2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/21/2019 | 11:00 AM - 11:15 AM | CONSEQUENCES OF UNPREDICTABLE RIVER FLOW REGIMES FOR LINKED ORGANISMAL-ECOSYSTEM PHENOLOGY IN THE ANTHROPOCENE | 251 DE
CONSEQUENCES OF UNPREDICTABLE RIVER FLOW REGIMES FOR LINKED ORGANISMAL-ECOSYSTEM PHENOLOGY IN THE ANTHROPOCENE
Details of linked organismal-ecosystem phenology associated with the unpredictable flow regimes of New Zealand rivers can shed light on potential influences of climate extremes. Unpredictable flooding and non-seasonal organic matter inputs have led to trophic dynamics most unlike those of continental systems. Trophic generalists are pervasive, and macroinvertebrate life histories are poorly synchronized and involve multiple overlapping cohorts. The unpredictability likely works to ameliorate life-history trade-offs, promoting generalist traits and increasing niche width. However, extreme events are now exceeding the capacity of even extremophiles (e.g. mudfish) to adapt, and are associated with extirpation where dispersal is insufficient. Unpredictable flows, both low and high, also modulate food-web characteristics by controlling energy availability. For example, the occurrence of runaway primary production linked to a trophic cascade driven by non-native trout is most often associated with intermediate levels of flooding Such nonlinearities associated with a dynamic hydroclimatic regime make the effects of the higher magnitude erratic events predicted under climate warming for New Zealand difficult to forecast. However, linking metabolic regimes with existing flow-ecology knowledge from regimes like New Zealand’s has the potential to improve predictability of river ecosystems under global change.
- Disturbance
- Life History
- Food Webs
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Presenters/Authors
Angus McIntosh
(), University of Canterbury, angus.mcintosh@canterbury.ac.nz;
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Jonathan Tonkin
(), University of Canterbury, jonathan.tonkin@canterbury.ac.nz;
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Mark Galatowitsch
(), Centre College, mark.galatowitsch@centre.edu;
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Helen Warburton
(), University of Canterbury, helen.warburton@canterbury.ac.nz;
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