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International Journal of Marine Science 2014, Vol.4, No.20: 183-193
http://ijms.sophiapublisher.com
185
meteorological characteristics impact or determine the
behaviour and distribution of aquatic organisms, in
this work a seasonal and spatial variation analysis is
presented to Guacanayabo’s Gulf in the 2008-2009
period and its possible relation with the decrease of
commercial captures of
Farfantepenaeus notialis
.
1 Results
1.1 Variations of hydrometeorological parameters
and pink shrimp catches
1.1.1 Monthly performance of climatic variables
The raining period (May-October) is very well
observed in relation with measured meteorological
variables, with positive anomalies (Figure 2). For the
historical mean, two main peaks of raining are very
well defined, From May to June and from August to
September according to registered data. For each year
the monthly variations of climatic parameters showed
different tendencies. The maxima of positive
precipitation anomalies in 2008 were manifested in
spring, with highest value in March and a second peak
in the transition month, August, from summer to
autumn. On the other hand, in 2009 the highest levels
of precipitation were observed at the end of the spring
(May) and in autumn (October). The maxima of
positive anomalies of evaporation for the studied
months were shown in months in which raining are
decreased (Figure 2). Annual pluvial cumulate in 2008,
1181.8 mm was higher to this one of 2009 (1094.7
mm) and than general mean (1138 mm). At the same
time, the monthly mean of 2008 evaporation (64.22
mm), was lesser than in 2009 (84.92 mm; Figure 2).
Figure 2 Monthly variation of precipitation and evaporation in Manzanillo Meteorological Station for 2008 (a) and 2009 (b). General
average 1974 – 2007 means for rainfall.
1.1.2 Hydrological parameters
Vertical distribution of analyzed markers did not
exhibit significant differences between surface and
bottom, meaning that there is a homogeneous
variation in water column. Standard deviations on
sampling network sites indicate little variation among
them (data not shown). On the other hand, lineal
regression between pairs of each marker indicates a
high dependence of bottom values in relation to the
surface ones (Table 1).
Table 1. Average values of physic and chemical water’s markers in Guacanayabo’s Gulf for 2008 and 2009 years.
Parameter
Unit
Level
Mean
Valid N
Min.
Max.
Std.Dev.
Regression
Temperature
℃
surface
bottom
29.78
29.51
174
174
25.0
24.8
32.8
32.2
1.48
1.45
R²=0.97
Salinity
psu
surface
bottom
34.63
34.71
174
174
30.2
31.2
36.6
36.0
1.07
0.96
R²=0.91
Dissolved
Oxygen
mg/L
surface
bottom
5.11
4.74
174
174
3.3
2.9
6.6
6.7
0.86
0.84
R²=0.76
CDO
mg/L
surface
bottom
1.64
1.60
151
151
0.2
0.0
6.5
6.2
1.13
1.10
R²=0.79