. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 93 One of the pair remained with the nestling 15 to 29 days (x=, n=35) after hatching. Afterwards both adults returned periodically to feed their young. The fledging period for young Black-footed Albatross was from 137 to 170 days (x=, n=13); the first young fledged in mid-June and the last one by: 18 July in 196^, 20 July in 1965, mid-July in 1966, and 18 July in 1968. Most young left the atoll in late June or early July. These young did not return to Kure for at least one and one-half years after fl
. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 93 One of the pair remained with the nestling 15 to 29 days (x=, n=35) after hatching. Afterwards both adults returned periodically to feed their young. The fledging period for young Black-footed Albatross was from 137 to 170 days (x=, n=13); the first young fledged in mid-June and the last one by: 18 July in 196^, 20 July in 1965, mid-July in 1966, and 18 July in 1968. Most young left the atoll in late June or early July. These young did not return to Kure for at least one and one-half years after fledging. 300n. young 1964 ' A ' M 1965 Figure BFA-1. Breeding cycle of Black-footed Albatross on Green Island, Kure Atoll, 196^-65. Nesting Success Table BFA-6 summarizes Black-footed Albatross productivity for I963 to 1969- Major factors in nest loss were winter storms, especially in 196^-65 and I968-69, which washed away or buried nests with blowing sands, and rat predation in I966. Hatching success was calculated in 1963-6^ from 50 nests as 66 percent, in 196^-65 from 30 nests as percent, and in 1968-69 from 331 nests as 57-7 percent. Thirty-three percent of the loss in 196^-65 was due to a storm which washed away 10 of the nests. Eighteen (36 percent of eggs laid and 5h S percent of eggs that hatched) of the young fledged in 1963-6^, and 1^5 (1* percent of eggs laid and 75-9 percent of eggs that hatched) fledged in 1968-69. In the incomplete study of 196^-65, nine young (36 percent of eggs laid and percent of eggs that hatched) remained on 30 April. Crude rates of survival to maturity of nestling Black-footed Albatross were obtained (Table BFA-7). Although inexact the figures for the k- and 5-year old birds are probably accurate in a general way as they will be breeding in a year or two and the ones that are still alive should be on the island. The lower rates for the 1966 and I967 cohorts reflect the greater tendency of 2- and 3-year old albatross to remain awa
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