Host Plant and Spatial Influences on the Natural Enemy Community Structure of a Host Specific Insect Herbivore

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dc.contributor.advisorOtt, James
dc.contributor.authorBusbee, Robert Waid
dc.contributor.committeeMemberNice, Chris
dc.contributor.committeeMemberMartin, Noland
dc.date.accessioned2020-05-27T21:22:24Z
dc.date.available2020-05-27T21:22:24Z
dc.date.issued2018-05
dc.description.abstractBoth environmental variation and spatial autocorrelation play roles in structuring communities at all spatial scales. However, untangling the respective contributions of these sources of variation represents a long-standing, complex, and methodologically ever-evolving question for community ecology. Here I investigate the structure of the insect natural enemy community centered on galls produced by Belonocnema treatae (Hymenoptera: Cynipidae) on the leaves of its host plants across the gall former's geographic range while controlling for spatial autocorrelation among sample sites. Belonocnema treatae exhibits regional host plant specialization across the southern US on three live oak species, Quercus fusiformis (Qf), Quercus virginiana (Qv), and Quercus geminata (Qg). I sampled the natural enemy community at 94 sites by rearing natural enemies that emerged from galls collected at each site. I identified 32,722 natural enemies representing ≥30 taxa from 126,812 galls. I hypothesized that richness and diversity on Qv would exceed that on Qf and Qg since the geographic range of Qv bridges that of Qf to the west and Qg to the east. Contrary to my hypothesis one-way ANOVA followed by a Tukey’s HSD showed that both richness and Shannon-Wiener diversity was greatest on Qf. To disentangle the role of host plant affiliation from spatial autocorrelation among sample sites I conducted a Redundancy Analysis (RDA). I first used Principal Coordinates of Neighbor Matrices (PCNM) to generate explanatory variables representing orthogonal aspects of spatial structure within the sampling frame. The set of PCNM vectors that were significantly correlated with community structure were then included in a RDA along with the host plant species from which each natural enemy was reared to examine the respective roles of host plant association and spatial structure in determining abundance and species composition of the natural enemy community. This study establishes a significant role for both alternative host plants and geography in structuring the diversity of the natural enemy community of B. treatae and illustrates the advantages of the PCNM & RDA approach.
dc.description.departmentBiology
dc.formatText
dc.format.extent74 pages
dc.format.medium1 file (.pdf)
dc.identifier.citationBusbee, R. W. (2018). Host plant and spatial influences on the natural enemy community structure of a host specific insect herbivore (Unpublished thesis). Texas State University, San Marcos, Texas.
dc.identifier.urihttps://hdl.handle.net/10877/10322
dc.language.isoen
dc.subjectconservation biology
dc.subjectecology
dc.subjecthost plants
dc.titleHost Plant and Spatial Influences on the Natural Enemy Community Structure of a Host Specific Insect Herbivore
dc.typeThesis
thesis.degree.departmentBiology
thesis.degree.disciplinePopulation and Conservation Biology
thesis.degree.grantorTexas State University
thesis.degree.levelMasters
thesis.degree.nameMaster of Science

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