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Kamaladhasan, N.

On-Line Trade of Aesthetic Exotic Organisms: Sword of Damocles?

Abstract Views :283 | PDF Views:120

Authors

N. Soundararajan ¹, R. Mohan Raj ¹, N. Kamaladhasan ¹, R. Indhar Saidanyan ¹, S. Chandrasekaran ¹

Affiliations
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: 1404-1410

Abstract

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.

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References

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Studies on the Maintenance of 'Self-Sustained' Mosquito Vector Population in Vaigai River, South India

Abstract Views :462 | PDF Views:93

Authors

N. Kamaladhasan ¹, B. K. Tyagi ², P. S. Swamy ¹, S. Chandrasekaran ¹

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

Source

Current Science, Vol 110, No 1 (2016), Pagination: 57-68

Abstract

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.

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Current Science

Author Details

Kamaladhasan, N.

On-Line Trade of Aesthetic Exotic Organisms: Sword of Damocles?

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Abstract

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References

Studies on the Maintenance of 'Self-Sustained' Mosquito Vector Population in Vaigai River, South India

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Abstract

Keywords

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References

Impact of Prosopis juliflora on Nesting Success of Breeding Wetland Birds at Vettangudi Bird Sanctuary, South India

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Influence of Flower Colour and Seasonality on Plant Invasion Success

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