Informatics Publishing Limited

T. Bhattacharya , S. Sathyakumar

Abstract

The Chenab Valley in Urgam Reserve Forest of Chamoli District (Uttarakhand), was surveyed during March-April 2005, to estimate abundance and record observations on the group sizes, sex ratios, and habitat utilization patterns of Himalayan tahr and Goral. Encounter rate for tahr was 7.57 ± 1.17/hr scan and for goral, it was 0.47 ± 0.19 /km. Mean group size of Himalayan tahr (n=34), was 7.88±5.07 and for goral (n=21), it was 2.71±1.90. Himalayan tahr largely used the 2,500-3,500m altitude range, eastern and southern aspects, and steep slope categories. Goral mostly used the 2,000-2,500m altitude range, eastern and southern aspects, and moderate to steep slopes. Habitat utilization patterns of tahr and Goral show clear ecological separation between the two species. As Chenab Valley is located between the Kedarnath Wildlife Sanctuary and Nanda Devi Biosphere Reserve, it has significance and potential for conservation of Himalayan tahr, goral and other large mammals as this area lies outside the Protected Area network, but offers habitat contiguity and consequently movement of animal populations.

Keywords

Himalayan Tahr (Hemitragus jemlahicus), Goral (Nemorhaedus goral), Abundance,
Group Sizes, Habitat Use Patterns Chenab Valley, Chamoli, Uttarakhand

Full Text

     

B. Chattopadhya , T. Bhattacharya

Abstract

The paper presents a study on the population dynamics of blackbuck Antilope ceruicapra in Ballavpur wildlife sanctuary W.B., during the last 15 years (1967-1981). The population seems to be in a steady state, if not declining. The population density is high but male/female ratio is significantly low. Role of different environmental constraints were discussed Blackbucks in this sanctuary give birth to fawns throughout the year, with two peaks one during March-April and another during October - December.

Full Text

     

T. Bhattacharya ¹, K. K. Misra ²

Affiliations
1 Department of Zoology, Vidyasagar University, Medinipur 712102, IN
2 Department of Zoology, R. B. C. College, Naihati 743165, West Bengal, IN

Abstract

The objective of this work is to examine the effect of industrialization on the insects and arachmids of several members belonging to six arthropod orders, viz., Hemiptera, Orthoptera, Hymenoptera, Lepidoptera, Coleoptera and Araneae and their host plant relationship in the Falta export processing zone (FEPZ) and in non-industrial area. Fifteen study sites were selected for the research work, of which ten are within the industrial area covering 10 km of aerial distance of Falta industrial zone and fi ve sites of non-industrial area are 20 km to 32 km away of the industrial complex. The present study records the occurrence of 139 species of arthropods covering 5 insect orders (viz., Hemiptera, Lepidoptera, Coleoptera, Hymenoptera and Orthoptera) and one arachnid order Araneae, collected from 15 study sites of Falta Industrial Zone and adjoining non-industrial areas. These include 121 genera, 45 families and 5 sub-families of the above mentioned orders. This arthropod community were collected from 74 species of plants belonging to 30 families. These plants are commonly distributed in all 15 study sites. Four host plant families (Asclepiadaceae, Poaceae, Euphobiaceae and Solanaceae) harbour species of fi ve arthropod orders. Two host plant families, viz., Caparidaceae and Cypreraceae harbour only orthopteran insects. Two plant families (Polygonaceae and Boraginaceae) harbour hymenopteran insects. Two host plant families Chenopodiaceae and Caesalpiniaceae harbour only hemipteran insects. Eight host-plant families (Anonaceae, Saporaceae, Acanthaceae, Nyctaginaceae, Verbenaceae, Dioscoriaceae, Plamnaceae, and Flacourtiaceae) harbour only coleopteran insects. Two families Amaranthaceae and Rubiaceae harbour both coleopteran insects and arachnids whereas plants of Rhamnaceae family harbour only arachnids. The fi ndings are tabulated in the form of distribution pattern, host-family association and binary (presence/absence) data. The present work not only indicates a new aspect of biodiversity but also measures partially the quality of environment with regard to the bioindicator study recording the seasonal/ monthly abundance pattern of these insects

Keywords

Insect, Industrialization, Insect-Plant Relationship, Cluster Analysis, Bioindicator.

Full Text

     

T. Bhattacharya ¹, A. K. Chakraborty ¹, K. Pal ²

Affiliations
1 Department of Electrical Engineering, NIT Agartala, IN
2 Department of Mechanical and Industrial Engineering, IIT Roorkee, IN

Abstract

An equation has been developed to measure the efficiency of PV module instantly, if the climatic parameters of the area are known. The measured and calculated values of efficiency are verified to check the percentage error between them. It is observed that developed equation has very correlation with the measured values.

Keywords

PV Module Efficiency, Ambient Temperature, Wind Speed, Solar Radiation, Relative Humidity, Correlation.

Full Text

   

T. Bhattacharya ¹, A. K. Chakraborty ¹, K. Pal ²

Affiliations
1 Department of Electrical Engineering, NIT Agartala, IN
2 Department of Mechanical and Industrial Engineering, IIT Roorkee, IN

Abstract

The production of PV power depends on different meteorological parameters. Accumulation of dust is one of the factor which reduces the output power. The recent study was done in Tripura, India and there is maximum of 13% and minimum of 9% reduction in efficiency has been observed during the period of experiment.

Keywords

Photovoltaic, Dust, Open Circuit Voltage, Short Circuit Current, Module Efficiency, Degradation in Efficiency.

Full Text