Loading...
Theses
Browse
4 results
Search Results
ThesisItem Open Access Spatio-temporal patterns in human-wildlife conflict in Kerala(Department of Wildlife Sciences College of Forestry, Vellanikkara, 2018) Shaji, M; KAU; Nameer, P OThe human-wildlife conflict (HWC) data for the period from 2006 to 2016 collected from the State Forest Department was analyzed in a GIS software – QGIS ver. 2.18. Asian Elephant was found to be involved in 47.7 per cent of the HWC incidences in Kerala, followed by Wild Boar (23.3 %) and Bonnet Macaque (17.3 %). 81 per cent of the conflict incidences occur in the Forest Divisions towards north of Palakkad Gap in Western Ghats. 64 per cent of the HWC incidences were reported from the three Fds in Wayanad District alone. High level of fragmentation of forest ecosystems, changes in cropping pattern, decreasing tolerance level of people towards wildlife, etc. may be contributing to high level of HWC incidences in North Kerala. HWC data of all the Forest Divisions (FD) were analyzed with geospatial tools and presented as heat maps, which depicts the spatial concentration of HWC incidences. Temporal variation of the HWC incidences was also analyzed and found that conflicts involving herbivores are higher during the months from June to December. Heat maps were generated for the villages with high incidences of HWC in Mannarkkad and Thrissur FDs. In Mannarkkad FD, Padavayal, Pudur and Kottathara Villages together experience nearly 50 per cent of the HWC incidences. Asian Elephant contributes to 79.9 per cent of the HWC incidences in this Division, followed by 9.1 per cent of Wild Boar and 6.5 per cent of Leopard. In Thrissur Forest Division, villages like Peechi and Mannamangalam only are exposed to conflicts by Asian Elephant, which accounts for ten per cent of the HWC in this Division. However, Wild Boar is involved in 53.1 per cent of the conflicts in this Division. Conflicts involving Wild Boar are high in villages like Pilakkad, Thonnurkkara, Varavoor, etc. Decadal changes in land use land cover was studied and found that there was a very high increase in the area under kharif crop in Mannarkkad FD. Within the villages with high intensity of conflict in this Division, a very high increase in the area under kharif crop is observed. In Thrissur FD also the area under kharif crop is increased in all the villages with high conflict intensity. The preventive measures adopted in Mannarkkad FD are elephant-proof trench and solar fencing. Elephant-proof trenches are dug at Pudur Village in Attappady Forest Range in less than a kilometer. Two to three year old solar fences only are maintained well and found to be functional. The solar fences installed during 2010 are completely damaged and not functional. The solar fences installed currently in this FD are not sufficient to contain the HWC incidences. No preventive measures were adopted in Thrissur Forest Division to prevent the HWC incidences. However, solar electric fences were installed in Peechi and Mannamangalam villages in Pattikkad Forest Range in 2016 along the boundary of the forests for a length of 20 km. More than 60 per cent of the respondents in Mannarkkad and Thrissur Forest Divisions, support the wildlife protection activities due to various reasons. The respondents had a low satisfaction level in Mannarkkad (57.8 per cent) and Thrissur (92.3 per cent) FD on the compensation pattern of Government. However, quick compensation was suggested by 39.7 per cent of the respondents in Mannarkkad FD and 43.8 per cent in Thrissur FD. 88.6 per cent of the respondents in Mannarkkad FD and 74.4 per cent of the respondents in Thrissur FD agree that among the government agencies, Kerala Forest Department is prompt in responding to the HWC related issues. A timely response from the Forest Department officials in reaching the conflict locations and quick release of compensation for the affected individuals will improve the tolerance level of people towards wildlife.ThesisItem Open Access Diversity, distributional status and ecology of poly-pores in forest ecosystems of Kerala(Department of Natural Resource Management, Vellanikkara, 2018) Adarsh, C K; KAU; Vidyasagaran, KThe study was carried out with the objectives to find out the diversity, distributional status and ecology of polypores in forest ecosystems of Kerala. The representative sample plots of major forest types on either side of the Palakkad gap were selected in order to get a good sampling to cover northern, central and southern regions of Kerala and all the major forest ecosystems viz., evergreen, semi-evergreen, moist deciduous, dry deciduous and shola forest. Three permanent sample plots of 100 m×100 m with subplots of 10 x 10 m were established in three different locations in each ecosystem (5 in south of Palakkad gap and 5 in north of Palakkad gap). Shendurney Wildlife Sanctuary and Periya forest range of North Wayanad forest division were selected to represent evergreen forest. Semi-evergreen forest plot was taken in From Neyyar Wildlife Sanctuary and Aralam Wildlife Sanctuary. The moist deciduous forest samplots were taken from Peechi-Vazhani Wildlife Sanctuary and Wayanad Wildlife Sanctuary. The dry deciduous forest sample plot were taken in Walayar forest range and Marayoor sandal forest. Eravikulam National Park and Brahmagiri shola of North Wayanad division were selected to locate sample plots of shola forest. Apart from the plot based sampling, opportunistic sampling method was also adopted to maximize the documentation of polypore fungal diversity and distribution. As part of opportunistic sampling, all the National Parks and Wildlife Sanctuaries were visited. The polypore collection was carried out during the southwest monsoon (June to September) and north-east monsoon (October to December) from the sample plots. Additionally, labelling, rot character identification, photography, recording macromorphological characters and details of substratum were also made on the illustrated data sheet. All the logs and branches ≥ 20 cm diameter were enumerated using standard equipments. The decay stage of the logs was determined according to a 5-grade scale (based on decay classification system of Pyle and Brown, 1998). An attempt has also been made to find out the effect of substrate features like diameter, type and decay class on the diversity and abundance of polypores. Various polypores associations was worked out along with the different phytosociological indicators like density, frequency, abundance, Simpson’s Index and Shannon-Weiner Index. All the trees in the sample plots (3x10 of 100 x 100) were identified and documented (both host and non host trees).371 Ninety five polypore species in fourty nine genera belonging to eight families were documented. The Polyporaceae was the dominant family with 42 species followed by Hymenochaetaceae (31), Fomitopsidaceae (6) and Meruliaceae (5). Meripilaceae and Ganodermataceae made their presence with 4 species each. The family Schizoporaceae was represented by 2 species. Only one species was reported from the family Phanerochaetaceae. Among the polypores documented, 64 species were annuals and 31 were perennials. While analyzing the rot characteristics of the recorded polypores, it was found that the white rot polypores have notable dominance over brown rot polypores. Of 95 species analyzed, 88 polypores were white rotters and only 7 species were brown rotters. An identification key was developed for the polypores documented from forest ecosystems of Kerala based on the micro and macro morphological features. During the present study, 14 species were found to be new records from Western Ghats and one species is reported for the first time from India. These species have been described based on the macro-morphology and micro-morphology. In evergreen forest at Shendurney Wildlife Sanctuary, Simpson’s Index of diversity was observed to be the highest (0.965) followed by evergreen forest of Periya Forest Range (0.958) and semi-evergreen forest at Aralam Wildlife Sanctuary (0.957). The lowest Simpson’s Index was recorded at dry deciduous forest at Marayoor and Walayar with 0.873 and 0.916 respectively. The shola forest at Eravikulam National Park and Brahmagiri was also recorded with low polypore diversity with Simpson’s Index 0.921 and 0.923 respectively. Shendurney Wildlife Sanctuary showed higher Shanon-Wiener Index value (3.637) followed by evergreen forest of Periya Forest Range (3.458) and semi-evergreen forest at Aralam Wildlife Sanctuary (3.354). The Margalef Richness Index was found to be highest in wet evergreen forest at Shendurney Wildlife Sanctuary (5.747) while it was 1.798 in dry deciduous forest at Marayoor. The evenness in distribution of polypores was observed to be highest in evergreen forest at Shendurney Wildlife Sanctuary and semi-evergreen forest at Neyyar Wildlife Sanctuary with Pielou's Evenness Index 0.908 and 0.905 respectively. The shola forest at Eravikulam National Park and Brahmagiri shola showed more Berger-Parker Dominance Index value 0.238 and 0.194 respectively. The lowest Berger-Parker Dominance Index value (0.076) was recorded in evergreen forest at Shendurney Wildlife Sanctuary. Sorenson’s Similarity Index was worked out to find the similarity of polypore community in different forest ecosystems of Kerala. The similarity between polypore community372 of each forest ecosystems in either side of Palakkad gap was found out. The similarity between each forest types on either side of Palakkad gap found to be more or less uniform (above 0.75) except the dry deciduous forest at Marayoor and Walayar (0.37). The overall similarity of forest on either side of Palakkad gap is found to be much higher (0.918) The influence of altitudinal variation in the distribution pattern of polypores in different forest ecosystems of Kerala were analyzed based on their occurrence along different altitudinal gradients. In all forest types the diversity and richness is decreasing along the altitude. The evenness of polypore is decreasing along the altitude in all forest types of Kerala. The dominance is increasing along the altitude in all forest types A total of 306 tree species belonging to 68 families were identified to occur in the selected sample plots and out of this, 168 species under 51 families were host species. Leguminosae and Lauraceae contributed 18 and 13 species respectively and they represented the major host families followed by Malvaceae (8), Meliaceae (8), Phyllanthaceae (8), Myrtaceae (7), Clusiaceae (6), Moraceae (6), Rubiaceae (6) and Rutaceae (6). Most of the species were host generalist and more or less evenly distributed among the host tree species. Among the substrate types, maximum polypore occurrence was observed on logs followed by branch/twig and snag while, living trees supported only few polypores in all forest ecosystems. Decay class association of polypores showed that the intermediate decay stages harboured the maximum in terms of number of species, number of fruitbodies and frequency of occurrence. The conceptual framework on primary ecological strategy revealed that polypores exhibits ruderal, combative and stress tolerant behaviours. The polypores documented from forest ecosystems of Kerala was classified into ruderal, combative and stress tolerant categories.ThesisItem Open Access Ecoanatomical characterisation and development of anatomical key of selected mangrove species of west coast of India(Department of Wood Science, College of Forestry, Vellanikkara, 2017) Anju S Vijayan; KAU; Anoop, E VThe present investigation focused on the ecoanatomical characterisation of the wood of 17 selected true mangroves collected from 10 locations in the Western Coast of India. A total of 221 characters listed in the IAWA (International Association of Wood Anatomists) list of card key features were studied for each species as there is a felt need for creating databases of mangrove wood anatomy which allows to quantify the relative amount of intra- and interspecific variation, as well as variation within and between the mangrove genera. Mangrove wood from West Coast of India is characterised by diffuse-porosity, scalariform to opposite vessel wall pitting, scalariform perforations with few bars or large number of bars. Most mangrove family members were found to have simple perforations, septate or non septate fibres with distinctly to minutely bordered pits, bordered, half bordered to simple pits, paratracheal parenchyma, apotracheal and banded parenchyma. Heterocellular to homocellular rays with mostly procumbant cells with one or several marginal row of square/upright cells was also observed in these mangrove genera. Short numerous vessels with small dimension and vessel grouping were also common. The most advanced characters like vestured pit, helical thickening, crystals and vessel occlusions were present in majority of the samples. A perforated card key based on the IAWA list of microscopic card features for mangrove identification was also prepared. The development of an IAWA based anatomical key will be helpful for the identification of mangrove species based on wood anatomy. The ecoanatomical characters such as vessel diameter, vessel frequency, vessel grouping, type of vessel plate, lateral wall pitting, type of pits of true mangrove species were studied and compared with data from their nearest upland relative. The ecoanatomical features of wood of mangrove species are correlated with xeromorphic nature of their upland relatives. Because of the highly variable and stressful environmental condition, the mangroves developed certain strategies and adaptations during their evolution. These special morphological and physiological adaptations made it for the mangrove species to survive in these conditions in contrast to their upland relatives. A safe hydraulic architecture is only one of the alternative ways for a plant to be able to survive in water stress situations. The modification of xylem hydrological structure of mangrove wood helps to balance safety versus efficiency of water transport system. These modifications of wood structure due to ecological conditions are the driving force to evolution of wood anatomy. Thus the evolution of mangrove genera has been shown to be likely driven by environmental condition and not by phylogeny. The general pattern of wood anatomy of mangrove genera of different families indicates convergent evolution. These trends of wood anatomy in mangrove species provide new examples of phenotypic plasticity in angiosperms. To ensure safety, certain primitive structures such as bordered pits, scalariform vessel plate, scalariform, transitional, opposite lateral wall pitting and vessel bars still persist in the true mangrove genera of the present investigation. Thus the development of wood anatomical characters in mangrove genera were an example of heterobatmy. The presence of mostly primitive wood character states suggest an unbroken occupancy of stressful habitat by its ancestral genera. Mangrove occurs in different families in which the gamut of wood specialization ranges from advanced to highly advanced features. Rhizophoraceae members were found to be the most primitive ones with less specialization whereas the other mangrove species were found to have highly advanced wood anatomical characters.ThesisItem Open Access Bird community structure in the sacred groves of northern kerala(Department of Wildlife Sciences, College of Forestry, Vellanikkara, 2014) Mandan Jyothi, Krishnan; KAU; Nameer, P OA study on the ‘Bird community structure in the sacred groves of northern Kerala’ was carried out during 2011-2014. Fifteen sacred groves, eight from Kannur and seven from Kasargod districts were selected for the study. The bird community was studied at each of these sacred groves. The bird study was done for three hours from 7h to 11h and 15h to 18h in each of the fifteen sacred groves. The study was repeated once in every two months in each of the sacred groves between March 2012 to December 2013. Thus a total of 168 visits and 1008 h of field work is done during the study period. The bird diversity was then correlated with various variables such as the size of the sacred grove, distance of the sacred grove to the nearest forest, altitude of the area and tree density. Tree diversity in the sacred groves was also studied and was correlated to bird diversity. Ten quadrats of 10x10m were taken in each of the sacred groves and trees having more than 10 cm girth was selected and GBH and height was measured. Socio-economic study was undertaken to know the awareness about the birds of the sacred grove and the perception about the significance of sacred grove among villagers. Ten respondents from each of the sacred groves were interviewed. A total of 111 bird species, belonging to 15 orders, 47 families and 90 genera were recorded from the sacred groves of northern Kerala. The species richness per sacred grove ranged from maximum of 55 to minimum 23. And the number of individuals of birds per sacred grove ranged from 576 to 203 birds. The bird diversity was highest in the Cheemeni Kavu, while the bird species richness was highest in the Verikkara Kavu. Sacred groves of northern Kerala supported 86.48 per cent of resident birds and 14.52 per cent of migratory birds. Twenty five percent of the birds found in the sacred groves were found to be forest-dependent birds. Two species of birds that are endemic to Western Ghats viz., Malabar Grey Hornbill (Ocyceros griseus) and Rufous Babbler (Turdoides subrufa) were recorded from sacred groves of northern Kerala. The bird community of the Kammadam Kavu and Thazhe Kavu was found to be distinct among the 15 sacred groves studied using the Correspondence analysis. Dendrogram based on Bray-Curtis similarity matrix identified broadly three clusters viz. Karaka Kavu to Cheemeni Kavu, Edapara Kavu to Kuduvakolangara Kavu and Thazhe Kavu to Kammadam Kavu. The numbers of endemic birds were found to be greatly influenced by the extent of the sacred grove. However number of forest birds was influenced by the altitude and tree density. A total of 130 tree species were reported from the sacred groves of northern Kerala. 14 species of trees were endemic to Western Ghats and seven were threatened, this includes one Critically Endangered (Vateria indica) and four Endangered (Hopea ponga, Hopea parviflora and Chionanthus mala-elengi, Evodia lunu-anekanda) and two Vulnerable tree (Cinnamomum perrottetii, Santalum album) species. Respondents in the sacred groves of northern Kerala had medium awareness about the birds and perception about the significance of the sacred groves of northern Kerala. Awareness was found to be influenced by caste, gender, education, knowledge about bird diversity in sacred grove and understanding the beneficial effect by birds among the respondents. The perception was influenced by occupation of the respondent, knowledge about bird diversity in sacred grove and understanding of beneficial effect by birds among the respondents. Important threats faced by sacred groves in northern Kerala were encroachment, degradation of vegetation in the sacred grove, dumping of waste into the sacred groves, deposition of solid waste through contaminated water, passages within the sacred grove, use of sacred grove for anti-social activities like for consumption of liquor, playing cards etc, and various construction activities taking places in some of the sacred groves. The Government should step in and take some bold initiatives for the conservation of the sacred groves. Incentives should be provided for the owners of the sacred groves for preserving these important biodiversity repositories outside the reserved forests and protected areas. Restoration planting should be taken up in the degraded sacred groves with community participation.