Population dynamics and the stability of obligate pollination mutualisms

dc.contributor.authorHolland, J. Nathanielen_US
dc.contributor.authorDeAngelis, Donald L.en_US
dc.date.accessioned2008-09-18T19:14:47Zen_US
dc.date.available2008-09-18T19:14:47Zen_US
dc.date.issued2001en_US
dc.descriptionjournal articleen_US
dc.description.abstractMutualistic interactions almost always produce both costs and benefits for each of the interacting species. It is the difference between gross benefits and costs that determines the net benefit and the per-capita effect on each of the interacting populations. For example, the net benefit of obligate pollinators, such as yucca and senita moths, to plants is determined by the difference between the number of ovules fertilized from moth pollination and the number of ovules eaten by the pollinator’s larvae. It is clear that if pollinator populations are large, then, because many eggs are laid, costs to plants are large, whereas, if pollinator populations are small, gross benefits are low due to lack of pollination. Even though the size and dynamics of the pollinator population are likely to be crucial, their importance has been neglected in the investigation of mechanisms, such as selective fruit abortion, that can limit costs and increase net benefits. Here, we suggest that both the population size and dynamics of pollinators are important in determining the net benefits to plants, and that fruit abortion can significantly affect these. We develop a model of mutualism between populations of plants and their pollinating seed-predators to explore the ecological consequences of fruit abortion on pollinator population dynamics and the net effect on plants. We demonstrate that the benefit to a plant population is unimodal as a function of pollinator abundance, relative to the abundance of flowers. Both selective abortion of fruit with eggs and random abortion of fruit, without reference to whether they have eggs or not, can limit pollinator population size. This can increase the net benefits to the plant population by limiting the number of eggs laid, if the pollination rate remains high. However, fruit abortion can possibly destabilize the pollinator population, with negative consequences for the plant population.en_US
dc.description.sponsorshipNSFen_US
dc.identifier.urihttps://hdl.handle.net/1911/21703en_US
dc.language.isoengen_US
dc.publisherSpringer-Verlagen_US
dc.subjectmutualismen_US
dc.subjectcostsen_US
dc.subjectfunctional responseen_US
dc.subjectbenefitsen_US
dc.subjectfruit abortionen_US
dc.titlePopulation dynamics and the stability of obligate pollination mutualismsen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
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