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Chandrasekaran, S.
- On-Line Trade of Aesthetic Exotic Organisms: Sword of Damocles?
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PDF Views:119
Authors
Affiliations
1 Department of Plant Sciences, School of Biological Sciences, Madurai Kamaraj University, Madurai, 625 021, IN
1 Department of Plant Sciences, School of Biological Sciences, Madurai Kamaraj University, Madurai, 625 021, IN
Source
Current Science, Vol 109, No 8 (2015), Pagination: 1404-1410Abstract
Exotic organisms introduced into non-native ecosystems may invade and affect the native biodiversity, which might lead to serious ecological, economic and sociological threats. Among the various pathways of introduction of non-native species, on-line pet trading is the most recently emerged method which facilitates rapid introduction of exotic species. Though on-line trading has become an influential factor for the growth of world economy in the current scenario, its role in the introduction of exotic species and their subsequent consequences in countries like India is least studied. In this article we delineate the role of on-line trading in importing alien species to our doorsteps, which can cause serious threats to India's biodiversity and economy in near future. Our web survey revealed that 910 varieties of exotic fishes and 14 exotic animals are being sold through unregulated on-line trading in India. The number of exotic species recorded in this survey is not conclusive and may be the tip of the iceberg when compared to the ground reality in the country. Our interaction with the local people exposed that most of the sellers and buyers are naïve about the consequences of introducing these species into our native ecosystems. Our extensive field survey revealed that most of the exotic fishes were maintained in open tanks and no regulations were adopted to curtail their escape during maintenance of tanks, rains and floods. Greater abundance and biomass of Pterygoplichthys pardalis than the native edible fishes in freshwater ecosystem in Madurai, Tamil Nadu, South India is an example of invasion of ornamental fish into the wild. Bringing policy-level changes, multidimensional approaches to regulate on-line trade of exotic species will pave the way for protecting the native ecosystem from encroachment of exotic organisms.Keywords
Aquarium Trade, Biodiversity, Exotic Organisms, Invasion, On-Line Trade.Full Text
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- Studies on the Maintenance of 'Self-Sustained' Mosquito Vector Population in Vaigai River, South India
Abstract Views :383 |
PDF Views:92
Authors
Affiliations
1 Department of Plant Sciences, Madurai Kamaraj University, Madurai-625 021, IN
2 Centre for Research in Medical Entomology (ICMR), Madurai-625 002, IN
1 Department of Plant Sciences, Madurai Kamaraj University, Madurai-625 021, IN
2 Centre for Research in Medical Entomology (ICMR), Madurai-625 002, IN
Source
Current Science, Vol 110, No 1 (2016), Pagination: 57-68Abstract
Study of mosquito species diversity and its relationship with ecosystems is essential to understand disease epidemiology and to develop control measures of vector populations in human-dominated ecosystems. In the present study, the structure and composition of immature mosquito population and associated ecological parameters were analysed in three different ecosystems (urban, semi-urban and rural) along Vaigai river, Madurai, Tamil Nadu, India. Average larval density was higher in urban than the semi-urban and rural sites during the study period. In 2012-13, immature mosquito diversity was higher in rural site during pre-monsoon and monsoon seasons, whereas mosquito larval diversity was greater in semi-urban site during the post-monsoon season. In 2013-14, mosquito larval diversity was found to be high in semi-urban site during monsoon and post-monsoon seasons. Culicine species dominated the urban areas, while Anopheline species dominated the rural and semi-urban sites during the study period. Among the mosquito species, Culex tritaeniorhynchus, Cx. geldius, Cx. vishnuvi, Cx. quinquefasciatus, Cx. bitaeniorhynchus, Anopheles subpictus and An. culicifacies were prevalent throughout the year. Filamentous algal-dominated sites showed a higher number of mosquito species (23 species) than other hydrophytes-dominated sites. Maximum number of sewage inlets was recorded in urban than the other two sites. As a result, the highest turbidity level was recorded in the urban site followed by semi-urban and rural sites. The present study shows that the immature mosquito population is maintained with the help of ecological parameters in all the study sites throughout the year. Therefore, it is essential to take steps to eradicate the mosquito vectors from the Vaigai river basin to avoid disease outbreak in the region.Keywords
Animal Husbandry, Aquatic Vegetation, Larval Density, Sewage Inlets, Water Quality.Full Text
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- Impact of Prosopis juliflora on Nesting Success of Breeding Wetland Birds at Vettangudi Bird Sanctuary, South India
Abstract Views :254 |
PDF Views:99
Authors
Affiliations
1 Department of Plant Sciences, School of Biological Sciences, Madurai Kamaraj University, Madurai 625 021, IN
2 Thiagarajar College, Madurai 625 009, IN
3 School of Energy Sciences, Madurai Kamaraj University, Madurai 625 021, IN
1 Department of Plant Sciences, School of Biological Sciences, Madurai Kamaraj University, Madurai 625 021, IN
2 Thiagarajar College, Madurai 625 009, IN
3 School of Energy Sciences, Madurai Kamaraj University, Madurai 625 021, IN
Source
Current Science, Vol 106, No 5 (2014), Pagination: 676-678Abstract
No Abstract.Full Text
- Impact of Removal of Invasive Species Kappaphycus alvarezii from Coral Reef Ecosystem in Gulf of Mannar, India
Abstract Views :225 |
PDF Views:92
Authors
B. Kamalakannan
1,
J. Joyson Joe Jeevamani
1,
N. Arun Nagendran
2,
D. Pandiaraja
2,
S. Chandrasekaran
3
Affiliations
1 Department of Botany, National Centre of Excellence in Statistical and Mathematical Modelling in Bioresources Management (MHRD), Thiagarajar College, Madurai 625 009, IN
2 National Centre of Excellence in Statistical and Mathematical Modelling in Bioresources Management (MHRD), Thiagarajar College, Madurai 625 009, IN
3 Department of Plant Sciences, School of Biological Sciences, Madurai Kamaraj University, Madurai 625 021, IN
1 Department of Botany, National Centre of Excellence in Statistical and Mathematical Modelling in Bioresources Management (MHRD), Thiagarajar College, Madurai 625 009, IN
2 National Centre of Excellence in Statistical and Mathematical Modelling in Bioresources Management (MHRD), Thiagarajar College, Madurai 625 009, IN
3 Department of Plant Sciences, School of Biological Sciences, Madurai Kamaraj University, Madurai 625 021, IN
Source
Current Science, Vol 106, No 10 (2014), Pagination: 1401-1408Abstract
Kappaphycus alvarezii is a commercially important red alga being intentionally introduced in marine waters worldwide for the production of kappa carrageenan. Its introduction into the Gulf of Mannar Biosphere Reserve during the 1990s and its subsequent escape from cultivation sites have paved the way for its invasion into the coral reef ecosystem of Kurusadai Island. Since the report of its invasion in 2008, removal of K. alvarezii from the reefs has been started by means of manual removal (hand plucking). This article details the unsuccessful attempt and negative impact of the eradication programme. Regrowth of K. alvarezii from removal points and drifting broken fragments resulting during removal have led to further establishment in the reef environment. Variation in the morphology of K. alvarezii populations after their removal has been observed. A significant reduction in the cover of coral and native algae due to the increase in abundance of K. alvarezii was evident from the study. The need for immediate scientific control measures to eradicate the invasive alga is discussed.Keywords
Coral Reefs, Gulf of Mannar, Invasive Species, Kappaphycus alvarezii, Manual Removal.Full Text
- Response
Abstract Views :256 |
PDF Views:90
Authors
Affiliations
1 Department of Plant Sciences, School of Biological Sciences, Madurai Kamaraj University, Madurai 625 021, IN
1 Department of Plant Sciences, School of Biological Sciences, Madurai Kamaraj University, Madurai 625 021, IN
Source
Current Science, Vol 108, No 11 (2015), Pagination: 1974-1974Abstract
No Abstract.Full Text
- Graph Theoretical Modelling and Analysis of Fragile Honey Bee Pollination Network
Abstract Views :314 |
PDF Views:122
Authors
Affiliations
1 National Centre of Excellence, Statistical and Mathematical Modelling on Bioresources Management (MHRD), Thiagarajar College, Madurai 625 009, IN
2 Department of Plant Sciences, School of Biological Sciences, Madurai Kamaraj University, Madurai 625 021, IN
3 Department of Mathematics,Thiagarajar College, Madurai 625 009, IN
1 National Centre of Excellence, Statistical and Mathematical Modelling on Bioresources Management (MHRD), Thiagarajar College, Madurai 625 009, IN
2 Department of Plant Sciences, School of Biological Sciences, Madurai Kamaraj University, Madurai 625 021, IN
3 Department of Mathematics,Thiagarajar College, Madurai 625 009, IN
Source
Current Science, Vol 107, No 12 (2014), Pagination: 1988-1996Abstract
Due to environmental stress honey bees frequently make foraging shifts. Encounter with any nonflowering agent during such shifts leads to colony collapse. To assess the impact of non-flowering agents in the pollination network, we have modelled the pollination network as polligraphs using graph theoretical tools. Based on the outcome of the model we have extracted a few new network parameters and characterized the stability of the pollination network.Keywords
Honey Bees, Non-Flowering Agent, Polligraph, Pollination Network.Full Text
- Are National Level Conferences 'End of Season Sales'?
Abstract Views :331 |
PDF Views:83
Authors
Affiliations
1 Department of Plant Sciences, School of Biological Sciences, Madurai Kamaraj University, Madurai 625 021, IN
1 Department of Plant Sciences, School of Biological Sciences, Madurai Kamaraj University, Madurai 625 021, IN
Source
Current Science, Vol 110, No 7 (2016), Pagination: 1134-1135Abstract
If you are a researcher or a postgraduate student, then you are likely to see invitations hanging on the notice boards to participate in a conference/symposium/workshop throughout the year. This is also seasonal and reaches its peak post-winter. Originally and still we believe that these academic gatherings are organized to exchange research ideas and results on specific themes. Balaram had highlighted the role of conferences and meetings, seminars and symposia, congress and conventions on the development of science. He had also raised concerns about the proliferation of conferences without meaningful discussions.Full Text
- Influence of Flower Colour and Seasonality on Plant Invasion Success
Abstract Views :276 |
PDF Views:92
Authors
Affiliations
1 Department of Plant Sciences, School of Biological Sciences, Madurai Kamaraj University, Madurai 625 021, IN
2 Department of Biological Sciences, ASSEFA College of Education, Madurai 625 702, IN
1 Department of Plant Sciences, School of Biological Sciences, Madurai Kamaraj University, Madurai 625 021, IN
2 Department of Biological Sciences, ASSEFA College of Education, Madurai 625 702, IN
Source
Current Science, Vol 111, No 4 (2016), Pagination: 617-619Abstract
The ecological factors and mechanisms that determine the bioinvasion success of exotic plant species have become a cause celebre in current ecological research as witnessed by the many leading hypotheses and articles published. In pursuit of understanding invasive plants, while mining the Global Invasive Species Database, we found that a large number of invasive plants are characterized by flower colour polymorphism and multi-seasonal flowering. An effort has been made here to find out if these two traits have any role in invasiveness in plants.Full Text
- An Expedition from ‘Time-Pass Research’ to Innovative Research
Abstract Views :298 |
PDF Views:81
Authors
Affiliations
1 Department of Plant Sciences, School of Biological Sciences, Madurai Kamaraj University, Madurai 625 021, IN
1 Department of Plant Sciences, School of Biological Sciences, Madurai Kamaraj University, Madurai 625 021, IN
Source
Current Science, Vol 113, No 07 (2017), Pagination: 1222-1223Abstract
Human society is under severe threat from the problems triggered by natural as well as human-mediated activities. Providing solutions to these emerging problems by the conventional way of thinking is largely insufficient to meet these challenges. Therefore, innovative research is mandatory to efficiently tackle them. The problems faced by developing countries, particularly India, are different from those of the developed nations. At this juncture, it is highly expected from Indian researches to find suitable solutions through innovative research.Full Text
References
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- Chandrasekaran, S., Arun Nagendran, N., Krishnankutty, N., Pandiaraja, D., Saravanan, S., Kamaladhasan, N. and Kamalakannan, B., Curr. Sci., 2011, 101, 1262.
- John van Wyhe (ed.), The Complete Work of Charles Darwin Online, 1 August 2016; http://darwin-online.org.uk/ (accessed on 28 September 2017).
- Uma Shaanker, Curr. Sci., 2015, 109, 1549–1550.
- Sambasiva Swaminathan (1923–2020)
Abstract Views :211 |
PDF Views:74
Authors
Affiliations
1 Department of Organic Chemistry, Indian Institute of Science, Bengaluru 560 012, IN
2 #007, Block 1, Serene Urbana, Kannamangala, Bengaluru 562 110, IN
1 Department of Organic Chemistry, Indian Institute of Science, Bengaluru 560 012, IN
2 #007, Block 1, Serene Urbana, Kannamangala, Bengaluru 562 110, IN
Source
Current Science, Vol 118, No 6 (2020), Pagination: 992-993Abstract
Professor Sambasiva Swaminathan, known to many of us as Professor SS and ‘Sama’ to his close friends, one of the senior most and distinguished organic chemists of this country passed away on 24 February 2020 at the age of 97 at his residence in Chennai. It was only a week before (on 17 Feb), one of the authors and his former Ph D student (SCN) visited him and had long chat with him about his health. While he appeared cheerful at that time, it was clear that he was slowly sinking and the end came a week later. It is truly the end of an era.Full Text
- Hiriyakkanavar Junjappa (1936–2021)
Abstract Views :160 |
PDF Views:73
Authors
Affiliations
1 Department of Organic Chemistry, Indian Institute of Science, Bengaluru 560 012, India, IN
2 Department of Chemistry, Indian Institute of Science Education and Research, Pune 411 008, India, IN
1 Department of Organic Chemistry, Indian Institute of Science, Bengaluru 560 012, India, IN
2 Department of Chemistry, Indian Institute of Science Education and Research, Pune 411 008, India, IN
Source
Current Science, Vol 122, No 1 (2022), Pagination: 107-108Abstract
No Abstract.Keywords
No Keywords.Full Text