Prion vittatus macgillivrayi
St. Paul’s in the Indian Ocean.
Previously ascribed to P. vittata, and sometimes given full species status#R#R, but position had been considered intermediate between P. salvini and P. vittata#R. However, recent discovery that, along with P. vittata, another (narrow-billed) form of Pachyptila, in addition to P. salvini, breeds on Gough lead to renewed interest in the present taxon, because the ‘new’ S Atlantic population shows a strong degree of morphological congruence with P. macgillivrayi in S Indian Ocean. Given that on Gough the two forms of P. vittata breed assortatively and are spatially segregated, and that elsewhere two species of Pachyptila, showing comparable differences in bill widths, breed sympatrically at similarly offset times—P. belcheri with P. desolata and P. salvini with P. desolata in the Crozet Is—it seems reasonable to believe that two species are involved. Gough birds are provisionally accepted to involve macgillivrayi and, equally provisionally, this taxon is considered to merit specific status. Nevertheless, both assumptions require further testing, including molecularly. Monotypic.
S Indian Ocean, breeding on St Paul I (Roche Quille) and formerly on Amsterdam I.
Food and feeding
Status and conservation
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