| 30 Mar 2026
A Community-Trait-Phylogenetic Framework: Ecological and Evolutionary Integration for Soil Microarthropod Assembly
Abstract. Why does a single square meter of forest soil harbour thousands of animal species? Fifty years after Jonathan M. Anderson raised this question, soil ecology still struggles with a fragmented view on the coexistence of species. Researchers often study taxonomy, functional traits, and phylogeny in isolation. Each approach adds insight but leaves gaps in the picture of soil biodiversity.
In this paper, I propose a Community-Trait-Phylogenetic Ecology framework that integrates evolutionary and ecological perspectives to explain how soil animal communities form and persist. The framework combines three research fields:
- Biogeography – describes species composition across local, regional, and global scales.
- Functional traits – divided into α‑niche traits (resource use) and β‑niche traits (environmental tolerance), showing whether resource partitioning or filtering by environment drives community assembly.
- Phylogeny – shapes trait expression and defines the pool of species.
Evidence from the dominant soil microarthropods, springtails (Hexapoda: Collembola) and oribatid mites (Acari: Oribatida), shows the value of this framework. Global data synthesis reveals a mismatch between density and diversity, which challenges traditional biogeographic predictions. Trait analyses show that environmental filtering occurs at global scales. At regional and local scales, cryptic species that diverged millions of years ago coexist with distinct habitat preferences. In addition, ancient and recent lineages coexist across elevations. Morphological and physiological traits usually follow phylogenetic constraints. In contrast, trophic traits show high flexibility, which allows closely related species to coexist.
This integrative view shifts soil animal ecology from describing patterns to understanding the mechanisms responsible for them. It also supports predictions of community responses to climate change and land‑use change. Finally, it can guide conservation strategies for soil habitats that protect species, functional, and evolutionary diversity of soil biota.
I really liked this paper for its original approach and integrative nature. It is worth publishing with little revision. Some suggestions follow below.
Line 29: I believe the main reason why Joe Anderson called the species richness of soil invertebrates an “enigma” was that it seemed to conflict with the then popular concept of limiting similarity, as formulated by Gause and elaborated by ecologists such as G.E. Hutchinson (1959) and R. MacArthur (1967). So it might be appropriate to refer to one of these classical papers.
Line 49: determination = identification
Line 90: Variations = Variation
Line 110: show strong = show a strong
Line 111: signal = signals
Line 121: I think it would be helpful here to indicate what are the “traditional perspectives” that you refer to. Can you mention a key paper that has promoted this argument, e.g. that the common linear rank abundance graphs (that also hold for Collembola and Oribatida) suggest that higher overall abundance implies more scope for rare species.
Line 143: I don’t understand what you mean by “more directly”. More than what? Can something be more direct than direct? Delete “more”.
Line 152: The study = Studies
Line 185: “physiological functions” – what about morphological traits?
Line 219: What is missing here is a prospect that depicts how the new framework can be used in practice. I understand that you cannot include a complete data analysis in this paper, but maybe you can refer to ongoing work or papers to come that report a statistical analysis proving the correctness of the framework presented in this paper.