Curtin University Homepage
  • Library
  • Help
    • Admin

    espace - Curtin’s institutional repository

    JavaScript is disabled for your browser. Some features of this site may not work without it.
    View Item 
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item

    Records and causes of Holocene salinity shifts in Laguna de Bay, Philippines

    Access Status
    Fulltext not available
    Authors
    Jaraula, Caroline
    Siringan, F.
    Klingel, R.
    Sato, H.
    Yokoyama, Y.
    Date
    2014
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Jaraula, C. and Siringan, F. and Klingel, R. and Sato, H. and Yokoyama, Y. 2014. Records and causes of Holocene salinity shifts in Laguna de Bay, Philippines. Quaternary International. 349: pp. 207-220.
    Source Title
    Quaternary International
    DOI
    10.1016/j.quaint.2014.08.048
    ISSN
    1040-6182
    School
    Department of Chemistry
    URI
    http://hdl.handle.net/20.500.11937/30255
    Collection
    • Curtin Research Publications
    Abstract

    A 7000-year record of salinity shifts from molluscan and diatom assemblages and verified geochemical salinity proxies (C/S, S, Sr, Ca, and Sr/Ba) is reconstructed from Philippines' largest freshwater lake Laguna de Bay. The salinity shifts are interplays of millennial-scale sea level change, centennial-scale tectonic activity from the West Marikina Valley Fault (WMVF) and decadal-scale climatic changes. Currently only 1 m above mean sea level, the lake is connected to Manila Bay through the Pasig-Napindan River, which meanders across a densely populated “Parañaque Strip” partly occupied by metropolitan Manila. The controversial WMVF borders the lake on its western shore. Our 10.5 m sediment core from the western lobe reveal that the deposits are from a marine environment deposited 6600 cal BP to 4700 cal BP during a sea level still stand above present mean sea level (apmsl) in Southeast Asia and the Philippines. Episodic decreases in salinity with 260 y cycles were traced to the activity of the WMVF that would have accounted for at least 6 m of uplift of the Parañaque Strip. The vertical component of movement raised a sill and emergent landmass that started to isolate the Paleo-Laguna de Bay from Manila Bay. Subsequent episodic uplifts and sea level fall decreased depths to intertidal levels by 4700 cal BP, salinity to brackish but highly-influenced by marine waters by 4100 cal BP and to freshwater by 3100 cal BP. The latest salinity increase since mid-1960 is attributed to renewed saltwater incursion due to abnormally dry years, low lake levels, and Pasig River delta plain subsidence.

    Related items

    Showing items related by title, author, creator and subject.

    • The distribution pattern of algal flora in saline lakes in Kambalda and Esperance, Western Australia
      Handley, Michelle Anne (2003)
      The study has attempted to characterise the physicochemical limnology and distribution of algal flora of two salt lake systems in Western Australia, one from the coastal Esperance region and the other from the inland ...
    • Limnology and biota of Lake Yindarlgooda - an inland salt lake in Western Australia under stress
      Campagna, Veronica (2007)
      Inland salt lakes of the arid and semi-arid zones of Western Australia are unique systems. An unpredictable rainfall pattern and a transient water regime ensure these lakes remain dry for much of the year. Lake Yindarlgooda ...
    • Freshwater cyanoprokaryota blooms in the Swan Coastal Plain wetlands: ecology, taxonomy and toxicology
      Kemp, Annabeth S. (2009)
      Relatively little published information on cyanoprokaryote (blue-green algal) blooms in the freshwater wetlands in Western Australia is available. There has been little research on the urban lakes and rivers, examining ...
    Advanced search

    Browse

    Communities & CollectionsIssue DateAuthorTitleSubjectDocument TypeThis CollectionIssue DateAuthorTitleSubjectDocument Type

    My Account

    Admin

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    Follow Curtin

    • 
    • 
    • 
    • 
    • 

    CRICOS Provider Code: 00301JABN: 99 143 842 569TEQSA: PRV12158

    Copyright | Disclaimer | Privacy statement | Accessibility

    Curtin would like to pay respect to the Aboriginal and Torres Strait Islander members of our community by acknowledging the traditional owners of the land on which the Perth campus is located, the Whadjuk people of the Nyungar Nation; and on our Kalgoorlie campus, the Wongutha people of the North-Eastern Goldfields.