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Early burst in body size evolution is uncoupled from species diversification in diving beetles (Dytiscidae)
Swedish Museum of Natural History, Department of Zoology. (Bergsten Systematic Entomology Lab)ORCID iD: 0000-0003-1922-3557
University of New Mexico.
Swedish Museum of Natural History, Department of Zoology. (Bergsten Systematic Entomology Lab)
2018 (English)In: Molecular Ecology, ISSN 0962-1083, E-ISSN 1365-294X, Vol. 27, no 4, p. 979-993Article in journal (Refereed) Published
Abstract [en]

Changes in morphology are often thought to be linked to changes in species diversification,

which is expected to leave a signal of early burst (EB) in phenotypic traits.

However, such signal is rarely recovered in empirical phylogenies, even for groups

with well-known adaptive radiation. Using a comprehensive phylogenetic approach

in Dytiscidae, which harbours ~4,300 species with as much as 50-fold variation in

body size among them, we ask whether pattern of species diversification correlates

with morphological evolution. Additionally, we test whether the large variation in

body size is linked to habitat preference and whether the latter influences species

turnover. We found, in sharp contrast to most animal groups, that Dytiscidae body

size evolution follows an early-burst model with subsequent high phylogenetic conservatism.

However, we found no evidence for associated shifts in species diversification,

which point to an uncoupled evolution of morphology and species

diversification. We recovered the ancestral habitat of Dytiscidae as lentic (standing

water), with many transitions to lotic habitat (running water) that are concomitant

to a decrease in body size. Finally, we found no evidence for difference in net diversification

rates between habitats nor difference in turnover in lentic and lotic species.

This result, together with recent findings in dragonflies, contrasts with some

theoretical expectations of the habitat stability hypothesis. Thus, a thorough

reassessment of the impact of dispersal, gene flow and range size on the speciation

process is needed to fully encompass the evolutionary consequences of the lentic–

lotic divide for freshwater fauna.

Place, publisher, year, edition, pages
2018. Vol. 27, no 4, p. 979-993
Keywords [en]
body size, divergence time, early burst, habitat, insect, phylogeny
National Category
Biological Systematics Evolutionary Biology Zoology
Research subject
Diversity of life
Identifiers
URN: urn:nbn:se:nrm:diva-3082DOI: 10.1111/mec.14492OAI: oai:DiVA.org:nrm-3082DiVA, id: diva2:1269222
Funder
Swedish Research CouncilAvailable from: 2018-12-10 Created: 2018-12-10 Last updated: 2018-12-14Bibliographically approved

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Publisher's full texthttps://doi.org/10.1111/mec.14492

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