Beyond the mean: adaptive variability in Amazonian aquatic systems

Conventional ecological and conservation approaches often rely on average-based strategies, which obscure the complexity of biological systems. This article revisits the concept of the 'Tyranny of the Golden Mean' to argue that variability and plasticity are not sources of disorder, but essential components of ecological robustness, particularly in the Amazon. The Amazon's extraordinary heterogeneity shapes physiological, biochemical and genetic diversity. At genetic, biochemical and physiological levels, Amazonian aquatic species exhibit resilience, enabled by traits like low oxygen tolerance, metabolic flexibility and microanatomical adaptations. Examples span to amphibians, reptiles, aquatic insects and floodplain trees, illustrating that such adaptive strategies are widespread across taxa. These responses are context-specific and often missed by average values. As environmental changes intensify, conservation strategies based on means become insufficient. Recognizing variability is essential, as it underpins resilience to rapid environmental changes. We advocate for adaptive management, in which biological variability is recognized as a source of strength rather than noise. This approach enables the identification of critical thresholds and tipping points, enhancing the capacity to anticipate and respond to disruption. Ultimately, embracing variability improves conservation effectiveness and aligns with the evolutionary and ecological realities of the Amazon. This article is part of the theme issue 'Embracing variability in comparative physiology: why it matters and what to do with it'.