An organism is considered a new species when it achieves reproductive isolation
Biological consensus generally views reproductive isolation as a primary and sufficient criterion for defining species boundaries and understanding speciation.
The retrieved papers consistently support the principle that reproductive isolation is a key criterion or defining hallmark of the speciation process and species boundaries. There are no papers refuting this claim.
Marta Martinez Wells Charles S Henry. Songs, Reproductive Isolation, and Speciation in Cryptic Species of Insects: A Case Study Using Green Lacewings. 1998. https://doi.org/10.1093/oso/9780195109009.003.0016
States that reproductive isolation serves as a sufficient criterion to define species boundaries.
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Ewen Burban, Maud I. Tenaillon, Sylvain Glémin. RIDGE, a tool tailored to detect gene flow barriers across species pairs. 2023. https://doi.org/10.1101/2023.09.16.558049
Highlights that characterizing reproductive isolation and gene flow barriers between diverging lineages is central to understanding speciation.
Ewen Burban. Genomic approach to detecting barriers to gene flow. https://doi.org/10.70675/eee1fbcezca9dz4b70za861z54a03d20fa17
Discusses how populations progressively develop reproductive isolation during the speciation process.
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