Náttúrufræðingurinn - 2006, Blaðsíða 48

Náttúrufræðingurinn
were in accordance with standardized
methods, e.g. ASTM 2001 (Standard
Guide for Conducting In-situ Field
Bioassays with Caged Bivalves).
When mussels are kept in cages sever-
al factors need to be considered. The con-
dition of the cages and mussels must be
inspected. In the Hvalfjordur in-
vestigations, such inspection was made
when the mussels had been in their cages
for about one month, at which time their
spawning season was expected to be
completed. The cages were almost cover-
ed with 1-2 mm juvenile mussels that
were removed with a brush. It is also nec-
essary to keep the mussels in their cages
for at least 1 month after the spawning
season so that they can accumulate en-
ough pollution to compensate for the am-
ount that was possibly removed by the
spawning. Furthermore, the mussels
should not be kept in the cages for too
long, since several studies have sugge-
sted that, e.g. in metal polluted water, the
mussels can adjust to the situation by
forming metallothioneins that can bind
metal ions and lead to their excretion
from tissues. Also, the risk of damage to
the cages and associated equipment can
increase with prolonged time in the wa-
ter. Finally the risk of damage is reduced
during summer, when storms, ice forma-
tion and large waves are not as signi-
ficant as in other seasons.
The investigations in Hvalfjordur dur-
ing the summer of 2004 indicate that if
the mussels are in good physical condi-
tion at the beginning of their deploy-
ment, if they are able to filter seawater
continuously the entire time within the
cages, and if they have large enough
space to grow, the mussels are expected
to stay healthy within the cages during
the investigation period. This is import-
ant since the concentration of pollutants
measured in the tissues of healthy mussel
tends to reveal the most accurate pollu-
tion levels of seawater in the area, part-
icularly for the bioavailable pollutants.
The results of chemical measurements
of soft tissue from the mussels in Hval-
fjordur suggest that so far the impact of
the plants within the fjord is small regar-
ding the accumulation of pollutants in
marine organisms in the vicinity. The
amount of PAH, heavy metals and other
inorganic substances was below or at the
analyzing limits of the method used
except for the PAH substance
benzo(a)pyren in mussels from two sta-
tions, at 5 m depth, north of the harbour
at Grundartangi. However, the amount
is well below the critical limits for the
substance in food/mussels in the EU
countries and Norway. Despite the low
amount of pollutants measured in the
soft tissue from mussels in Hvalfjordur
the results of the chemical measurements
reveal that regular monitoring of the
marine organisms in the vicinity of the
plants is necessary.
Heimildir
1. Chase, M.E., Jones, S.H., Hennigar, P., Sowles, ]., Harding G.C.H.,
Freeman, K., Wells, P.G., Krahforst, C., Coombs, K., Crawford, R.,
Pederson, J. & Taylor, D. 2001. Gulfwatch: Monitoring spatial and
temporal pattems of trace metals and organic contaminants in the
Gulf of Maine (1991-1997) with the Blue Mussel, Mytilus edulis L.
Marine Pollution Bulletin 42 (6). 490-504.
2. Granmo, Á. 1995. Mussels as a tool in impact assessment. Phuket
marine biololical Center Special Publication 15. 215-220.
3. 01berg, E., 1998. Blue mussel (Mytilus edulis) as a bioindicator for
Marine contamination with Polycyclic Aromatic Hydrocarbons
(PAH) and heavy metals. M.Sc. Applied Environmental Science.
RFRogaland Research, Stavanger Norway.
4. Granby, K. & Spliid, N.H. 1995. Hydrocarbons and Organochlorines
in Common Mussels from the Kattegat and the Belts and their
relation to condition indices. Marine Pollution Bulletin 30 (1). 74-82.
5. Connell, D.W., Wi, R.S.S., Richardson, B.J., Leung, K., Lam, P.S.K. &
Connell, P.A. 1997. Occurrence of persistent organic contaminants
and related substances in Hong Kong marine areas: an overview.
Marine Pollution Bulletin 36. 376-384.
6. Walker, C.H., Hopkin, S.P., Sibly, R.M., Peakall, D.B. 2001. Principles
of Ecotox icology (2nd ed.). New York: Taylor «& Francis.
7. Alþjóðaheilbrigðismálastofnunin (WHO) 1998. Environmental
Health Criteria 202. Selected Non-heterocyclic polycyclic aromatic
hydrocarbons. Intemational programme on chemical safety.
8. Leung, K.M.Y., Jörundur Svavarsson, Crane, M. & Morritt, D. 2002.
Influence of static and fluctuating salinity on cadmium uptake and
metallothionein expression by the dogwhelk Nucella lapillus (L.).
Joumal of Experimental Marine Biology and Ecology 274 (2). 175-189.
9. Guðjón Atli Auðunsson, Elín Ámadóttir, Helga Halldórsdóttir, Joan
Ribera Vano, Martin Eamon Tighe & Þuríður Ragnarsdóttir 2001.
Könnun á ólífrænum snefilefnum og arómatískum fjölhringjum
(PAH) í kræklingi við Grundartanga, Hvalfirði, sumarið 2000. Rann-
sóknastofnun fiskiðnaðarins, verkefnaskýrsla 03-01.
10. Jóhanna Björk Weisshappel & Halldór Pálmar Halldórsson 2005.
Mengunarálag sjávar utan við Grundartanga og Katanes í Hvalfirði
vaktað með hjálp kræklings. Hönnun hf. og Rannsóknarstofa í sjávar-
líffræði.
11. Guðjón Atli Auðunsson, Elín Árnadóttir, Taru Uusinoka & Þuríður
Ragnarsdóttir 2005. Könnun á ólífrænum snefilefnum og fjölhringja
kolvatnsefnum (PAH) í kræklingi við Grundartanga, Hvalfirði,
haustið 2004. Rannsóknastofnun fiskiðnaðarins.
12. Salazar, M.H. & Salazar, S.M. 2001. Standard Guide for Conducting
In-situ Field Bioassays with Caged Bivalves. American Society for
Testing and Materials (ASTM), 2001 Annual Book of ASTM Stand-
ards, Designation: E 2122 02.
13. Davíð Egilson, Elísabet D. Ólafsdóttir, Eva Yngvadóttir, Helga Hall-
dórsdóttir, Flosi Hrafn Sigurðsson, Gunnar Steinn Jónsson, Helgi
Jensson, Karl Gunnarsson, Sigurður A. Þráinsson, Andri Stefánsson,
Hallgrímur Daði Indriðason, Hreinn Hjartarson, Jóhanna Thorlacius,
Kristín Ólafsdóttir, Sigurður R. Gíslason & Jörundur Svavarsson 1999.
Mælingar á mengandi efnum á og við ísland. Niðurstöður vöktunar
mælinga. Starfshópur um mengunarmælingar, mars 1999, Reykjavík.
138 bls.
14. Evrópusambandið 2005. Commission regulation no. 208/2005.
Official Joumal of the European Union.
15. Molvær, J., Knutzen, J., Magnusson, )., Rygg, B., Skei, J. & Sorensen,
J. 1997. Klassifisering av miljokvalitet i fjorder og kystfarvann.
Veiledning 97:03 Statens forurensningstilsyn (SFT).
Um höfund
Jóhanna B. Weisshappel lauk meistaranámi í
sjávarlíffræði frá Háskóla íslands 1996. Sam-
hliða námi var hún aðstoðarkennari við líf-
fræðiskor Háskólans og aðstoðarmaður við
botndýrarannsóknir á Líffræðistofnun Háskól-
ans. Árið 1997 vann hún hjá Alþjóðahafrann-
sóknaráðinu (ICES) í Kaupmannahöfn og
1998-1999 á Líffræðistofnun Háskólans. Frá ár-
inu 2000 hefur hún unnið að verkefnum sem
tengjast umhverfisvöktun, mati á umhverfisá-
hrifum, grænu bókhaldi og ýmsu öðru sem lýt-
ur að mengunarmálum og lífríki hjá Hönnun
hf., ráðgjafarfyrirtæki og verkfræðistofu.
PÓSTFANG HÖFUNDAR/AUTHOR’S ADDRESS
Jóhanna Björk Weisshappel
jw@honnun.is
Hönnun hf.
Grensásvegi 1
IS-108 Reykjavík
108