TY - JOUR

T1 - Multiple paths toward repeated phenotypic evolution in the spiny-leg adaptive radiation (Tetragnatha; Hawai'i)

AU - Cerca, José

AU - Cotoras, Darko D.

AU - Santander, Cindy G.

AU - Bieker, Vanessa C.

AU - Hutchins, Leke

AU - Morin-Lagos, Jaime

AU - Prada, Carlos F.

AU - Kennedy, Susan

AU - Krehenwinkel, Henrik

AU - Rominger, Andrew J.

AU - Meier, Joana

AU - Dimitrov, Dimitar

AU - Struck, Torsten H.

AU - Gillespie, Rosemary G.

N1 - Publisher Copyright: © 2023 The Authors. Molecular Ecology published by John Wiley & Sons Ltd.

PY - 2023

Y1 - 2023

N2 - The repeated evolution of phenotypes provides clear evidence for the role of natural selection in driving evolutionary change. However, the evolutionary origin of repeated phenotypes can be difficult to disentangle as it can arise from a combination of factors such as gene flow, shared ancestral polymorphisms or mutation. Here, we investigate the presence of these evolutionary processes in the Hawaiian spiny-leg Tetragnatha adaptive radiation, which includes four microhabitat-specialists or ecomorphs, with different body pigmentation and size (Green, Large Brown, Maroon, and Small Brown). We investigated the evolutionary history of this radiation using 76 newly generated low-coverage, whole-genome resequenced samples, along with phylogenetic and population genomic tools. Considering the Green ecomorph as the ancestral state, our results suggest that the Green ecomorph likely re-evolved once, the Large Brown and Maroon ecomorphs evolved twice and the Small Brown evolved three times. We found that the evolution of the Maroon and Small Brown ecomorphs likely involved ancestral hybridization events, while the Green and Large Brown ecomorphs likely evolved through novel mutations, despite a high rate of incomplete lineage sorting in the dataset. Our findings demonstrate that the repeated evolution of ecomorphs in the Hawaiian spiny-leg Tetragnatha is influenced by multiple evolutionary processes.

AB - The repeated evolution of phenotypes provides clear evidence for the role of natural selection in driving evolutionary change. However, the evolutionary origin of repeated phenotypes can be difficult to disentangle as it can arise from a combination of factors such as gene flow, shared ancestral polymorphisms or mutation. Here, we investigate the presence of these evolutionary processes in the Hawaiian spiny-leg Tetragnatha adaptive radiation, which includes four microhabitat-specialists or ecomorphs, with different body pigmentation and size (Green, Large Brown, Maroon, and Small Brown). We investigated the evolutionary history of this radiation using 76 newly generated low-coverage, whole-genome resequenced samples, along with phylogenetic and population genomic tools. Considering the Green ecomorph as the ancestral state, our results suggest that the Green ecomorph likely re-evolved once, the Large Brown and Maroon ecomorphs evolved twice and the Small Brown evolved three times. We found that the evolution of the Maroon and Small Brown ecomorphs likely involved ancestral hybridization events, while the Green and Large Brown ecomorphs likely evolved through novel mutations, despite a high rate of incomplete lineage sorting in the dataset. Our findings demonstrate that the repeated evolution of ecomorphs in the Hawaiian spiny-leg Tetragnatha is influenced by multiple evolutionary processes.

KW - ancestral shared polymorphism

KW - Araneae

KW - convergent evolution

KW - de novo mutation

KW - genomic divergence

KW - hybridization

KW - introgression

KW - parallel evolution

KW - standing genetic variation

KW - Tetragnathidae

U2 - 10.1111/mec.17082

DO - 10.1111/mec.17082

M3 - Journal article

C2 - 37515430

AN - SCOPUS:85166416541

VL - 32

SP - 4971

EP - 4985

JO - Molecular Ecology

JF - Molecular Ecology

SN - 0962-1083

IS - 18

ER -