On defining and quantifying biotic homogenization

TLDR

Biotic homogenization (BH) is the increasing similarity of regional biotas over time, driven by species invasions, extinctions, and environmental changes, yet the term is often misused and lacks a clear, agreed definition. The authors aim to provide an operational definition of BH and evaluate the methods used to study it. They assess the strengths and weaknesses of existing BH measurement approaches and propose recommendations for future research. They conclude that researchers must clearly define BH across genetic, taxonomic, and functional realms, track species identities rather than richness, and use more rigorous quantification methods.

Abstract

ABSTRACT Ongoing species invasions and extinctions are changing biological diversity in different ways at different spatial scales. Biotic homogenization (or BH) refers to the process by which the genetic, taxonomic or functional similarities of regional biotas increase over time. It is a multifaceted process that encompasses species invasions, extinctions and environmental alterations, focusing on how the identities of species (or their genetic or functional attributes) change over space and time. Despite the increasing use of the term BH in conservation biology, it is often used erroneously as a synonym for patterns of species invasions, loss of native species or changes in species richness through time. This reflects the absence of an agreed‐upon, cogent definition of BH. Here, we offer an operational definition for BH and review the various methodologies used to study this process. We identify the strengths and weaknesses of these approaches, and make explicit recommendations for future studies. We conclude by citing the need for researchers to: (1) consider carefully the definition of BH by recognizing the genetic, taxonomic and functional realms of this process; (2) recognize that documenting taxonomic homogenization requires tracking the identity of species (not species richness) comprising biotas through space and time; and (3) employ more rigorous methods for quantifying BH.