| dc.date |
2007-05-15T20:21:05Z |
|
| dc.date |
2007-05-15T20:21:05Z |
|
| dc.date |
2004 |
|
| dc.date.accessioned |
2013-10-16T07:49:38Z |
|
| dc.date.available |
2013-10-16T07:49:38Z |
|
| dc.date.issued |
2013-10-16 |
|
| dc.identifier |
NEP-GLOBEC Long-term Observation Program Data Report |
|
| dc.identifier |
http://hdl.handle.net/1957/4875 |
|
| dc.identifier.uri |
http://koha.mediu.edu.my:8181/xmlui/handle/1957/4875 |
|
| dc.description |
This project, part of the Northeast Pacific GLOBEC Long Term Observation Project (NEPGLOBEC-
LTOP), constitutes the first multi-year study of phytoplankton variability in the Oregon coastal
environment. The work divides into two studies: analysis of interseasonal change and analysis of detailed
changes within the summer upwelling period. In the first study, I found that the majority of variability in
phytoplankton biomass in this system is due to changes in the abundance of chain forming diatoms,
particularly diatoms of the genera Chaetoceros and Skeletonema. The abundance of nanoflagellates (<10
μm) remains constant across the shelf. They dominate the phytoplankton community in the offshore
stations and larger cells, usually diatoms, are added inshore. Cyanobacteria, though numerically
abundant, never comprise more than approximately 10% of phytoplankton biomass.
Variation within the summer phytoplankton bloom over the shelf was analyzed based on results
from the four NEP-GLOBEC-LTOP summer cruises between August 1998 and July 2001. Nutrient
concentrations during the summer upwelling blooms show a linear decrease with increasing temperature
from 8 to 12° C. Over this range of temperatures, total Chl a and phytoplankton biomass increase, though
not significantly, and the % Chl a >10 μm remains high (>50 %). Above 12° C, when inorganic nutrients
are depleted or greatly reduced, total Chl a and % Chl a >10 μm decrease. The diatom genera
Chaetoceros and Skeletonema are also responsible for the majority of the variability in phytoplankton
stock during the summer phytoplankton bloom. Dinoflagellates, although present, are consistently less
abundant than diatoms. |
|
| dc.language |
en_US |
|
| dc.publisher |
College of Oceanic and Atmospheric Sciences, Oregon State University |
|
| dc.relation |
Data report (Oregon State University. College of Oceanic and Atmospheric Sciences) |
|
| dc.relation |
194 |
|
| dc.relation |
Reference (Oregon State University. College of Oceanic and Atmospheric Sciences) |
|
| dc.relation |
2004-2 |
|
| dc.relation |
Explorer Site -- North Coast Explorer |
|
| dc.relation |
Explorer Site -- Oregon Explorer |
|
| dc.subject |
phytoplankton |
|
| dc.subject |
Northeast Pacific Ocean |
|
| dc.subject |
Oregon |
|
| dc.subject |
GLOBEC |
|
| dc.title |
Seasonal and across-shelf trends of the phytoplankton community of the Oregon coastal environment |
|
| dc.type |
Technical Report |
|