Why the Land Between Habitats Matters as Much as the Habitat Itself

Phuong-Tri Nguyen

Nguyen Tat Thanh University

12-07-2026

© Dulcey Lima

When forests are cleared or grasslands are converted into farmland, wildlife loses its home. But conservation scientists have long debated another question: after habitat is lost, does it also matter how the remaining habitat is arranged?

For decades, fragmented habitats—where remaining natural areas are split into many isolated patches—have been viewed as inherently harmful to biodiversity (Haddad et al., 2015; Pfeifer et al., 2017). Yet separating the effects of fragmentation from those of habitat loss has proven remarkably difficult. After all, when habitats disappear, they often become fragmented at the same time.

A new large-scale experiment offers one of the clearest answers yet. By manipulating habitat loss, fragmentation, and the quality of the surrounding landscape independently across 27 experimental landscapes containing more than 3,000 habitat patches, researchers discovered that fragmentation alone is not the whole story (Fletcher Jr., 2026). Instead, what lies between habitat patches—the surrounding landscape, known as the matrix—can be just as important as the patches themselves.

The study followed wild populations of Chelinidea vittiger, an insect that depends on prickly pear cacti. Researchers found that severe habitat loss consistently reduced populations. Fragmentation also reduced survival and abundance, but mainly when habitat loss was already high. Surprisingly, the quality of the surrounding landscape often had effects comparable to habitat loss itself. Poor-quality matrix habitats reduced populations by nearly one-third, while high-quality surroundings helped buffer many of the negative effects of fragmented landscapes.

Why does the landscape between habitat patches matter so much?

Animals do not experience habitat patches as isolated dots on a map. They constantly move through the surrounding environment while searching for food, mates, shelter, or new territories. A hostile landscape filled with roads, intensive agriculture, or other barriers makes these journeys more dangerous or even impossible. In contrast, a more hospitable landscape allows individuals to move more safely, reconnect isolated populations, and recolonize patches where local populations have disappeared (Fletcher Jr. et al., 2024).

This perspective highlights an important ecological principle: biodiversity depends not only on the amount of suitable habitat but also on how information, energy, and organisms can flow across entire landscapes. Habitat patches function as nodes within a much larger ecological network, and the matrix determines how effectively these nodes remain connected. Improving only the habitat patches while neglecting the surrounding landscape is therefore similar to repairing individual train stations while allowing the railway tracks between them to deteriorate (Vuong, 2024).

The findings also help explain why conservation strategies often produce inconsistent results. Restoring an isolated forest patch may have little effect if it remains surrounded by inhospitable land, whereas improving the quality of farmland, grasslands, or urban green spaces between habitat patches may substantially increase the effectiveness of existing reserves.

As habitat loss continues worldwide, protecting biodiversity will require thinking beyond protected areas alone. Conservation is no longer simply about preserving islands of nature. It is about maintaining the ecological connections that allow species to move, adapt, and survive in an increasingly fragmented natural world (Nguyen, 2025).

References

Fletcher Jr., R. J.  et al. (2024). The prominent role of the matrix in ecology, evolution, and conservation.  Annual Review of Ecology, Evolution, and Systematics, 55, 423-447. https://doi.org/10.1146/annurev-ecolsys-102722-025653

Fletcher Jr., R. J., et al. (2026). Landscape quality drives ecological responses to habitat loss and fragmentation. Nature Ecology & Evolution, 10, 1265-1272. https://doi.org/10.1038/s41559-026-03095-1

Haddad, N. M. et al. (2015). Habitat fragmentation and its lasting impact on Earth. Science Advances, 1, e1500052. https://doi.org/10.1126/sciadv.1500052

Nguyen, M. H. (2025). Value Theory. Kingfisherish Wandering. http://books.google.com/books/about?id=b9HzEQAAQBAJ

Pfeifer, M. et al. (2017). Creation of forest edges has a global impact on forest vertebrates. Nature, 551, 187-191. https://doi.org/10.1038/nature24457

Vuong, Q. H. (2024). Innovation. Wild Wise Weird. http://books.google.com/books/about?id=FUTvEQAAQBAJ