Search

Biological diversification often includes burst of lineage splitting. Such "radiation" has been known to act as evolutionary arenas with the potential to generate unique phylogenetic clusters and further novel groups. Although these radiations when accompanied by ecological diversification, so‐called "adaptive radiation" have persisted as a central premise in evolutionary biology, the ecological and genetic mechanism of such rapid diversification has remained unclear. There are several critical definitions for the pattern of adaptive radiation, and those provide delimitation of adaptive and non‐adaptive radiation. That being said, only a few studies have provided any clear demarcations in our understanding of the adaptive and non‐adaptive causes of radiation from the mechanism of speciation. Here, we review the current consensus for the causes of adaptive radiation, especially along with the recent theoretical synthesis of "ecological speciation." Further, we suggest the signature of adaptive and non‐adaptive radiation in the earliest stages of diversification from the viewpoint of speciation. These criteria from the speciation view are useful to find the cases with the signatures of adaptive/non‐adaptive radiation. [ABSTRACT FROM AUTHOR]

Keywords: adaptive radiation; evolutionary radiation; non-adaptive radiation; sexual radiation; speciation EN adaptive radiation evolutionary radiation non-adaptive radiation sexual radiation speciation 108 118 11 04/13/22 20220401 NES 220401 Increasing evidence suggests that there are diverse types of evolutionary radiation, yet there is no widely accepted method to classify them. Adaptive radiation, evolutionary radiation, non-adaptive radiation, speciation, sexual radiation Since the mode of evolutionary radiation is uniform within each of three small radiations, the entire radiation can be explained by a combination of three simple models gl CONCLUSIONS AND FUTURE DIRECTIONS From the perspective of the functions of classification in promoting scientific research, I proposed that classification of evolutionary radiations should ideally be associated with generating mechanisms behind them. By dividing the abstract space defined by such axes into smaller regions, they classified instances of rapid radiation into the following five types: classic adaptive radiations; non-adaptive radiations; sexual radiations; microhabitat-driven radiations; ecological novelty without species richness. [Extracted from the article]

Considering that ecological speciation itself is fragile (Gow et al., 2006), ecological and phenotypic patterns in the same evolutionary radiation change over time from the pattern of non-adaptive radiation to that of adaptive radiation, and vice versa. Keywords: Adaptive radiation; ecological speciation; incipient radiation; non-adaptive radiation; reproductive isolation EN Adaptive radiation ecological speciation incipient radiation non-adaptive radiation reproductive isolation 127 129 3 04/13/22 20220401 NES 220401 Our paper intends to reply to Kagawa's comment paper (2021), "Towards a mechanism-based classification of evolutionary radiations", which raised an important question about "the definition of adaptive/non-adaptive radiation and its applicability to interpret evolutionary radiations" reported by Matsubayashi and Yamaguchi (2021). Ecological speciation, non-adaptive radiation, reproductive isolation, Adaptive radiation, incipient radiation. [Extracted from the article]