Physiological and behavioral responses of Bathynerita naticoidea (Gastropoda: Neritidae) and Methanoaricia dendrobranchiata (Polychaeta: Orbiniidae) to hypersaline conditions at a brine pool cold seep Ahna L. Van Gaest 1 , Craig M. Young 1 , John J. Young 1,2 , Alicia R. Helms 1,3 & Shawn M. Arellano 1 PRESENTED BY: DE JESUS, DEL ROSARIO, OLIVAR, UY
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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
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?
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.
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