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Temporal change in zooplankton communities in Ligurian SeaTwo decades in comparison
UNIVERSITÀ DEGLI STUDI DI GENOVAFacoltà di Scienze Matematiche, Fisiche e NaturaliCorso di Laurea in Scienze del Mare
CandidateLuca Stirnimann
SupervisorsProf. Paolo Povero
Dr. Alessandra Conversi
Prof. Giorgio Bavestrello
Portofino – Ligurian Sea
Sea Surface Temperatures in Ligurian Sea (Cattaneo-Vietti et al., 2015)
Water column temperature in Station LTER-PF - DISTAV
Annual Winter Spring Summer Autumn -
0.20
0.40
0.60
0.80
1.00
1.20
chlro
phyl
l-a (µ
g L-
1)
1987-1994 (Light grey) 2000-11 (Dark grey)
1985-1995Licandro & Ibanez
(2000)
Site C
2003-2014DISTAV
Site LTER - PF
Purpose
The comparison had the purpose of determining any changes in the
mesozooplankton structure and in the trophic network
Sampling plan1985-1995
Site CLicandro &
Ibanez (2000)
2003-2014 Site LTER – PF
DiSTAV
Depth site 80 m 85 m
Column sampled 0 – 60 m 0 – 50 m
Instrument Bongo 335 µm
WP2/Bongo 200 µm
Materials and methods
Skjoldal et al. Progress in Oceanography 108 (2013) 1–42
400 µm
300 µm
200 µm+ 100%
+ 50% + 50%
Max dimension < 1 mm
Medium little and little size
Max dimension > 1mm
medium and big size
Classe dimensionale Taxa Ind/m3/anno %
G Appendicularia, Thaliacea, Chaetognatha, Cnidaria 18,86 18,4
M Copepoda 69,90 68,1MP Copepoda 6,39 6,2P Cladocera 7,54 7,3
102,68 100,0
Sito C 1985-1995Classe dimensionale Taxa Ind/m3/anno %
G Appendicularia, Thaliacea, Chaetognatha, Cnidaria 94,35 23,3
M Copepoda 100,90 24,9MP Copepoda 180,39 44,5P Cladocera 29,32 7,2
404,97 100,0
Sito LTER - PF 2003-2014
Sito C 1985-1995 Sito LTER - PF 2003-20140
50100150200250300350400450
PMP MG
Ind/
m3 L
MLMB
Total abundance for each size class
12.13%
51.79%20.70%
15.38%Sito LTER - PF 2003-2014
9.40%
73.41%
6.81%10.39%
Sito C 1985-1995
CarnivorousDetritivoresSospensivorusHerbivores and Onnivores
Trophic web changes
Fritilla
ria sp
p.
Doliolum
spp.
Salpid
ae
Sagit
ta spp
.
Sipho
noph
ora
Acartia
clausi
Centro
page
s typ
icus
Isias c
lavipe
s
Temora
stylif
era
Nanno
calan
us mino
r
Classe
B
Oithon
a sim
ilis
Evad
ne sp
inifera
Oncaea
spp.
Parac
alanu
s parv
us
Corycae
us spp
.
Classe
C
Oikople
ura sp
p.
Podo
n spp
.
Hydroz
oa0
102030405060708090
Average annual abundances
Station C 1985-1995 Station LTER - PF 2003-2014
Ind/
m3
Friedman Test - p<0.05
Gen Feb Mar Apr Mag Giu Lug Ago Set Ott Nov Dic0
102030405060708090
Oikopleura spp.
Sito C
Sito LTER - PF in
d m
-3
Gen Feb Mar Apr Mag Giu Lug Ago Set Ott Nov Dic0
50
100
150
200
250Paracalanus parvus
Sito C
Sito LTER-PF in
d m
-3
Some conclusions• Sospensivor gelatinous are
increasing like Oikopleura spp. • Detritivores are really increasing?The temperature increase is going to
change the quality and quantity mesozooplankton community?
The comparision was based on Skjoldal et al.
There are some problems about this:• Studies in Bering Sea• Different net meshes• Not enough data for to create a good
correction index
These were only some of the results obtained.
The complexity of the comparison and the problems found leads me to increase the studies and to start new research projects
to finish it.