Littoral fish communities in the Archipelago Sea, SW Finland : a preliminary study of changes over 20 years

A collapse of the littoral fish populations was found in the middle archipelago zone near the Island of Seili (northern Baltic Sea) when fish populations were studied in summer 1996 in a comparable way with earlier studies done in the early 1970s and 1980s. A similar comparison was made in the outer...

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Bibliographic Details
Published in:Hydrobiologia 1999-01, Vol.393 (1-3), p.253-260
Main Authors: RAJASILTA, M, MANKKI, J, RANTA-AHO, K, VUORINEN, I
Format: Article
Language:English
Subjects:
Animal and plant ecology
Animal populations
Animal, plant and microbial ecology
Archipelagoes
Biological and medical sciences
Eutrophication
Fish
Fish populations
Fundamental and applied biological sciences. Psychology
Marine ecology
Pisces
Sea water ecosystems
Synecology
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Summary:A collapse of the littoral fish populations was found in the middle archipelago zone near the Island of Seili (northern Baltic Sea) when fish populations were studied in summer 1996 in a comparable way with earlier studies done in the early 1970s and 1980s. A similar comparison was made in the outer archipelago (the islands off the island of Utö), but no evident change was found. Reasons for the decline in littoral fish stocks are discussed, but no single-cause effect can be pointed out. Among possible explanations is a substantial increase of eutrophication in the middle archipelago together with increasing ferry traffic which both cause structural changes in the littoral environment of the study area.[PUBLICATION ABSTRACT]
ISSN:0018-8158
1573-5117
DOI:10.1023/A:1003523308309