Effects of Urbanization and Landscape on Gut Microbiomes in White-Crowned Sparrows

• Published in: Microbial ecology Vol. 81; no. 1; pp. 253 - 266
• Main Authors: Berlow, Mae, Phillips, Jennifer N., Derryberry, Elizabeth P.
• Format: Journal Article
• Language: English
• Published: New York Springer US 2021; Springer Nature B.V
• Subjects: Avian physiology; Biomedical and Life Sciences; Body size; Digestive system; Divergence; Ecology; Environmental effects; Environmental factors; Environmental stress; Food availability; Food supply; Geoecology/Natural Processes; Host Microbe Interactions; Intestinal microflora; Land cover; Life Sciences; Microbial activity; Microbial Ecology; Microbiology; Microbiomes; Microbiota; Microorganisms; Morphology; Nature Conservation; Noise levels; Physical characteristics; Physiology; Populations; Rural areas; Rural communities; Rural environments; Rural populations; Urban areas; Urban noise; Urban populations; Urbanization; Water Quality/Water Pollution; Urbanization; Physiology; Gut microbiome; Bird; White-crowned sparrow
• ISSN: 0095-3628; 1432-184X
• DOI: 10.1007/s00248-020-01569-8

Habitats are changing rapidly around the globe and urbanization is one of the primary drivers. Urbanization changes food availability, environmental stressors, and the prevalence of disease for many species. These changes can lead to divergence in phenotypic traits, including behavioral, physiological, and morphological features between urban and rural populations. Recent research highlights that urbanization is also changing the gut microbial communities found in a diverse group of host species. These changes have not been uniform, leaving uncertainty as to how urban habitats are shaping gut microbial communities. To better understand these effects, we investigated the gut bacterial communities of White-Crowned Sparrow ( Zonotrichia leucophrys ) populations along an urbanization gradient in the San Francisco Bay area. We examined how gut bacterial communities vary with the local environment and host morphological characteristics. We found direct effects of environmental factors, including urban noise levels and territory land cover, as well as indirect effects through body size and condition, on alpha and beta diversity of gut microbial communities. We also found that urban and rural birds’ microbiomes differed in which variables predicted their diversity, with urban communities driven by host morphology, and rural communities driven by environmental factors. Elucidating these effects provides a better understanding of how urbanization affects wild avian physiology.