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    Response of benthic foraminifera Rosalina leei to different temperature and salinity, under laboratory culture experiment

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    J_Mar_Biol_Assoc_UK_88_699.pdf (299.1Kb)
    Open Access (188.3Kb)
    Date
    2008
    Author
    Nigam, R.
    Kurtarkar, S.R.
    Saraswat, R.
    Linshy, V.N.
    Rana, S.S.
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    Abstract
    Live specimens of benthic foraminiferal species Rosalina leei were subjected to a combination of temperature (25 degrees C, 30 degrees C and 35 degrees C) and salinity (25 ppt, 30 ppt, and 35 ppt) to assess its differential response to the annual range of seawater temperature and salinity reported at the sampling site. A total of 216 specimens were used for the experiment. Within the range of temperature and salinity, to which R. leei specimens were subjected as part of the present experiment, growth increased with increasing salinity, whereas increase in seawater temperature resulted in retarded growth. Maximum growth was reported in the specimens kept at 25 degrees C temperature and 35 ppt salinity while the rest of the specimens maintained in 30 ppt and 25 ppt saline water, showed comparatively less growth. The specimens kept at 30 degrees C and 35 degrees C temperature and different salinities showed much less growth as compared to the specimens maintained at 25 degrees C temperature. However, none of the R. leei specimens subjected to the present experiment reproduced during the course of the experiment. The absence of reproduction under the present set of temperature and salinity conditions probably indicates that R. leei reproduces at a very narrow range of temperature and salinity which is different from the temperature and salinity conditions in the present experiment. It is further inferred that under the present set of temperature-salinity conditions, 25 degrees C temperature and 35 ppt saline water is most suitable for the growth of R. leei. Results are significant as the responses of benthic foraminifera to different temperatures and salinity are being used for palaeoclimatic reconstruction.
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    http://drs.nio.org/drs/handle/2264/1315
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