Why shape of habitat matters more than we thought

When habitats shrink and fragment, ecologists typically measure survival using shape metrics—how elongated or compact a patch is. Using mathematical models of population growth and movement, researchers compared these geometric measures against a mechanistic approach that tracks how populations actually behave near extinction. Geometry consistently overestimated how long species could persist; the mechanistic model showed extinction approaching much faster and accelerating as degradation worsens. This gap matters because conservation strategies built on simple shape measurements may dangerously underestimate how quickly species vanish.