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There is a growing administrative and judicial push in India to identify, map, and eradicate Invasive Alien Species (IAS). The article questions this approach, suggesting that in a changing environment, demonizing these species might be counterproductive. The issue has moved from a scientific niche to a major public concern, often linked to human-wildlife conflict and ecological loss.
Invasive Alien Species (IAS) are plants, animals, pathogens, or other organisms that are non-native to an ecosystem, and which may cause economic or environmental harm or adversely affect human health. Common examples in India include Lantana camara, Prosopis juliflora, and Parthenium hysterophorus. From a UPSC perspective, understanding the impact of IAS is crucial. They often possess traits like rapid reproduction, high dispersal ability, and phenotypic plasticity, allowing them to outcompete native species for resources. This can lead to a decline in biodiversity, alter ecosystem processes (like nutrient cycling and fire regimes), and cause significant economic losses in agriculture and forestry. The Convention on Biological Diversity (CBD) recognizes IAS as a major threat. However, the article hints at an evolving ecological view: as climate change alters habitats, some species currently deemed invasive might actually be adapting better to the new conditions, challenging the traditional restoration ecology paradigm that prioritizes historical baselines.
The governance of IAS in India lacks a singular, comprehensive legislative framework. Various acts touch upon it, such as the Wildlife (Protection) Act, 1972 (amended in 2022 to include provisions for regulating invasive species) and the Environment (Protection) Act, 1986. The National Biodiversity Authority (NBA) plays a role under the Biological Diversity Act, 2002. The article highlights that state eradication drives are gaining administrative and judicial backing. For UPSC, this raises questions about policy design and execution. Eradication campaigns are often resource-intensive and can sometimes be ecologically damaging if not scientifically managed. The challenge for governance is moving from reactionary, ad-hoc eradication drives to a proactive strategy involving early detection, rapid response (EDRR), and long-term management strategies that are grounded in robust ecological science rather than just public perception.
India's diverse geography—from the Himalayas to the Western Ghats and arid zones—makes it highly susceptible to different types of IAS. For instance, Lantana camara is widespread across central and southern Indian forests, while Prosopis juliflora has heavily impacted arid and semi-arid regions like Rajasthan and Gujarat, altering the local hydrology and soil composition. The spread of IAS is often facilitated by human activities, trade, and transportation networks. From a geographical lens, UPSC candidates should understand how IAS alter land use and land cover (LULC). Furthermore, as climate change causes shifts in temperature and precipitation patterns, the geographical range of native species might shrink while that of certain IAS might expand, forcing a re-evaluation of conservation geography. The changing subcontinent mentioned in the article refers to these dynamic environmental shifts.