Rates of phytoplankton cell division in the field and in iron enrichment experiments
- Univ. of Washington, Seattle (United States)
Increases in chlorophyll with time for contained coastal plankton, expressed as daily division rates, are on average about as high as rates for nutrient-replete cultures at similar temperatures, when daylength is considered. In offshore areas with persistent high nutrients but low chlorophyll, division rates from increased chlorophyll and cumulative NO{sub 3} uptake in the controls of Fe enrichments are on average also high and do not suggest marked Fe deficiency. The normally observed phytoplankton growth in the controls is interpreted as due to release from grazing. Addition of Fe in the treatments leads to blooms and exhaustion of NO{sub 3}. Differences between controls and treatments in rates of chlorophyll increase and NO{sub 3} removal, however, as well as shifts in species composition toward rare species in the treatments, also indicate direct effects of Fe on phytoplankton. To clarify the issues, especially in respect to medium- and large-celled phytoplankton, the author recommended measurements of species-specific division rates.
- OSTI ID:
- 7111701
- Journal Information:
- Limnology and Oceanography; (United States), Vol. 36:8; ISSN 0024-3590
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
29 ENERGY PLANNING
POLICY AND ECONOMY
IRON
BIOLOGICAL AVAILABILITY
PHYTOPLANKTON
CELL DIVISION
SEAS
BIOGEOCHEMISTRY
CARBON SINKS
CHLOROPHYLL
COASTAL REGIONS
ECOLOGICAL CONCENTRATION
NITRATES
NUTRIENTS
PRODUCTIVITY
AQUATIC ORGANISMS
CARBOXYLIC ACIDS
CHEMISTRY
ELEMENTS
GEOCHEMISTRY
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
METALS
NITROGEN COMPOUNDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
PHYTOCHROMES
PIGMENTS
PLANKTON
PLANTS
PORPHYRINS
PROTEINS
SINKS
SURFACE WATERS
TRANSITION ELEMENTS
540320* - Environment
Aquatic- Chemicals Monitoring & Transport- (1990-)
560300 - Chemicals Metabolism & Toxicology
290301 - Energy Planning & Policy- Environment
Health
& Safety- Regional & Global Environmental Aspects- (1992-)