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- W184022046 abstract "Didymosphenia geminata (Lyngbye) M. Schmidt is a freshwater benthic diatom infamous for its unique ability to bloom in oligotrophic conditions. Two decades ago, there was an abrupt increase in the frequency of these blooms accompanied by rapid range expansion in the Northern Hemisphere. Hypotheses presented to explain this phenomenon included climate change and the existence of a new ‘blooming’ ecotype. In 2004, D. geminata was first recognised in New Zealand. It was considered a threat to biodiversity and recreational, cultural and economic values. The invasion of the Southern Hemisphere renewed research efforts towards understanding this unsightly species. Because the New Zealand occurrence represented an invasion, Biosecurity New Zealand, a government agency responsible for New Zealand’s biosecurity system, lead the response. However, they had very little information about the alga that could be used for strategic planning. Few studies outline the invasion ecology of D. geminata. Meanwhile, it has spread to 37 catchments of the South Island. Managing D. geminata’s invasion process in New Zealand has relied on reports of the alga’s habitat profile in the Northern Hemisphere. Based on these, an early assessment of New Zealand’s suitability for D. geminata suggested that >70% of New Zealand’s river sections (stream order > 3) were highly suitable for D. geminata establishment. Yet D. geminata is invasive in New Zealand, and invasive species often do not follow traditional habitat preferences when in new ranges. An assessment of D. geminata’s invasion pathway and habitat window in New Zealand was paramount for successful species management. My original contribution to knowledge is a description of D. geminata’s invasion ecology in New Zealand. I describe the species’ preferences, tolerances, constraints and limiting factors in terms of invasion, colonisation, growth, removal and recovery. My analysis is based on three studies of D. geminata’s invasion ecology in New Zealand. The first study, based on presence / absence data from national delimiting surveys, determined that overland spread occurred at the same rate as spread between connected bodies of water. The parameters defining D. geminata’s habitat window for colonisation were related to substrata, temperature, geological calcium, geological" @default.
- W184022046 created "2016-06-24" @default.
- W184022046 creator A5056784992 @default.
- W184022046 date "2013-01-01" @default.
- W184022046 modified "2023-09-23" @default.
- W184022046 title "The invasion ecology of Didymosphenia geminata in New Zealand" @default.
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