Answer:
Step-by-step explanation:
There are various species that can play a significant role in an ecosystem despite having a relatively small population. Here are a few examples:
Keystone species: These are species that have a disproportionately large impact on their environment relative to their abundance. Their presence or absence can significantly influence the structure and functioning of an ecosystem. For example, the sea otter in kelp forest ecosystems is a keystone species that helps maintain the balance by preying on sea urchins, which if left unchecked, can overgraze kelp forests and cause ecosystem degradation.
Pollinators: Bees, butterflies, birds, and other pollinators are essential for the pollination of flowering plants, which in turn contributes to the reproduction and survival of many plant species. Despite their relatively small population sizes, their role in pollination is critical for maintaining ecosystem health and supporting food production.
Decomposers: Species such as fungi, bacteria, and detritivores like earthworms and dung beetles play a vital role in breaking down organic matter and recycling nutrients in ecosystems. Although their populations may not be large, they have a significant impact on nutrient cycling and the overall health of the ecosystem.
Indicator species: Certain species are considered indicators of ecosystem health. Their population size or presence can provide valuable information about the condition of their habitat or ecosystem. For instance, amphibians like frogs and salamanders are often used as indicators of environmental quality due to their sensitivity to changes in water and air quality.
These are just a few examples, and the specific species that play significant roles in ecosystems can vary depending on the ecosystem type and location. The key point is that population size alone does not necessarily determine the importance of a species within an ecosystem.