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SUMMARY:The euphausiid exception in the oxygen minimum zone (OMZ)  - Dr. J
 aime Farber-Lorda (Centro de Investigación Cientifica\, Ensenada\, Mexico
 ) 
DTSTART:20170621T130000Z
DTEND:20170621T140000Z
UID:TALK73101@talks.cam.ac.uk
CONTACT:Claire Waluda
DESCRIPTION:Samples obtained with a MOCNESS net were analysed for the vert
 ical distribution of euphausiids\, in the entrance of the Sea of Cortés\,
  during November 2009. Two transects were followed: B influenced by the So
 uthern California Current and a southern one\, D\, with more tropical cond
 itions and shallower oxygen minimum. A stratified sampling was performed\,
  with layers of 100 m from 500 to 200 m and every 50 m from 200 to 0 m. A 
 fixed point\, with continuous samplings\, were performed\, for 48 hours in
  transect D. Most zooplankton groups were scarce or absent\, in hypoxic wa
 ters down from ~100 to 500 m depth\, with the exception of euphausiids\, w
 hich were present at all layers at all times of the day\, showing their ad
 aptability to low oxygenated waters. The low-oxygen adapted and neritic sp
 ecies Euphausia lamelligera was dominant\, followed by Stylocheiron affine
 \, a non-migrant or short-distance migratory species. These two species ma
 ke 89% of the entire\nsample’s abundance. With the exception of Euphausi
 a tenera\, all species of the genus Euphausia showed vertical migration wi
 thin the oxygen minimum layer. The rest did not show long vertical migrati
 ons\, but stayed within the first 150 m layer\, which is\, however\, well 
 within the oxygen minimum layer\, showing that these are capable of migrat
 ing in the low oxygen layer\, probably for short time. Furcilia stages wer
 e present in shallower waters only in the first 150 m. These results demon
 strate that euphausiids and especially the genus Euphausia are the best ad
 apted zooplankton group to low oxygen conditions.\n
LOCATION:British Antarctic Survey\, Innovation Centre\, Seminar Room 1
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