scholarly journals PROFIL VERTIKAL DAN HORIZONTAL PARAMETER SALINITAS, DHL, DAN TDS BERDASARKAN VARIASI MUSIMAN DI ESTUARI SUNGAI CITARUM

OSEANA ◽  
2021 ◽  
Vol 46 (1) ◽  
pp. 1-12
Author(s):  
Nurul Fahimah ◽  
Annisa Dwi Damayanti ◽  
Venny Ulya Bunga ◽  
Haryo Mubiarto
Keyword(s):  
Electrical Conductivity ◽  
Seasonal Variations ◽  
Rainy Season ◽  
Vertical Profile ◽  
Concentration Level ◽  
Dry Season ◽  
Estuary Mouth ◽  
A Value ◽  
The Difference ◽  
Total Dissolved Solid

Salinity, electrical conductivity (EC), and Total Dissolved Solid (TDS) are parameters that pose an important role in the distributions of environmental pollution substances in the estuary. The difference in salinity, EC, and TDS concentration vertically (based on the depth in the water column) and horizontally (based on the distance from the estuary mouth) will affect the process of pollutant’s transportation and transformation in the estuary. On the other hand, seasonal variations will also affect parameters. Therefore, the information related to the vertical and horizontal profiles of salinity and other parameters based on seasonal variations is necessary to study. The purpose of this study is to analyze the vertical profile and horizontal-vertical of salinity, EC, and TDS concentrations during the rainy season and dry season in the estuary of Citarum River. This research was conducted in April 2018 (rainy season) and August 2018 (dry season) when the low tide. The measurement of salinity, EC, and TDS was directly conducted in the field using a conductivity meter. The results show that the concentration level of salinity, EC, and TDS showed a vertical and horizontal difference in the estuary of the Citarum River. In addition, there are differences in the concentration of salinity, electrical conductivity, TDS in the rainy season and dry season in the estuary of the Citarum River. The level of TDS has a linear relationship between salinity and electrical conductivity, with a value of R2 >95%.

scholarly journals Coleopterans prospection associated to forest ecosystems of Swietenia macrophylla (King), Eastern Amazonia

2019 ◽  
Vol 40 (5) ◽  
pp. 1775
Author(s):  
Ruy Guilherme Correia ◽  
Francisco de Assis Oliveira ◽  
Leandro Silva de Souza ◽  
Raphael Lobato Prado Neves ◽  
Jéssy Anni Vilhena Senado ◽  
...  
Keyword(s):  
Functional Groups ◽  
Rainy Season ◽  
Forest Ecosystems ◽  
Dry Season ◽  
Forest Plantations ◽  
Pitfall Traps ◽  
Swietenia Macrophylla ◽  
The Difference

Few research on the entomofauna associated to forest plantations with Swietenia macrophylla (King) in Brazil has been reported. The aim of this study was to analyze the Coleoptera communities in forest ecosystems with S. macrophylla, Brazilian mahogany, with emphasis on the diversity of families and the main functional groups. The insects were collected through pitfall traps in three forest ecosystems: monoculture, consortium and forest enriched with Brazilian mahogany, during dry and rainy periods in two consecutive years. The identification of the captured insects occurred in the entomology laboratory of the Federal Rural University of Amazonia. The analysis was performed through Past Paleontological Statistic 3.14 and ANAFAU, where the difference was considered significant only when p ? 0.05. 11,358 specimens from 21 families were captured, of which 8,058 were sampled in the rainy season and 3,299 in the dry season. There was influence of seasonality and types of forest ecosystems during collection. The families Nitidulidae, Staphylinidae, Carabidae and Meloidae presented greater abundance and richness in the complex ecosystems. Anobiidae, Cerambycidae, Bostrichidae, Brentidae, Buprestidae, Curculionidae, Elateridae, Chrysomelidae and Lagriidae were considered to be pests and common to all studied ecosystems; however, the families Nitidulidae, Scarabaeidae, Tenebrionidae and Passalidae had the function of decomposers; Carabidae, Coccinellidae, Histeridae, Meloidae, Staphylinidae, Cantharidae and Hydrophilidae were the predators.

scholarly journals Hubungan Iklim Terhadap Produksi Serta Pendapatan Petani Karet di Kabupaten Padang Lawas Utara

2019 ◽  
Vol 1 (1) ◽  
pp. 56-67
Author(s):  
Irwansyah Nasution ◽  
Tumpal H.S. Siregar ◽  
Erwin Pane
Keyword(s):  
Rainy Season ◽  
Dry Season ◽  
Climate Variables ◽  
Climatic Variable ◽  
Climate Variable ◽  
The Difference ◽  
Relationship Of ◽  
Farmer Income ◽  
The Relationship ◽  
Rainy Days

This study examines the relationship of Climate Variables with Rubber Yield And Farmer Income In Three Subdistricts of Padang Lawas Utara.  This study aims to (1) to determine the effect of climate variable to rubber yield and, (2) To know the difference of farmer's income in rainy season and dry season. This research was conducted in March until May 2017. The result of research is climatic variable especially rainfall and rainy day very significant for influential  rubber yields in Three Subdistricts in Padang Lawas Utara. This may indicate that increasing rainfall amounts with higher rainy days cause a decrease in tapping days resulting in reduction of rubber productivity. There results also showed that farmers' income in rainy season difference in dry season whereas farmer income in dry season is higher than rainy season

EFFECTS OF ENVIRONMENTAL PARAMETERS ON PLANKTON ASSEMBLAGE IN AJIWA RESERVOIR, KATSINA STATE, NIGERIA

2021 ◽  
Vol 5 (1) ◽  
pp. 118-125
Author(s):  
U. F. Suleiman ◽  
S. Ibrahim ◽  
H. I. Isyaku ◽  
T. I. Nabila ◽  
A. Amir ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Dissolve Oxygen ◽  
Seasonal Variations ◽  
Correlation Matrix ◽  
Physicochemical Parameters ◽  
Oxygen Demand ◽  
Environmental Parameters ◽  
Biological Oxygen Demand ◽  
Laboratory Activities ◽  
Total Dissolved Solid

The effect of environmental (Physicochemical) and biological (plankton) parameters of Ajiwa reservoir were studied for a period of eight months (March–October 2018). Field and laboratory activities were carried out using standard protocols. Mean monthly values of Temperature ranged between 25.87±3.57°C–29.46±0.66°C, Electrical conductivity was between 32.00±3.46µs/cm–210.00±95.39µs/cm. Dissolve Oxygen, Total Dissolved Solid and Biological Oxygen Demand Means of monthly values ranges between 5.53±0.39mg/l–9.35±0.62mg/l, 33.087±0.06mg/l–84.01±4.37mg/l, and 2.69±0.34mg/l–7.27±1.88mg/l. While phosphate and nitrate means of monthly values ranges between 0.04±0.02mg/l–0.09±0.03mg/l, 0.03±0.01mg/l–0.09±0.02mg/l. Four Phytoplankton phyla dominated by Chlorophyta (387org/L), Euglenophyta (160 org/L), Cyanophyta (83 org/L) and Bacillariophyta (63 org/L) were recorded in the reservoir. The Zooplanktons fauna comprises of Rotifers (180 org/L), Cladocerans (149 org/L) and Copepods (78 org/L). Correlation matrix showed that there were significant correlation between Phytoplankton, Zooplankton and Physicochemical parameters. The composition of planktons in the reservoir were affected by seasonal variations and fluctuation of physicochemical parameters

Daily patterns in aerial activity by spinner dolphins in Fernando de Noronha

2017 ◽  
Vol 98 (5) ◽  
pp. 1151-1157 ◽  
Author(s):  
R.C. De Carli ◽  
F.J.L. Silva ◽  
J.M. Silva
Keyword(s):  
Seasonal Variations ◽  
Rainy Season ◽  
Relative Frequency ◽  
National Park ◽  
Dry Season ◽  
Body Parts ◽  
Fernando De Noronha ◽  
Spinner Dolphins ◽  
Daily Patterns

Activities displayed by animals are usually cyclic, and fluctuations in behavioural repertoires can be observed on a daily or seasonal timescale. The present study describes daily and seasonal variations in the aerial events – such as leaps, spins and slaps with body parts – by spinner dolphins in Baía dos Golfinhos, Fernando de Noronha Marine National Park, in Brazil. To measure aerial events by dolphins, we compiled and analysed data collected from January 2006 to December 2010. A total of 113,027 aerial events were recorded during 1431 days of land-based daytime observations. Our results show that the frequency of aerial events was positively correlated with the number of dolphins in the bay. The relative frequency of aerial events was higher in the rainy season, when compared with the dry season. Aerial activities also varied throughout the day, with dolphins being more active in the morning, specifically from 8:00 a.m. to 8:59 a.m., regardless of the season.

scholarly journals Pediatric infectious diseases admissions: Sex differences and seasonal variations

2021 ◽  
Vol 015 (02) ◽  
pp. 049-058
Author(s):  
Samuel Olorunyomi Oninla ◽  
Michael Olaniyan Onigbinde ◽  
Akinyemi Olaleye Fadugbagbe ◽  
Emmanuel Olaseinde Bello ◽  
Omolayo Adebukola Olubosede
Keyword(s):  
Sex Differences ◽  
Infectious Diseases ◽  
Seasonal Variations ◽  
Rainy Season ◽  
Malaria Incidence ◽  
Relevant Information ◽  
Dry Season ◽  
Incidence And Mortality ◽  
Significant Difference ◽  
Dry Seasons

Objective: This study set out to assess sex differences and seasonal variations in Pediatric Infectious Diseases (PID) admissions. Methods: One year retrospective study of PID admissions was conducted among children aged one month to 15 years. Relevant information retrieved from patients’ hospital records were dates of admission and discharge, age, sex, final PID diagnoses and outcome. Results: Of 1,035 patients’ records assessed, 603 (58.3%) were males and 432 (41.7%) females (p<0.001). Males in ages 1-12 and 13-59 months contributed largely to the gender difference. Over the 12 months period, PID admissions mean was 86.25±21.92, with rainy and dry seasons means of 92.57±20.7 and 77.4±20.9, respectively (p<0.001). Ages 13-19, 60-119 and ≥120 months had significantly higher admissions mean during the rainy season (p<0.001 in each group), while higher admissions occurred among ages 1-12months in dry season (p<0.001). Top six PID managed were malaria, gastroenteritis, pneumonia, septicemia, meningitis and typhoid, and males had higher incidence in all except for typhoid, with only malaria having significant difference (p<0.001). Malaria, septicemia and typhoid incidence were higher significantly during the rainy season, while gastroenteritis occurred more in the dry season. Overall fatality rate was 4.6%; females and males rates were 6.3% and 3.5%, respectively (p=0.661). Rainy and dry seasons mortality means were 5±1.77 and 2.6±0.8, respectively (p<0.001). Conclusion: Male children were more vulnerable to PID, with significant higher malaria incidence among them than females. PID incidence and mortality were significantly higher during the rainy season than dry. Malaria and gastroenteritis occurred significantly in rainy and dry seasons, respectively.

scholarly journals Nelayan Danau Tempe: Strategi Adaptasi Masyarakat dalam Menghadapi Kondisi Perubahan Musim

2019 ◽  
Vol 4 (1) ◽  
pp. 59
Author(s):  
Icha Musywirah Hamka ◽  
Hamka Naping
Keyword(s):  
Informal Sector ◽  
Rainy Season ◽  
Economic Hardship ◽  
Dry Season ◽  
Economic Conditions ◽  
Fishing Communities ◽  
South Sulawesi ◽  
Economic Culture ◽  
The Face ◽  
The Difference

This article aims to describe how the economic culture of fishing communities in the area of Lake Tempe, Wajo Regency, South Sulawesi, in the face of tough times in two seasons. The existence of Lake Tempe made a lot of people who lived around him rely and making the Lake as a place to look for earnings. Its unique characteristics make Lake Tempe utilized in different ways in accordance with the seasons. It makes the community experience different issues between rainy season and dry season. This research used qualitative methods to get the depiction as a whole on the question of research. The results showed that the activity of fishing communities is changing depending on the season. It has resulted in the community get to know two of the famine, with different problems. The difference of the season brings socio-economic conditions of the difference is then also bring the community on different adaptation patterns. In the rainy season, people are faced with the problem of floods, and in the dry season, people should experience times of economic hardship. For that matter, any other uses different patterns. The rainy season, they adapt by designing the House in accordance with the conditions of the flood. They made rakkeang, bale-bale, Pallangga and patto'do. In the dry season, they overcame economic hardship by switching professions to become farmers, builders, and other informal sector jobs.

scholarly journals Seasonal variations of water quality at Doreri Gulf, Manokwari, West Papua

2021 ◽  
Vol 890 (1) ◽  
pp. 012007
Author(s):  
L Sembel ◽  
D Setijawati ◽  
D Yona ◽  
Y Risjani
Keyword(s):  
Water Quality ◽  
Standard Deviation ◽  
Seasonal Variations ◽  
Coastal Waters ◽  
Rainy Season ◽  
Field Work ◽  
Dry Season ◽  
Low Concentrations ◽  
Seasonal Factors ◽  
West Papua

Abstract The character of Manokwari City’s coastal waters is strongly influenced by activity on the mainland. The degradation in Sawaibu Gulf’s water quality has an impact on water quality nearby, as well as the waters of the Field Work Center (BLK), Lemon Island, and Tanjung Manggewa, which is part of Doreri Gulf. The purpose of this study was to determine the water quality in Doreri Gulf according on location and season. In February-April (rainy season) and August-October (dry season) 2020, the research was carried out within Doreri Gulf, Manokwari, West Papua. Turbidity, salinity, pH, temperature, and dissolved oxygen are amongst the variables analyzed. Its statistical analyses were performed descriptively using standard deviation and ANCOVA to correlate seasons and locations. Temperature, DO, and pH were highest at location 2; salinity showed highest at location 3; and turbidity were highest at location 1. Low concentrations of DO, pH, and salinity were measured at location 1; temperature showed highest at location 3; and turbidity were highest at location 1. The dry season would have the highest temperature, DO, pH, and salinity concentrations, meanwhile the rainy season had enough highest turbidity. The study confirms that there are no variations in water quality between location of each variable and that seasonal factors comprise the majority of differences in water quality.

Seasonal variation of arthropod abundance in gaps and the understorey of a lowland moist forest in Panama

2007 ◽  
Vol 23 (2) ◽  
pp. 169-176 ◽  
Author(s):  
Lora A. Richards ◽  
Donald M. Windsor
Keyword(s):  
Rainy Season ◽  
Abiotic Factors ◽  
Food Resources ◽  
Dry Season ◽  
Young Leaf ◽  
Barro Colorado Island ◽  
Plant Densities ◽  
The Difference ◽  
Taxonomic Groups ◽  
Arthropod Abundance

Treefalls gaps contribute to the habitat heterogeneity of tropical forest floors. Previous studies have shown that these gaps play an important role in plant and bird communities, however less is known about their role in arthropod communities. Using eight Malaise traps we investigated the difference in arthropod abundance of 19 taxonomic groups between gaps and understorey for 21 wk during the rainy season and 8 wk in the dry season on Barro Colorado Island, Panama. More (33.8%) arthropods were collected in gaps during the rainy season and 32.2% more in the understorey during the dry season. To assess the possible factors contributing to these differences we measured light, plant densities and young leaf densities, as indicators of abiotic factors and food resources for insect herbivores. Arthropod abundance was negatively correlated with light in the dry season. Thus, abiotic stress may explain the pattern of abundance in the dry season. While there was no correlation with light in the rainy season, predator abundance was positively correlated with herbivore abundance. The plant and young leaf density data suggest that there is significantly higher food availability for herbivores in gaps. Thus, less stressful abiotic conditions and more food resources may contribute to more herbivores followed by more predators in gaps during the rainy season.

scholarly journals Effects of breeds and seaon on semen quality and fertility pf bucks in a humid tropical environment.

2021 ◽  
Vol 32 (2) ◽  
pp. 327-341
Author(s):  
N. Nwoko ◽  
S. N. Ibe
Keyword(s):  
Electrical Stimulation ◽  
Artificial Insemination ◽  
Rainy Season ◽  
Semen Quality ◽  
Progressive Increase ◽  
Dry Season ◽  
West African ◽  
Four Seasons ◽  
Semen Volume ◽  
The Difference

A breeding programme, which spanned over four seasons (early dry, late dry, and early rainy, late rainy), was carried with one west African Dwarf (WAD) buck, one red sokoto (RS) buck, eight WAD does and eight RS does. The buck were subjected electrical stimulation wiht an electrd-ejaculator and their semen collected and analysed.Fertility rate was significant (P<0.05) higher in WAD than in RS in early dry season. There was no significant eason effect (P,0.05). of season on fertility of WAD. Fertility was least in the early dry season in RS and the difference from other season was significant (P,0.05). The effect of season on both semen volume and concentration was significant (P,0.05). There was a progressive increase in both parameter from early dry season to late rainy season. However, RS showed superiorityover WAD in both parameters in all the seasons. There were no significant effects of breeds or season on allother parameters studied. The indication is that both breeds could be used for all-year-round breeding with adequate feeding in the zone. However, for purpose of artificial insemination, RS bucks, which produce larger quatities of semen with higher concentration, should be preferred.

scholarly journals Phytoplankton community structure changes in Thi Nai lagoon (South - Central Vietnam) from 2004 to 2020

2021 ◽  
Vol 43 (4) ◽  
pp. 75-94
Author(s):  
Huynh Thi Ngoc Duyen ◽  
Tran Thi Minh Hue ◽  
Tran Thi La Van ◽  
Phan Tuan Luom ◽  
Nguyen Ngoc Lam ◽  
...  
Keyword(s):  
Rainy Season ◽  
Dry Season ◽  
Mouth Area ◽  
Species Number ◽  
Phytoplankton Species ◽  
Biodiversity Indices ◽  
Phytoplankton Species Composition ◽  
South Central ◽  
The Difference ◽  
Using Data

Phytoplankton species composition, abundance, biodiversity indices and their influence by environmental conditions were examined in Thi Nai lagoon using data from four surveys in 2004, 2008, 2009 and 2020. A total of 367 taxa of phytoplankton belonging to ten groups was recorded, of which diatoms were dominant with over 60% of the total species. In Thi Nai lagoon, the number of phytoplankton species decreased from the upper lagoon (283 taxa) to the lagoon mouth area (224) and was lowest in river stations (139). The species number was much lower in the rainy season (<95 species) and increased from 2004 to 2020. Among the biodiversity indices, Shannon, ∆, s∆+, Λ+ and sФ+ were lower in the rainy season, whereas ∆*, ∆+ and Ф+ had lower values in the dry season. For long-term analysis, the differences were especially significant at upper and lower lagoon for ∆, ∆*, ∆+, s∆+ and sФ+. In the dry season, the mean density of phytoplankton was lower at the river stations and upper lagoon, but higher at the lower lagoon and the lagoon mouth area. There was a clear difference of species assemblages between the two seasons with average dissimilarities in each area ranging from 94.16% to 95.57%. During 2004–2020, the difference in ratios between the main phytoplankton groups were small over years but there was a complete change in dominance of particular species, assemblage dissimilarities were from 73.4 to 77.9, greatest between 2009 and 2020. The lagoon was low in biodiversity for the whole investigated time indicated by taxonomic index ∆+. Among biodiversity indices, species richness (S), taxonomic indices (∆*, s∆+), and phylogenetic indices (Ф+, sФ+) were more sensitive to the changes of the aquatic environment than other traditional indices.

Sign in / Sign up

Export Citation Format

Share Document