Our
list of HAB occurrences in SC waters
has
expanded to 25 harmful algal
species (designated when abundances > 1000 cell
ml-1, with the exception of Pfiesteria
spp., when abundance
exceeded 100 cell ml-1;). Most of
these have been
associated with potential or
documented harmful effects.
A
summary of the screening
results from all the samples collected from 2000-2005 demonstrates that
the
ranking of important phytoplankton species in South Carolina changes
dramatically when you consider total abundance rather than just
documenting the
presence of a given species. While there
are many diatoms, mixed flagellate and dinoflagellate
species represented in our database (Table 1), most of the blooms are
attributed to raphidophytes, dinoflagellates,
and cyanobacteria (Table 1, Fig. 1). This report will discuss the intensive
monitoring and experimental results evaluating these important harmful
algal
bloom producers in South Carolina
waters.
Table 1. Results
from
the 2000-2005 SCHABP database with the top
20 species
listed as present in # occurrences column and the top 20 species with
densities
greater than 1,000 cells/ml listed in the # blooms column.
|
|
Species
|
# occurences
|
Species
|
# blooms
|
|
1
|
Navicula sp.
|
1125
|
Chattonella subsalsa
|
46
|
|
2
|
Cryptomonas sp.
|
790
|
Fibrocapsa japonica
|
31
|
|
3
|
Heterocapsa rotundata
|
789
|
Chattonella verruculosa
|
26
|
|
4
|
Euglena sp.
|
740
|
Heterocapsa rotundata
|
24
|
|
5
|
Gyrodinium sp.
|
717
|
Oscillatoria sp.
|
15
|
|
6
|
Kryptoperidinium foliaceum
|
570
|
Kryptoperidinium foliaceum
|
13
|
|
7
|
Nitzschia sp.
|
531
|
Anabaena sp.
|
12
|
|
8
|
Thalassiosira sp.
|
526
|
Heterosigma akashiwo
|
12
|
|
9
|
Chaetoceros sp.
|
524
|
Karlodinium micrum
|
11
|
|
10
|
Nitzschia sp.
|
520
|
Anabaenopsis sp.
|
8
|
|
11
|
Thalassiosira sp.
|
516
|
Nitzschia sp.
|
6
|
|
12
|
Gyrodinium spirale
|
475
|
PLO
|
6
|
|
13
|
PLO
|
455
|
Euglena sp.
|
5
|
|
14
|
Pleurosigma sp.
|
443
|
Gymnodinium sp.
|
5
|
|
15
|
Gyrodinium pingue
|
435
|
Chlamydomonas sp.
|
4
|
|
16
|
Amphiprora sp.
|
427
|
Corkscrew flagellates
|
4
|
|
17
|
Gyrodinium sp.
|
423
|
Heterosigma sp.
|
4
|
|
18
|
Skeletonema sp.
|
408
|
Protoperidinium quinquecorne
|
4
|
|
19
|
Thalassionema sp.
|
391
|
Rhodomonas sp.
|
4
|
|
20
|
Oscillatoria sp.
|
382
|
Prymnesium parvum
|
3
|
Figure 1. Percent
occurrence (by group) of all species and percent blooms (by
group) of all blooms (>1000 cells/ml) in the SC database (2000-2005).
