Luc
í
a
Lopez
-
Lopez
,Ana Mi anda, Ge a do Casas, Izaskun P eciado, Elena Tel, Julio Gil
Luc
í
a
Lopez
Lopez
,
Ana
Mi anda,
Ge a do
Casas,
Izaskun
P eciado,
Elena
Tel,
Julio
Gil
Spanish Ins i u e o Oceanog aphy- C.O. San ande
The pelagic sys em o e he shel b eak a ea is a complex en i onmen ac ing as a ansi ion
zone be ween he p oduc i e shel and he oligo ophic wa e s o he open ocean. The
exchange be ween hese wo sys ems is pa icula ly ele an in coas al ma gins wi h na ow
shel es
and
wind
‐
d i en
upwelling
[
1
]
such
us
he
No h
‐
Wes e n
Ibe ian
shel
b eak
du ing
E
Figu e 4. Resul s om he
NMDS analysis on he log
ans o med
mesozooplank on
abundance da a. Capi al
le e s a e used o adul s
and
lowe
case
o
la ae
“‐
shel es
and
wind
d i en
upwelling
[
1
]
,
such
us
he
No h
Wes e n
Ibe ian
shel
b eak
du ing
he summe ‐au umn [2]
The biological composi ion o mesoscale s uc u es is o iginally de e mined by he sou ce
wa e mass, howe e hei e olu ion (isola ion o eddies and wa ming and mixing o
upwelled wa e s) a ec s communi y composi ion by modi ying species abundance and
biomass [3].
Wi h his s udy, we aimed a di e en ia ing he mesozooplank on g oup’s abundance be e
cha ac e izing
he
e olu ion
om
ecen ly
upwelled
wa e s
o
s a i ica ion
and
an icyclonic
RATIONAL
E
Fig
and
lowe
case
o
la ae
.
‐
N” and “‐C” s ands o
nauplius and cyp is,
espec i ely. Elipses
enci cling he poin s
ep esen ing di e en
oceanog aphic condi ions
a e d awn o easing he
in e p e a ion.
cha ac e izing
he
e olu ion
om
ecen ly
upwelled
wa e s
o
s a i ica ion
and
an icyclonic
eddy condi ions.
Sampling was pe o med du ing dayligh be ween 23 d Sep embe and 10 h Oc obe 2009
along he No h‐wes e n shel b eak o he Ibe ian Peninsula.
D
S
Figu e 3. Communi y
composi ion in he
sampling s a ions
a ending o he main
zooplank on g oups. The
adius o he pies a e
p opo ional o he o al
abundace (N/m3)in he
sample, wi h minimum
being
10
02
ind
∙
m
‐3
and
Sampling loca ions we e de e mined in si u acco ding o he CTD p o iles, including upwelling
a eas‐(Fig 1a) di ided a e wa ds in o ea ly, medium and la e upwelling‐s a i ica ion a eas
(Fig 1b) and an icyclonic eddy s uc u es (Fig 1c). The obse ed anomalies we e co obo a ed
wi h he 10m and 50 m empe a u e anomalies (Fig 2a and2b espec i ely).
Zooplank on was sampled wi h a 40 cm diame e bongo ne wi h 200µm mesh size in
double
‐
oblique
hauls
up
o
100
m
Samples
we e
s o ed
in
4
%
bu e ed
o malin
L
&METHO
D
h oughou he s udy a ea, ollowed by doliolids, appendicula ians and
siphonopho es (Fig 3).
The
non
me ic
mul idimensional
scaling
(NMDS)
on
he
assemblages
’
abundance
Mesozooplank on abundance (ind ∙m‐3)washighe
in he No h‐wes e n edge o he s udy si e and
copepods we e he mos abundan g oup
being
10
.
02
ind
∙
m
and
maximum 311.04 ind ∙m‐3
double
oblique
hauls
up
o
100
m
.
Samples
we e
s o ed
in
4
%
bu e ed
o malin
immedia ely a e collec ion. In he labo a o y, samples we e iden i ied and classi ied in o he
main axonomic g oups, di e en ia ing holoplank on om me oplank on.
NMDS analysis on he log‐ ans o med abundance da a was calcula ed o s udy simila i y
amongs sampling condi ions. ANOSIM and SIMPER analysis we e also pe o med on he
abundance da a ma ix.
MATERIA
L
The
non
me ic
mul idimensional
scaling
(NMDS)
on
he
assemblages
abundance
composi ion clea ly iden i ied he di e en domains (Fig 4). Indeed, he analysis o
simila i ies (ANOSIM) on he communi ies’ s uc u e iden i ied hese domains as
s a is ically di e en (p < 0.05, 999 pe mu a ions). The second axes o he NMDS
seemed o d i e he mesozooplank on communi y succession om upwelling o
an icyclonic eddy condi ions.
Based
on
hese
i e
oceanog aphic
domains
simpe
analysis
showed
ha
eddy
RESULTS
The iden i ica ion o oceanog aphic domains h ough T‐S p o iles in si u is p o en
N
S
Based
on
hese
i e
oceanog aphic
domains
,
simpe
analysis
showed
ha
eddy
s a ions showed low abundance o la al s ages. Ea ly upwelling s a ions di e ed
om o he upwelling phases by hei lowe p opo ion o appendicula ians and
ela i e high lamelib achia la ae abundance.
30'
43
o
N
30'
44
o
N
30'
14
16
18
3
4
5
6
7
89
o be a eliable me hod o iden i ying sho ‐li ed oceanog aphic s uc u es.
Wa ming in su ace wa e s was ound o al e he mesozooplank on communi ies
be ween ea ly upwelled and an yciclonic eddy condi ions. Chae ogna a, jelly ish
and la al s ages associa ed wi h he o me while os acods appendicual ians and
o amini e a wi h he la e . Howe e , copepods we e he dominan
mesozooplank on g oup in he s udy a ea, h oughou all he oceanog aphic
domains s udied.
C
ONCLUSIO
N
10
o
W 8
o
W 6
o
W 4
o
W 2
o
W 0
o
42
o
N
14
43
o
N
30'
44
o
N
30'
13
14
15
16
3
4
5
6
7
89
12
Figu e 1: a) Typical Tempe a u e‐Salini y‐Oxigen (TSO) p o ile o s a i ica ion in he
wa e column [S a ion 1]; b) Typical TSO p o ile o a ecen upwelling e en [S a ion 4];
c) Typical TSO p o ile o a ecen upwelling e en [S a ion 8]
[1] Mo ales e al. (2010) P og.Oceanog . 84: 158‐173; [2] Gil (2008) J. Biol. Assoc.
UK. 88:217‐225; [3] S zelecki e al. (2007) Deep‐Sea Res II. 54: 1103‐1112
Bib
C
10
o
W 8
o
W 6
o
W 4
o
W 2
o
W 0
o
42
o
N
30'
12
Figu e 2: a) In si u empe a u e ield a 10 m. b) In si u empe a u e ield a 50 m. Simbols ep esen sampling
s a ions cha ac e ised by s a i ica ion ( illed ci cle), eddy (open ci cle), ea ly upwelling ( iangle), medium upwelling
(squa e) and la e upwelling (s a ).
12
View publica ion s a s