Stanford Advisors


All Publications


  • Land-use change has host-specific influences on avian gut microbiomes. The ISME journal San Juan, P. A., Hendershot, J. N., Daily, G. C., Fukami, T. 2019

    Abstract

    Human modification of the environment, particularly through land-use change, often reduces animal species diversity. However, the effect of land-use change on the gut microbiome of wildlife in human-dominated landscapes is not well understood despite its potential consequences for host health. We sought to quantify the effect of land-use change on wild bird gut microbiomes in a countryside landscape in Costa Rica, comprising a range of habitat types, ranging from primary and secondary forests to diversified and monoculture farms. We collected 280 fresh fecal samples from individuals belonging to six common species of saltator, thrushes, and warblers at 24 sites across this land-use gradient. Through 16S rRNA community profiling, we found that bacterial species composition responded to host species identity more strongly than to habitat type. In addition, we found evidence that habitat type affected microbial composition only for two of the six bird species. Our findings indicate that some host species and their microbiota may be more vulnerable to human disturbances than others.

    View details for DOI 10.1038/s41396-019-0535-4

    View details for PubMedID 31624349

  • A global test of ecoregions (vol 2, pg 1889, 2018) NATURE ECOLOGY & EVOLUTION Smith, J. R., Letten, A. D., Ke, P., Anderson, C. B., Hendershot, J., Dhami, M. K., Dlott, G. A., Grainger, T. N., Howard, M. E., Morrison, B. L., Routh, D., San Juan, P. A., Mooney, H. A., Mordecai, E. A., Crowther, T. W., Daily, G. C. 2019; 3 (4): 708
  • Author Correction: A global test of ecoregions. Nature ecology & evolution Smith, J. R., Letten, A. D., Ke, P., Anderson, C. B., Hendershot, J. N., Dhami, M. K., Dlott, G. A., Grainger, T. N., Howard, M. E., Morrison, B. M., Routh, D., Juan, P. A., Mooney, H. A., Mordecai, E. A., Crowther, T. W., Daily, G. C. 2019

    Abstract

    The original paper was published without unique DOIs for GBIF occurrence downloads. These have now been inserted as references 70-76, and the error has been corrected in the PDF and HTML versions of the article.

    View details for PubMedID 30858593

  • A global test of ecoregions. Nature ecology & evolution Smith, J. R., Letten, A. D., Ke, P., Anderson, C. B., Hendershot, J. N., Dhami, M. K., Dlott, G. A., Grainger, T. N., Howard, M. E., Morrison, B. M., Routh, D., San Juan, P. A., Mooney, H. A., Mordecai, E. A., Crowther, T. W., Daily, G. C. 2018

    Abstract

    A foundational paradigm in biological and Earth sciences is that our planet is divided into distinct ecoregions and biomes demarking unique assemblages of species. This notion has profoundly influenced scientific research and environmental policy. Given recent advances in technology and data availability, however, we are now poised to ask whether ecoregions meaningfully delimit biological communities. Using over 200 million observations of plants, animals and fungi we show compelling evidence that ecoregions delineate terrestrial biodiversity patterns. We achieve this by testing two competing hypotheses: the sharp-transition hypothesis, positing that ecoregion borders divide differentiated biotic communities; and the gradual-transition hypothesis, proposing instead that species turnover is continuous and largely independent of ecoregion borders. We find strong support for the sharp-transition hypothesis across all taxa, although adherence to ecoregion boundaries varies across taxa. Although plant and vertebrate species are tightly linked to sharp ecoregion boundaries, arthropods and fungi show weaker affiliations to this set of ecoregion borders. Our results highlight the essential value of ecological data for setting conservation priorities and reinforce the importance of protecting habitats across as many ecoregions as possible. Specifically, we conclude that ecoregion-based conservation planning can guide investments that simultaneously protect species-, community- and ecosystem-level biodiversity, key for securing Earth's life support systems into the future.

    View details for PubMedID 30397301