Swallowtail butterflies in key Assam habitat face a citrus worry

Overview

Swallowtail butterflies, renowned for their vibrant colors and unique patterns, are crucial components of biodiversity, acting as indicators of environmental health. This report highlights the ongoing challenges facing these butterflies in the Bodoland Territorial Region of Assam, particularly within the context of their dependence on specific host plants, many of which are under threat due to human activities.

Key Findings of the Study

1.     Diversity and Distribution:

o   India is home to 77 species of swallowtail butterflies out of a global total of 573 species.

o   The northeastern region of India, particularly Assam, has been designated as a "swallowtail-rich zone" due to the presence of 69 species.

2.     Threats to Swallowtail Butterflies:

o   Overexploitation of Host Plants: The study identifies that 25 species of host plants valued for their medicinal properties are being excessively harvested, which directly threatens the butterfly populations dependent on these plants.

o   Illegal Activities: Factors such as illegal cattle farming, tea cultivation, illegal tree felling, and the use of pesticides have been cited as significant contributors to the decline of swallowtail butterfly populations.

o   Environmental Changes: The encroachment of agricultural practices into natural habitats and the reduction of forest areas have exacerbated the decline of essential host plants for these butterflies.

3.     Specific Findings on Host Plants:

o   The Bodoland region supports 52 varieties of 17 citrus species, essential for the larvae of swallowtail butterflies.

o   The decline of wild citrus populations is linked to the diminishing swallowtail butterfly population, as these butterflies depend on citrus plants during their larval stage.

o   The study noted a concerning absence of two rare swallowtail species, Bhutan glory and Kaiser-i-Hind, indicating a significant impact of habitat loss and plant overexploitation.

4.     Ecological Importance of Swallowtail Butterflies:

o   Butterflies serve as indicators of environmental health, meaning their presence reflects the overall state of their habitat. A decline in their population signals potential ecological issues that may affect other species, including plants and other insects.

o   The lack of host plants undermines the butterflies' reproductive success and sustenance, potentially leading to a cascade of ecological consequences.

Importance of Conservation Efforts

1.     Biodiversity Preservation: Protecting swallowtail butterflies contributes to the preservation of biodiversity within the ecosystem. Their presence indicates a healthy environment, which supports a variety of other species.

2.     Ecological Balance: As part of the food chain, butterflies play a crucial role in pollination and nutrient cycling. Their decline could disrupt ecological balances.

3.     Cultural and Economic Value: Butterflies are not only important ecologically but also hold cultural significance in many regions. They attract ecotourism, which can provide economic benefits to local communities.

4.     Focus on Sustainable Practices: Emphasizing sustainable agricultural and forestry practices can help mitigate the impacts of overexploitation and habitat destruction. Encouraging local communities to protect and manage natural resources sustainably can lead to a healthier ecosystem.

Conclusion

The study underscores the urgent need for conservation initiatives aimed at protecting swallowtail butterflies and their habitats in Assam. This includes enforcing legal protections for host plants, promoting sustainable agricultural practices, and increasing awareness about the ecological roles of these butterflies. The integration of conservation efforts with local community engagement will be vital to ensuring the long-term survival of these beautiful and ecologically significant species.

MCQs

1.     Which of the following statements about swallowtail butterflies in India is correct?

o   A) India is home to 573 species of swallowtail butterflies.

o   B) The northeastern region of India is designated as a "swallowtail-rich zone."

o   C) Swallowtail butterflies are only found in the Bodoland Territorial Region.

o   D) The population of swallowtail butterflies has increased significantly in the last two decades.

Answer: B) The northeastern region of India is designated as a "swallowtail-rich zone."

2.     What is the primary threat to swallowtail butterflies in the Bodoland Territorial Region as identified in the study?

o   A) Climate change

o   B) Habitat destruction due to urbanization

o   C) Overexploitation of host plants valued for medicinal properties

o   D) Predation by other species

Answer: C) Overexploitation of host plants valued for medicinal properties

3.     Which of the following plants is mentioned as a crucial food source for swallowtail butterfly larvae in the study?

o   A) Ligustrum cordatum

o   B) Tulsi (Holy Basil)

o   C) Mint

o   D) Ginger

Answer: A) Ligustrum cordatum

4.     According to the article, why are certain citrus species declining in the wild?

o   A) They are becoming invasive species.

o   B) They are primarily cultivated in home gardens and backyard settings.

o   C) They are not suitable for the local climate.

o   D) They have been replaced by other crops.

Answer: B) They are primarily cultivated in home gardens and backyard settings.

5.     What role do butterflies play in their ecosystems as indicated in the study?

o   A) They primarily serve as food for birds.

o   B) They are indicators of environmental health.

o   C) They are the main pollinators of all flowering plants.

o   D) They contribute to soil fertility through their droppings.

Answer: B) They are indicators of environmental health.