Unwanted guests turn sweet hosts for Assam butterflies, Pg11

Key Highlights:

• A recent study in Raimona National Park, Assam, revealed that certain invasive plant species, typically considered harmful, serve as crucial nectar and larval host sources for butterflies.
• The research, conducted between 2022 and 2025, documented 220 butterfly species, 56 larval host plants, and 41 nectar plants within the 422 sq. km park.
• Lantana camara, Chromolaena odorata, and Ziziphus mauritiana, known as aggressive invasive species, were identified as major nectar sources, particularly when native wildflowers are scarce.
• Lantana camara alone attracted over 30 butterfly species, while Chromolaena odorata supported 24 species during different seasons.
• Researchers recommend maintaining small, managed patches of these invasive plants in protected areas to support butterfly populations.

Detailed Insights:

• Raimona National Park, established in 2021, is located in the Bodoland Territorial Region of Assam and forms a transboundary conservation landscape with Bhutan's Phibsoo Wildlife Sanctuary.
• The park is a significant habitat for diverse flora and fauna, including the endangered Golden Langur.
• Invasive species like Lantana camara and Chromolaena odorata are globally recognized for their negative impacts on native vegetation and ecosystem functioning, often outcompeting indigenous plants.
• Ziziphus mauritiana, also known as Indian Jujube, is another invasive species that can form dense thickets and alter rangeland ecosystems.
• The study highlights a complex ecological interaction where these invasive plants, despite their overall detrimental effects, provide essential nutritional resources for adult butterflies and food for their larvae.
• Their prolonged flowering periods and high nectar availability offer a continuous food supply, sustaining butterfly populations during lean seasons.
• This finding suggests a nuanced approach to invasive species management, where complete eradication might not always be beneficial for all native biodiversity components.

Key Concepts Involved:

• Invasive Alien Species (IAS): Non-native organisms introduced outside their natural range that threaten biodiversity, ecosystem services, or human well-being.
• Nectar plants: Plants that produce a sugary liquid called nectar, primarily to attract pollinators like butterflies, bees, and birds.
• Larval host plants: Specific plant species on which butterflies and moths lay their eggs, and whose foliage serves as the primary food source for their developing larvae (caterpillars).
• Biodiversity Conservation: The protection, preservation, and management of ecosystems and natural habitats, and the maintenance and recovery of viable populations of species in their natural surroundings.