Abstract
The sequestration by neotropical poison frogs (Dendrobatidae) of an amazing array of defensive alkaloids from oribatid soil mites has motivated an exciting research theme in chemical ecology, but the details of mite-to-frog transfer remain hidden. To address this, McGugan et al. (2016, Journal of Chemical Ecology 42:537–551) used the little devil poison frog (Oophaga sylvatica) and attempted to simultaneously characterize the prey mite alkaloids, the predator skin alkaloids, and identify the mites using DNA sequences. Heethoff et al. (2016, Journal of Chemical Ecology 42:841–844) argued that none of the mite families to which McGugan et al. allocated the prey was thought to possess alkaloids. Heethoff et al. concluded from analyses including additional sequences that the mite species were unlikely to be close relatives of the defended mites. We re-examine this by applying more appropriate phylogenetic methods to broader and denser taxonomic samples of mite sequences using the same gene (CO1). We found, over trees based on CO1 datasets, only weak support (except in one case) for branches critical to connecting the evolution of alkaloid sequestration with the phylogeny of mites. In contrast, a well-supported analysis of the 18S ribosomal gene suggests at least two independent evolutionary origins of oribatid alkaloids. We point out impediments in the promising research agenda, namely a paucity of genetic, chemical, and taxonomic information, and suggest how phylogenetics can elucidate at a broader level the evolution of chemical defense in prey arthropods, sequestration by predators, and the impact of alkaloids on higher-order trophic interactions.
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We are grateful to Analisa Shields-Estrada for comments on early versions of the manuscript and to two anonymous reviewers for valuable feedback and comments on an earlier manuscript draft.
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JLC and DCC were supported by a grant from the National Science Foundation (NSF DEB-1556967).
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Coleman, J.L., Cannatella, D.C. How Phylogenetics Can Elucidate the Chemical Ecology of Poison Frogs and Their Arthropod Prey. J Chem Ecol 48, 384–400 (2022). https://doi.org/10.1007/s10886-022-01352-8
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DOI: https://doi.org/10.1007/s10886-022-01352-8