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Physiological and behavioral responses of Bathyneritanaticoidea (Gastropoda: Neritidae) and Methanoaricia dendrobranchiata (Polychaeta:
Orbiniidae) to hypersaline conditions at a brine pool
cold seepAhna L. Van Gaest1, Craig M. Young1, John J. Young1,2, Alicia R. Helms1,3 & Shawn M. Arellano1
PRESENTED BY: DE JESUS, DEL ROSARIO, OLIVAR, UY
I
O
INNER ZONE:
Bathynerita naticoidea are abundantHigh Methane and High Oxygen ConcentrationsHigh salinity
OUTER ZONE:
Methanoaricia dendrobranchiataare abundantLow Oxygen ConcentrationLow salinity
SALINITY OF BRINE POOL: 121.35 ~ 120
BRINE POOL SURROUNDED BY MUSSEL BEDBathymodiolus childressi
I N Q U I R Y
Under experimental conditions, which betweenthe two differently distributed species(Bathynerita naticoidea: outer; Methanoariciadendrobranchiata: inner) in a brine pool cantolerate higher salinities?
E X P E R I M E N T
Legend
Incubating Medium of Different salinities
Individuals
Salinities: 35, 45, 55, 65, 75 85Incubation time:15 hours
E X P E R I M E N T
Salinities:35, 55, 75, VS
E X P E R I M E N T
Salinity 75
Weight Initial Weight every hour6hr incubation
R E S U L T S
0
20
40
60
80
100
120
35 45 55 65 75 85
Pe
rce
nt
Surv
ival
Salinities
B. naticoidea M. dendrobranchiata
R E S U L T S
Indication:Both species are OSMOCONFORMERS
R E S U L T S
Bathynerita naticoidea Methanoaricia dendrobranchiata
Tight closing of the operculum(seen in salinities 65-85)
Exists in large clumps to spread their collective surface area across the tops of the mussels in such a way to remain out of the brineAvoid entering salinities higher
than 60 (confirmed by halocline experiment done by authors)
BEHAVIOURAL MECHANISMS THAT ALLOWED SURVIVAL IN THEIR SPECIFIC HABITATS
C O N C L U S I O N
• B. naticoidea was found to have highersalinity tolerance compared to M.dendrobranchiata
• Salinity tolerances do not explain thedifferences in the distribution of the 2organisms
• Behavior is a likely mechanism forcontrolling horizontal distribution of thisspecies across the mussel bed.
THANK YOU FOR LISTENING!AND REMEMBER BEHAVIOUR IS PHYSIOLOGICALLY
IMPORTANT!