Environment, Coupling, and Agency — Why Organisms and Surroundings Co-Produce Each Other

Opening Orientation

Biological explanation often begins by distinguishing organisms from their environments. In this familiar framing, organisms are treated as discrete entities that respond to external conditions, with adaptation understood as the process by which they become better suited to those conditions.

While this perspective has been highly productive, it risks obscuring a more fundamental feature of living systems: the inseparability of organism and environment in the ongoing production of biological organisation.

The Agency–Process–Scale (APS) framework reframes this relationship by rejecting the idea that the environment is a fixed external domain. Instead, APS treats the environment as a relational field that emerges through the ongoing interaction between a system’s biological organisation and its surroundings.

This interaction is not incidental. It is constitutive of life itself.

In APS, this coupling is not an additional feature of biological systems but the condition under which physiological regulation and adaptive reorganisation occur. The persistence and transformation of biological organisation therefore depend on the continuous interaction between systems and their environments.

Environment as a Relational Domain

In APS, the environment is not defined as everything outside an organism, but as the subset of conditions that are functionally integrated into its viability-oriented organisation.

This shift from externality to relational relevance is critical. Many physical and chemical features may surround a system, but only those that enter into its constraint-closed processes become part of its effective environment.

This dissolves the sharp boundary between organism and environment. Instead of two independently defined domains, APS identifies a dynamically structured relation in which environmental features acquire biological significance only through their participation in ongoing organisational activity.

The environment, in this sense, is not given in advance but enacted through the ongoing activity of the system.

Coupling as Co-Constitution

The concept of coupling provides the mechanism through which this relational structure is established.

Coupling refers to the ongoing interaction between a system and its surroundings through which each constrains and enables the other. It is through coupling that environmental features become incorporated into the system’s organisation, and through which the system, in turn, modifies those features.

This is not a one-way causal relation. The organism does not simply respond to an already-defined environment. Rather, organism and environment are co-specified through their interaction.

The environment is therefore continuously reconfigured as coupling unfolds.

Coupling therefore provides the processual basis through which viability-oriented organisation is sustained across changing conditions.

Agency as Viability-Oriented Regulation

Within this coupled system, biological agency is the activity through which the organism regulates the conditions required for its own persistence.

Agency is not an additional property layered onto an otherwise passive system. It is the ongoing modulation of constraints that sustain viability.

Through this activity, organisms do not merely endure environmental conditions; they actively restructure them. Processes such as metabolic exchange, behavioural adjustment, and niche construction are all expressions of this viability-oriented regulation.

In each case, the system modifies its own conditions of existence by reorganising its relations with its surroundings.

In this way, agency operates through coupling: the regulation of viability is always the regulation of system–environment relations.

Implications for Biological Explanation

Reframing environment, coupling, and biological agency as co-constitutive has important consequences for biological explanation.

It shifts emphasis away from external selection pressures acting on passive entities and toward the active organisation of systems that sustain themselves through ongoing interaction.

This does not eliminate the role of selection or environmental constraint, but situates them within a broader organisational context. Environmental conditions matter because they are taken up into viability-oriented organisation, and selection operates on systems that already maintain this organisation through their own activity.

Adaptation, in this context, is the reorganisation of these coupled relations. Living systems maintain viability not by adjusting internal states alone, but by reshaping the structure of their interaction with their environments.

More broadly, this perspective clarifies why biological systems cannot be understood solely in terms of their components or their surroundings taken independently. Explanation must instead attend to the relational processes through which organisation is maintained and transformed across time through system–environment coupling.

Key Point

In APS, environment, coupling, and biological agency are co-constitutive aspects of viability-oriented organisation through which living systems and their conditions of existence are continuously co-produced.