Located on mid-ocean ridges, hot vent ecosystems are characterized by extreme environments and unique organisms, which don't depend on sunlight - a rare feat! Photosynthesis is the way plants convert energy to food, but deep-sea hydrothermal vent communities are sustained by a special group of microorganisms, which carry out a process known as chemosynthesis. This allows the bacteria and archaea to produce organic matter for themselves and the animals using energy from chemical reactions that occur as hot vent fluids mix with seawater. Several studies have shown that the distribution of vent communities and their composition are strongly influenced by local geological, physical and chemical processes. We know very little about the day-to-day life of hydrothermal vent organisms or how these particular ecosystems evolve over time as a result of the various processes affecting them.
During the last few years, engineering and science teams at Ifremer, France's national public institute for marine research have developed Tempo-Mini: a custom-designed instrument package for real-time monitoring of hydrothermal vent communities and their environment. Tempo-Mini integrates the following custom instrumentation:
- 2 megapixel streaming video camera with embedded event detection;
- 6 LED lights;
- Aanderaa oxygen optode (used to measure oxygen concentrations as well as temperatures between 0 and 40°C);
- 10m-long, 10-sensor temperature probe array;
- CHEMINI Fe iron concentration chemical analyzer.
To keep Tempo-Mini clean, an efficient and innovative anti-biofouling system protects the camera porthole, lights, and optical oxygen sensor. Tempo-Mini is remotely controlled by researchers in France via the Internet. Software at our Port Alberni shore station acquires the data and keeps all the measurements in order.
In 2008, Ifremer collaborated with NEPTUNE and VENUS networks to collect live data from the seafloor in Saanich Inlet near Sidney, BC. After this 5-month test in relatively shallow water (100m), Tempo-Mini was recovered in February 2009. In September 2011, an updated version (Auffret et al., 2010) was connected to the NEPTUNE observatory. Its principal objective is to gather the data needed to describe how physical, geological and chemical variations influence the structure and growth of hydrothermal communities at Endeavour vent field in the northeast Pacific Ocean.