Question

An ornamental shrub species was brought from Japan in the early 1800s to India, where it was planted frequently in gardens and parks. The species persisted for many decades without spreading and then began to spread invasively fifty years ago. Which one or more of the following processes could have led to it becoming invasive?

• A. Evolutionary adaptation to the environment
• B. Open niches due to recent habitat degradation
• C. Climate change
• D. Recent introduction of a specialized herbivore of this shrub species

Hint:

To understand invasiveness: 1. Invasiveness can arise from ecological or evolutionary changes over time.
2. Factors such as habitat degradation, climate change, and open niches often favor invasive species.
3. Introduction of herbivores typically suppresses plant populations rather than promotes invasiveness.

Answer 1

The Correct Option is A, B, C

Step 1: Analyze potential factors contributing to invasiveness. Invasive species often spread due to environmental changes, evolutionary adaptations, or ecological opportunities that favor their proliferation. Over decades, one or more of these factors could trigger their invasive behavior. Step 2: Evaluate the options. Option (A): Correct. Evolutionary adaptation to the local environment could have enabled the shrub to thrive and outcompete native species, leading to its invasive spread. Option (B): Correct. Habitat degradation could have created open niches by reducing native species populations, providing the shrub with opportunities to spread. Option (C): Correct. Climate change could have altered environmental conditions to favor the growth and spread of the shrub species. Option (D): Incorrect. The introduction of a specialized herbivore would likely reduce the shrub population rather than promote its spread, as herbivores generally suppress plant growth.