1
ABSTRACT.
±
Synechococcus
BChlaS BC/ChlaS
Key words:
Producción primaria estacional en la estación EPEA, Atlántico Sudoccidental: relaciones con
la composición del toplancton y las propiedades ambientales
RESUMEN.
±
Seasonal primary production at the EPEA station, southwestern Atlantic:
relationships with phytoplankton composition and environmental properties
1111
11
1
Valeria Segura Daniela Del Valle
Vivian A. Lutz Moira Luz Clara
M. Guillermina Ruiz Lucrecia Allega
Carla F. Bergho Guillermina García Facal
Marine and
Fishery Sciences
MAFIS
*
Marine and Fishery Sciences 39 (1): xxx-xxx (2026)
a
Chla
α
in situ
Synechococcus
BChlaS BC/ChlaS
Palabras clave:
Segura et al.: How productive is the EPEA?
Sampling and determination of variables
=
= =
=
Environmental variables
in vivo
Marine and Fishery Sciences 39 (1): xxx-xxx (2026)
+
+
Biological variables
in situ
Segura et al.: How productive is the EPEA?
Chlorophyll a concentration
ain situChla
a
<µChlaS5
ChlaS5a
ChlaS5 a
ChlaZEU
in vivo
ChlaChla
ChlaChlaZEU
Particulate absorption coecients
aλ
anapλ
Marine and Fishery Sciences 39 (1): xxx-xxx (2026)
%ChlaS5 ChlaS5ChlaS
B Chla Chla
aBph443 Chla
ap
aph
B
BC /ChlaS Chla
B
B
B
B
Chla ain situ
ChlaS ain situ
ChlaS5 a
µ
ChlaZEU a
Ek
E µ
E µ
E
E µ
In vivo
micro µ
nano µ
p h
p0 h
B Chla Chla
pico <µ
PZT
ultra µ
Segura et al.: How productive is the EPEA?
aphλ
[aphλ = apλ- anapλ
ChlaaBphλ
Phytoplankton community
pico<µ
ultraµ
nanoµmicro
µ
nanomicro
pico ultra
µ
ChlaS BC/ChlaS
Primary production
µ
in situ
p
µ
α
µ
s
Ek
α
α
aphλ
αChlaS
Marine and Fishery Sciences 39 (1): xxx-xxx (2026)
αB
B
p0
PZT
PZTp0PZT
ChlaZEU
Statistical analysis
ChlaSChlaS5aBphλ
=
=
= =
s
<
ChlaSaph443p0BC/ChlaS
Variation in environmental properties
Irradiance
E
=
<=
Temperature and salinity
Segura et al.: How productive is the EPEA?
Mixed layer depth
Variation in biological variables
Chlorophyll a concentration
ChlaS
ChlaS<
ChlaS=
<=
ChlaS5
%ChlaS5
ChlaZEU
Specic phytoplankton absorption coecient
aBph443
Chla
aph443ChlaS
= <=aph443ChlaZEU
=<=aph443ChlaS5
=<=
Phytoplankton composition
B
B
Synechococcus
Trieres sinensis
Eucampia
~
BC/ChlaS
±±
s=
<=
Photosynthesis parameters and primary production
rates
B±
± Chla
Marine and Fishery Sciences 39 (1): xxx-xxx (2026)
+ ChlaS ChlaZEU ChlaS5aph443 aBph443
Segura et al.: How productive is the EPEA? 11
B B Ekp0PZT
BC/ChlaS
Marine and Fishery Sciences 39 (1): xxx-xxx (2026)
B
±±Chla
hEk±
±
B>Chla
h
αBEk=<=
αB =<=
=<==
<=
p0 PZT
±±
±±
p0ChlaS
p0ChlaS=<=p0
B=<=PZTChlaS
s=<=PZTChlaZEU
SST (°C)
( quanta )mol m d
- -12
A B
C D
n
Segura et al.: How productive is the EPEA?
=<=PZTBs=
<=
Environmental and biological characterization
of EPEAPP
~
ChlaSaph443
p0 ~
,
BC/ChlaS
Chlaaph443p0
BC/ChlaS
ChlaS
aph443p0BC/ChlaS
ChlaSaph443
BC/ChlaS
1.00
0.75
0.50
0.25
0.00
-0.25
-0.50
-0.75
-1.00
ESAT
SST
SSS
MLD
ChlaS
ChlaZEU
aph()443
B
Ek
Pm
B
p0
PZT
BC
BCnano
BCmicro
BCultra
BCpico
ESN
BC/ChlaS
ESAT
SST
SSS
MLD
ChlaS
ChlaZEU
B
Ek
p0
PZT
BC
B
Cnano
B
Cmicro
B
Cultra
B
Cpico
ESN
B
C
/ChlaS
a
ph
( )443
P m
B
Chlas ChlaZEU aph443 αB
BEk p0 PZT BC /ChlaS
−+
Marine and Fishery Sciences 39 (1): xxx-xxx (2026)
Phytoplankton production: eciency and com-
munity dynamics
±
ChlaS(mg m )
-3
a
B
ph
( )443 (m (mg ) )
2 -1
Chla
%ChlaS5(%)
ChlaS5(mg m )
-3
A B
C D
n: 37 n: 30 n: 32 n: 36 n: 23 n: 28 n: 28 n: 30
n: 28 n: 28 n: 30 n: 34 n: 27 n: 34 n: 33n: 23
6
5
4
3
2
1
0
2.5
2.0
1.5
1.0
0.5
0.0
100
80
60
40
20
0.20
0.15
0.10
0.05
0.00
Dec2008
Nov2016
Dec2008
Oct2012
Mar2014
Nov2016
ChlaS ChlaS5 %ChlaS5 aBph443
n
Segura et al.: How productive is the EPEA?
BC/ChlaS
B /Chla
C S
(mg C (mg ) )Chla -1
B (mg C m )
C
-3
%B
C
120
100
80
60
40
20
0
175
150
125
100
75
50
25
0
100
80
60
40
20
0
Cyanobacteria
1. spp.Synechococcus
Diatoms
2. Centric
3. Dactyliosolen fragilissimus
4. Trieres sinensis
5. Cerataulina pelagina
6. sp.Eucampia
7. sp.Lauderia
8. sp.Coscinodiscus
9. Leptocylindrus danicus
10. Asterionellopsis glacialis
11.sp.Pseudo-nitzschia
12. Asteromphalus sarcophagus
Dinoflagellates
13. Pseliodinium fusus
14. Tripos muelleri
15. sp.Scrippsiella
16. Cryptophyta
17. Picophytoeukaryota
18. Haptophyta
Coccolithophores
19. Emiliania huxleyi
Other protists
20. sp.Meringosphaera
16 16 16
17
44 4
1
18
16 16 16 16
57
4
68
111
16 16 16
17
19 10 21915
14 911 12
11111111
220
16
3
13
BCnano
BCmicro BCultra BCpico
Marine and Fishery Sciences 39 (1): xxx-xxx (2026)
ChlaS
p0p0/ChlaS
PZT
2,200
2,000
1,800
1,200
1,000
800
600
400
200
0
PZT (mg C m d )
-2 -1
20.0
17.5
15.0
12.5
10.0
7.5
5.0
2.5
0.0
7
6
5
4
3
2
1
0
p0(mg C m h )
-3 -1
p Chla
0 S (mg C mg h )Chla
-1 -1
Segura et al.: How productive is the EPEA?
~
+~µ
+ =µ
1
Synechococcus
Synechococcus
p0/ChlaS
ChlaS
Chla
BC/ChlaS
Chlas, aph443p0BC/ChlaS
Season
Autumn
Spring
Summer
Winter
SST
MLD
SSS
Nov2016
Dec2008
PC1 PC2 PC3 1
0
AB
-1
12
0
-1.0
0.5
0.0
1.0
-0.5
PC2 (30.2%)
PC1 (35.7%)
ESAT
SST
SSS
MLD
ChlaS
aph()443
p0
BC
BC/ChlaS
ESAT
ChlaS
a
ph
( )443
p0
BC
BC/ChlaS
Marine and Fishery Sciences 39 (1): xxx-xxx (2026)
αBEk
αB
Ek
αB B
aBph443 ChlaS
αB
B
Eₖ
Drivers of phytoplankton productivity at EPEA
Chla
BC/ChlaS
Chla
PZT
Trieres sinensis
Eucampia
Segura et al.: How productive is the EPEA?
ChlaBC/ChlaS
BC/ChlaS
BC/ChlaS
BC/ChlaS
B
ChlaS
Marine and Fishery Sciences 39 (1): xxx-xxx (2026)
Trieres sinensis
±
a
BC/ChlaS
Author contributions
Segura et al.: How productive is the EPEA?
Marine and Fishery Sciences 39 (1): xxx-xxx (2026)
a
Mytilus edulis
Alexandrium tamarense
Segura et al.: How productive is the EPEA?
a
Marine and Fishery Sciences 39 (1): xxx-xxx (2026)
Segura et al.: How productive is the EPEA?
in situ
Marine and Fishery Sciences 39 (1): xxx-xxx (2026)
