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- Newsgroups: soc.culture.nordic
- Path: sparky!uunet!mcsun!sunic!ugle.unit.no!alf.uib.no!rmanne-pc.kj.uib.no!nkjrm
- From: nkjrm@taxus.uib.no (Rolf Manne)
- Subject: Re: Moen's Klint - pollution
- Message-ID: <nkjrm.107@taxus.uib.no>
- Sender: usenet@alf.uib.no (Bergen University Newsaccount)
- Organization: University of Bergen
- References: <1jm6hgINNebr@vttux1.vtt.fi> <1993Jan22.112534.1@jt.dk>
- Date: Fri, 22 Jan 1993 14:58:08 GMT
- Lines: 40
-
- In article <1993Jan22.112534.1@jt.dk> linaa_all@jt.dk writes:
-
-
- >There is only one way out, for the polluted water: Through the narrow Danish
- >straits, and it's symptomatic, that the pollution is concentrated on the
- >southern parts, where the Danish islands stops the tidal change of water.
-
- >You were absolutely right when you stated, that the water smelled like
- >a Russian toilet - "It is!"
-
- In a previous communication I have told about some natural causes that
- may cause bad smells and bad-looking water. I would like to continue here
- concerning a possible misunderstanding of the nature of pollution:
-
- Most organic pollutants become a part of the "nutritional chain" (whatever
- it is called in English) for the various organisms living in the water.
- The toilet contents from Russia and Poland thus first get "eaten" by
- bacteria and other microorganisms (algae) then by small animals and
- finally by larger animals (fish, sea-birds, seals and men). The first of
- these naturally occuring steps are enhanced in sewage treatment plants
- (so-called biological treatment).
-
- When this chain goes wrong it is due to overproduction of one or the
- other species. A few years ago Norway, Sweden and Denmark thus saw a lot
- of fish death caused by the unusual growth of poisonous microscopic algae.
- This was most likely caused by an unusual combination of nutrients
- in the North Sea and adjoining waters which was influenced by human
- pollution as well as by meteorological conditions.
-
- The basic problem of the Baltic is in the distribution of fresh and
- salt water which don't mix well enough and which leads to an unusual
- flora and fauna. Only a few sea-weeds can take brackish water, and some
- of those which can, grow much larger than in pure salt water because of
- limited competition. If the Baltic was all fresh-water it would most
- likely appear much cleaner!
-
- Rolf Manne
- Department of Chemistry, University of Bergen
-
- e-mail: Rolf.Manne@uib.no
-