Patterns and processes in microbial biogeography: do molecules and morphologies give the same answers?

ISME Journal - Tập 10 Số 7 - Trang 1779-1790 - 2016
Luciana F. Santoferrara1, Jean‐David Grattepanche2, Laura A. Katz2,3, George B. McManus1
1Department of Marine Sciences, University of Connecticut, Groton, CT, USA
2Department of Biological Sciences, Smith College, Northampton, MA, USA
3Program in Organismic and Evolutionary Biology, University of Massachusetts , Amherst, MA, USA

Tóm tắt

Abstract Our knowledge on microbial biogeography depends on the way we define and study diversity. In contrast to most microbes, some protist lineages have conspicuous structures that allow comparisons of diversity concepts and measures—those based on molecules and those based on morphology. We analyzed a group of shell-bearing planktonic ciliates, the tintinnids, in a coast-to-ocean gradient using high-throughput sequencing and microscopy. First, we compared molecular operational taxonomic units (OTUs) and morphospecies in terms of assemblage composition, distribution and relationships with the environment. OTUs revealed potentially novel and rare taxa, while morphospecies showed clearer correlations with environmental factors, and both approaches coincided in supporting a coastal versus oceanic pattern. Second, we explored which processes influence assembly across the environmental gradient examined. Assemblage fluctuations were associated with significant distance–decay and changes in morphospecies size and prey proxies, thus suggesting niche partitioning as a key structuring mechanism. Our conclusion is that molecules and morphologies generally agreed, but they provided complementary data, the first revealing hidden diversity, and the latter making better connections between distribution patterns and ecological processes. This highlights the importance of linking genotypes and phenotypes (using multidisciplinary analyses and/or reliable databases of barcoded species), to understand the diversity, biogeography and ecological roles of microbes.

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ISME Journal

Tập 10 Số 7

1779-1790

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