All UK Exam Boards included


Populations and Ecosystems

This is a legacy topic. View the most up to date content by selecting the exam board in the dropdown to the left.

What is a population? A population is all the individual organisms found in a given habitat, of one species. So you could talk about a population of wolves in the woods. If you want to talk about the wolves and rabbits in the woods, then you’d be referring to a community. A community is made up of the various populations in a habitat. So the summation of all the living things in a given area is called a community. What then is an ecosystem?

An ecosystem comprises the community of living organisms in a habitat, together with all the non-living components such as water, soil, temperature, etc. called abiotic factors.

Why are different organisms of different species able to coexist in the same habitat? How come they don’t directly compete with one another and drive others out? Have a watch…

So that’s the last and loveliest new term: niche. It rhymes with quiche. A niche is the interaction, or way of life, of a species, population or individual in relation to all others within an ecosystem. It’s how it behaves, what it eats, how it reproduces, where it sleeps, etc.; a species’ niche is determined by both biotic factors (such as competition and predation) and abiotic factors.





Off-Spec Bonus Topics
Filter by
Post Page
Sort by

Sorry! There are no posts.

Sorry! There are no posts.

Our Reviews

Thank you for making all the content btw!

Serena Kutty YouTube

You explain everything so simply! 

SecretDuck The Student Room

Hi! I have recently finished my first year doing biology at uni and I subscribed to you back when I was doing AQA A levels (glad I don’t live in Wales after watching this vid lol) and you and your website helped me so much. Just wanted to say it’s so nice to see you

Mr Peanutbutter YouTube

OFF TOPIC : I just want to say that your website is brilliant, thank you!!

Anonymous YouTube

I got A* in A-level biology (Cambridge), thanks! I love your videos

Sherif Negm Facebook