Resilience is a widely invoked concept in stream ecology, yet its multiple dimensions—ecological and human—are often underappreciated. Moreover, ecological resilience can be either beneficial or obstructive, depending on the context. Drawing on research from Aotearoa New Zealand, I explore these dimensions in detail.
First, while stream ecologists have emphasized dispersal and stochasticity in recovery from disturbance, density dependence remains a crucial, yet overlooked, mechanism. This is evident in fish and invertebrate responses to floods, drying, and fishing.
Second, recolonization rarely begins from a blank slate. The existing community can strongly influence assembly outcomes. This relates to what Sam Lake termed negative resilience, where, for example, a pre-existing community of tolerant taxa can inhibit the return of desired species, and our recent review of river restoration literature suggests that the linked biotic interactions are often ignored in stream restoration.
Third, key characteristics underpinning resilience operate at large spatial scales. Riverscape heterogeneity—variation in composition and asynchronous population dynamics across patches—supports landscape-level resilience via spatial and species-based insurance effects. In Aotearoa’s flood-prone braided rivers these effects are especially important for sustaining this resilience.
Finally, experimental perturbations across rivers of varying sizes suggest that small rivers may be more vulnerable yet easier to restore, due to lower resistance and resilience. However, a purely ecological lens overlooks vital human dimensions. Indigenous communities in Aotearoa maintain deep, intergenerational connections to specific river places—especially large rivers—requiring ecologists to engage with these cultural contexts.
Embracing the full spectrum of riverine resilience—ecological and human—will enhance outcomes for both river ecosystems and the communities that depend on them.