Uploaded August 2023 | Updated September 2026, 8 hours 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 how to calculate biodiversity using Simpson's Index of Diversity. We also look at why having a rich biodiversity is important for an ecosystem.

Image Credits:

Woodlands
commons.wikimedia.org/wiki/File:Woodland_Bluebells.jpg
Prosthetic Head, CC BY-SA 4.0 creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons

Chile desert
commons.wikimedia.org/wiki/File:Wallpaper_of_E-ELT_site_testing_%E2%80%94_Cerro_Armazones_Chile.jpg
ESO/S. Brunier, CC BY 4.0 creativecommons.org/licenses/by/4.0, via Wikimedia Commons

Badger
commons.wikimedia.org/wiki/File:Grevling_(Meles_meles).jpg
Trond Sætre Stegarud, CC BY-SA 4.0 creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons

Earthworm
commons.wikimedia.org/wiki/File:Lumbricus_terrestris_R.H_(2).JPG
Rob Hille, CC BY-SA 3.0 creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons

Slug
commons.wikimedia.org/wiki/File:Slug_ed.jpg
RodrigoQuarteu, CC BY-SA 4.0 creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons

Elderberry
commons.wikimedia.org/wiki/File:Sambucus-berries.jpg
Edal Anton Lefterov, CC BY-SA 3.0 creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons

Rabbit
commons.wikimedia.org/wiki/File:Oryctolagus_cuniculus_Rcdo.jpg
JM Ligero Loarte, CC BY 3.0 creativecommons.org/licenses/by/3.0, via Wikimedia Commons

Bank vole
commons.wikimedia.org/wiki/File:Myodes_Glareolus_(123190659).jpeg
Jurikowski, CC BY-SA 3.0 creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons

Hedgehog
commons.wikimedia.org/wiki/File:West_European_Hedgehog_(Erinaceus_europaeus)1.jpg
Hrald, CC BY-SA 3.0 creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons

Melolontha melolontha
commons.wikimedia.org/wiki/File:Melolontha_melolontha_(41751778121).jpg
Björn S..., CC BY-SA 2.0 creativecommons.org/licenses/by-sa/2.0, via Wikimedia Commons

Common frog
commons.wikimedia.org/wiki/File:The_common_frog_-_geograph.org.uk_-_5004730.jpg
The common frog by valenta, CC BY-SA 2.0 creativecommons.org/licenses/by-sa/2.0, via Wikimedia Commons

Shrew
commons.wikimedia.org/wiki/File:A_Shrew_-_geograph.org.uk_-_202061.jpg
Donald Bain / A Shrew

Acorn
commons.wikimedia.org/wiki/File:Acorn_(2881856339).jpg
Randi Hausken from Bærum, Norway, CC BY-SA 2.0 creativecommons.org/licenses/by-sa/2.0, via Wikimedia Commons

Vicugna vicugna
commons.wikimedia.org/wiki/File:Vicugna_vicugna_at_about_4,000m,_near_the_Chajnantor_Plateau,_NW_Chile._Simon_Green_17th_April_2018.jpg
Papermaker, CC BY-SA 4.0 creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons

Wheatfield
commons.wikimedia.org/wiki/File:Wheat_field_-_geograph.org.uk_-_3610288.jpg
Wheat field by Richard Webb, CC BY-SA 2.0 creativecommons.org/licenses/by-sa/2.0, via Wikimedia Commons

Red-tailed maggot
commons.wikimedia.org/wiki/File:Australian_Rat-tailed_fly_larva.jpg
Bipedia at English Wikipedia, CC BY 3.0 creativecommons.org/licenses/by/3.0, via Wikimedia Commons

Water Louse
commons.wikimedia.org/wiki/File:Waterlouse_(Asellus_aquaticus).jpg
Charles J. Sharp, CC BY-SA 4.0 creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons

Blood worms
commons.wikimedia.org/wiki/File:Madge_fly_blood_worms,_harvested_by_locals,_confluence_of_Ram_Mula_rivers,_Aundh-Baner_link_road,_Pune.jpg
RTmhasvai, CC BY-SA 4.0 creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons