'Half the tree of life' ecologists' horror as nature reserves emptied of insects
a year ago
- #biodiversity
- #climate-change
- #entomology
- Daniel Janzen's life-changing accident led him to study insects in Costa Rica, revealing a rich biodiversity.
- Janzen and his spouse Winnie Hallwachs observed drastic declines in insect populations in protected forests.
- Global insect biomass is declining at an estimated rate of 1-2.5% annually due to pesticides, habitat loss, and climate change.
- Protected areas like nature reserves in Germany, the US, and Puerto Rico report significant insect population drops.
- Insect declines are causing cascading effects, including reductions in bird, lizard, and frog populations.
- Climate change is emerging as the primary driver of biodiversity loss, disrupting ecosystems globally.
- Janzen and Hallwachs note that even in pesticide-free zones, insect numbers are plummeting due to climate shifts.
- Entomologists like David Wagner report unprecedented declines, with some regions losing up to 5% of insect biomass yearly.
- The loss of insects threatens entire food webs, with insectivorous birds and other species facing steep declines.
- Scientists warn that without urgent action, many species may disappear within decades.