Biology ETDs
Publication Date
Fall 11-15-2022
Abstract
Quantifying the flow of energy and nutrients through food webs is foundational to understanding the structure and function of ecosystems. Here, I utilize the stable carbon and nitrogen isotope analysis of individual amino acids to trace the movement of essential amino acids through terrestrial and freshwater food webs in New Mexico, USA. I first explore isotopic patterns among co-occurring terrestrial plants and aquatic algae. I then combine this molecular isotopic approach with 16S and 18S rRNA sequencing to demonstrate the importance of gut microbiota as sources of essential amino acids to wild mammalian hosts. Next, I explore the roles of microbial biofilms in facilitating terrestrial resource use by aquatic macroinvertebrates. I find that terrestrial riparian plant species greatly influences microbial biofilm diversity and composition and macroinvertebrate feeding habits. My work emphasizes the importance of microbes in facilitating the consumption and decomposition of recalcitrant terrestrial plants.
Project Sponsors
National Science Foundation Graduate Research Fellowship Program (Grant No. 1939267)
Language
English
Keywords
carbon, stable isotopes, amino acids, food webs, gut microbiome, aquatic microbial biofilms
Document Type
Dissertation
Degree Name
Biology
Level of Degree
Doctoral
Department Name
UNM Biology Department
First Committee Member (Chair)
Seth D. Newsome
Second Committee Member
Cristina D. Takacs-Vesbach
Third Committee Member
Thomas F. Turner
Fourth Committee Member
Jane C. Marks
Recommended Citation
Besser, Alexi Christina. "Combining isotopic and genetic analyses to quantify microbial facilitation of recalcitrant resource use by terrestrial and aquatic consumers." (2022). https://digitalrepository.unm.edu/biol_etds/420
Included in
Biology Commons, Environmental Microbiology and Microbial Ecology Commons, Terrestrial and Aquatic Ecology Commons