Abstract:
:We examine the extent to which phylogenetic effects and ecology are associated with macroevolutionary patterns of phytochemical defense production across the Mimulus phylogeny. We grew plants from 21 species representing the five major sections of the Mimulus phylogeny in a common garden to assess how the arsenals (NMDS groupings) and abundances (concentrations) of a phytochemical defense, phenylpropanoid glycosides (PPGs), vary across the phylogeny. Very few PPGs are widespread across the genus, but many are common to multiple sections of the genus. Phytochemical arsenals cluster among sections in an NMDS and are not associated with total concentration of PPGs. There is a strong phylogenetic signal for phytochemical arsenal composition across the Mimulus genus, while ecological variables such as growing season length, latitude, and elevation do not significantly influence arsenal. In contrast, there is little phylogenetic signal for total PPG concentration, and this trait is significantly influenced by several ecological factors. Phytochemical arsenals and abundances are influenced by plant life history form. Both phylogenetic effects and ecology are related to phytochemical patterns across species, albeit in different ways. The independence of phytochemical defense concentrations from arsenal compositions indicates that these aspects of defense may continue to evolve independently of one another.
journal_name
J Evol Bioljournal_title
Journal of evolutionary biologyauthors
Holeski LM,Keefover-Ring K,Sobel JM,Kooyers NJdoi
10.1111/jeb.13760subject
Has Abstractpub_date
2021-01-22 00:00:00eissn
1010-061Xissn
1420-9101pub_type
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