By Werner Suter (auth.), Joseph J. Kerekes (eds.)
Birds are a vital part of so much freshwater ecosystems (lakes, rivers, wetlands) yet their position within the trophic dynamics of those water our bodies has frequently been neglected. As a conspicuous a part of the biota of water our bodies, aquatic birds are symptoms in their trophic kingdom either when it comes to species composition (quality) in addition to occupancy and breeding (quantity). Birds can also impact the trophic nation of a water physique through uploading foodstuff (.e.g. resident or migrating birds feeding on adjoining watersheds or the sea). as a result of anthropogenic actions, predation or their mobility, birds would possibly not make the most of differently appropriate aquatic habitat. those components complicate the connection among aquatic chicken creation and the trophic prestige of habitats. to that end, the position of aquatic birds in freshwater ecosystems has often been neglected.
This quantity features a wide variety of papers chosen from these offered on the symposium and reviewed.
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Additional info for Aquatic Birds in the Trophic Web of Lakes: Proceedings of a symposium held in Sackville, New Brunswick, Canada, in August 1991
In Windermere from 1944-1962. J. animo Eco!. 37: 115-157. , 1980. Distribution and production of submerged macrophytes in Tipper Grund (Ringk0bing Fjord, Denmark), and the impact of waterfowl grazing. J. app!. Ecol. 17: 675-687. Mohr-Markmann, 1984. Undersogelser af fiskebestanden i Sja:lso. Greater Copenhagen Council, Copenhagen. Muus, B. , 1978. Europas ferskvandfisk. c. Gads Forlag, Copenhagen. Nielsen, L. L. & L. Povlsen, 1985. )) i Esrum So 1983. Thesis, Inst. Freshwat. , Copenhagen University.
Gardarsson, 1979), but yearlings of the other species considered here apparently occur only exceptionally. e. the return oflocally produced young to the breeding grounds. Immigration, or redistribution, of available birds from a wider area was presumably the main proximate factor determining increases in spring densities of Scaup and Scoter. This is suggested by the significant positive association (Table 3) found between spring population change and reproductive success one year previously in these species which are rare or absent as yearlings in the study area.
WT = weighted total of chironomids and Simulium; weighting factors estimated from coefficients in the multiple regression formula. 43 Xl' where Y = total young Barrow's Goldeneye, XI = chironomids at Myvatn, and X 2 = Simulium. 0 1. 23 Table 4. Multiple regression coefficients (fJ) of the change in numbers (log (Nt/Nt _ I)) of moulting drakes at Myvatn in successive years 1978-89 on food in the same year and the numbers of young produced in three previous years. The independent variables are food, as log number of most likely insect foods trapped before 20 July in the same year, and the numbers of young per female (arcsin transformed proportions) in the three preceding years.
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