The sequential evolution of angiosperm plants and their mammal herbivores was tracked by the evolution of beetles, shows a newly published study from the Zoological Research Museum Alexander Koenig – Leibniz Institute for Animal Biodiversity in Bonn and the Natural History Museum London in Proceedings of the Royal Society B. using DNA sequences.
A typical species of the genus Schizonycha, which belongs to the chafers.
copyright: Dr. Dirk Ahrens, ZFMK, Bonn
Dr. Dirk Ahrens, Dr. Julia Schwarzer and their colleague Prof. Alfried Vogler reconstructed a phylogeny of scarab beetles, which include stag beetles, dung beetles and chafers. The researches dated the different lineages using fossils and a molecular clock.
The researchers showed that plant-feeding chafers, which are among the most diverse beetle groups in the world, arose almost immediately after the origin of the angiosperms in the Middle Cretaceous. The same lineage also gave rise to dung beetles, but they originated much later, and only after the mammals, including the even-toed ungulates (Artiodactyla) as the most important herbivores, had themselves started to use the angiosperms as their food source. The late origin of dung feeding rejects the widely held hypothesis that early dung beetles fed initially on dinosaur dung, which already were extinct by that time. Instead, the evolution of angiosperm plants provided a new resource that first enabled the origins of herbivory in mammals and beetles, and secondary dung feeding among the scarab beetles.
However, the researchers still try to unravel the mystery of why there are so many species of chafers. In contrast to other plant feeding insects, chafers are not specialised on certain plant species. It might thus be possible that the copious leaf litter produced by the angiosperms created highly suitable conditions for these beetles and their soil-dwelling larvae.
Dr. Dirk Ahrens
Zoologisches Forschungsmuseum Alexander Koenig
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The paper and any related press releases are made available – under embargo – to the media via a password protected press site. This press release will also be made available to journalists on the Royal Society’s press site.
Ahrens D, Schwarzer J, Vogler AP. 2014 The evolution of scarab beetles tracks the sequential rise of angiosperms and mammals. Proc. R. Soc. B 20141470.
ZFMK: Zoologisches Forschungsmuseum Alexander Koenig - Leibniz-Institute for animal biodiversity is part of the Leibniz Association, a network of 89 scientifically, legally and economically independent research institutes and scientific service facilities. Leibniz Institutes perform strategic- and thematically-oriented research and offer scientific service of national significance while striving to find scientific solutions for major social challenges. More information: http://www.leibniz-gemeinschaft.de/
For more information visit: http://dx.doi.org/10.1098/rspb.2014.1470
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