Population genomics of the island thrush elucidates one of earth’s great archipelagic radiations

Reeve, Andrew Hart; Gower, Graham; Pujolar, José Martín; Smith, Brian Tilston; Petersen, Bent; Olsson, Urban; Haryoko, Tri; Koane, Bonny; Maiah, Gibson; Blom, Mozes P. K.; Ericson, Per G. P.; Irestedt, Martin; Racimo, Fernando; Jønsson, Knud A.

doi:10.1093/evlett/qrac006

Cited by 1 publication

(2 citation statements)

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“…In island species, island size and the distance to other islands and the mainland were significant as others have found suggesting a reduced role of sexual selection on driving plumage evolution in island species [21]. Limited dispersal to isolated islands may drive plumage color via founder effects, and future work could further assess this hypothesis in species-complexes that have colonized multiple islands [12,32,33].…”

Section: Discussionmentioning

confidence: 88%

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Global patterns of plumage color evolution in island-living passeriform birds

Oud,

Mahoney,

Pageau

et al. 2023

PLoS ONE

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Island environments have the potential to change evolutionary trajectories of morphological traits in species relative to their mainland counterparts due to habitat and resource differences, or by reductions in the intensity of social or sexual selection. Latitude, island size, and isolation may further influence trait evolution through biases in colonization rates. We used a global dataset of passerine plumage color as a model group to identify selective pressures driving morphological evolution of island animals using phylogenetically-controlled analyses. We calculated chromaticity values from red and blue scores extracted from images of the majority of Passeriformes and tested these against the factors hypothesized to influence color evolution. In contrast to predictions based on sexual and social selection theory, we found consistent changes in island female color (lower red and higher blue chromaticity), but no change in males. Instead, island size and distance from mainland and other islands influenced color in both sexes, reinforcing the importance of island physiognomy in shaping evolutionary processes. Interactions between ecological factors and latitude also consistently influenced color for both sexes, supporting a latitudinal gradient hypothesis. Finally, patterns of color evolution varied among families, indicating taxon-specific microevolutionary processes in driving color evolution. Our results show island residency influences color evolution differently between sexes, but the patterns in both sexes are tempered by ecological, island characteristics, and phylogenetic effects that further vary in their importance among families. The key role of environmental factors in shaping bird plumage on islands further suggests a reduced importance of sexual and social factors in driving color evolution.

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Section: Discussionmentioning

confidence: 88%

“…Food resources on islands may differ from those on the mainland, and carotenoid-deficient diets may reduce carotenoid-based (red, orange, yellow) plumage expression [22]. Some island taxa do not follow predicted patterns of plumage color evolution possibly resulting from repeated founder effects [32,33].…”

Section: Introductionmentioning

confidence: 99%