The red tide and Myrionecta rubra’s ecological impact and dynamic in the Columbia River estuary
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Transcript of The red tide and Myrionecta rubra’s ecological impact and dynamic in the Columbia River estuary
![Page 1: The red tide and Myrionecta rubra’s ecological impact and dynamic in the Columbia River estuary](https://reader035.fdocuments.us/reader035/viewer/2022062719/56813248550346895d98be1b/html5/thumbnails/1.jpg)
The red tide and Myrionecta rubra’s ecological impact and dynamic in the Columbia River estuary
Intern: Rachel WarnickFrontline Mentor: Lydie Herfort
Senior Mentor: Peter Zuber
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Myrionecta Rubra
• Ciliate • Karyoklepty
– Cryptophyte algae (Teleaulax)
• Red tide blooms in estuary – High primary
productivity • Possible sentinel?
Cryptophyte nucleus
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Our Question 1
• How does the M. rubra bloom start? • Where do the cryptophytes come from?
0 11.5 23 35
Surface salinity (PSU)
Baker Bay
Ocean River Ocean River
0 11.5 23 35
Surface salinity (PSU)
Baker Bay
Ocean River Ocean River
Assimilated model data image of surface water circulation in the Columbia River estuary (CMOP, Antonio Baptista)
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Sampling Locations
• Willapa Bay• Ilwaco Harbor• Chinook Harbor• Hammond• North Channel of Estuary
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2009 Bloom Timeline
June 30
July 21
August 5
No red tide in Baker Bay nor in the estuary
M. rubra and cryptophyte detected in
samples from Baker Bay, not detected in
estuary main channel
Pictures taken by Tawnya Peterson of July 21, 2009 Baker Bay/ Ilwaco sample
Red tide evident both in Baker Bay and the
estuary
Insert M. rubra cell counts???
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How does the M. rubra bloom start?
June 30
July 21
August 5
No red tide in Baker Bay nor in the estuary
M. rubra and cryptophyte detected in
samples from Baker Bay, not detected in
estuary main channel
Pictures taken by Tawnya Peterson of July 21, 2009 Baker Bay/ Ilwaco sample
Red tide evident both in Baker Bay and the
estuary
![Page 7: The red tide and Myrionecta rubra’s ecological impact and dynamic in the Columbia River estuary](https://reader035.fdocuments.us/reader035/viewer/2022062719/56813248550346895d98be1b/html5/thumbnails/7.jpg)
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• Are different strains of M. rubra and its cryptophyte prey found at different times and locations in the Columbia River Estuary system?
Phylogenetic tree of the cryptophyte chloroplast 16S rRNA gene sequences from the 2007 and 2008 Columbia River estuary M. rubra bloom. Herfort et al 2009 (In Prep)
Our Question 2
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18S
5.8S
28S
5.8S
oMR
Our M. rubra ITS sequence
ITS region
•18S= 18S rRNA gene, ribosomal sequence frequently used for
phylogenetic analysis
•ITS= Internal transcribed spacer, a variable DNA region
Genetic Markers
Euk A Euk B
RUBICSO gene of cryptophyte
L2F
L1R
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M. rubra NCBI database sequence
1
1556
1051 1
Our new M. rubra ITS sequence
1242
743
18S M. rubra sequence
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Conclusions continued
• Is there variation, both temporally and spatially, in the strain of M. rubra and the strain of its cryptophyte prey in the Columbia River Estuary system?
Insert rubisco phylogenetic tree here???
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Any Questions?
27 Sept 2008 Picture taken by Alex Derr