Risk of commercial fisheries to New Zealand seabird populations: Supplementary information


Richard, Y., & Abraham, E. R. (2013). Risk of commercial fisheries to New Zealand seabird populations: Supplementary information. New Zealand Aquatic Environment and Biodiversity Report No. 109S. 58 p. Retrieved from http://www.mpi.govt.nz/document-vault/4266


This supplementary information presents a summary of population and distributional data for the 70 species included in the risk assessment of the impact of fishing-related mortalities on seabirds breeding in the New Zealand region. For each seabird species included in the risk assessment, the demographic parameters used were the New Zealand population size, the age at first reproduction, and the survival rate. For species for which no demographic estimates were available, values from proxy species were used, as indicated with a reference to the data source. Distributional data are presented as maps of the at-sea distribution of each species, with separate maps for the non-breeding and breeding distributions. The distribution of non-breeders was derived from existing maps published by NABIS (National Aquatic Biodiversity Information System) and Birdlife International. A single distribution map was generated when the breeding season extended throughout the year. Included in the distributional maps are data of any incidental captures in commercial trawl, longline and set-net fisheries between the 2006–2007 and 2010–2011 fishing years, recorded by fisheries observers.

A detailed description of the methods used to derive the data presented here is provided in Section 2 of the risk assessment.