Seasonal Studies of a Pelagic Ecosystem (Meridian 110° E)
501
No transformation was made for other variables because it was found in general that
they were normally distributed. Fig. 14, for example, demonstrates the difference
between the cumulative frequency distributions for chlorophyll a and for zooplankton
biomass.
Table 6 shows that there are fewer significant correlations between zooplankton
and other variables than between zooplankton and the various components of the midTable 5. Correlation between representative zooplankton taxa, in tropical and subtropical zones,
by day and night. (** significant at 99% level; * significant at 95% level; N.S. not significant)
Taxa
Tropical zone
Subtropical zone
Day
Night
Day
Night
x
y
(n = 33)
(n = 35)
(n = 57)
(n = 54)
Copelata
Thaliaceae
**
**
*.
**
Copepoda
**
N.S.
**
**
Ostracoda
**
**
••
**
Coelenterata
**
**
*.
**
Chaetognatha
**
*.
**
Decapod larvae
.N.S.
•
-*
Fish eggs and larvae *.
N.S.
**
••
Thaliaceae
Copepoda
-*
**
**
**
Ostracoda
**
*
**
**
Coelenterata
-*
-*
.*
**
Chaetognatha
••
••
••
**
Decapod larvae
.*
**
**
**
Fish eggs and larvae **
N.S.
**
-*
Copepoda
Ostracoda
.*
**
**
Coelenterata
**
-**
**
Chaetognatha
*N.S.
-*
-Decapod larvae
**
**
*.
Fish eggs and larvae **
N.S.
**
**
Ostracoda
Coelenterata
***
**
**
Chaetognatha
..*
*
.*
Decapod larvae
• *
N .S .
**
*
Fish eggs and larvae *
**
**
*
Coelenterata
Chaetognatha
**
N.S.
••
**
Decapod larvae
**
*
*
**
Fish eggs and larvae **
*
**
**
Chaetognatha
Decapod larvae
**
**
*
**
Fish eggs and larvae
N.S.
**
••
Decapod Larvae Fish eggs and larvae •
N.S .
*
**
water trawl catch. However, in the tropical zone, but only in the tropical zone, zooplankton is well correlated with productivity (99% significance), phosphate (99% significance), and nitrate (95% significance); this may be surprising, since productivity is not
well correlated either with nutrients or phytoplankton. In the subtropical zone, and only
in the subtropical zone, phytoplankton is positively correlated with productivity and
negatively correlated with midwater trawl (MWT) macroplankton and plankton.
501
No transformation was made for other variables because it was found in general that
they were normally distributed. Fig. 14, for example, demonstrates the difference
between the cumulative frequency distributions for chlorophyll a and for zooplankton
biomass.
Table 6 shows that there are fewer significant correlations between zooplankton
and other variables than between zooplankton and the various components of the midTable 5. Correlation between representative zooplankton taxa, in tropical and subtropical zones,
by day and night. (** significant at 99% level; * significant at 95% level; N.S. not significant)
Taxa
Tropical zone
Subtropical zone
Day
Night
Day
Night
x
y
(n = 33)
(n = 35)
(n = 57)
(n = 54)
Copelata
Thaliaceae
**
**
*.
**
Copepoda
**
N.S.
**
**
Ostracoda
**
**
••
**
Coelenterata
**
**
*.
**
Chaetognatha
**
*.
**
Decapod larvae
.N.S.
•
-*
Fish eggs and larvae *.
N.S.
**
••
Thaliaceae
Copepoda
-*
**
**
**
Ostracoda
**
*
**
**
Coelenterata
-*
-*
.*
**
Chaetognatha
••
••
••
**
Decapod larvae
.*
**
**
**
Fish eggs and larvae **
N.S.
**
-*
Copepoda
Ostracoda
.*
**
**
Coelenterata
**
-**
**
Chaetognatha
*N.S.
-*
-Decapod larvae
**
**
*.
Fish eggs and larvae **
N.S.
**
**
Ostracoda
Coelenterata
***
**
**
Chaetognatha
..*
*
.*
Decapod larvae
• *
N .S .
**
*
Fish eggs and larvae *
**
**
*
Coelenterata
Chaetognatha
**
N.S.
••
**
Decapod larvae
**
*
*
**
Fish eggs and larvae **
*
**
**
Chaetognatha
Decapod larvae
**
**
*
**
Fish eggs and larvae
N.S.
**
••
Decapod Larvae Fish eggs and larvae •
N.S .
*
**
water trawl catch. However, in the tropical zone, but only in the tropical zone, zooplankton is well correlated with productivity (99% significance), phosphate (99% significance), and nitrate (95% significance); this may be surprising, since productivity is not
well correlated either with nutrients or phytoplankton. In the subtropical zone, and only
in the subtropical zone, phytoplankton is positively correlated with productivity and
negatively correlated with midwater trawl (MWT) macroplankton and plankton.