Global Insect Species Using DNA Barcoding

A recent ecological study published in the Proceedings of the National Academy of Sciences (PNAS) reports DNA barcoding-based estimates of global insect diversity from sampling in the Area de Conservacion Guanacaste (ACG). The study states that over 90% of global insect biodiversity remains entirely unknown and uses Malaise traps and caterpillar-breeding to catalog insect species, including Microgastrinae parasitoid wasps.

DNA Barcoding-Based Global Insect Species Estimation (PNAS Study, ACG):

Dimension	Key Details
Publication	The ecological study has been published in the Proceedings of the National Academy of Sciences (PNAS).
Key finding on unknown biodiversity	Unknown global insect biodiversity comprises over 90% of total global insect biodiversity.
Focal insect group	The research focus comprises Microgastrinae, a highly diverse subfamily of parasitoid wasps.
Microgastrinae-host interaction	Microgastrinae parasitoid behavior comprises laying eggs inside living caterpillars, with larvae consuming the host from inside out before emerging.
Sampling tool	Malaise traps comprise specialized tent-like mesh structures designed to catch flying insects.
Sampling design	Sampling comprises 15 Malaise traps across undisturbed core zones and modified peripheral zones of the ACG.
Captured insects	Captured specimens comprise a total of 1.63 million tropical insects.
Species identification technique	DNA barcoding comprises sequencing a short, standardized fragment of mitochondrial DNA to rapidly identify and differentiate species.
Core-trap species output	Core Malaise trap results comprise 53,945 distinct insect species.
Microgastrinae catalog within reserve	The Microgastrinae catalog within the reserve comprises 1,414 distinct species, when combined with specimens bred directly from collected caterpillars.
ACG tree species count	The ACG reserve tree diversity comprises 1,200 to 1,500 tree species.
Global tree species benchmark	The world’s estimated tree diversity comprises 73,000 tree species.
Preferred global insect estimate	The preferred global estimate comprises 20.3 million insect species, based on scaling from ACG tree species to global tree species.
Alternative estimate range	The conservative global range comprises 14.2 million to 20.3 million insect species.
Alternative cross-check groups	Alternative checks comprise scaling against other well-mapped local groups: amphibians, mammals, and Saturniid (emperor) moths.
Stated drivers of insect population drops	Pressures linked to insect population drops comprise human activities, habitat fragmentation, and climate change.
Stated capacity gap	The gap highlighted by the study comprises a shortage of specialized taxonomists and a need for rapid molecular tools like DNA barcoding.