IMPACT OF URBANIZATION ON ABUNDANCE OF SOIL ARTHROPODS
SANJUKTA MANNA *
Department of Zoology, Maulana Azad College, 8 Rafi Ahmed Kidwai Road, Kolkata 700 013, India.
ARNAB KAR
Department of Zoology, Maulana Azad College, 8 Rafi Ahmed Kidwai Road, Kolkata 700 013, India.
*Author to whom correspondence should be addressed.
Abstract
Arthropods have important role in maintaining the soil fertility. The major contribution of arthropods to soil is through decomposition and humification of all organic matter. Both micro and macro arthropods were collected using standard Tullgren extractions on fortnightly intervals from five different sites selected on the basis of habitat differences, identified up to the level of order and counted during rainy season. Soil temperature was noted on the field sites while analysis for soil pH, texture, and soil moisture contents were done in the laboratory. This study suggested that rapid urbanization of Kolkata has led to a drastic change in land use and destruction of natural ecosystems which was also observed in a site, Digha (adjacent to Ramnagar), Purba Midnapore, West Bengal where unplanned urbanization hampers local biodiversity. Uncontrolled and unplanned tourism of Digha deteriorate the biodiversity and population dynamics of soil arthropods mainly of order Mesostigmata, Collembola and Coleoptera. Egra (Habitat E), adjacent to Digha showed highest diversity (as obtained from the calculated diversity indices) in June-July (monsoon) as it was favorable and resourceful for their breeding, proper growth and survival. The soil’s physical condition was correlated with changes in soil moisture and soil pH which in turn correlated with soil fauna. To understand the comparative biodiversity richness between the study areas, Shannon diversity index was calculated. Increasing soil alkalinity and decreasing moisture levels lowered the Shannon diversity index and accelerated the biological degradation to some extent in case of Egra and Ramnagar area. This study revealed that the metro city, Kolkata, with high pollution threats, can nonetheless harbor a large number of Prostigmata. Increased precipitation in June and July, 2018 and 2019, acted favorable on these mite population. By understanding soil arthropod communities will prove useful in developing management plans for both rural and urban ecosystems.
Keywords: Arthropods, urbanization, Mesostigmata, Collembola, Coleoptera.
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References
Bagyaraj DJ, Nethravathi CJ, Nitin KS. Soil biodiversity and arthropods: Role in soil fertility. Economic and Ecological Significance of Arthropods in Diversified Ecosystems, Springer Science & Business Media Singapore, A. K. Chakravarthy, S. Sridhara (Eds.). 2016;17-51. DOI: 10.1007/978-981-10-1524-3_2
Harris JA, Birch P. Soil microbial activity in opencast coal mine restorations. Soil Use and Management. 1989;5:155–160.
Smith JL, Halvorson JJ, Papendick RI. Using multiple-variable indicator kriging for evaluating soil quality. Soil Sci Soc Am J. 1993;57:743–749.
Kumar U, Singh R. Soil Fauna: A retrospection with reference to Indian soil. International Journal of Research Studies in Zoology. 2016;2(3):1-22.
Ghosh SN, Chattopadhyay A, Bhattacharyya DK. Studies on roadside soil of ants (Hymenoptera: Formicidae) of Kolkata with reference to the effects of lead emitted through automobile exhaust. Rec. Zool. Surv. India. 2007;257:1-149.
Macfadyen A. Notes methods for the extraction of soil arthropods. Journal of Animal Ecology. 1953;22:65-77.
Shakir MM, Ahmed S. Seasonal abundance of soil arthropods in relation to meteorological and edaphic factors in the agroecosystems of Faisalabad, Punjab, Pakistan. International Journal of Biometeorology; 2014. DOI: 10.1007/s00484-014-0874-9
Zhu X, Gao B, Yuan S, Hu Y. Community structure and seasonal variation of soil arthropods in the forest-steppe ecotone of the mountainous region in Northern Hebei, China. Journal of Mountain Science. 2010;7(2):187–196.
Ochsner TE, Logsdon S, Clay D, Moore D, Tsegaye T. Measuring soil temperature. ACSESS Publications; 2008. DOI: 10.2136/2008.soilsciencestepbystep.c18
Dowdeswell WH. Practical animal ecology. Methuen Educational Ltd., London. 1959;265.
Daji JA, Kadam JR, Patil ND. A text book of soil science. Media Promoters and Publishers Pvt. Ltd., Bombay; 1996.
Shannon CE, Weaner W. The mathematical theory of communication. Urbana: University of Illinois Press; 1963.