A comparative approach to understanding factors limiting abundance patterns and distributions in a fig tree–fig wasp mutualism

dc.contributor.authorWarren, Marie
dc.contributor.authorRobertson, Mark P.
dc.contributor.authorGreeff, Jacobus Maree
dc.date.accessioned2011-09-07T11:10:08Z
dc.date.available2011-09-07T11:10:08Z
dc.date.issued2010-02
dc.description.abstractNumerous factors affect distribution and abundance. Due to their intimate host association, pollinating fig wasps are expected to occupy the entire distribution of their host fig. An understanding of the physiology of fig wasp species and the factors affecting adult survival are important for understanding and explaining wasp abundance and distribution patterns. We examine distribution and abundance patterns of a fig tree fig wasp system in which the non-pollinator (Ceratosolen galili ) has been reported to be rarer than the pollinator (Ceratosolen arabicus) in drier areas due to lower desiccation tolerance. Both species are closely related and utilise the same oviposition sites on Ficus sycomorus. We used ecological niche modelling to determine whether C. galili covers the range of F. sycomorus and whether it is consistently rarer than C. arabicus. We examined emergence times, critical thermal limits, desiccation and starvation tolerances of the wasps. The suggested rarity of C. galili relates to lower abundance in certain months and at certain localities but a similar number of occurrence records within the distributional range (except in arid regions, e.g. Namibia). In contrast to C. galili, C. arabicus has a wider thermal range, lives longer under hydrating and dehydrating conditions and is a nocturnal flier. The synergistic effect of physiological tolerances and flight time differences exacerbate the less favourable conditions available to C. galili during flight and location of receptive figs. These factors enable C. arabicus to survive for longer than C. galili, meaning that they are more likely to disperse to trees that are flowering further away in space and time. Combining correlative and mechanistic approaches has aided us in understanding the ecological niches of these species.en
dc.description.sponsorshipThis work is supported by a National Research Foundation postdoctoral fellowship to MW and Grant number FA2007050800023 to JMG.en_US
dc.description.urihttp://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1600-0587en_US
dc.identifier.citationWarren, M, Robertson, MP & Greeff, JM 2010, 'A comparative approach to understanding factors limiting abundance patterns and distributions in a fig tree–fig wasp mutualism', Ecography, vol. 33, no. 1, pp. 148-158.en
dc.identifier.issn0906-7590 (print)
dc.identifier.issn1600-0587 (online)
dc.identifier.other10.1111/j.1600-0587.2009.06041.x
dc.identifier.urihttp://hdl.handle.net/2263/17236
dc.language.isoenen_US
dc.publisherWiley-Blackwellen_US
dc.rights© 2010 The Authors. Journal compilation © 2010 Ecography. The definite version is available at www.blackwell-synergy.com.en
dc.subjectFig tree-fig wasp mutualismen
dc.subjectAbundanceen
dc.subjectPlant distributionen
dc.subjectIntimate hosten
dc.subject.lcshFig waspen
dc.subject.lcshMutualism (Biology)en
dc.titleA comparative approach to understanding factors limiting abundance patterns and distributions in a fig tree–fig wasp mutualismen
dc.typePostprint Articleen

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