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The paper questions the usefulness of the static concept of the habitat as a templet in analyses of the influence of the riparian environment on the dynamics of riverine fish assemblages. Studies on the effect of deforestation on the water quality and invertebrate assemblages in upland streams in mid-Wales found that changes in the nature of the riparian habitat caused by logging had relatively few...
Fish are heavily influenced by the nature of the flood regimes of the rivers in which they live. These fluctuate naturally from year to year but recently increasing pressure on water for a wide range of uses other than fisheries has led to human activities that have substantially altered the flood regimes of many rivers throughout the world. This has resulted in the loss of fish production and biodiversity...
The influence of coccidia on starling nestlings was analyzed. Isospora sp. was found in 67% of starling broods. Although some broods were heavily infected with Isospora sp., nestlings from most infected nests were on average heavier and had longer wings than nestlings from low infection and non-infected nests. Apparently, nestlings that were better fed, had also greater chance of being infected with...
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