BSEP116B Biodiversity in the Baltic Sea - Helcom
BSEP116B Biodiversity in the Baltic Sea - Helcom
BSEP116B Biodiversity in the Baltic Sea - Helcom
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
Biomass (wet weight, mg per m 2 )<br />
Biomass (wet weight, mg per m 2 )<br />
35000<br />
30000<br />
25000<br />
20000<br />
15000<br />
10000<br />
5000<br />
0<br />
18000<br />
16000<br />
14000<br />
12000<br />
10000<br />
8000<br />
6000<br />
4000<br />
2000<br />
0<br />
Pseudocalanus spp.<br />
Acartia spp.<br />
Temora longicornis<br />
1979<br />
1981<br />
1983<br />
1985<br />
1987<br />
1989<br />
1991<br />
1993<br />
1995<br />
1997<br />
1999<br />
2001<br />
2003<br />
2005<br />
2007<br />
Figure 3.3.1. Biomass of copepods Pseudocalanus spp., Temora longicornis<br />
and Acartia spp. <strong>in</strong> <strong>the</strong> nor<strong>the</strong>rn <strong>Baltic</strong> Proper. FIMR monitor<strong>in</strong>g data 1979–<br />
2007, annual sampl<strong>in</strong>g (August) of HELCOM monitor<strong>in</strong>g stations.<br />
Pseudocalanus spp.<br />
Acartia spp.<br />
Temora longicornis<br />
1979<br />
1981<br />
1983<br />
1985<br />
1987<br />
1989<br />
1991<br />
1993<br />
1995<br />
1997<br />
1999<br />
2001<br />
2003<br />
2005<br />
2007<br />
Nor<strong>the</strong>rn <strong>Baltic</strong> Proper and Gulf of F<strong>in</strong>land<br />
The available monitor<strong>in</strong>g data from <strong>the</strong> past 28<br />
years showed no significant trend <strong>in</strong> overall abundance<br />
or biomass development of zooplankton <strong>in</strong><br />
<strong>the</strong> nor<strong>the</strong>rn <strong>Baltic</strong> Proper. Of <strong>the</strong> ma<strong>in</strong> zooplankton<br />
groups, copepods showed no dist<strong>in</strong>ct trend,<br />
while cladocerans displayed a downward trend.<br />
However, <strong>the</strong>re are dist<strong>in</strong>ct changes <strong>in</strong> abundance<br />
among copepod species. The copepod genus<br />
Pseudocalanus significantly decl<strong>in</strong>ed dur<strong>in</strong>g <strong>the</strong><br />
observation period (p