Aarif K.M.,Mary Matha Arts and Science College |
Prasadan P.K.,Mary Matha Arts and Science College |
Basheer P.M.,Palishakkottu Purayil |
Abdul Hameed S.V.,Farook College
Journal of Environmental Biology | Year: 2015
Data on population trend of birds in stop-over sites is a prerequisite for managers to implement/execute species/ecosystem-oriented conservation programme. However, such data for wetland birds and their associated ecosystems is meagre/unavailable in India. At this juncture, population trend of gulls in Kadalundi-Vallikkunnu Community Reserve (KVCR) was evaluated on the basis of primary and secondary data collected between 1989 and 2009. Data of 1,26,103 birds belonging to five species were recorded during the study. During 2005-2009, Black-headed Gull and Brown-headed Gull were dominant species, while Pallas's Gull and Slender-billed Gull were lesser in number. In response to data on observation made during 1989, population of scavenging gulls viz., Black-headed Gull and Brown-headed Gull was increased to 165 and 135% respectively, while the population of specialist gulls such as Pallas's Gull and Slender-billed Gull found to be stable or on decline. Increasing trend of scavenging gulls and declining pattern of specialist gulls could be attributed to the consequences of habitat loss and other anthropogenic pressure (over-fishing, mining, pro-human developmental activities and dumping of poultry wastes) in KVCR. Site-specific conservation measures need to be undertaken across the stop-over sites in the West and East Coast of India to conserve this vital habitat in the Central Asian Flyway. © Triveni Enterprises, Lucknow (India).
Aarif K.M.,Mary Matha Arts and Science College |
Muzaffar S.B.,United Arab Emirates University |
Babu S.,Salim Ali Center for Ornithology and Natural History |
Prasadan P.K.,Mary Matha Arts and Science College
Biodiversity and Conservation | Year: 2014
Shorebirds are globally experiencing declines due to habitat loss and anthropogenic disturbance. The Central Asian Flyway hosts significant shorebirds that winter in the Indian subcontinent. The current study examined the shorebird assemblages of Kadalundi-Vallikkunnu Community Reserve, an internationally important estuarine wetland in southwestern India, to determine changes in their assemblages in relation to habitat alterations. We conducted point counts from 2005 to 2012 in mudflats, mangroves, sandy beaches and shallow water areas in Kadalundi-Vallikkunnu Community Reserve. This study measured physicochemical variables as a proxy for anthropogenic change experienced as a result of rapidly increasing human populations combined with development. We examined rainfall data during the study period to determine associations with shorebird abundance. Stepwise linear regression showed that total nitrogen and rainfall were significantly related to shorebird abundance (bird count = 306 + 213 NO3--1.13 rainfall, F = 31.20, p < 0.001). High rainfall in a given year (one-way ANOVA F = 19.91, p < 0.001) and the previous year resulted in lower shorebird counts (one-way ANOVA F = 16.01, p < 0.001). Shorebirds declined during the study period and habitat use shifted significantly from mangroves and mudflats to sandy beaches (one-way ANOVA, F = 2.18, p = 0.034). Shorebirds also exhibited a gradual decline in diversity. We conclude that altered nutrient content in this wetland resulted in changes in the prey base in the four habitat types. Shorebirds responded to these changes by increasing the use of less preferred habitat (sandy beaches). The anthropogenic influences on the wetland are large (waste disposal, sand mining, disturbance due to development) and continued pressure may result in further decline of shorebird assemblages. The results from this study indicate that certain anthropogenic disturbances, such as waste disposal and sand mining, should be reduced to maintain and improve the integrity of this wetland. © 2014 Springer Science+Business Media Dordrecht.
Thomas A.K.,Smart Materials Analytical Research and Technology SMART Laboratory |
Abraham K.,Smart Materials Analytical Research and Technology SMART Laboratory |
Thomas J.,Kuriakose Elias College |
Saban K.V.,Mary Matha Arts and Science College
Ceramics International | Year: 2015
Abstract The effect of doping the A site (Ca) with La and B site (Ti) with Nb, on the grain formation, crystallographic structure, electrical properties and dielectric behaviour of CaCu3Ti4O12 is investigated over wide ranges of temperature (27-150°C) and frequency (50 Hz to 5 MHz). Microstructure investigation of the cast compound, Ca(1-3x)La2xCu3Ti(4-5x)Nb4xO12 (x=0, 0.02 and 0.04), using Scanning Electron Microscopy (SEM) showed that co-doping would result in grain growth inhibition. Rietveld refinement of the powder diffraction data confirmed a cubic, single phase structure with space group Im3. The steady increase in the lattice volume with increasing dopant concentration confirms the incorporation of the bigger dopant molecules in the lattice. Dielectric studies using HIOKI 3552-50 LCR Hi-Tester show that the room temperature dielectric constant would considerably increase due to co-doping. Impedance spectroscopic studies reveal that the compound is electrically heterogeneous, with semi conductive grain interior and insulating grain boundaries. Doping resulted in a decrease in grain boundary resistance and consequent increase in dielectric loss at low frequency. The dielectric behaviour of compound is explained on the basis of the Internal Barrier Layer Capacitance (IBLC) model. © 2015 Elsevier Ltd and Techna Group S.r.l.
Monoth T.,Mary Matha Arts and Science College |
P B.A.,Kannur University
Proceedings - 2010 International Conference on Cyberworlds, CW 2010 | Year: 2010
Visual cryptography is a kind of secret image sharing scheme that uses the human visual system to perform the decryption computations. A visual cryptography scheme allows confidential messages to be encrypted into k-out-of-n secret sharing schemes. Whenever the number of participants from the group (n) is larger than or equal to the predetermined threshold value (k), the confidential message can be obtained by these participants. Contrast is one of the most important parameters in visual cryptography schemes. Usually, the reconstructed secret image will be darker (through contrast degradation) than the original secret image. The proposed scheme achieves better contrast and reduces the noise in the reconstructed secret image without any computational complexity. In this method, additional pixel patterns are used to improve the contrast of the reconstructed secret image. By using additional pixel patterns for the white pixels, the contrast of the reconstructed secret image can be improved than in the case of existing visual cryptography schemes. © 2010 IEEE.
Joseph M.M.,Mary Matha Arts and Science College |
Joseph P.T.,Kannur University
Biochemical and Cellular Archives | Year: 2011
The effect of aerobic exercises, that is brisk walking on health related physical fitness level in the type 2 diabetic patients were analysed in this study. Critical review of experimental results reveals a significant improvement in the health related physical fitness levels in type 2 diabetes patients. Activities showed significant difference in health related physical fitness between controls group and experimental groups in type 2 diabetes patients. The study demonstrates the positive benefits of exercise on diabetes patients and may help patients, healthcare personnel and health experts to chalk out effective aerobic programmes for the control and management of diabetes. The finding and insights of the study may be directly translated into practical health management programs, especially in the management of diabetes and related illnesses.