Santa Cruz Wharf
Wednesday, April 9, 2025
* Quick HAB Observations *
– Pseudo-nitzschia: Common
– Alexandrium: None
– Dinophysis: Rare
– Margalefidinium: None
* Impressions *
Another lovely and sunny morning at the wharf. Net tow remains mostly diatoms with a decrease in dinoflagellate abundance. Phytoplankton biomass increased this week and the phytoplankton assemblage shifted slightly with Skeletonema and Pseudo-nitzschia (seriata size) being the most abundant. P. australis concentrations increased an order of magnitude and no P. multiseries were detected. Alexandrium concentration decreased from last week.
Dinoflagellates:
R: Protoperidinium
R: Dinophysis
R: Ceratium
R: Prorocentrum
R: Gymnodinium
R: Noctiluca
R: Boreadinium
R: LRB
Diatoms:
C: Skeletonema
C: Pseudo-nitzschia
C: Dactyliosolen
C: Leptocylindrus
C: Chaetoceros
P: Guinardia
P: Thalassiosira
P: Detonula
P: Eucampia
R: Lauderia
R: Thalassionema
R: Paralia
R: Asterionellopsis
R: Pleurosigma
R: Asteromphalus
R: Ditylum
R: Rhizosolenia
R: Lithodesmium
R: Odontella
R: Thalassiothrix
R: Coscinodiscus
Other:
R: Phaeocystis
* Environmental Information *
Time: 9:40 am
Collector: K. Negrey
Water Conditions (SCW)
Water Temperature: 13.7 C
Water Conditions: Calm
Water Color/Code: Green, 10GY 3/4 (#29)
Water Visibility: 5 ft
Tide: Falling, High – 8:57, 4.2 ft
Surf Report: WNW swell, 4-6
NDBC buoy 46236
– Significant wave height: 1.8 m
– Swell height/direction: 1.4 m, WNW
– Wind wave height/direction: 1.2 m, WNW
Weather Conditions (KudelaHawk)
Sky: Sunny
Air Temperature: 55.9 F (13.3 C)
Wind: 4 mph, E
Solar radiation: 479 watts/m^2
Monterey Wharf II
Wednesday, April 9, 2025
* Quick HAB Observations *
– Pseudo-nitzschia: Present
– Alexandrium: None
– Dinophysis: Present
– Margalefidinium: None
* Impressions *
The wharf was sunny with clear skies. There were lots of birds on the surface of the water. There was an Akashwio bloom! The biomass clogged my phytoplankton net this morning. The water this week was significantly more red/brown than last week with a visibility of 2.0m. Visually chlorophyll increased from last week. Dinoflagellates dominated the water column. Akashiwo was abundant (>=50%). Thalassiosira, Pseudo-nitzschia, Dinophysis, Prorocentrum, and Ceratium were present (1-10%). The HAB species that were observed in the water this morning included Pseudo-nitzschia, Dinophysis and Akashiwo sanguinea.
Dinoflagellates:
A: Akashiwo sanguinea
P: Prorocentrum spp.
P: Dinophysis spp.
P: Ceratium spp.
R: Pyrophacus spp.
R: Amylax
Diatoms:
R: Chaetoceros spp.
P: Thalassiosira spp.
R: Coscinodiscus spp.
P: Pseudo-nitzschia spp.
R: Ditylum spp.
R: Guinardia spp.
R: Pleurosigma spp.
R: Skeletonema spp.
R: Tropidoneis spp.
R: Lauderia spp.
R: Leptocylindrus spp.
R: Eucampia
Zooplankton:
R: fecal pellets, nauplii, tintinnids, calanoids, fish larvae, eggs
R: Oligiotrich
* Environmental Information *
TIME: 0715 PT
COLLECTOR: Hannah McGrath
Water Temperature: 14.0°C
Water Conditions: calm
Water Color: 5Y 2/2 *note the water color was more brown/red
Visibility: 2.0 m
Tide: Rising, 1.10 m, high at 0903 h
Sky: sunny/ clear skies, 0% cloud
Air Temperature: 11.11°C
Wind: offline, 1.34m/S
Rare (R): <1% ~~~ Present (P): 1 – 9% ~~~ Common (C): 10 – 49% ~~~ Abundant (A): >= 50%