Instrument: Leggo Lander

Acronym:
External Identifier:

Description

The "Leggo Lander" is a lander system that primarily relies on syntactic foam for buoyancy and uses iridium GPS, radio signal, strobe light and flag for surface recovery, and acoustics for underwater monitoring and instrument control. The lander has a timer with 5 control settings for various operations. It routinely measures pressure (depth) throughout its dive and temperature on the seafloor. The lander payloads include a pressure-retaining seawater sampler plus 2 liter Niskin bottle, and a camera/battery/light system that also includes a 30 liter Niskin bottle and a sea cucumber trap. With the camera payload it travels down or up the water column at about 39 meters per minute (~ 4.5 hours for a descent to the Challenger Deep at ~10,920 m).

(Description obtained from the R/V Falkor FK141215 post-cruise report (PDF))

Dataset NamePI-Supplied DescriptionPI-Supplied Name
515F-926R 16S rRNA gene sequencing accessions from seawater and sediment samples from R/V Falkor FK141109 and R/V Thompson TN309 from the Mariana and Kermadec trenches, 2014 (Mariana Perspectives project)
Cell counts from hadopelagic samples in the Mariana and Kermadec trenches, collected on R/V Falkor FK141109, FK141215, and R/V Thompson TN309, 2014 (Mariana Perspectives project)
Direct counts (flow cytometry) on microbes obtained by Niskin bottle and pressure-retaining sampler from the Leggo Lander on R/V Falkor cruise FK141215 in the Challenger Deep, Mariana Trench in December 2014
Isolation of microbes from hadal water and sediments from Mariana and Kermadec trenches from R/V Falkor, R/V Thomas G. Thompson FK141109, TN309, FK141215, April to December 2014 (Mariana Perspectives project)
General nutrient data (averages) from Leggo drop 1 seawater collected by Niskin bottle on R/V Falkor cruise FK141215 in the Challenger Deep, Mariana Trench in December 2014
Culture-independent identification of bacteria present in the pressure-retaining seawater (PRS) sampler deployed during Leggo drop 1 from R/V Falkor cruise FK141215 in the Challenger Deep, Mariana Trench in December 2014
Colony forming units (CFUs) of water samples from Mariana and Kermadec trenches grown in 3 media from R/V Falkor FK141109, FK141215, and R/V Thompson TN309, 2014 (Mariana Perspectives project)
Viable cell counts on the bacteria in the seawater collected in the Niskin bottles during Leggo drops 1 and 3 on R/V Falkor cruise FK141215 in the Challenger Deep, Mariana Trench in December 2014
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Funded by the U.S. National Science Foundation