Animals and plants that are unintentionally or purposefully brought into a natural setting where they are not typically present and have severe negative effects on their new ecosystem are referred to as invasive alien species (IAS). They pose a serious threat to local wildlife and flora, resulting in yearly losses of millions of dollars. Since invasive alien species do not respect national boundaries, coordinated international action will be more effective than individual Member State actions. This article will explain to you the Invasive Alien Species which will be helpful in preparing the Environment Syllabus for the UPSC Civil Service exam.

Common Invasive Alien Species

• African apple snail (Achatina Fulica): The Andaman and Nicobar Islands is where the African apple snail (Achatina Fulica), the most invasive species of foreign wildlife in India, was originally discovered. It is now widespread across the nation and endangers the habitat of a number of indigenous species.
• Papaya Mealy Bug (Paracoccus marginatus): It is believed that the papaya mealybug (Paracoccus marginatus), a native of Mexico and Central America, damaged significant papaya crops in Assam, West Bengal, and Tamil Nadu.
• Cotton Mealy Bug (Phenacoccus Solenopsis): Native to North America, the cotton mealybug (Phenacoccus Solenopsis) has had a significant negative impact on Deccan cotton production.
• Amazon sailfin catfish (Pterygoplichthys pardalis): The fish population in Kolkata's wetlands have been decimated by the Amazon sailfin catfish (Pterygoplichthys pardalis).

How are Invasive Alien Species Introduced?

• Exotic species move around the globe in the most surprising ways, establishing themselves in locations thousands of kilometers from their original homes.
• Sometimes this is the result of purposeful or unintentional human activity, and other times it is brought on by a natural phenomenon.

Some of the human-related factors are discussed below:

• Wildlife Trade: The primary factor is the trade in exotic plants and animals. According to the Worldwide Fund for Nature, the illegal trade in wildlife generates between 10 and 20 billion euros annually (WWF).
• Tourism: Whether on purpose or not, traveling to other nations aids in the spread of invasive alien species.
• Hunting and Fishing: In the past, these two actions were responsible for the introduction of several animals throughout a significant portion of Europe, including the barbary sheep and the catfish.
• Transport and International Trade: Invasive species frequently travel undetected in ship hulls, cargo holds, and aircraft.
• Abandoned Pets: A few instances of exotic pets that have colonized ecosystems after escaping or being abandoned are raccoons, monk parakeets, and red-eared slider turtles.
• Crops and Fur Industry: Additionally, the horticulture and clothing industries have served as entryways for animals like the American mink in Europe and for plants like the upright prickly pear in Africa and Oceania.

Invasive Alien Species - Characteristic Features

• Invading species have distinctive features like "pioneer species" in a variety of environments.
• They can withstand a variety of soil types and climatic conditions.
• They have a wide geographic range, abundant, easily dispersed seed production, robust root growth, and quick generation times.
• They are widely distributed in their native habitat, have long flowering and fruiting seasons, and have strong rates of dissemination.
• According to early findings from one fascinating study, invasive species are expected to have relatively little DNA in their cell nuclei.
• Evidently, compared to species with larger cellular DNA contents, these plants' cells are able to divide and proliferate more quickly, which allows the overall plant to expand more swiftly. In disturbed environments, they benefit from having this.

Invasion & Species Richness

• As invading species are added to the current species pool, the invasions may result in an increase in species richness.
• However, it also causes native species to go extinct, reducing the diversity of species.
• The competition with natives for food and nourishment, which can prevent coexistence, and predation are the main unfavorable interactions.

Invasive Alien Species and Climate Change

• IAS are a major cause of biodiversity loss and species extinctions, as well as a global threat to food security.
• Climate change promotes the spread and establishment of many alien species while also providing new opportunities for them to become invasive.
• IAS can make natural habitats, agricultural systems, and urban areas less resilient to climate change. Climate change, on the other hand, reduces the resilience of habitats to biological invasions.
• It is critical that IAS be included in climate change policies. This includes biosecurity measures to prevent the spread of IAS to new areas as a result of climate change, as well as rapid response measures to monitor and eradicate alien species that may become invasive as a result of climate change.
• Extreme climatic events caused by climate change, such as hurricanes, floods, and droughts, can transport IAS to new areas and reduce habitat resistance to invasions.
• Climate change is also creating new avenues for the introduction of IAS. For example, new Arctic shipping routes created by melting ice caps will significantly reduce the time it takes ships to travel from Asia to Europe. This increases the likelihood of alien species surviving the journey.
• Many IAS are capable of rapidly expanding to higher latitudes and altitudes as the climate warms, outpacing native species.
• Alien species that have been introduced by humans but have so far failed to establish themselves may succeed as a result of climate change, resulting in new invaders.
• Some habitats, such as temperate forests and freshwater systems, will become more suitable for alien species as the climate changes.

Invasive Alien Species - Harmful Effects

Ecological

• By out-competing indigenous species for resources, IAS can directly alter the community structure and species composition of native ecosystems.
• IAS may also have significant indirect effects on nutrient cycling, ecosystem function, and ecological relationships among native species.
• When one species affects another via an intermediate species, a shared natural enemy, or a shared resource, IAS can cause cascading effects. These chain reactions can be challenging to detect and predict.
• Furthermore, the combined effects of multiple invasive species in an ecosystem can have large and complex consequences.
• One of the top five causes of biodiversity loss worldwide, biotic invasion is on the rise as a result of tourism and globalization.
• Through competitive exclusion, niche displacement, or hybridization with closely related native species, invasive species may drive local native species to extinction.
• Alien invasions may have significant effects on the structure, composition, and worldwide distribution of the biota at the places of introduction in addition to their economic effects.
• This could eventually result in the homogenization of the world's wildlife and plants and the extinction of biodiversity.

Environmental

• IAS can have a direct impact on human health. Infectious diseases are frequently IAS imported by travelers or vectored by exotic bird, rodent, and insect species.
• IAS also has indirect health effects on humans because pesticides and herbicides infiltrate water and soil.
• Public health effects from invasive species and related control measures may last for a while.
• For instance, insecticides used to control a specific pest species may contaminate the soil and nearby surface waters.
• Human encroachment into formerly inaccessible environments has made the general public more aware of rare diseases like HIV.
• Introduced species of birds, rodents, and insects, such as mosquitoes, fleas, louse pests, and tsetse flies, can act as carriers and reservoirs for human illnesses.
• These vectors have been used to spread outbreaks of human diseases throughout recorded history, including typhus, yellow fever, malaria, and bubonic plague.
• The spread of the West Nile virus, which killed humans, birds, animals, and reptiles, is an example of an invasive disease.
• Ballast water is frequently used for the transportation of agents that cause damaging algal blooms and waterborne diseases like cholera bacteria (Vibrio cholerae).

Economical

• An annual cost of 1.4 trillion dollars is incurred worldwide to manage and eradicate invasive species.
• Some invaders may have a negative impact on the local economy.
• Early discovery and quick action are frequently cited as being essential to decrease the expenses associated with invasive species harm and management.
• This indicates that maintaining the invasive population when it is widespread and already causing harm is less expensive than incurring the initial expense of looking for and detecting an invasive species and immediately controlling it when the number is tiny.
• To cut costs, an aggressive search for the invader is only necessary when the invasive species is not often reintroduced into the managed region and is easy to find.

Invasive Species in India

• The World Conservation Monitoring Centre (WCMC) estimates that 1,604,000 species have been documented globally.
• As a result, India is responsible for 8% of the world's biodiversity, which covers only 2.4% of its land area.
• 4900 out of 15000 flowering plant species, or 33 percent, are said to be endemic to the current political boundaries of this country.
• India is a significant hub for agri-biodiversity, having contributed 167 species to global agriculture and serving as the native habitat for 320 species of wild crop relatives.
• The 173 species of invasive alien plants in India are the subject of the current investigation.
• The most harmful invasive species, such as Alternanthera philoxeroides, Cassia uniflora, Chromolaena odorata, Eichhornia crassipes, Lantana camara, Parthenium hysterophorus, Prosopis juliflora, and others, are included in this group.

Invasive Alien Species - Law in India

• India is attempting to combat invasive alien species for the first time through legislation.
• The Wildlife Protection Act of 1972 was updated in 2021 with a new amendment that addresses invasive alien species.
• The Wildlife Protection Act's reach is expanded by the bill's introduction of "Alien Invasive Species."
• The Central Government has the authority to control or outlaw the import, trade, possession, or spread of invasive alien species that endanger India's wildlife or habitat under Section 62A(i).
• According to the Bill, "invasive alien species" refers to any animal or plant species that is not indigenous to India and whose introduction or expansion may endanger or negatively affect wildlife or its environment;"

Conclusion

The fact that India will finally take legal action against invasive alien species is a good start. To remove or manage invasive alien species, scientific management mechanisms must first be developed, and then the Wildlife Protection Act's definition of invasive alien species must be improved. Administrations in certain states have tried to combat invasive alien species by making products from them. However, given the nature of invasive alien species, they must be dealt with nationwide rather than in isolation. Invasive alien species removal is both a scientific and administrative problem, yet it may be handled delicately while also generating jobs.

FAQs

MCQs

1. What defines an invasive alien species?

A) A native species
B) A species that is extinct
C) A non-native species that causes harm
D) A domesticated species

2. Which of the following is an example of an invasive plant species?

A) Oak tree
B) Kudzu
C) Maple tree
D) Pine tree

3. What is a common consequence of invasive species on native ecosystems?

A) Enhanced biodiversity
B) Increased habitat
C) Decline of native species
D) Decreased competition

4. Which of the following strategies is used to manage invasive species?

A) Importing more invasive species
B) Restoration of native habitats
C) Ignoring their presence
D) Encouraging their spread

5. How can individuals contribute to combating invasive species?

A) Planting invasive species
B) Ignoring their presence
C) Reporting sightings and participating in clean-up efforts
D) Promoting invasive species

GS Mains Questions and Model Answers

Q1: Discuss the ecological and economic impacts of invasive alien species in ecosystems.

Answer: Invasive alien species can significantly impact both ecosystems and economies. Ecologically, they disrupt local biodiversity by outcompeting native species for resources such as light, water, and nutrients, leading to declines or extinctions of native flora and fauna. This disruption can alter habitat structures, affecting entire food webs and ecosystem functions. Economically, invasive species can lead to increased management costs for agriculture, forestry, and fisheries, as they may damage crops, outcompete economically important species, or require costly control measures. Additionally, tourism can be negatively affected in regions where invasive species diminish the natural beauty or health of landscapes. The cumulative impact of invasive species necessitates comprehensive management strategies to mitigate their effects on both ecological integrity and economic viability.

Q2: Analyze the effectiveness of current strategies for managing invasive alien species.

Answer: Current strategies for managing invasive alien species include prevention, early detection, and control measures. Prevention is the most effective strategy, focusing on regulating the importation and movement of species known to be invasive. Early detection and rapid response protocols allow for swift action against newly identified invasive species, potentially reducing their establishment and spread. Control methods, including biological, mechanical, and chemical approaches, aim to reduce invasive populations. However, the effectiveness of these strategies often varies based on species, ecological context, and available resources. Public awareness and community engagement play a crucial role in the success of management efforts, as local stakeholders are essential in monitoring and reporting invasive species. Overall, while current strategies show promise, ongoing research and adaptive management are necessary to enhance effectiveness and address emerging challenges in invasive species management.

Q3: Evaluate the role of public awareness and community participation in combating invasive species.

Answer: Public awareness and community participation are vital in combating invasive species. Educating the public about the identification, impacts, and prevention of invasive species fosters a proactive approach to management. Communities that understand the risks posed by invasives are more likely to engage in monitoring and reporting sightings, which is essential for early detection and control efforts. Additionally, community involvement in local clean-up and restoration initiatives can directly reduce the spread of invasive species and promote the recovery of native habitats. Collaborative efforts between governmental agencies, non-profit organizations, and local communities enhance resource sharing and create comprehensive management plans. Ultimately, empowering individuals and communities to take action against invasive species is crucial for sustaining biodiversity and protecting ecosystems.

Previous Year Questions on Invasive Alien Species

1. UPSC CSE Prelims 2021:

Question: Which of the following is a characteristic of invasive alien species?

A) Native to the ecosystem
B) Does not cause ecological disruption
C) Outcompetes native species for resources
D) Has natural predators in the new environment

Answer: (C)

Explanation: Invasive alien species often outcompete native species for resources, leading to ecological disruption.

2. UPSC CSE Mains 2019 (GS Paper 3):

Question: "Discuss the challenges posed by invasive alien species to biodiversity and ecosystem services." Evaluate strategies for effective management.

Answer: Invasive alien species pose significant challenges to biodiversity and ecosystem services by disrupting local flora and fauna, leading to declines in native species populations and altering habitat dynamics. These invasives can outcompete native species for nutrients and space, disrupt food webs, and cause economic losses in agriculture and fisheries. Effective management strategies include prevention through regulation, early detection and rapid response to new invasions, and public education to promote awareness and participation in monitoring efforts. Restoration of native ecosystems is also crucial following the removal of invasive species. Collaborative approaches involving government, non-profit organizations, and communities are essential for implementing successful management plans that protect biodiversity and maintain ecosystem services.