56 research outputs found
Strategic ecosystem studies of large slow flowing lowland rivers. Progress report: April - October 1989
This report covers the period April to September, 1989. During this period sampling of invertebrates has concentrated on planktonic animals and those associated with one of the dominant macrophytes in the system, Nuphar lutea, the yellow water lily, since these are particularly important in the diets of larval and juvenile cyprinid fish. A proportion of samples has been partly analysed and some preliminary data are presented here
Biological surveillance of chalk-streams
An article reviewing the methods of biological surveillance of chalk-streams developed and commonly used at that time, with a focus on their application to the River Frome catchment in Dorset. In evaluating the surveillance methods, the author looks at sampling methods (including cores and kick-sampling), the level of identification of macroinvertebrates, and temporal and spatial variations. Responses of indices to organic pollution are also discussed. A number of accompanying figures are also included
The Chironomidae and their ecology in chalk streams
The taxonomy of the family Chironomidae is first discussed in this article, since there is considerable confusion over nomenclature. The author goes on to consider various aspects of the ecology of the family in chalk streams; preliminary studies on a reach of the Tadnoll Brook supplying most of the information
Strategic ecosystem studies of large slow flowing lowland rivers. Progress report: April - October 1990
Parapentaneura bentogomensis Stur, Fittkau et Serrano (Diptera, Chironomidae, Tanypodinae) taken in Southeastern, Brazil: additional characters and modified generic diagnosis
Ocorrência de Polypedilum (Tripodura) amataura Bidawid-Kafka, 1996 (Diptera; Chironomidae) em Aquascypha hydrophora (berk.) Reid (Fungi; Stereaceae), com descrição da pupa na Amazônia Central, Brasil
Leaf litter as a possible food source for chironomids (Diptera) in Brazilian and Portuguese headwater streams
Is similar the distribution of Chironomidae (Diptera) and Oligochaeta (Annelida, Clitellata) in a river and a lateral fluvial area?
Origin of freshwater fauna of the North-Atlantic islands: present distribution in relation to climate and possible migration routes
- …