Uploaded August 2023 | Updated September 2026, 1 hour ago

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You can find all my A Level Biology videos fully indexed at freesciencelessons.co.uk/a-level-revision-videos/a-level-biology

In this video, we look at the aesthetic, economic and ecological reasons for maintaining biodiversity. We also look at what is meant by a keystone species and why they are important.

Image credits:

Wheat field
commons.wikimedia.org/wiki/File:Wheat_field_in_Worcestershire.jpg
InterstellarGamer12321, CC BY-SA 4.0 creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons

Logging
commons.wikimedia.org/wiki/File:Tawau-District_Sabah_Logging-Camp-10.jpg
Photo by CEphoto, Uwe Aranas

Melting ice
commons.wikimedia.org/wiki/File:Warming_Seas_and_Melting_Ice_Sheets_(20280818003).jpg
NASA Goddard Space Flight Center from Greenbelt, MD, USA, Public domain, via Wikimedia Commons

Bee
commons.wikimedia.org/wiki/File:Bee_Collecting_Pollen_2004-08-14.jpg
Jon Sullivan, Public domain, via Wikimedia Commons

Sunrise Ridge
commons.wikimedia.org/wiki/File:Sunrise_Ridge_(142983279).jpeg
Jason Knauer, CC BY 3.0 creativecommons.org/licenses/by/3.0, via Wikimedia Commons

Blue poison dart frog
commons.wikimedia.org/wiki/File:Dendrobates_azureus_(Dendrobates_tinctorius)_Edit.jpg
Michael Gäbler, CC BY 3.0 creativecommons.org/licenses/by/3.0, via Wikimedia Commons

Amazon rainforest
commons.wikimedia.org/wiki/File:Amazonian_rainforest.JPG
Shao, CC BY-SA 3.0 creativecommons.org/licenses/by-sa/3.0/, via Wikimedia Commons

Rainforest tourism
commons.wikimedia.org/wiki/File:Turistas_na_Amaz%C3%B4nia.jpg
Artur Warchavchik, CC BY-SA 3.0 creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons

Fertiliser
commons.wikimedia.org/wiki/File:Flexible_intermediate_bulk_containers-Fertilizer.jpg
Cjp24, CC BY-SA 3.0 creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons

Sea stars
commons.wikimedia.org/wiki/File:Ochre_sea_stars.jpg
D. Gordon E. Robertson, CC BY-SA 3.0 creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons

Mussels
commons.wikimedia.org/wiki/File:California_Mussels_002.jpg
Sharon Mollerus, CC BY 2.0 creativecommons.org/licenses/by/2.0, via Wikimedia Commons

Rabbit
commons.wikimedia.org/wiki/File:Early_morning_rabbit_(48391384206).jpg
Enoch Leung, CC BY-SA 2.0 creativecommons.org/licenses/by-sa/2.0, via Wikimedia Commons

Fungi
commons.wikimedia.org/wiki/File:Fungi_at_Springhead,_Shottermill_02.jpg
Simon Burchell, CC BY-SA 4.0 creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons