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How ecosystems hold together

Succession, keystones, edges and indicators — the principles that explain why the practical chapters work.

Ecology
  1. 01
    Young birch and scrub colonising an abandoned field with grassland in front
    Ecology4695 min

    Succession: Where Land Goes When You Leave It Alone

    Bare ground to woodland, why the tidy textbook sequence is wrong, and how to read which stage a site is in and where it is heading.

  2. 02
    A beaver dam holding back water and creating wetland behind it
    Ecology2515 min

    Keystone Species: When Removing One Thing Collapses the Rest

    Disproportionate influence relative to abundance — what the concept actually means, where it holds up, and where it gets overstated.

  3. 03
    A vertical cross-section through a mixed oak woodland showing ground flora, shrub layer, understory, and canopy
    Ecology4685 min

    Structural Diversity: Layers Equal Niches Equal Species

    Ground cover, shrubs, understory, canopy, emergents. Each vertical layer doubles the species count. Design for layers.

  4. 04
    A wavy hedgerow boundary between woodland and meadow with wildflowers in the transition zone
    Ecology1494 min

    Edge Effects: Where Two Habitats Meet

    Why the boundary between two habitats hosts more species than either alone, and how to design landscapes for more edge, not less.

  5. 05
    A ladybird larva feeding on aphids on the underside of a broad bean leaf
    Ecology3705 min

    Predator-Prey Balance: Build Habitat, Skip the Sprays

    How to attract ladybirds, lacewings, ground beetles, owls, and snakes so they do the pest control work that pesticides do badly.

  6. 06
    Lichens growing on tree bark in a clean-air woodland
    Ecology2263 min

    Indicator Species: Reading Ecosystem Health at a Glance

    How lichens, amphibians, dragonflies, and earthworms reveal the real condition of air, water, and soil on your site.

  7. 07
    A small herd of European bison grazing in a fragmented patch of forest
    Ecology2914 min

    Minimum Viable Populations: How Small Is Too Small

    Why isolated populations below a few hundred individuals slide toward extinction even when habitat looks fine, and how corridors and connectivity prevent it.

  8. 08
    A diverse native hedgerow with wildflowers and visiting insects
    Ecology3114 min

    Native Over Exotic: Why Local Species Matter

    How native plants anchor local food webs, why genetic provenance shapes restoration outcomes, and where the native-exotic line gets blurry.