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The most reliable population data for Rhinoceros Auklet in Canada is from Environment Canada's Seabird Colony Counts (primarily counts of occupied burrows in fixed plots at breeding colonies). These indices of population size are available for four important colonies in the species' Pacific range. At three of the four colonies, counts indicate slight to moderate increases in population abundance since 1984, while at the fourth, counts indicate a slight decrease. Dramatic declines in counts at two additional colonies are the result of predator introductions; because these trends reflect this local conservation issue, they are less likely to reflect the population's national status. The Canadian population has likely changed little or has increased slightly relative to about 1970, but systematic monitoring information prior to 1984 is lacking. Consequently, the assessment of status is considered to only have moderate reliability.
Additional information on: Analysis of Seabird Colony Counts
Annual trend measures changes in relative abundance
Return to table 1 - footnote 1 referrer