Non-indigenous species in the Romanian BlackSea littoral zone: Mya arenaria, Rapana venosa
and others
Marian-Traian Gomoiu
GeoEcoMar, Constantza, Romania
curriculum in natural environmental science, 2005
0
10
20
30
40
+10 +20 +30 +40 +50 +60 +70 +80 +90
Size classes - mm
Freq
uenc
y - %
1970
1971
Length classes frequency of Mya arenaria shells from beach deposits
curriculum in natural environmental science, 2005
Comparative quantitative distribution of Mya arenaria populations at the Romanian Black Sea littoral in 1982 vs. 1974
curriculum in natural environmental science, 2005
10
100
1000
10000
100000
1955 1960 1965 1970 1975 1980 1985
Den
sity
- s
ps.
m-2
Corbula Mya
100
1000
10000
100000
1000000
10000000
1955 1960 1965 1970 1975 1980 1985
Y e a r sB
iom
ass
- m
g.m-2
Variation of Mya arenaria stocks
0
500000
1000000
1500000
1973 1974 1975 1976 1977 1978 1979 1980 1981
Y e a r s
T o
n s
Quantitative variation of Corbula mediterranea and Mya arenaria populations from the Black Sea sedimentary bottoms between Danube mouth and Constanta
curriculum in natural environmental science, 2005
Constancy (% ) of populations
0
50
100
4m 9m 15m 22m 30m 35m
Bathimetric zones
Con
stan
cy -
%
Mean density and biomass
1
10
100
1000
Bathimetric zones
Bio
mas
s -
g.m
-
2
110100100010000
Den
sity
-
sps.
m-2
B-81D-81
Minimum and maximum densities and biomasses
1
10
100
1000
10000
100000
4m 9m 15m 22m 30m 35m
Bathimetric zones
Den
sity
- sp
s.m
-2
1
10
100
1000
10000
Bio
mas
s - g
.m-2
Dmin Dmax Bmin Bmax
Elements for synoptic analysis of Mya arenaria population in 1981
curriculum in natural environmental science, 2005
Frequency (%) of main molluscs species at different depths in 1981 at the Romanian littoral of the Black Sea, including nuclei delimitation of communities formation
(Ce-Cardium edule lamarckiMy - Mya arenaria Cb - Corbula mediterranea Mg - Mytilus galloprovincialisSs - Spisula subtruncata Pr - Paphia rugata Cp - Plagiocardium papillosum)
curriculum in natural environmental science, 2005
Average biomass of molluscs
1 10 100 1000 10000 100000 1000000
Hy - Hydrobia ventrosa
Tt - Tellina tenuis
Cp - Acanthocardia paucicostata
Nr - Nassarius reticulatus
Pr - Paphia rugata
Ce - Cardium edule
My - Mya arenaria
Biomass - mg.m-2
Structure of molluscs biomass - 322 g.m-2
My73%
Ss0%
Pr0%
Sy0%
Cb1%
Ce3%
Mg23%
Ch0%
Tt0%
Cp0%
Hy0% Cy
0%Nr0%
Average structure of molluscs biomass on the sedimentary bottomsat the Romanian Black Sea littoral in the beginning of 1980s
curriculum in natural environmental science, 2005
0 50 100 150 200 250 300
I
III
V
VII
IX
XITra
nsec
ts fr
om S
ulin
a - D
anub
e D
elta
(I) t
o M
amai
a - C
onst
anta
(X
I)Tons*10
3
Spatial distribution of Mya arenaria losses by mass mortalityat the Romanian Black Sea coast.
curriculum in natural environmental science, 2005
0
10
20
30
40
50
60
70
80
Mya arenaria
Hydrobia ventrosaMytilus galloprovincialis
Corbula mediterranea
Cardium edule lamarcki
Scapharca inaequivalvis
Rissoa splendida
Chrysallida interstincta
Retusa truncatula
Chione gallinaAbra albaTellina tenuis
Eulimella nitidissima
Cyclonassa neritea
Syndesmia fragilis
Spisula subtruncata
Nassarius reticulatus
Cerithiolum sp.
Cardium simile
Cardium paucicostatumBarnea candida
1960-1961 1986-1990
Comparative situation of molluscs associations ante- (1960-1961)and post- (1986-1990) Mya arenaria introduction into the Black Sea
curriculum in natural environmental science, 2005
The expansion ways into the Black Sea of some immigrant species:Rapana venosa, Rithropanopaeus harrisii and Menmiopsis leidyi
curriculum in natural environmental science, 2005
0
20
40
<50 +50 +60 +70 +80 +90 >100
Size classes - mm
Perc
enta
ge -
%
Sandy bottoms Rocky bottoms
Average size class structure of Rapana venosa populationsliving on sandy and rocky bottoms
curriculum in natural environmental science, 2005