Taxacom: Geologists recognize value of panbiogeography

[John Grehan]

It's not surprising that when biogeographers usually model history based on
geological reconstructions and attribute everything to 'chance' that
geologists rarely cite biogeography as relevant to geologist history.
Panbiogeography is the primary exception and in this respect it is nice to
see geologists recognizing the value of panbiogeography in a new paper on
the Easter Island hotspot. In their introductory remarks the (10) authors
note:

" The Easter volcanic island is built on Pliocene ocean floor ?3?4.8 Ma old
(Bonatti et al., 1977; Hagen et al., 1990; Naar & Hey, 1989; Vezzoli &
Acocella, 2009), and the oldest zircon that could have formed during
volcanism or the formation of the underlying oceanic crust may thus be ?4
Ma old. The oldest seamounts associated with this hotspot that are
preserved on the modern ocean floor are in the Tuamotu Seamount chain and
are 48 Ma old (Bello?Gonz?lez et al., 2018) but this is because any older
seamounts would have subducted below South America or Antarctica. It may be
no coincidence that ecological studies in the Eastern Pacific Gal?pagos and
the Juan Fernandez islands have recently postulated the existence of
hot?spot related islands since the Mesozoic for ?in situ? diversification
and evolution of species/populations by dispersal onto new islands from
older ones (Heads & Grehan, 2021; Heads & Saldivia, 2024)."

So, even if many biogeographers are still stuck in the center of
origin-chance dispersal rut, geologists (in this case representing 6
countries) are looking at wider horizons of knowledge. The article (open
access) citation is:  Rojas?Agramonte, Y., Pardo, N., van Hinsbergen, D. J.
J., Winter, C., Marroqu?n?G?mez, M. P., Liu, S., et al. (2024). Zircon
xenocrysts from Easter Island (Rapa Nui) reveal hotspot activity since the
middle Jurassic. AGU Advances, 5, e2024AV001351. https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdoi.org%2F10&data%7C02%7Ctaxacom%40lists.ku.edu%7Cb8c0679d975a476b896b08dcec04a92b%7C3c176536afe643f5b96636feabbe3c1a%7C0%7C0%7C638644751975635716%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=WNgMUV42rqWXq3hcOB7mPbhmx%2BIbhQg3l3ypI9U9T2M%3D&reserved=0.
1029/2024AV001351




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