2025-03-12 ミシガン大学
<関連情報>
- https://news.umich.edu/want-to-preserve-biodiversity-go-big-u-m-researchers-say/
- https://www.nature.com/articles/s41586-025-08688-7
断片化されたランドスケープでは、種の入れ替わりは生物多様性を救わない Species turnover does not rescue biodiversity in fragmented landscapes
Thiago Gonçalves-Souza,Jonathan M. Chase,Nick M. Haddad,Maurício H. Vancine,Raphael K. Didham,Felipe L. P. Melo,Marcelo A. Aizen,Enrico Bernard,Adriano G. Chiarello,Deborah Faria,Heloise Gibb,Marcelo G. de Lima,Luiz F. S. Magnago,Eduardo Mariano-Neto,André A. Nogueira,André Nemésio,Marcelo Passamani,Bruno X. Pinho,Larissa Rocha-Santos,Rodolpho C. Rodrigues,Nathalia Vieira Hissa Safar,Bráulio A. Santos,Alejandra Soto-Werschitz,Marcelo Tabarelli,… Nathan J. Sanders
Nature Published:12 March 2025
DOI:https://doi.org/10.1038/s41586-025-08688-7
Abstract
Habitat fragmentation generally reduces biodiversity at the patch scale (α diversity). However, there is ongoing debate about whether such negative effects can be alleviated at the landscape scale (γ diversity) if among-patch diversity (β diversity) increases as a result of fragmentation. This controversial view has not been rigorously tested. Here we use a dataset of 4,006 taxa across 37 studies from 6 continents to test the effects of fragmentation on biodiversity across scales by explicitly comparing continuous and fragmented landscapes. We find that fragmented landscapes consistently have both lower α diversity and lower γ diversity. Although fragmented landscapes did tend to have higher β diversity, this did not translate into higher γ diversity. Our findings refute claims that habitat fragmentation can increase biodiversity at landscape scales, and emphasize the need to restore habitat and increase connectivity to minimize biodiversity loss at ever-increasing scales.
