Ring Species and Speciation
Summary
Ingested 2026-04-21. 1 findings extracted and verified.
Findings worth citing
Finding 1 — The greenish warbler (Phylloscopus trochiloides) is the best remaining example of a true ring species, with sympatric non-interbreeding northern subspecies connected by a continuous ring around the Tibetan Plateau.
Phylloscopus trochiloides, the greenish warbler, is perhaps the best remaining example of a ring species. Greenish warblers have six named subspecies. In central Siberia the ranges of two widely distributed northern forms, P.t. plumbeitarsus and P.t. viridanus, overlap and the two live sympatrically without interbreeding. — p. 4
Why this is citable: This synthesis claim is frequently cited to justify the choice of Phylloscopus trochiloides as the canonical ring species example when contrasting true ring species against other putative cases, and to illustrate how ring species can inform studies of speciation and ecological divergence.
Counter / limitation: The paper itself notes a large gap in the ring distribution in northeastern China (attributed to recent deforestation), undermining the claim of a fully continuous ring; the finding’s phrasing of ‘continuous ring’ therefore overstates what the evidence shows. Readers wanting primary empirical evidence should consult Irwin et al. (2001) or Irwin (2002) directly.
Topics: ring_species, speciation, phylloscopus, avian_evolution