Syllabus Edition

First teaching 2023

First exams 2025

|

Restoring Ecosystems (SL IB Biology)

Revision Note

Naomi H

Author

Naomi H

Last updated

Restoring Ecosystems

  • Human activities, such as deforestation and overharvesting of resources, can destabilise ecosystems
  • Conservation efforts at the ecosystem level aim to improve ecosystem stability by restoring natural ecosystem processes
    • This type of ecosystem restoration project is sometimes known as rewilding
  • Restoration strategies may involve
    • Species reintroductions
      • Reintroduction of apex predators will control populations of herbivores and allow the restoration of habitat vegetation; this can increase the diversity of plant species, which will in turn boost overall biodiversity
      • Reintroduction of keystone species can alter the structure of an ecosystem
    • Improving habitat connectivity
      • The establishment of wildlife corridors, e.g. by planting hedgerows throughout farmland, can connect small pockets of habitat
      • When habitats are connected organisms can roam over larger areas; this gives access to more resources and allows populations to increase in size
    • Limiting human influence
      • This may involve preventing the harvesting of resources by, e.g. logging, fishing, or agriculture
      • Ecological management techniques, e.g. controlled grazing or burning, may be used to restore a habitat

Restoration of Hinewai Reserve, New Zealand

  • Hinewai Reserve was once farmland, but is now privately owned, with the aim of restoring the natural ecosystem of the area
  • Some initial human intervention was involved, with the removal of non-native species, but the area is now managed with minimal human intervention to allow native communities to be restored by succession
  • Human activities are limited in the area, though the public can enjoy walking in the Reserve 
hinewai-reserve-rewilding-photo

 CC BY-SA 4.0, via Wikimedia Commons

Hinewai Reserve in New Zealand is considered to be a an example of successful rewilding

You've read 0 of your 5 free revision notes this week

Sign up now. It’s free!

Join the 100,000+ Students that ❤️ Save My Exams

the (exam) results speak for themselves:

Did this page help you?

Naomi H

Author: Naomi H

Expertise: Biology

Naomi graduated from the University of Oxford with a degree in Biological Sciences. She has 8 years of classroom experience teaching Key Stage 3 up to A-Level biology, and is currently a tutor and A-Level examiner. Naomi especially enjoys creating resources that enable students to build a solid understanding of subject content, while also connecting their knowledge with biology’s exciting, real-world applications.