Microsensors were mounted on a motorized micromanipulator (MUX2, PyroScience GmbH) and connected to custom-built millivolt meters (Max Planck Institute for Marine Microbiology, Bremen, Germany). Amplifier outputs were channeled through an interface (Dual Channel Reader DCR16, PyroScience GmbH) to a laptop for data acquisition and control of the micromanipulator using the software Profix (version 4.51; PyroScience GmbH). Simultaneous use of two microsensors was facilitated by a custom-built adapter and a twin clamp (MM-TC, PyroScience GmbH). With the exception of one experiment where microsensor signals were recorded every 5 s (see below), microsensor signals were recorded every 2 s.

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