e. hatziyanni, n. lampadariou, p.n. polymenakou & a. tselepides
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Meiofaunal community structure of the Deep Hypersaline Anoxic Basins in relation to their
extreme environmental characteristics
E. Hatziyanni, N. Lampadariou, P.N. Polymenakou & A. Tselepides
Institute of Marine Biology of Crete, Heraklion Crete, Greece
Methodology/work description
• Meiofaunal and macrofaunal community structure (abundance, biomass, species composition and diversity) within the DHABs and along an oxic-anoxic gradient• Comparison of benthic communities among the various DHABs and with those from adjacent sediments outside the influence of DHABs, as well as with those from other reduced environments• Identify specific morphpological and physiological adaptations of different meiofaunal and macrofaunal groups
IMBC involvementIMBC involvement
WP 3: Analysis of the species diversity, community structure and phylogeny of micro-organisms and meiofauna in Mediterranean Deep Hypersaline Anoxic Brines (DHAB)
0
20
40
60
80
100
Discovery L’ Atalante Urania Bannock
indi
v 10
cm
-2
Meiofaunal abundance (0-6cm) out of DHABs
12-43 indiv 10cm-2
copepods (adults+nauplii, 4-13%)foraminifera (25-50%)nematodes (41-64%)
miscellaneous (2-7%)
Chloroplastic pigments (0-0.3cm)Out of DHABs
Chl a
Phaeopigments
CPE
Discovery L' Atalante L' Atalante Urania Bannock0
0.4
0.8
1.2
1.6
(MCAT01) (MCAT03)
μg g
-1d
sed
Chl a
CPE
Phaeopigments
100
0
20
40
60
80
0 0.5 1 1.5
Discovery
0 0.5 1 1.5
L' Atalante(MCAT01)
0 0.5 1 1.5
L' Atalante(MCAT03)
Chloroplastic pigments (vertical distribution)Out of DHABs
dept
h in
sed
(cm
)
Urania
0
20
40
60
80
100
Bannock
μg g-1 d sed
Organic Carbon (0-0.3cm, wet oxidation)Out of DHABs
0
0,02
0,04
0,06
μmol CO2 day-1 ml-1
Discovery basinMCAT01 MCATO3L’ Atalante basin Urania basin Bannock basin
0
0.4
0.8
1.2
%1.6
Typical deep sea meiobenthos Plankton
Discovery
L’ Atalante ATAL01 ATAL02
Urania
Bannock BANN02 BANN01
Meiofauna within the DHABs
Other taxa (bivalves,gastropods)
102030405060708090
DiscoveryMCAT02 MCATO4
L’ Atalante Urania BannockMCBANN2 MCBANN1
indi
v 10
cm
-2
benthic foraminifera (allogromiidae)nematodes
bivalvia (lucinidae/vesicomyidae)gastropods
crustaceamiscellaneous
plankton
Meiofauna within the DHABscommunity structrure
5. 15. 25. 35. 45. 55.Time-->
Uraniax104
0
30
60
90
120
Cholest-5-en-3β-ol
Discoveryx104
0
30
60
90
120
Cholest-5-en-3β-ol
L’ Atalante
Cholest-5-en-3β-ol
Bannock
5. 15. 25. 35. 45. 55.
Cholest-5-en-3β-ol
Cholest-5-en-3β-ol within the DHABs (Mass Spectrometry)
0 5 10 15 20
2
4
6
8
10
0 1 2 3
dept
h in
sed
(cm
)
0 1 2 3 0 1 2 3
% OC (wet oxidation)
Discovery L' Atalante Urania Bannock
Organic carbon within the DHABs
Disc Atal Uran Bann
Out of brine
Brine area
0 5 10 15 20
μmol day-1 ml-1
Discovery basin L' Atalante basin Urania basin Bannock basin
0 0.5 1 0 0.5 1 0 0.05 0.10 0.150 0.05 0.1 0.15
2
4
6
8
10
Out of brine (CO2 production)
Brine area (CO2+CH4 production)
Carbon mineralization within the DHABs
Disc Atal Uran Bann
dept
h in
sed
(cm
)
0 0.5 1
Outside the influence of brinesOutside the influence of brines
Typical oligotrophic environment of the E.Mediterranean
Food availabilitylow levels of sedimentary chloroplastic pigmentslow quality of sedimentary OM
Meiobenthoslow standing stocks
response to food supply
typical abyssal assemblages dominated by nematodes and foraminifera
In the brinesIn the brines
Presence of benthic speciesadapted (?) to the extreme characteristics of the basins
Elevated values of sedimentary parametersHigh abundances of plankton organisms
Extreme but not azoic conditions
Natural sediment traps accumulating OM and decaying organisms
NematodesAllogromiidae foraminifera Lucinidae / Vesicomyidae bivalves, gastropods
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