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FLORAL COLOR ASSEMBLY OF SERPENTINE SEEP COMMUNITIES IN NORTHERN CALIFORNIA, USA

LeCroy, Kathryn A. (2015) FLORAL COLOR ASSEMBLY OF SERPENTINE SEEP COMMUNITIES IN NORTHERN CALIFORNIA, USA. Master's Thesis, University of Pittsburgh. (Unpublished)

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Abstract

Species traits, particularly those that impact fitness, can shape the evolutionary relationships among coexisting species. Trait distribution (underdispersion, overdispersion) within communities can provide evidence of key ecological interactions (e.g., competition, facilitation) that can contribute to assembly. The distribution of floral colors in a community may reflect pollinator-mediated interactions, and the phylogenetic distribution of color can also affect inferences of ecological mechanisms at play. Additionally, the scale of local habitat may influence the type or strength of ecological interactions among co-occurring species. I examined how floral color is distributed within replicated co-flowering assemblages with the use of pollinator color vision models. Incorporating these biologically relevant models into the study of floral color assembly processes is relatively new and untested for an entire co-flowering community with generalist pollinators. I modeled floral spectra of 55 co-flowering species through honeybee and syrphid fly color vision to assess color trait structure across 14 serpentine seep communities in California. I then compared our findings to null model predictions. We asked: is there evidence for nonrandom distribution of floral color in the community? Is there phylogenetic signal for floral color? If so, is there phylogenetic underdispersion or overdispersion across local communities? Is there an effect of habitat scale on these outcomes? I found that the observed color assemblage is not due to any phylogenetic history, and there is no phylogenetic signal for the selected floral color metric. I found a significant negative relationship between habitat scale and trait dispersion. Competitive exclusion could be a dominant interaction outcome at small scales, but it is less detectable/unimportant at larger scales.


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Details

Item Type: University of Pittsburgh ETD
Status: Unpublished
Creators/Authors:
CreatorsEmailPitt UsernameORCID
LeCroy, Kathryn A.kal142@pitt.eduKAL1420000-0001-8819-3350
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairAshman, Tia-Lynntia1@pitt.eduTIA1
Committee MemberKalisz, Susankalisz@pitt.eduKALISZ
Committee MemberPruitt, Jonathanpruittj@pitt.eduPRUITTJ
Committee MemberTonsor, Stephen Jtonsor@pitt.eduTONSOR
Date: 9 January 2015
Date Type: Publication
Defense Date: 7 November 2014
Approval Date: 9 January 2015
Submission Date: 4 December 2014
Access Restriction: 5 year -- Restrict access to University of Pittsburgh for a period of 5 years.
Number of Pages: 39
Institution: University of Pittsburgh
Schools and Programs: Dietrich School of Arts and Sciences > Biological Sciences
Degree: MS - Master of Science
Thesis Type: Master's Thesis
Refereed: Yes
Uncontrolled Keywords: floral color, pollination, ecology, Apis mellifera, Eristalis tenax, serpentine, insect vision, chromatic contrast
Date Deposited: 09 Jan 2015 18:31
Last Modified: 15 Nov 2016 14:25
URI: http://d-scholarship.pitt.edu/id/eprint/23757

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