Role of bacterioplankton as producers in two high-productivity marine ecosystems

Book · Wed Jan 01 04:00:00 EST 1986

OSTI ID:6704633

Krempin, D W

This dissertation addresses the quantitative role of bacterioplankton as producers of particulate biomass in two marine planktonic environments. Some of the assumptions involved in using the incorporation of /sup 3/H-thymidine into cold trichloroacetic acid insoluble material to estimate bacterioplankton production may be improved, or eliminated, with use of /sup 3/H-thymidine or /sup 3/P-orthophosphate to label cells, followed by enzymatic hydrolysis with DNAse to measure newly synthesized DNA. Large increases in the rates of primary production and secondary production were observed during seasonal upwelling events examined for the Organization of Persistent Upwelling Structures (OPUS) study. While chlorophyll a concentration also increased bacterioplankton biomass remained relatively constant. Secondary production was roughly 10% of primary production. During the Antarctic Marine Ecosystem Research at the Ice Edge Zone (AMERIEZ) study, chlorophyll a, which varied by 2 orders of magnitude, and bacterioplankton biomass, which changed by less than 1 order of magnitude, were greatest near the ice edge, where maxima in the rates of primary production and secondary production also were observed. The covariability of microbial standing stocks and rate processes in different zones of an upwelling and an ice edge ecosystem was used to support the concepts of ecological succession, zonation and trophic coupling of phytoplankton and bacterioplankton assemblages in the OPUS and AMERIEZ studies.

• Research Organization: University of Southern California, Los Angeles (USA)
• OSTI ID: 6704633
• Country of Publication: United States
• Language: English

Related Subjects

520101* -- Environment
Aquatic-- Basic Studies-- Radiometric Techniques-- (-1989)
54 ENVIRONMENTAL SCIENCES
AQUATIC ECOSYSTEMS
AQUATIC ORGANISMS
AZINES
BACTERIA
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BIOMASS
CARBOXYLIC ACIDS
CHLOROPHYLL
DAYS LIVING RADIOISOTOPES
DNA-ASE
ECOLOGICAL SUCCESSION
ECOSYSTEMS
ENERGY SOURCES
ENZYMES
ESTERASES
FOOD CHAINS
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
HYDROLASES
ISOTOPE APPLICATIONS
ISOTOPES
LABELLED COMPOUNDS
LIGHT NUCLEI
MICROORGANISMS
NUCLEI
NUCLEOSIDES
NUCLEOTIDES
ODD-ODD NUCLEI
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHODIESTERASES
PHOSPHORUS 32
PHOSPHORUS COMPOUNDS
PHOSPHORUS ISOTOPES
PHYTOCHROMES
PIGMENTS
PLANKTON
PORPHYRINS
PRODUCTIVITY
PROTEINS
PYRIMIDINES
RADIOISOTOPES
RENEWABLE ENERGY SOURCES
RIBOSIDES
THYMIDINE
TRACER TECHNIQUES
TRITIUM COMPOUNDS