ArticleISME communications2026
Niche divergence suggests ecophysiological differences between cryptic phytoplankton species.
Article in ISME communications, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Species-based ecology is fundamental to understanding and predicting the role of phytoplankton diversity in the production and biogeochemical cycles of marine ecosystems. However, microscopy fails to distinguish genetically distinct but morphologically identical (cryptic) or near-identical (pseudocryptic) species, which are lumped into species complexes under the assumption that they have similar ecological characteristics. To test this hypothesis, we analysed a 12-year V4-18S rDNA metabarcoding dataset (168 dates) from the Long-Term Ecological Research Site MareChiara (Gulf of Naples, Mediterranean Sea). Using Kernel Density Estimations and Outlying Mean Index niche analysis, we investigated the seasonality and ecology of 33 cryptic and pseudocryptic species or genetic variants, identified as amplicon sequence variants (ASVs). These belonged to eight species complexes, selected based on their abundance and frequency, within the diatoms
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