Post on 16-Dec-2015
Martín E. Hernández Rivas, Sylvia P. A. Jiménez Rosenberg, Alejandro Hinojosa Medina, Ricardo
Saldierna Martínez y Gerardo Aceves Medina.CICIMAR-IPN
mrivas@ipn.mx
INSTITUTO POLITÉCNICO NACIONALCENTRO INTERDISCIPLINARIO DE CIENCIAS
MARINASDEPARTAMENTO DE PLANCTON Y ECOLOGÍA
MARINA
STUDY AREA
Arriaga Cabrera, L., E. Vázquez Domínguez, J. González Cano, R. Jiménez Rosenberg, E. Muñoz López, V. Aguilar Sierra (coordinadores). 1998. Regiones marinas prioritarias de México. Comisión Nacional para el Conocimiento y uso de la Biodiversidad
Canal de DeweyIsla Natividad
Isla San Benito
Isla Cedros
W116.0 115.0 114.0 113.0 112.0
27.0
28.0
29.0
30.0
Sonora
Pacific Ocean
U .S.N
PuntaCanoas
PuntaBlanca
PuntaBaja
Laguna Manuela
Laguna Ojo de Liebre
Bahía Tortugas
Laguna Guerrero Negro
Punta Eugenia
Canalde Keller
200 m
2000 m
1000 m
STUDY AREA
MATERIAL AND METHODS
The IMECOCAL program has conducted oceanographic expeditions every three months since 1997 to date with the aim to monitor the southern region of the California Current, by means of similar methodology to that implemented for the CALCOFI program. CTD, the CUFES system for fish eggs sampling, and Bongo and Calvet nets have been used as sampling devices.
Fish larvae obtained with oblique bongo tows (60 cm diam. and 500 mesh), were separated and identified to the minimum possible taxon. The sardine larvae identified were grouped into four development stages, namely: preflexion, flexion, postflexion and transformation.
The larval abundance was normalized to 10 m2 sea surface and larval indexes were computed. The census estimations were adjusted to the area in order to prevent that the area factor would augment them.
-118 -116 -114 -112 -110 -108 -10622
24
26
28
30
32
IMECOCAL 1997-2002Sardinops sagax
Average
0 1 10 20 30 40 50
-118 -116 -114 -112 -110 -108 -10622
24
26
28
30
32
IMECOCAL 1997-2002Sardinops sagax
0 1 10 50 100 250 500
Tota l
RESULTS
Distribution and Abundance of Sardinops sagax larvae2003 is not included because the low numbers of larvae
0
7
2 2
4
4
10
23
4
8
4
6
1
5
1
3
4
10
3
01
00
2
4
6
8
10
12
9710
9801
9804
9807
9810
9901
9904
9908
9910
0001
0004
0008
0010
0101
0104
0107
0110
0201
0204
0207
0210
0301
0304
0307
0310
Positive stations in Sebastián Vizcaíno Bay
The red dot indicate only 3 sampled stations in this cruise
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
9710
9801
9804
9807
9810
9901
9904
9908
9910
0001
0004
0008
0010
0101
0104
0107
0110
0201
0204
0207
0210
0301
0304
0307
0310
Po
sitiv
e S
tatio
ns
Cruise
IMECOCAL Index
IMECOCAL INDEX, % POSITIVE STATIONS
ONLY 3 STATIONS SAMPLED IN THIS CRUISE
0.000.050.100.150.200.250.300.350.400.450.50
9801 9901 0001 0101 0201 0301
Positi
ve S
tatio
ns
Winter Cruises
IMECOCAL Index-January
0.000.050.100.150.200.250.300.350.400.450.50
9807 9908 0008 0107 0207 0307
Positi
ve S
tatio
ns
Summer Cruises
IMECOCAL Index-July
0.000.050.100.150.200.250.300.350.400.450.50
9710 9810 9910 0010 0110 0210 0310
Positi
ve S
tatio
ns
Fall Cruises
IMECOCAL Index-October
0.000.050.100.150.200.250.300.350.400.450.50
9804 9904 0004 0104 0204 0304
Positi
ve S
tatio
ns
Spring Cruises
IMECOCAL Index-April
IMECOCAL INDEX BY MONTH
-4
-2
0
2
4NORTH ( 0 - 50 m )
T a
no
ma
ly (
o C )
-4 -2 0 2 4
ME
I
1998 2000 2002 2004 2006 2008 -4
-2
0
2
4
T a
no
ma
ly (
o C )
SOUTH ( 0 - 50 m )
-4 -2 0 2 4
ME
I
R. Durazo, et al. 2005
120 118 116 114 112
Longitud W
24
26
28
30
32
Lat
itu
d N
Región 2
Región 1
Durazo et al., 2005
TEMPERATURE
120 118 116 114 112
Longitud W
24
26
28
30
32
Lat
itu
d N
Región 2
Región 1
Durazo et al., 2005
SALINITY
0
10000
20000
30000
40000
50000
60000
70000
9710
9801
9804
9807
9810
9901
9904
9908
9910
0001
0004
0008
0010
0101
0104
0107
0110
0201
0204
0207
0210
0301
0304
0307
0310
LARV
AL
IND
EX 1
0^6
IMECOCAL CRUISES
Sardinops sagax
LARVAL INDEX BY CRUISE IN S. VIZCAÍNO BAY
CONCLUSIONS
• The tendency of de abundance of sardine larvae en Sebastián Vizaíno area is to decrease.•The presence of larvae of temeprate stock was more abundant during all period.•The larvae of cold stock was found in the spring IMECOCAL cruises, increased from April 1999 to April 2002, after that dissapear in the area.•The IMECOCAL Index (N+/NT), in general decreased from August 1999 to October 2003.