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. 2020 Oct 23;11:575194. doi: 10.3389/fmicb.2020.575194

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Copyright © 2020 Gifford, Zhao, Stemple, DeLong, Medeiros, Seim and Marchetti.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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The Galápagos Archipelago lies at the intersection of several ocean currents which create a diversity of marine habitats around the islands. (A) Map of the Galápagos platform with sampling locations marked in red and probable current flows of the South Equatorial Current (SEC, yellow arrows) and Equatorial Under Current (EUC, white arrows). (B) Location of the Galápagos Archipelago in the Pacific Ocean. (C) Chlorophyll a concentration from satellite observations (Aqua/MODIS). (D) Genovesa Island and sampling Site 14 within the partially collapsed caldera that is now Darwin bay. (E) Mixed layer temperate, salinity, inorganic nutrient, size-fractionated chl a, and primary productivity (determined by DIC uptake) data, and microbial abundances at sampled stations in 2015 and 2016. Sample site IDs are shown on the left, corresponding with IDs in (A) and divided into four main geographical regions. Microbial abundances are based on single-copy gene (recA) recovery from the metagenomes normalized to internal standard recovery.