122 journal reporting

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Reference:
Marine Ecology 28 (2007) 199–207 ª 2007 The Authors. Journal compilation ª 2007 Blackwell Publishing Ltd

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  • Key words:In Gulf of Mexico na sea water may two abundant invertebrate species:Bathynerita – outer part -> high methane and low oxygen + high hydrogen sulfideMethanoaricia – inner part adjacent to brine pool -> high methane and oxygen + low hydrogen sulfidePhysiological response – automatic, instinctive and unlearned reaction to stimulusBehavioral response – attitude of the animal to stimuliCold Seep – higher temperature; formed in sea water. One type is brine pool others can be mud volcano and oil seepsBrine Pool – Hypersaline; three to five times greater than the surrounding oceanHalocline -  subtype of chemocline caused by a strong, vertical salinity gradient within a body of water. Because salinity (in concert withtemperature) affects the density of seawater, it can play a role in its vertical stratification. Increasing salinity by one kg/m3 results in an increase of seawater density of around 0.7 kg/m3.
  • B. Naticoidea salinity of 65 appeared stressed, often lying upside down with the operculum open
  • B. Naticoidea salinity of 65 appeared stressed, often lying upside down with the operculum open
  • B. Naticoidea salinity of 65 appeared stressed, often lying upside down with the operculum open
  • 122 journal reporting

    1. 1. Physiological and behavioral responses of Bathyneritanaticoidea (Gastropoda: Neritidae) andMethanoaricia dendrobranchiata (Polychaeta:Orbiniidae) to hypersaline conditions at a brine poolcold 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
    2. 2. INNER ZONE: Bathynerita naticoidea are abundant High Methane and High Oxygen Concentrations High salinity BRINE POOL SURROUNDED BY MUSSEL BED I Bathymodiolus childressi OOUTER ZONE:Methanoaricia dendrobranchiataare abundantLow Oxygen Concentration SALINITY OF BRINE POOL:Low salinity 121.35 ~ 120
    3. 3. INQUIRY Under experimental conditions, which between the two differently distributed species (Bathynerita naticoidea: outer; Methanoaricia dendrobranchiata: inner) in a brine pool can tolerate higher salinities?
    4. 4. EXPERIMENT Legend Incubating Medium of Different salinities Individuals Salinities: 35, 45, 55, 65, 75 85 Incubation time: 15 hours
    5. 5. EXPERIMENT VS Salinities: 35, 55, 75,
    6. 6. EXPERIMENT Salinity 75 Weight Initial Weight every hour 6hr incubation
    7. 7. RESULTS 120 100 Percent Survival 80 60 40 20 0 35 45 55 65 75 85 Salinities B. naticoidea M. dendrobranchiata
    8. 8. RESULTSIndication:Both species areOSMOCONFORMERS
    9. 9. RESULTS BEHAVIOURAL MECHANISMS THAT ALLOWED SURVIVAL IN THEIR SPECIFIC HABITATS Bathynerita naticoidea Methanoaricia dendrobranchiata Tight closing of the operculum Exists in large clumps to spread (seen in salinities 65-85) their collective surface area across the tops of the mussels in such a way to remain out of the Avoid entering salinities higher brine than 60 (confirmed by halocline experiment done by authors)
    10. 10. CONCLUSION• B. naticoidea was found to have higher salinity tolerance compared to M. dendrobranchiata• Salinity tolerances do not explain the differences in the distribution of the 2 organisms• Behavior is a likely mechanism for controlling horizontal distribution of this species across the mussel bed.
    11. 11. THANK YOU FOR LISTENING!AND REMEMBER BEHAVIOUR IS PHYSIOLOGICALLY IMPORTANT!

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