Birds of Indian Subcontinent

Status and Population Trends of Hawaii's Native Waterbirds, 1977-1987

Publication Type:Journal Article
Year of Publication:1993
Authors:Engilis, Jr., A, Pratt, TK
Journal:The Wilson Bulletin
Date Published:1993
ISBN Number:00435643
Keywords:Anas, Anas wyvilliana, Anatidae, Ardeidae, Fulica, Fulica americana, Fulica atra, Gallinula, Gallinula chloropus, Himantopus, Himantopus himantopus, Himantopus mexicanus, Himantopus nigricollis, Nycticorax, Nycticorax nycticorax, Rallidae, Recurvirostridae
Abstract:Status and population trends of Hawaii's native waterbirds were examined from 1977 through 1987. Waterbird population fluctuations were analyzed in relation to rainfall and land use dynamics. Numbers of Hawaiian Duck (Koloa) (Anas wyvilliana) and Hawaiian Common Moorhen (Gallinula chloropus sandvicensis) appeared stable over time; however, surveys were limited. Increase in Black-crowned Night-Heron (Nycticorax nycticorax) abundance appeared linked to expansion of aquaculture, particularly on Oahu, and not to climatic events. Annual rainfall patterns help explain and predict population fluctuations and anomalous distribution patterns involving Hawaiian American Coots (Fulica americana alai), moorhens, and Hawaiian Black-necked Stilts (Himantopus mexicanus knudseni). Coot, stilt, and moorhen populations fluctuated with climatic events, and intra-island dispersal to ephemeral wetlands occurred. Stilts exhibited regular inter-island migratory behavior, but coots dispersed in relation to major rainfall events. Seasonal fluctuation recorded for coots by past observers is the result of survey techniques not accounting for seasonal dispersal patterns.
Short Title:The Wilson Bulletin
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