among Balçova & Tahtalı, Balçova & Ürkmez and two variables “zinc and arsenic” among the Tahtalı & Ürkmez reservoirs. The results illustrated the usefulness of multivariate statistical techniques to fingerprint pollution sources and investigate temporal/spatial variations in water quality.

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Spatial Differentiation of Water Quality Between Reservoirs Under Anthropogenic and Natural Factors Based on Statistical Approach

Archives of Environmental Protection ◽

10.2478/aep-2014-0002 ◽

2014 ◽

Vol 40 (1) ◽

pp. 41-50 ◽

Cited By ~ 3

Author(s):

Hülya Boyacioglu

Keyword(s):

Water Quality ◽

Management Practices ◽

Pollution Prevention ◽

Organic Pollution ◽

Temporal Variations ◽

Trend Detection ◽

Prevention Measures ◽

Western Turkey ◽

Natural Factors ◽

Study Results

Abstract This study illustrates the benefits of statistical techniques to analyze spatial and temporal variations in water quality. In this scope water quality differentiation caused by anthropogenic and natural factors in the Tahtali and Balçova reservoirs in western Turkey was investigated using discriminant analysis-DA, Mann Whitney U techniques. Effectiveness of pollution prevention measures was analyzed by Mann Kendall and Sen’s Slope estimator methods. The water quality variables were divided into three groups as physical-inorganic, organic and inorganic pollution parameters for the study. Results showed that water quality between reservoirs was differentiated for “physical-inorganic” and “organic pollution” parameters. Degree of influence of water quality by urbanization was higher in the Tahtali reservoir and in general, no trend detection at pollution indicators explained by effective management practices at both sites.

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Primacy of bottom-up effects on a butterflyfish assemblage

Marine and Freshwater Research ◽

10.1071/mf15012 ◽

2016 ◽

Vol 67 (8) ◽

pp. 1175 ◽

Cited By ~ 1

Author(s):

Susannah M. Leahy ◽

Garry R. Russ ◽

Rene A. Abesamis

Keyword(s):

Climate Change ◽

Water Quality ◽

Coral Reefs ◽

Fisheries Management ◽

Negative Association ◽

Feeding Guilds ◽

Top Down ◽

Management Tools ◽

Bottom Up ◽

Anthropogenic Stressors

The question of whether biological systems are maintained by top-down versus bottom-up drivers is a recurring one in ecology. It is a particularly important question to address in the management of coral reefs, which are at risk from a variety of anthropogenic stressors. Here, we explicitly test whether the abundance of different feeding guilds of coral-associated Chaetodon butterflyfishes are controlled by top-down or bottom-up drivers, and we assess the relative influence of all statistically significant drivers. We find that the abundance and species richness of Chaetodon butterflyfishes are predominately determined by bottom-up drivers. The abundance of corallivores is primarily driven by availability of branching and tabular live corals, whereas the abundance of generalists is most strongly influenced by a negative association with macroalgal cover. We also find evidence of weak top-down control on the abundance of corallivorous butterflyfish by gape-limited mesopredators, but no such effects on generalist butterflyfish. Our findings indicate that conservation of coral reefs for Chaetodon butterflyfishes must include management at a larger spatial scale in order to reduce the effect of coral reef stressors such as declining water quality and climate change, but should also include implementation of fisheries management tools in order to increase local herbivory.

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