The dynamics and the timeline of speciation in the gall-forming aphid Geoica spp. within and among Pistacia host tree species.

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Date: Sept. 2022
Publisher: Elsevier B.V.
Document Type: Report; Chronology; Brief article
Length: 315 words

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Abstract :

Keywords Geoica spp.; Gall-forming aphids; Haplotype; Speciation; Timeline Highlights * The galling aphids of the genus Geoica forms galls on Pistacia trees. * The Geoica galling-aphid went through extensive speciation in the Levant. * The splitting of the genus Geoica between P. atlantica and P. palaestina is estimated to have occurred 24--25 Ma (the Oligocene/Miocene boundary). * Five different Geoica species have been speciating on P. atlantica. * Additional three different Geoica species have been speciating on P. palaestina. Abstract Trees of the genus Pistacia serve as obligate hosts for gall-forming aphids (Hemiptera, Aphididae, Fordini). Each aphid species induces a characteristic gall on a single Pistacia host species. The genus Geoica (Fordini) induce similar spherical closed galls on the lower side of the leaflet's midvein, on different Pistacia species. Two species of Pistacia trees that harbor Geoica galls grow naturally in Israel: P. palaestina and P. atlantica. We analyzed the phylogeny and the genetic structure of the Geoica species complex in Israel, and assessed the genetic differentiation and the level of host plant specificity of the aphids between P. atlantica and P. palaestina. We found that the splitting of the genus between P. atlantica and P. palaestina is estimated to have occurred 24--25 Ma (the Oligocene/Miocene boundary). Five different haplotypes suggesting five different species have been further speciating among Geoica spp., galling on P. atlantica, and an additional three species, on P. palaestina. Author Affiliation: (a) Department of Biology and Environment, Faculty of Natural Sciences, University of Haifa-Oranim, Tivon 36006, Israel (b) Department of Evolutionary and Environmental Biology, Faculty of Natural Sciences, University of Haifa, Haifa 3498838, Israel * Corresponding author. Article History: Received 15 January 2021; Revised 26 May 2022; Accepted 26 May 2022 (footnote)1 Present address: School of Life Sciences, Arizona State University, 427 E Tyler Mall, Tempe, AZ 85281, United States. Byline: Rachel Ben-Shlomo [ekly@research.haifa.ac.il] (a,*), Stav Talal (a,1), Moshe Inbar (b)

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Gale Document Number: GALE|A708782313