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Article Dans Une Revue The American Naturalist Année : 2024

Infrequent long-range dispersal and evolution of a top terrestrial arthropod predator in the sub-Antarctic

Susan Kennedy
Melissa Houghton
Domagoj Gajski
Shahan Derkarabetian
Henrik Krehenwinkel
David Renault

Résumé

The sub-Antarctic terrestrial ecosystems survive on isolated oceanic islands in the path of circumpolar currents and winds that have raged for more than 30 million years and are shaped by climatic cycles that surpass the tolerance limits of many species. Surprisingly little is known about how these ecosystems assembled their native terrestrial fauna and how such processes have changed over time. Here, we demonstrate the patterns and timing of colonization and speciation in the largest and dominant arthropod predators in the eastern sub-Antarctic: spiders of the genus Myro. Our results indicate that this lineage originated from Australia before the Plio-Pleistocenic glacial cycles and underwent an adaptive radiation on the Crozet archipelago, from where one native species colonized multiple remote archipelagos via the Antarctic circumpolar current across thousands of kilometers. The results indicate limited natural connectivity between terrestrial macroinvertebrate faunas in the eastern sub-Antarctic and partial survival of repeated glaciations in the Plio-Pleistocene. Furthermore, our findings highlight that by integrating arthropod taxa from multiple continents, the climatically more stable volcanic Crozet archipelago played a critical role in the evolution and distribution of arthropod life in the sub-Antarctic.
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Dates et versions

hal-04649241 , version 1 (16-07-2024)

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Citer

Jonas O. Wolff, Susan Kennedy, Melissa Houghton, Penelope Pascoe, Domagoj Gajski, et al.. Infrequent long-range dispersal and evolution of a top terrestrial arthropod predator in the sub-Antarctic. The American Naturalist, 2024, ⟨10.1086/730827⟩. ⟨hal-04649241⟩
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