U.S. flag An official website of the United States government.
Official websites use .gov

A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS

A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

i

Phytoplankton and microbial abundance and bloom dynamics in the upwelling shadow of Monterey Bay, California, from 2006 to 2013



Details

  • Journal Title:
    Marine Ecology Progress Series
  • Personal Author:
  • NOAA Program & Office:
    NOS (National Ocean Service)
  • Description:
    Wind-driven upwelling variability and local topography cause an upwelling shadow in the northern region of Monterey Bay, California, to persist seasonally. The present study applied partial least squares regression to a 7-yr time series collected within this retentive feature for the purpose of evaluating the environmental controls on total autotrophic phytoplankton (as chlorophyll a) and picoplankton (Synechococcus spp., picoeukaryotes, and heterotrophic bacteria) abundance. A bloom threshold was defined and applied to all biological groups to evaluate seasonal and inter-annual abundance patterns. Microbial and phytoplankton abundances in the upwelling shadow were positively associated with warmer, nutrient-depleted water. Consistent with these results, two-thirds of phytoplankton blooms occurred in October-November, when surface temperatures were warm and ammonium concentrations were greatest. These blooms were predominantly composed of dinoflagellates, 64% of which were known toxin-producing species. Although the overall relationship of phytoplankton to river discharge rates was negative, phytoplankton blooms in 2006, 2007, 2010, and 2012 followed early rainfall events, which flush nitrogen from the surrounding farms into the bay. Despite the fact that the regional measure of upwelling, the Bakun upwelling index, is seasonally low in the autumn, pulses of cold, nutrient-replete water were advected into the upwelling shadow, additionally supporting late-year blooms. Physical and chemical processes occurring over multiple time scales controlled bloom dynamics in the upwelling shadow of Monterey Bay.
  • Source:
    Marine Ecology Progress Series, 572, 43-56
  • DOI:
  • ISSN:
    0171-8630 ; 1616-1599
  • Format:
    PDF
  • Publisher:
    Inter-Research Science Center
  • Document Type:
    Journal Article
  • Funding:
  • License:
  • Rights Information:
    CC BY
  • Compliance:
    Library
  • Main Document Checksum:
    urn:sha-512:4b0c4fbedbc3bf1d4a6adae6bbb3784b174ba8ee763f7057cfae0c2bf865b235a13ed2c46d7a07e3b2ad3d36ac2397189953c61567053b502ba38e046b25881b
  • Download URL:
  • File Type:
    Filetype[PDF - 511.16 KB ]
PREVIOUS
ON THIS PAGE
Details
The NOAA IR serves as an archival repository of NOAA-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by NOAA or funded partners. As a repository, the NOAA IR retains documents in their original published format to ensure public access to scientific information.
BACK TO TOP