‘Species’ Is Not the (Only) Unit of Biodiversity: A Process-Philosophical Perspective on Conservation Concepts

In this paper, we argue that the concept of ‘species’ should not be the main focus of research and policies in biodiversity conservation. Diversity is important at all levels of life: within species as well as among them and within and among ecosystems. First, we give a brief overview of the debate about the necessity to find a unified concept of ‘species’. In this, we side with Charles Darwin, who insisted that no strict definition could be given to this term, which is ultimately a matter of arbitrary and pragmatic human language. This did not worry Darwin, and neither should it concern biologists or ecologists today. Darwin's great discovery relied on a recognition of the many differences within species, not on their similarities. Next, we argue that the focus on species and the neglect of other diversity measures in the conservation discourse have led to problems in public perception of—and policies on—conservation and biodiversity. In areas with few species, intraspecific diversity is often of utmost importance to ecosystem processes and functions, and such regions may provide the environmental conditions that enable and promote the diversification of specialised subgroups in the absence (or reduction) of interspecific competition. We give some examples of these processes based on research in marine and freshwater ecosystems, focusing on Iceland and the subarctic region. Finally, we refer to alternative, emerging methodologies of assessing ecosystem health which go beyond the quantitative method of counting species and subspecies and instead emphasise more complex phenomena such as relations, interactions and processes. These approaches, we suggest, are consistent with the philosophical tradition called ‘process ontology’, and we argue that both ecological research and conservation policy can benefit from a process philosophical perspective. Finally, we briefly discuss our motivations for finding this topic to be of importance.