Table 2. Breeding seabirds recorded from Matthew and Hunter Islands, and population size estimates (in breeding pairs), based on reports from visits made between 1973 and 2018 (Rancurel, 1973; Barritt, 1976; Condamin, 1978; Lardy et al., 1988a, 1988b; Pandolfi-Benoit, 1993; Borsa, 2004, 2007; Borsa and Baudat-Franceschi, 2009a, 2009b, 2019; Fonfreyde et al., 2018): maximum per species was taken as population size; + species present but no breeding ascertained; - species not recorded or mentioned; ? unidentified petrels present, but no breeding ascertained; NA, no visit to Hunter Island; ns, number of breeding pairs not specified; a Minimal number of breeding pairs, from direct count (Borsa, 2007).
Tabla 2. Aves marinas reproductoras registradas en las islas Matthew y Hunter y estimaciones del tamaño de la población (en parejas reproductoras), sobre la base de informes de visitas realizadas entre 1973 y 2018 ((Rancurel, 1973; Barritt, 1976; Condamin, 1978; Lardy et al., 1988a, 1988b; Pandolfi-Benoit, 1993; Borsa, 2004, 2007; Borsa and Baudat-Franceschi, 2009a, 2009b, 2019; Fonfreyde et al., 2018): el máximo por especie se tomó como el tamaño de la población; + especies presentes pero sin cría comprobada; - especies no registradas o mencionadas; ? petreles no identificados presentes, pero sin cría comprobada; NA, ninguna visita a la isla Hunter; ns, número de parejas reproductoras no especificado; a número mínimo de parejas reproductoras mediante recuento directo (Borsa, 2007).
Date of visit | |||||||||||||
Dec | June | Dec | Sep | Aug | Aug | Dec | June | Apr | Jan | May | June | ||
Site | Species | 1973 | 1974 | 1977 | 1988 | 1993 | 2004 | 2004 | 2006 | 2008 | 2009 | 2013 | 2018 |
Mathew Island | Pterodroma nigripennis | - | - | - | - | - | - | 1:00 AM | - | + | ~100 | - | - |
Ardenna pacifica | - | - | - | - | - | - | 1:00 AM | - | + | > 2 | ≥ 2 | - | |
Hydrobatidae sp. | - | - | - | - | - | - | - | - | + | - | - | - | |
Phaethon rubricauda | - | - | + | + | ≤ 4 | ≥ 1 | - | ≥ 2 | + | + | ≥ 5 | ≥ 10 | |
Sula dactylatra | - | - | - | - | 1 | 8 | 23 | 3 | + | 18 | 31 | ~30 | |
S. leucogaster | + | - | + | + | ≥ 10 | + | 47 a | 3 | 2 | 23 | + | - | |
Anous albivitta | + | - | + | + | ≥ 100 | ~80 | 8:00 AM | ≥ 70 | 14 | 7 | + | ≥ 200 | |
A. stolidus | + | - | > 100 | + | - | - | 132 a | - | + | > 37 | + | < 10 | |
Onychoprion fuscatus | ≥10,000 | + | > 1,000 | > 1,000 | ≥ 1,000 | - | 6,210a | 13,3 | + | 41 | ≤ 2,000 | 20 | |
Gygis alba | - | - | 1 | - | - | - | - | - | - | - | - | - | |
Hunter Island | Pterodroma heraldica | - | - | - | ? | NA | NA | - | 3 | NA | - | + | 20 |
P. nigripennis | - | - | - | ? | NA | NA | 4:00 AM | - | NA | ≥ 5 | - | - | |
Ardenna pacifica | - | - | - | ? | NA | NA | 15 a | - | NA | - | - | - | |
Phaethon rubricauda | + | + | 3 | ns | NA | NA | 29 a | ≥ 13 | NA | ≥ 9 | + | 32 | |
S. dactylatra | - | - | - | ns | NA | NA | 21 | 38 | NA | - | 96 | ~100 | |
S. leucogaster | - | + | + | ns | NA | NA | 18 a | 3 | NA | - | + | 10 | |
S. sula | + | + | + | ns | NA | NA | 324 a | ≥ 521 | NA | ≥ 2 | + | > 100 | |
Fregata ariel | - | + | + | ns | NA | NA | 14 a | ≥ 414 | NA | - | - | 250±50 | |
F. minor | + | - | + | ns | NA | NA | 4:00 AM | 133 | NA | + | + | 60 ± 10 | |
Anous albivitta | + | - | + | + | NA | NA | 4:00 AM | 21 | NA | + | + | + | |
A. minutus | - | - | + | - | NA | NA | - | ≥ 2 | NA | - | - | + | |
A. stolidus | + | - | + | + | NA | NA | 52 a | - | NA | + | + | > 10 | |
G. alba | - | - | + | 1 | NA | NA | 9:00 AM | - | NA | ~20 | + | - |