Trophic interactions and ecosystem management at the New Zealand Subantarctic Islands

A study of the New Zealand Sub-Antarctic Islands revealed strong trophic linkages between marine and terrestrial ecosystems, extending beyond local scales. Using stable isotope analysis (δ¹⁵N and δ¹³C), researchers found that both Antipodes and Bounty Islands exhibit complex food webs with omnivory across multiple trophic levels. While Antipodes Island demonstrated a more intricate marine community influenced by phytoplankton and kelp, the Bounty Islands relied solely on phytoplankton-derived carbon. Terrestrial species at both sites incorporated marine-derived nutrients, with Antipodes showing mixed sources while Bounty was entirely dependent on marine inputs linked to phytoplankton. Nutrient sampling further indicated distinct oceanographic patterns around each island. This research underscores the need for integrated ecosystem-based management (EBM) to preserve these critical biodiversity hubs, advocating for cross-sectoral collaboration in policy and legislation.

Cooper, S. D. Trophic interactions and ecosystem management at the New Zealand Subantarctic Islands. https://doi.org/10.26686/wgtn.17006422