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1.
Ambio ; 30(4-5): 202-9, 2001 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-11697251

RESUMO

The biogeographical peculiarities of the Baltic Sea have developed since the last glacial period. The characteristic mixture of marine, brackish water, and freshwater species, and relicts from previous periods in the Baltic, is threatened by ongoing environmental changes. This review focuses on the recent impacts of nonindigenous species, eutrophication, and a temporary oxygen deficit in the deep basins, on the biogeographical integrity of the Baltic on different spatial and time scales. Today the biota of brackish waterbodies are exposed to each other because of the breakdown in geographical barriers due to shipping traffic, leading to an exchange of species and further homogenization of aquatic animal and plant life worldwide.


Assuntos
Ecossistema , Eutrofização , Navios , Água/química , Animais , Países Bálticos , Conservação dos Recursos Naturais , Geografia , Hipóxia , Plantas , Dinâmica Populacional
2.
Mar Environ Res ; 51(3): 229-45, 2001 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-11468967

RESUMO

Long-term changes in sediment macrofauna communities at two sites affected by fish farming in the Archipelago Sea, south-west Finland have been investigated. Sampling stations in the Särkänsalmi Strait and Kaukolanlahti Bay, previously investigated 1982-1991, were revisited in 1994, 1995 and 1998 to detect signs of recovery following a decrease in organic load since 1990 and 1991, respectively. The results indicate a partial recovery in Särkänsalmi during post-pollution years, whereas no improvement has taken place in Kaukolanlahti. The improvement in Särkänsalmi is shown by a significant increase in the number of species and total abundance, and by the community structures becoming more similar over time. On the other hand, a significantly decreased number of species, abundance and biomass values over time as well as the occurrence of defaunated anoxic sediments, are clear signs of continued deterioration in Kaukolanlahti. Differences in the recovery potential of the two water areas are interpreted as consequences of topography and water exchange patterns causing differences in oxygen saturation.


Assuntos
Aquicultura , Ecossistema , Eutrofização , Poluição da Água/prevenção & controle , Animais , Biomassa , Monitoramento Ambiental , Finlândia , Sedimentos Geológicos/química , Dinâmica Populacional
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