Temporal variation in Lake Balaton and its fish populations
Identifieur interne : 001278 ( Istex/Corpus ); précédent : 001277; suivant : 001279Temporal variation in Lake Balaton and its fish populations
Auteurs : P. BírSource :
- Ecology of Freshwater Fish [ 0906-6691 ] ; 1997-12.
English descriptors
- KwdEn :
Abstract
Abstract— Dramatic changes have occurred in Lake Balaton in the last 40–45 years. Variations in water quality have resulted in a decrease in fish and invertebrate diversity. Fish assemblages have changed in response to human‐induced eutrophication, environmental perturbations, introduction of exotic fish species, over‐fishing and species‐habitat interactions. Fish biomass and productivity first increased during the early 1970s with enhanced primary production, then decreased with the reduction of exploitation since the late 1970s and induced intra‐ and interspecific competition. Previous stable populations began to oscillate, and the majority of stocks became fragile by the mid‐1980s. Extinction of native fish and invasion of new alien species alternate. Alien species have transformed the food webs, causing long‐lasting ecological changes. Reduced and non‐selective exploitation has resulted in higher fish density and lower production rates. Recent studies have revealed differences in the carrying capacity of fish between the littoral zone and the open water areas.
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DOI: 10.1111/j.1600-0633.1997.tb00163.x
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<front><div type="abstract" xml:lang="en">Abstract— Dramatic changes have occurred in Lake Balaton in the last 40–45 years. Variations in water quality have resulted in a decrease in fish and invertebrate diversity. Fish assemblages have changed in response to human‐induced eutrophication, environmental perturbations, introduction of exotic fish species, over‐fishing and species‐habitat interactions. Fish biomass and productivity first increased during the early 1970s with enhanced primary production, then decreased with the reduction of exploitation since the late 1970s and induced intra‐ and interspecific competition. Previous stable populations began to oscillate, and the majority of stocks became fragile by the mid‐1980s. Extinction of native fish and invasion of new alien species alternate. Alien species have transformed the food webs, causing long‐lasting ecological changes. Reduced and non‐selective exploitation has resulted in higher fish density and lower production rates. Recent studies have revealed differences in the carrying capacity of fish between the littoral zone and the open water areas.</div>
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<abstract lang="en">Abstract— Dramatic changes have occurred in Lake Balaton in the last 40–45 years. Variations in water quality have resulted in a decrease in fish and invertebrate diversity. Fish assemblages have changed in response to human‐induced eutrophication, environmental perturbations, introduction of exotic fish species, over‐fishing and species‐habitat interactions. Fish biomass and productivity first increased during the early 1970s with enhanced primary production, then decreased with the reduction of exploitation since the late 1970s and induced intra‐ and interspecific competition. Previous stable populations began to oscillate, and the majority of stocks became fragile by the mid‐1980s. Extinction of native fish and invasion of new alien species alternate. Alien species have transformed the food webs, causing long‐lasting ecological changes. Reduced and non‐selective exploitation has resulted in higher fish density and lower production rates. Recent studies have revealed differences in the carrying capacity of fish between the littoral zone and the open water areas.</abstract>
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