Senna spectabilis, an invasive tree species, was introduced to Wayanad Wildlife Sanctuary in the mid-1980s. Initially brought in for shade, it has since established itself extensively throughout the sanctuary over the past few decades.
The expansion of Senna spectabilis has led to significant ecological consequences in the Western and Eastern Ghats. This invasive species has proliferated across protected areas in three southern Indian states, resulting in a noticeable decline in native biodiversity.
To combat the spread of Senna, various management efforts are underway. These methods include cutting, debarking, and employing chemical treatments to control its growth and protect the native flora.
In 1986, the Kerala forest department made a crucial decision to plant Senna spectabilis saplings in the Wayanad Wildlife Sanctuary and along roads in the Muthanga and Tholpetty areas. At that time, the invasive nature of this species was not well understood, leading to its widespread establishment.
Senna spectabilis originates from tropical America and possesses a notorious reputation for colonizing various continents, including parts of Asia, Africa, and Australia. Its adaptability has made it a formidable invasive species.
The invasive spread of Senna in the Western and Eastern Ghats has had detrimental effects on native biodiversity. As it continues to thrive, indigenous species face increased competition and habitat loss, further threatening their survival.
Q1. How did Senna spectabilis enter Wayanad Wildlife Sanctuary?
Answer: Senna spectabilis was introduced to Wayanad for shade in the mid-1980s and has since established itself extensively within the sanctuary.
Q2. What are the consequences of Senna spectabilis spreading?
Answer: The spread of Senna spectabilis in the Western and Eastern Ghats has led to a decline in native biodiversity across protected areas in southern India.
Q3. How is the spread of Senna being managed?
Answer: Management strategies for Senna include cutting, debarking, and chemical treatments to control its growth and minimize ecological impact.
Q4. What decision did the Kerala forest department make regarding Senna spectabilis in 1986?
Answer: The Kerala forest department planted Senna spectabilis saplings in Wayanad in 1986 without recognizing its invasive potential, contributing to its spread.
Q5. What is the origin of Senna spectabilis?
Answer: Senna spectabilis originates from tropical America and is known for its ability to colonize various regions, including parts of Asia and Africa.
Question 1: What was the initial purpose of planting Senna spectabilis in Wayanad Wildlife Sanctuary?
A) Aesthetic purposes
B) Shade provision
C) Timber production
D) Soil improvement
Correct Answer: B
Question 2: In what year did the Kerala forest department plant Senna spectabilis saplings?
A) 1980
B) 1986
C) 1990
D) 1995
Correct Answer: B
Question 3: Which regions have experienced the spread of Senna spectabilis?
A) Western Ghats only
B) Eastern Ghats only
C) Both Western and Eastern Ghats
D) None of the above
Correct Answer: C
Question 4: What impact has Senna spectabilis had on native species?
A) Increased population of natives
B) Decline in native biodiversity
C) No impact
D) Improvement in native habitat
Correct Answer: B
Question 5: What methods are being used to manage the spread of Senna spectabilis?
A) Fertilization
B) Cutting and chemical treatments
C) Planting more natives
D) Irrigation
Correct Answer: B
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