population trend

Meta-analysis of status and trends in breeding populations of black-fronted terns (Chlidonias albostriatus) 1962

Black-fronted tern (Chlidonias albostriatus) breeding populations on braided rivers in the South Island, New Zealand, are assumed to be in decline as their habitat comes under increasing pressure from exotic pests, hydroelectric power development and water abstraction. We collated 326 index counts of black-fronted terns from 2313 km of surveys on 84 rivers throughout their breeding range to test this assumption. Black-fronted terns were observed on 73% (n = 61) of rivers surveyed, and the sum of the most recent counts was 8325 birds.