define the terms ecosystem and niche

What is an Ecosystem? 🌱🏞️

An ecosystem is a community of living organisms (plants, animals, microbes) interacting with each other and with their non‑living environment (air, water, soil) in a specific area. Think of it as a city where every species is a resident, the food chain is the transportation system, and the climate is the weather.

• Biotic components: producers, consumers, decomposers
• Abiotic components: light, temperature, nutrients, water
• Energy flows from the sun to producers and then through the food web.

Example: A wetland ecosystem includes reeds, frogs, bacteria, and the water that keeps them alive.

What is a Niche? 🐝🦋

A niche is the role or job description of a species within its ecosystem. It includes:

1. Habitat – where it lives.
2. Diet – what it eats.
3. Behaviour – how it interacts with other species.
4. Time of activity – when it is active.

Analogy: In a city, a niche is like a person’s job – a teacher, a plumber, or a baker. Each job uses specific skills and resources.

Example: The honeybee has a niche as a pollinator, living in hives, feeding on nectar, and working during daylight.

Ecosystem vs. Niche – Quick Comparison

Exam Tips 📚

• Use the city analogy to explain ecosystems and niches quickly.
• Remember the four components of a niche – habitat, diet, behaviour, time.
• When asked to compare, list the differences in a table or bullet points.
• Include an example for each definition to show understanding.
• Use LaTeX for any energy flow equations: e.g., $$E_{\text{total}} = \sum_{i} E_i$$.