Following the Butterflies - and what they tell us about Protected Areas

Across almost every ecosystem, global biodiversity is declining at a frighteningly rapid pace, largely thanks to overexploitation and the expansion of our own population. One of the many affected species are butterflies. They are abundant, ecologically important and act as sensitive indicators of environmental change. However they are , regrettably, rarely included in conservation planning. Looking at the Katavi-Rukwa ecosystem, we see a landscape of contrasting protection levels. Some areas are heavily protected, some are completely unprotected and most lie somewhere in the middle. But what effect do these varying protection levels have on butterfly populations?

To answer this question, researchers surveyed 157 butterfly species using 105 sampling sites across five protection statuses. Using standardised surveying methodology, they collected a vast array of data pertaining to each individual butterfly, including habitat socialization, host-plant specialization and wingspan. In addition to this, data pertaining to environmental conditions was also collected; for example precipitation, percentage of bare ground, shrub cover and human population density.

What they found:

Diversity wasn’t evenly distributed across the landscape. Game Reserves stood out as the strongest hotspots, supporting both the highest species richness and the greatest number of individuals, while National Parks, despite their strict protection, held noticeably fewer butterflies. Each protection category contributed something unique: several species were found only in one type of area, and Game Reserves contained the largest share of these exclusives. It was found that environmental conditions shaped these patterns just as strongly as protection status. Sites with higher vegetation productivity (EVI) consistently supported more species, whereas areas with higher human population density showed clear declines in richness and abundance. Bare soil and shrub cover also influenced how butterfly communities were structured. When the researchers looked at diversity across the whole region, they found that most of the total butterfly richness came from turnover among protection types; meaning that no single category captures the full ecological picture.

Take Home Message:

Together, these findings show that butterfly conservation in the Katavi–Rukwa Ecosystem cannot rely solely on strict protection. Moderately managed landscapes, productive vegetation and reduced human pressure all play crucial roles in sustaining diverse butterfly communities. The study makes the message clear that sometimes protecting biodiversity in this region means embracing the full mosaic of land uses, because each piece of the landscape contributes something essential to the whole.

References:

Giliba, R.A., Loos, J. & Fiedler, K. (2026) Protection status and environmental gradients shape butterfly assemblages in an East African tropical ecosystem. Insect Conservation and Diversity, 1–16. Available from: https://doi.org/10.1111/icad.70125