Warming winters in New Zealand bring insect pests, smaller fruit, and carbon loss from forests

New Zealand is experiencing record warm winter temperatures, and the effects go beyond comfortable weather. RNZ reports that warmer winters are extending tree growth in forests like kauri, but the extra growth does not mean more carbon storage. Higher temperatures increase respiration in trees, releasing more carbon back into the atmosphere, resulting in a net carbon loss. Milder winters also allow invasive insect pests to survive the cold season. Wasp colonies are staying active through winter, and pests like the Queensland fruit fly and cattle ticks may become more common. In alpine zones, invasive mammals are moving to higher elevations, squeezing native birds like the rock wren and kea out of their remaining safe habitats. For horticulture, warmer nights disrupt flowering triggers for apples, avocados, and kiwifruit, leading to smaller and poorer quality fruit. The article highlights how subtle seasonal shifts are already reshaping NZ's landscapes and ecosystems.