Bacterial taxa-area and distance-decay relationships in marine environments.
Bottom Line: Noticeably, bacterial TAR and DDR patterns did not correlate with each other both within and across ecosystem types, suggesting that (i) TAR cannot be directly derived from DDR and (ii) TAR and DDR may be influenced by different ecological factors.Nevertheless, we found marine bacterial TAR and DDR to be steeper in ecosystems associated with high environmental heterogeneity or spatial isolation, namely marine sediments and coastal environments compared with pelagic ecosystems.Hence, our study provides information on macroecological patterns of marine bacteria, as well as methodological and conceptual insights, at a time when biodiversity surveys increasingly make use of high-throughput sequencing technologies.
Affiliation: HGF-MPG Joint Research Group on Deep Sea Ecology and Technology, Max Planck Institute for Marine Microbiology, Celsiusstrasse 1, Bremen, D-28359, Germany; CNRS, Université Paul Sabatier, UMR5174 EDB, 118 route de Narbonne, Toulouse, F-31062, France.Show MeSH
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Mentions: We first examined the effects of the removal of rare taxa on the intrinsic structure of bacterial communities associated with the aforementioned case-studies ecosystems (Fig. S2, Supporting information): this resulted in a complete OTU impoverishment in several samples that were therefore excluded from the analysis (Fig. S2a, Supporting information), but it did not noticeably change the overall distribution of pairwise geographic distances between samples (Fig. S2b–d, Supporting information). Removing taxa of increasing abundance also affected the average proportion of sites occupied by each OTU, which increased in surface- and deep-sea waters (Fig. S2h, Supporting information), but tended to decrease in coastal sediments. The proportion of OTUs of the total OTU richness detected in the smallest area was affected by the removal of rare taxa mostly in surface-sea waters and coastal sediments (Fig. S2i, Supporting information). Rare taxa removal also tended to maximize regional community similarities (samples <2000 km apart) and strongly minimized similarities between geographically distant communities (samples >12 000 km apart), especially in pelagic ecosystems (Fig. S2j–l, Supporting information).
Affiliation: HGF-MPG Joint Research Group on Deep Sea Ecology and Technology, Max Planck Institute for Marine Microbiology, Celsiusstrasse 1, Bremen, D-28359, Germany; CNRS, Université Paul Sabatier, UMR5174 EDB, 118 route de Narbonne, Toulouse, F-31062, France.