10.5061/DRYAD.1904
Bocak, Ladislav
Palacký University, Olomouc
Malohlava, Vladimir
Palacký University, Olomouc
Data from: Evidence of extreme habitat stability in a Southeast Asian
biodiversity hotspot based on the evolutionary analysis of neotenic
net-winged beetles
Dryad
dataset
2010
Scarelus
Ateliinae
Lycidae
2010-08-26T15:46:53Z
2010-08-26T15:46:53Z
en
https://doi.org/10.1111/j.1365-294X.2010.04850.x
395536 bytes
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CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
The diversification of neotenic beetle lineages has not been studied,
despite the potential for defining biodiversity hotspots and elucidating
the history of regional faunas. Additionally, neotenics may provide
insight into the process of speciation in small populations with extremely
low dispersal ability and a limited range. Here, we used two rDNA and
three mtDNA markers to investigate the phylogeny of Scarelus, a neotenic
lineage endemic to Southeast Asian rainforests. Most genetic
differentiation was associated with Palaeogene geographic divisions, which
remain distinct despite temporary connections. Dispersal events were rare,
with only two inferred for Scarelus: from Borneo to the Philippines 28.3
million years ago (mya) and from Sumatra to Java 13.9 mya. The
reproductive isolation depended on allopatric range fragmentation, and
Scarelus diversified readily when conditions were favorable; in this case,
at different times in the eastern (19.3–39.1 mya) and western (3.5–13.9
mya) parts of Sundaland. The observed strong phenotypic similarity was
preserved under speciation through complete allopatry. Neotenic Lycidae
have survived for a long time in very stable habitats, and extremely low
dispersal activity has not limited their existence; however, the long-term
diversification rate of neotenics is low and diversification is
nonexistent under stable conditions. The modern ranges of neotenic
lineages are indicative of ancient rainforest refugia, and may be used in
biodiversity conservation management. Most neotenics are at risk of
extinction due to small ranges and a low dispersal potential.
ScarelusNEXUSMolEcolThe nexus matrices containing all sequences used for
the phylogenetic analysis
Southeast Asia