Miocene ants (Hymenoptera: Formicidae) of Russia and adjacent territoriesтезисы доклада

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Работа с тезисами доклада

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1. Perfilieva_abstr.pdf Perfilieva_abstr.pdf 182,8 КБ 4 мая 2016 [Perfilieva_Ksenia]

[1] Perfilieva K. S. Miocene ants (hymenoptera: Formicidae) of russia and adjacent territories // Abstracts of 7th International Conferece on Fossil Insects, Arthropods and Amber, National Museum of Scotland. — Edinburgh, UK, 2016. — P. 78–78. There are several Miocene localities known to date in Russia (and adjacent territories), which occupies a large territory of Eurasia. We have collections from the localities of the Crimea (Kerch), Buryatia (Ust-Dzhilinda), East Sayan Mountains (Ourika valley), Russian Far East (Amgu, Velikaya Kema) and the Caucasus. The ant assemblage is a very informative characteristic of the biocenosis. Groups forming the ant assemblage were initially classified as herpetobionts, hortobionts and dendrobionts (foraging on the earth surface, in the herb layer and on trees, respectively), being accompanied later with stratobionts (foraging within leaf litter) and geobionts (foraging in soil). Studying the ratio of dendrobionts, geobionts and other groups gives a picture of biocenosis' features. We attempted to reconstruct Oligocene — Miocene changes using our description of the available fossil ant assemblages. Our findings showed a resemblance between ant assemblages of Russia and Europe in some aspects. For example, there is a case, known as Wheeler's dilemma, concerning the former coexistence of ant genera, which arc currently restricted either to the Holarctic or the tropics. These are Formica and Lasius. with extant species in temperate Eurasia, and Oecophylla and Myrmeciinae, with extant species known exclusively in tropics. The comparison of ant assemblages from the Miocene with more recent assemblages reveals climatic and biotic changes. We observed not only temporal differences, but geographic ones as well. Analysis of similarities and differences in the composition of ant assemblages permits discussion on the existence of diverse communities within the geological periods. Ant assemblages of the Russian Far East arc more similar to the Chinese and the European ones than to their North American counterparts. The temporal trend (from Eocene to Miocene) is characterised by an increase in the proportion of Myrmicinae and a decrease in the proportion of "professional" dendrobionts — Dolichoderinae. The presence of thermophilic Oecophylla, Myrmeciinae in Miocene deposits revealed, in our opinion, the lesser influence of climatic factors (compared with biotic factors) on the changes in communities.

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