scholarly journals Infestation and Seasonal Fluctuation of Gamasid Mites (Parasitiformes: Gamasida) on Indochinese Forest Rat, Rattus andamanensis (Rodentia: Muridae) in Southern Yunnan of China

Biology ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 1297
Author(s):  
Peng-Wu Yin ◽  
Xian-Guo Guo ◽  
Dao-Chao Jin ◽  
Wen-Yu Song ◽  
Lei Zhang ◽  
...  
Keyword(s):  
Climatic Factors ◽  
Winter Season ◽  
Seasonal Fluctuation ◽  
Mite Species ◽  
Summer Season ◽  
The Body ◽  
Seasonal Fluctuations ◽  
Winter Type ◽  
Gamasid Mites ◽  
Southern Yunnan Of China

A 12-month consecutive investigation was made at Jingha village in southern Yunnan of southwest China from April 2016 to March 2017. A total of 2053 Indochinese forest rats (Rattus andamanensis Blyth, 1860) were captured and examined, which account for 84.69% (2053/2424) of all the animal hosts (rodents and other small mammals) at the investigation site. And 39.82% (13,531/33,980) of gamasid mites were identified from the body surface of R. andamanensis and they belong to 41 species, 10 genera, 3 subfamilies and 2 families. Of the 41 species of gamasid mites identified from R. andamanensis, Laelaps nuttalli Hirst, 1915 and Laelaps echidninus Berlese, 1887 were the most dominant with 70.63% and 20.67% of constituent ratios respectively. In monthly fluctuations of all the gamasid mites on R. andamanensis, the constituent ratio (Cr) and overall infestation mean abundance (MA) of the mites in 12 months showed two obvious peaks in January (winter season) and June (summer season). However, the two dominant mite species, L. nuttalli and L. echidninus, showed different patterns of seasonal fluctuations. Laelaps nuttalli occurred throughout the year, and its Cr and MA showed two prominent peaks in winter season (December and January) and summer season (June), which belongs to the summer-winter type of seasonal fluctuation. Laelaps echidninus also occurred on R. andamanensis throughout the year, but its Cr and MA showed only one peak in winter season (December and January), which belongs to the winter type of seasonal fluctuation. A negative correlation existed between two climatic factors (temperature and rainfall) and the infestations (Cr, prevalence PM and MA) of two dominant mite species (L. nuttalli and L. echidninus) on R. andamanensis (p < 0.05). Temperature and rainfall are considered to be two key factors that influence the seasonal fluctuations of the mites on the studied rat species.

Changes in External and Internal Quality Characteristics of Three Tomato Cultivars Grown at Seven Different Sowing Seasons

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 470e-470
Author(s):  
Md. Shahidul Islam ◽  
S. Khan ◽  
S.M.M. Hossain
Keyword(s):  
Climatic Factors ◽  
Seasonal Pattern ◽  
Tomato Fruit ◽  
Soluble Sugars ◽  
Winter Season ◽  
Quality Characteristics ◽  
Summer Season ◽  
Soluble Solids ◽  
Internal Quality ◽  
Sowing Time

Seasonal fluctuations of the physical and biochemical characteristics of three tomatoes, including two large-fruited and one cherry-fruited cultivars, were studied in seven different sowing time at an interval of 45 days. Seasonal variation were noted in the external and internal quality characteristics. The seasonal pattern of ripening exhibited a rapid first ripening during summer, followed by a progressive decline until the winter season. Fruits picked during early winter to spring had higher constituents compared to summer season. The fruits matured during the summer season showed higher accumulation of organic and ascorbic acid; but the crop duration was found to be shortened. On the other hand, the fruits matured during winter to spring season had higher firmness, soluble sugars and longer growing period. The lycopene synthesis was enhanced during spring to winter seasons. Of the climatic factors recorded, temperature is predominantly implicated in affecting tomato fruit quality. The results indicated that, firmness, total soluble solids and turning point of hue (arctan a*/b*) act as the indicators of fruit maturity, and breaker stage is more appropriate stage of harvesting in all the seasons studied. But regarding nutritional value and appearance, and for fresh consumption, pink stage of ripening is the best for harvesting. In the present study, although cropping season and growing temperature differed widely, but the cumulative temperature (°C day; from flowering to maturation) difference among growing seasons was small, and most suitable harvest period was found to be around 1000 °C day. Thus, for consumption, marketing and transportation, the fruits availing around 1000 °C days cumulative temperature are congenial to be harvested.

SEASONAL VARIATIONS IN THE AEROMYCOFLORA OF MENTHA ARVENSIS

2018 ◽  
Vol 24 (2) ◽  
Author(s):  
N. B. SINGH ◽  
K.L. TIWARI
Keyword(s):  
Relative Humidity ◽  
Seasonal Variations ◽  
Rhizopus Oryzae ◽  
Climatic Factors ◽  
Winter Season ◽  
Fungal Species ◽  
Summer Season ◽  
Curvularia Lunata ◽  
Mentha Arvensis ◽  
Syncephalastrum Racemosum

The survey of aeromycoflora over Mentha arvensis L. plants was carried out at Raipur. During investigation period, a total of 52 fungal species were recorded. Maximum 35 species recorded during winter season and minimum 19 species during summer season. The seasonal variations showed climatic factors influence the occurrence of aeromycoflora. Syncephalastrum racemosum, Alternaria alternate, Aspergillus niger, Cladosporium cladosporoides, Curvularia lunata, and Fusarium oxysporum were recorded in all the three seasons of the year. Emericella nidulans and Aspergillus japonicus were recorded during summer and rainy season. Mucor hiemalis f. silvaticus, Rhizopus oryzae, Curvularia clavata, Fusarium equiseti and Penicillium frequentans during rainy and winter season. Mycelia sterilia (White-ii) was recorded during summer and winter season only. Maximum number of fungal species i.e. 35 was recorded during winter season because of the favourable temperature (29.1ºC) and relative humidity (62.1%). Minimum numbers of fungal species i.e. 19 were recorded during summer season due to unfavourable temperature (38.4ºC) and relative humidity (46.1%).

scholarly journals On the relationship between milk yield and climatic factors

MAUSAM ◽  
2021 ◽  
Vol 43 (2) ◽  
pp. 195-198
Author(s):  
V.S. RAMACHANDRAN ◽  
N. M. MURALI
Keyword(s):  
Milk Yield ◽  
Climatic Factors ◽  
Monsoon Season ◽  
Winter Season ◽  
Summer Season ◽  
Northeast Monsoon ◽  
Negative Effect ◽  
Wind Chill Index ◽  
The Relationship ◽  
Semi Arid

Statistical analysis was carried out between seasonal milk yield and some of the derived climatic variables at a semi-arid tropical locality in Bangalore. The study revealed that the milk yields varied from the highest (9, 3 lit/cow/day) in summer season to the lowest (8, 5 lit/cow/day) in winter season and almost the same in both the monsoon season (8, 7 and 8, 5 lit/cow/day during southwest and northeast monsoon seasons). It was envisaged that the climatic components like wind chill index had negative effect while wetness index and photo-thermal heat units had both positive (summer and winter seasons) and negative (two monsoon seasons) influences on seasonal milk yields.

scholarly journals POLLUTION STATUS OF SURFACE WATER RESOURCES IN ARID REGION OF RAJASTHAN (INDIA)

2013 ◽  
Vol 22 ◽  
pp. 733-735
Author(s):  
CHANCHAL KACHHAWA
Keyword(s):  
Surface Water ◽  
Water Resources ◽  
Arid Region ◽  
Winter Season ◽  
Seasonal Fluctuation ◽  
Organic Pollution ◽  
Summer Season ◽  
Indian Desert ◽  
Surface Water Resources ◽  
Pollution Status

Present investigation deals with the evaluation of DO, BOD and COD of six surface water resources of Bikaner district which fall in arid region of Rajasthan – a part of Great Indian Desert, to determine pollution status. Water sample analysed for two years 2008-2009 showed these parameters beyond the limit of standard prescribed by WHO. These parameters also showed great seasonal fluctuation, indicating the degree of organic pollution more during summer season and least during winter season.

PREVALENCE OF PSEUDOINVERTA ORAIENSIS IN FRESH WATER FISH, CLARIAS BATRACHUS

2019 ◽  
Vol 25 (1) ◽  
Author(s):  
ADITYA NARAYAN
Keyword(s):  
Fresh Water ◽  
Monsoon Season ◽  
Winter Season ◽  
Uttar Pradesh ◽  
Summer Season ◽  
Clarias Batrachus ◽  
Fresh Water Fish ◽  
Water Fish

The present investigation deals with the prevalence of infection of cestode, Pseudoinverta oraiensis19 parasitizing Clarias batrachus from Bundelkhand Region (U.P.) India. The studies were recorded from different sampling stations of Bundelkhand region of Uttar Pradesh. For this study 360 fresh water fish, Clarias batrachus were examined. The incidence of infection, monsoon season (17.50%) followed by winter season (20.00%) whereas high in summer season (30.00%).

APPLICATION OF SHIFTING ASSAY OF STANDARDIZED INDIRECT AGGLUTINATION (SSIA) FOR DETECTION OF ANTIGENS OF NEWCASTLE DISEASE AND INFECTIOUS BURSAL DISEASE VIRUSES IN CHICKEN FAECES

2013 ◽  
Vol 83 (5) ◽  
Author(s):  
Phạm Hồng Sơn ◽  
Phạm Hồng Kỳ ◽  
Nguyễn Thị Lan Hương ◽  
Phạm Thị Hồng Hà
Keyword(s):  
Newcastle Disease ◽  
Winter Season ◽  
Summer Season ◽  
Infectious Bursal Disease ◽  
Infection Rates ◽  
Faecal Samples ◽  
Infectious Bursal Disease Viruses ◽  
Bursal Disease ◽  
Long Time ◽  
Higher Sensitivity

. Using the method of shifting assay of standardized indirect agglutination (SSIA), the prevalence of Newcastle disease viruses (NDV) and infectious bursal disease viruses (IBDV) in chickens reared in several districts of Thua Thien Hue province in the Spring-Summer and Fall-Winter seasons was determined. In the Spring-Summer season of 2011, about 22.3% of the chickens were infected with NDV, in which A Luoi  accounted for the highest percentage of 25% of the infected chickens and Huong Thuy  the lowest  of 18.2%. Meanwhile, 36% of the same chickens were infected with IBDV, with the highest percentage (46.66%) also in A Luoi and the lowest (30.3%) also in Huong Thuy. The intensity of NDV infection in the Spring-Summer season in A Luoi and Phu Vang was highest (GMT = 1.45), and in Huong Thuy lowest (GMT = 1.31). In addition, in the Fall-Winter season, about 46% of the chickens were infected with NDV and 46.3% with IBDV in Huong Thuy and Phu Vang – two neighbouring districts of Hue City, in which NDV was detected in 54.4% of the chickens in Huong Thuy and 33.9% in Phu Vang. In contrast, IBDV was detected in 41.9% and 52.7% of the chickens respectively in the two districts. The infection was not inter-dependent. Methodically, although the differences in the infection rates were insignificant with the accuracy of 95%, faecal samples showed higher sensitivity in SSIA analyses for both cases of NDV and IBDV infection in comparision with mouth exudates. By SSIA method, results could be read clearly with unaided eyes for a long time after the performance, and it was also proven applicable for cases of haemagglutinating viruses if proper treatments for depletion of animal RBCs’ surface agglutinins could be applied.

scholarly journals Climate Influence in Dendrochronological Series of Araucaria angustifolia from Campos do Jordão, Brazil

Atmosphere ◽  
2021 ◽  
Vol 12 (8) ◽  
pp. 957
Author(s):  
Daniela Oliveira da da Silva ◽  
Alan Prestes ◽  
Virginia Klausner ◽  
Táyla Gabrielle Gonçalves de de Souza
Keyword(s):  
Climatic Factors ◽  
Summer Season ◽  
Climatic Data ◽  
Araucaria Angustifolia ◽  
Paulo State ◽  
Show Evidence ◽  
Full Period ◽  
Wavelet Techniques ◽  
Climatic Time Series ◽  
Dendroclimatic Analysis

A dendrochronological series of Araucaria angustifolia was analyzed for a better understanding of the climatic factors that operate in Campos do Jordão city, São Paulo state, Brazil. The dendroclimatic analysis was carried out using 45 samples from 16 Araucaria angustifolia trees to reconstruct the precipitation and the temperature over the 1803–2012 yearly interval. To this end, Pearson’s correlation was calculated between mean chronology and the climatic time series using a monthly temporal resolution to calibrate our models. We obtained correlations as high as r=0.22(α=0.1) for precipitation (February), and r=0.21(α=0.1) for temperature (March), both corresponding to the end of the summer season. Our results show evidence of temporal instabilities because the correlations for the halves of 1963–2012 were very different, as well as for the full period. To overcome this problem, the dendrochronological series and the climatic data were investigated using the wavelet techniques searching for time-dependent cause–effect relationships. From these analyses, we find a strong influence of the region’s precipitation and temperature on the growth of tree ring widths.

scholarly journals Seasonal occurrence of some larval stages of endoparasites in three cyprinids from the Nwanedi-Luphephe dams, the Limpopo River System, South Africa

2015 ◽  
Vol 52 (3) ◽  
pp. 229-235 ◽  
Author(s):  
E. M. Mbokane ◽  
J. Theron ◽  
W. J. Luus-Powell
Keyword(s):  
Developmental Stages ◽  
River System ◽  
Intestinal Wall ◽  
The Body ◽  
Seasonal Occurrence ◽  
Seasonal Fluctuations ◽  
Metazoan Parasites ◽  
Larval Stages ◽  
Parasite Communities ◽  
Third Stage

Abstract This study provides information on seasonal occurrence of developmental stages of endoparasites infecting three cyprinids in the Nwanedi-Luphephe dams, Limpopo River System. Labeobarbus marequensis (Smith, 1841), Barbus trimaculatus Peters, 1852 and Barbus radiatus Peters, 1853 were investigated seasonally from January 2008 to October 2008. The following larvae of metazoan parasites were collected: Diplostomum sp. from the eyes of L. marequensis and B. trimaculatus; Ornithodiplostomum sp. from the gills of B. trimaculatus; Posthodiplostomum sp. from muscle, skin and fins of B. trimaculatus and B. radiatus; third-stage Contracaecum larvae (L3) from the mesentery fats and on the liver lobes of L. marequensis and B. trimaculatus and gryporynchid cestode larvae from the outer intestinal wall of B. radiatus. All the flukes encountered were metacercariae. Diplostomum sp. and Contracaecum sp. dominated the parasite communities. Their prevalence exhibited seasonal fluctuations with maxima in summer. Factors likely to influence fish infection such as the body size of fish and their condition factors were also briefly considered in this study.

Theoretical and Experimental Analysis for Performance of Wind Turbine

2020 ◽  
Vol 27 (4) ◽  
pp. 114-120
Author(s):  
Suaad danok ◽  
Kamal Twfek ◽  
Esraa Mansour
Keyword(s):  
Wind Turbine ◽  
Winter Season ◽  
Electric Energy ◽  
Ground Level ◽  
Summer Season ◽  
Energy Rate ◽  
Electric System ◽  
Sufficient Energy ◽  
Mechanic Energy ◽  
Power And Energy

This research depends on carrying out an applied and numerical analysis for capability to utilize winds turbines which considered as means of renewable and friendly energy to environment, and how to make use of this technology to generate electric energy in Kirkuk city. Where it was studied shifting kinetic energy of winds into mechanic energy and has been accomplishes install a horizontal-turbine in one of work sites in Kirkuk city of (16m) height of the ground level. It has tri-blades of (400W) power. It has been connected to an electric system supply designed and manufacture during the research period. In order to measure the voltage-difference and electric current consequently to measure the power and energy produced from the wind turbine and changed according to the wind speed alteration. Gauge records for two time seasons are taken by using the technology-programming of delicate controller in simultaneous work with meteorological system, so that it can set data-principle to be analyzed by using (MATLAB) program to find and check theoretical generated power compared with practical results and find the range of validity to generate the sufficient energy for domestic consumption. The results shows that summer season is better than winter season in using wind turbine in Kirkuk city. As the monthly energy rate produce during summer season has emerged to ten-time than monthly energy rate produced during winter season.

A note on annual reproductive rhythm in Marwari sheep of the Rajasthan Desert in India

1980 ◽  
Vol 30 (1) ◽  
pp. 153-156 ◽  
Author(s):  
J. P. Mittal ◽  
P. K. Ghosh
Keyword(s):  
Body Weight ◽  
Average Length ◽  
Live Weight ◽  
Reproductive Activity ◽  
The Body ◽  
Seasonal Effect ◽  
Western India ◽  
Seasonal Fluctuations ◽  
Body Weights ◽  
North Western

ABSTRACTSeasonal fluctuations in oestrous activity and live weight were studied in ewes of the Marwari breed indigenous to the Rajasthan Desert in north-western India. Of the ewes examined 80 to 100% were in oestrus every month of the year, indicating thereby the non-seasonality of female reproductive activity in this breed. On average, each ewe exhibited heat 18 times a year. The incidence of silent heats was low (4·2 %). The average length of an oestrous cycle was 17 days, while the actual period of oestrus varied from 24 to 48 h with an average of 36 h. No seasonal effect on these activities could be observed. The maximum and minimum body weights of the animals were recorded during the autumn (October) and summer (June) months respectively. The body weights differed significantly (P<0·05) between months. Sexual activity in these animals is, therefore, apparently not affected by changes in body weight. The continuous nature of oestrous activity in Marwari sheep may be economically exploited by regulating the lambing season according o t the prevailing ecological conditions and market demands, without the use of hormones.

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