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The adaptive significance of insect gall distribution: survivorship of species in xeric and mesic habitats

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Summary

We studied the relationship between habitat moisture and gall-forming insect populations. Population sizes for most galling taxa were significantly larger in xeric habitats compared with mesic habitats. Our results indicate that the differential abundance of galling insects in these habitats is due primarily to differential mortality and survivorship. Mortality factors acting upon eight insect galling species (belonging to eight genera and four families) were measured on six species (five genera and five families) of host plants. Survival was significantly higher for galling populations inhabiting xeric habitats compared with mesic habitats. Parasitism was higher in mesic habitats in seven of eight habitats and fungus-induced diseases were higher in five of seven habitats. Mortality due to predation and other (unknown) factors showed no clear trends. Overall, there was a tendency towards lower mortality and consequently higher survival for populations inhabiting xeric habitats. We hypothesize that reduced mortality caused by natural enemies and endophytic fungi has contributed to the speciation and radiation of galling insects in apparently harsh environments.

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  1. G. Wilson Fernandes

    Present address: Departmento de Biologia Geral, ICB/Universidade Federal de Minas Gerais, CP 2486, 30161, Belo Horizonte, MG, Brazil

Authors and Affiliations

  1. Department of Biological Sciences, Northern Arizona University, Box 5640, 86011, Flagstaff, AZ, USA

    G. Wilson Fernandes & Peter W. Price

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  1. G. Wilson Fernandes
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Fernandes, G.W., Price, P.W. The adaptive significance of insect gall distribution: survivorship of species in xeric and mesic habitats. Oecologia 90, 14–20 (1992). https://doi.org/10.1007/BF00317803

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