• Login
    View Item 
    •   DSpace Home
    • Institute's contributions
    • Scholarly literature
    • View Item
    •   DSpace Home
    • Institute's contributions
    • Scholarly literature
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Biogeochemistry and ecology of Pyrosoma spinosum from the Central Arabian Sea

    Thumbnail
    View/Open
    Zool_Stud_54_3.pdf (2.703Mb)
    Date
    2015
    Author
    Gauns, M.
    Mochemadkar, S.
    Pratihary, A.K.
    Roy, R.
    Naqvi, S.W.A.
    Metadata
    Show full item record
    Abstract
    Background: A swarm of pelagic tunicate (Pyrosoma spinosum) was found in the surface open waters of the Arabian Sea during late southwest monsoon (September 2007). The swarm site was characterized by moderate southwesterly wind (approximately 7 m s<sup>-1</sup>), relatively low sea-surface temperature (approximately 26°C), shallow mixed layer (approximately 50 m), and substantial macro-nutrient concentrations (surface values: 2.5 mu M nitrate, 0.3 mu M phosphate, 0.9 mu M silicate, and 5.0 mu M ammonium). Despite adequate macronutrient availability, the swarm site was characterized by low diversity of phytoplankton (>5 mu m) and mesozooplankton in the upper 200 m. Low chlorophyll a concentration (27.3 mg/m<sup>2</sup> in the upper 120 m) at the swarm site was dominated (90% to 95% in the upper 40 m) by the Synechococcus (20×10<sup>6</sup> /ml). Silicate deficiency in surface waters upwelled or entrained from the thermocline may be a key factor for the dominance of smaller autotrophs (flagellates and cyanobacteria) that seems to offer favorable conditions for episodic occurrence of swarms of these filter feeders. Low carbon content (37% of total dry weight) and the lower molar (carbon-to-nitrogen) ratio (5) in P. spinosum suggest growth of these organisms is carbon-limited. We describe various physicochemical and biological conditions at the P. spinosum swarm location and at two other nearby sites not affected by it. The biological factors predominantly high densities of Synechococcus and flagellates were best suited conditions for the proliferation of pyrosome biomass in the central Arabian Sea
    URI
    http://drs.nio.org/drs/handle/2264/4695
    Collections
    • Scholarly literature [9074]

    DSpace software copyright © 2002-2016  DuraSpace
    Contact Us | Send Feedback
    Theme by 
    Atmire NV
     

     

    Browse

    All of DSpaceCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

    My Account

    LoginRegister

    DSpace software copyright © 2002-2016  DuraSpace
    Contact Us | Send Feedback
    Theme by 
    Atmire NV