Award Date
May 2018
Degree Type
Thesis
Degree Name
Master of Science (MS)
Department
Life Sciences
First Committee Member
Daniel Thompson
Second Committee Member
Allen Gibbs
Third Committee Member
Javier Rodriguez
Fourth Committee Member
Ronald Gary
Number of Pages
64
Abstract
Butterflies are a diverse and essential group of pollinators whose abundance is predominantly determined by growth and survival of their larvae. In the family Lycaenidae, many species participate in a larval-ant mutualism where ants feed on nutrient-rich nectar produced by larvae and, in turn, protect those larvae from predators. Emerging evidence indicates larval scent in the form of cuticular hydrocarbons (CHCs), not nectar production, drives this interaction. This study takes two approaches to investigate CHCs as the driver behind the larval-ant mutualism in three butterfly species native to southern Nevada: Euphilotes bernardino martini (Martin’s blue), Brephidium exilis (western pygmy blue), and Euphilotes ancilla (Rocky Mountain dotted blue). First, behavioral assays are conducted to investigate larval-ant interactions in early and late larval instars both with live larvae and beads coated in larval extract. Second, the general composition of hydrocarbons found on the larval cuticles of these mutualist species is identified along with those from four species of attendant ants (Forelius pruinosus, Camponotus spp, Crematogaster mormonum, and Linepithema humile) to determine how varying CHC composition may be implicated in initiating and maintaining this important mutualism. In addition, this study addresses the novel hypothesis that early instar larvae produce a simple CHC suite to avoid ant aggression and then, in late instars, switch to producing a complex CHC suite that encourages ant interaction. This study finds partial support for CHC overlap in mutualist larvae and ants but does not find support for a developmental shift in CHC production.
Keywords
inter-species communication; mutualism breakdown; Polyommatinae
Disciplines
Environmental Sciences | Terrestrial and Aquatic Ecology
File Format
Degree Grantor
University of Nevada, Las Vegas
Language
English
Repository Citation
Mellor, Alicia, "Larval-Ant Interactions in the Mojave Desert: Communication Brings Us Together" (2018). UNLV Theses, Dissertations, Professional Papers, and Capstones. 3291.
http://dx.doi.org/10.34917/13568598
Rights
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