Yuccas, yucca moths, and coevolution: A review

By O. Pellmyr. 2003

352 citations recorded by the source corpus.

The obligate pollination mutualism between yuccas (Agavaceae) and yucca moths (Lepidoptera, Prodoxidae), in which the adult moth pollinates yucca flowers and her progeny feed on developing seeds, is one of the classically cited examples of coevolution. While known since 1872, our understanding of the ecology and evolution of this association has increased dramatically in the past decade. Here I review current information on organismal diversity and phylogenetic relationships, ecological relationships, origin and reversal of the mutualism, and the potential for analyzing patterns of co-speciation and the historical role of coevolution on specific traits in driving diversification in the interaction. Major novel developments in recent years include the recognition of a large species complex of pollinators, previously thought to be one polyphagous species; a majority of all moth species are monophagous. Considerable life history diversity has been unveiled, and mechanisms that maintain a mutualistic equilibrium by preventing overexploitation documented. Phylogenetic and ecological information, including data from other, newly discovered facultative pollinators in the Prodoxidae, have been used to erect a hypothesis for the evolution of obligate mutualism. Application of a molecular clock to phylogenetic data suggests that the plant-moth association arose at least 40 Mya, and that the obligate mutualism evolved very quickly after this event. Two separate events of reversal of mutualism have been identified, involving derived ‘‘cheater’’ moth species that oviposit into fruits resulting from pollination by other pollinator species. This appears to have happened not through selection for cheating, but rather as a byproduct of a phenological shift to an unexploited seed resource, in which case pollination behavior became redundant. Analyses of parallel diversification and character coevolution are hampered by incomplete phylogenetic information at the species level, especially for the plants, but also for the pollinators. Available data indicate considerable deviation from strict co-speciation, and no evident examples of this process. Analyses of the role of coevolutionary processes in driving the diversification of yuccas and yucca moths will be possible once fully resolved phylogenies become available.

Subfields: Ecology, Ecology, Evolution, Behavior and Systematics, Nature and Landscape Conservation

View Paper: https://www.semanticscholar.org/paper/12e2df25aeb6bd1b2c3585465bcbcddc12badd41

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Citations in the corpus

A molecular phylogeny for the oldest (nonditrysian) lineages of extant Lepidoptera, with implications for classification, comparative morphology and life‐history evolution (2015, background): “This case is often presented as a textbook example of coevolution (Thompson, 2005), although the data do not provide evident examples of co-speciation (Pellmyr, 2003).”
Floral scents: their roles in nursery pollination mutualisms (2010, background): “Among these mutualisms, the most diverse and wellknown examples are the interactions between figs and fig wasps (Anstett et al. 1997; Cook and Rasplus 2003; Herre et al. 2008) and those between yuccas and yucca moths ( Pellmyr 2003 ).”
The specialization continuum in pollination systems: diversity of concepts and implications for ecology, evolution and conservation (2017, background): “nursery mutualisms, for example the pollen-collecting tentacles of yucca moths (Pellmyr 2003) and pollen-storing concavities of fig wasps (Ram ırez 1969).”
ATTRACTING ANTAGONISTS: DOES FLORAL NECTAR INCREASE LEAF HERBIVORY? (2004, background): “The first of these involves pollinators with offspring that consume seeds; the best studied are the mutualisms between figs and fig wasps and between yuccas and yucca moths (e.g., Cook and Rasplus 2003, Dufaÿ and Anstett 2003, Pellmyr 2003).”