Patagonia’s burrowing parrots are eating a diet dominated by introduced plants
WHAT THE EVIDENCE SAYS
Fecal DNA metabarcoding across the annual cycle of a Burrowing Parrot colony detected 202 plant molecular operational taxonomic units. About 40% were introduced and another 4.5% presumed introduced, while roughly 13% were native; diet diversity was highest in the post-breeding period.
WHY IT MATTERS / OUR READ
A species can persist while its food web changes around it. Diet flexibility may buffer land-use change, but heavy use of introduced plants should not automatically be interpreted as equivalent habitat quality or evidence that native foraging resources no longer matter.
CAVEATS / UNCERTAINTY
Metabarcoding detects plant DNA rather than consumed biomass, energetic value or fitness benefit and may not identify the route by which every plant entered the diet. This is one colony, and the study cannot determine whether the shift reflects adaptive flexibility, necessity or a suboptimal diet.
SOURCE
The Science of Nature
View original evidence ↗
Year-round fecal metabarcoding found only a small native share of detected plant taxa, a striking shift that could signal flexibility—or a poorer substitute.
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