By Werner Suter (auth.), Joseph J. Kerekes (eds.)
Birds are an essential component of such a lot freshwater ecosystems (lakes, rivers, wetlands) yet their position within the trophic dynamics of those water our bodies has usually been neglected. As a conspicuous a part of the biota of water our bodies, aquatic birds are symptoms in their trophic nation either by way of species composition (quality) in addition to occupancy and breeding (quantity). Birds can also impact the trophic nation of a water physique by means of 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 won't make the most of another way appropriate aquatic habitat. those components complicate the connection among aquatic chicken creation and the trophic prestige of habitats. thus, the function of aquatic birds in freshwater ecosystems has often been missed.
This quantity features a wide variety of papers chosen from these provided on the symposium and reviewed.
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Extra info for Aquatic Birds in the Trophic Web of Lakes: Proceedings of a symposium held in Sackville, New Brunswick, Canada, in August 1991
The central basin is mesotrophic, the eastern areas are oligotrophic, whilst the western basin (and lower Detroit River) is distinctly eutrophic. Progressive eutrophication has been a major concern in recent decades, mainly due to run-off of phosphorus, nitrogen and other nutrients from surrounding agricultural land, as well as sewage discharges (Great Lakes Water Quality Board, 1981; Herdendorf, 1982). 2. The diverse aquatic conditions support a varied and commercially important fish resource, but the composition and structure of the fish community has been modified greatly by introductions of exotic species over the past century (Hartman, 1988).
In particular we like to thank Gisli Mar Gislason, Gudmundur A. Gudmundsson, Thora Hrafnsdottir, Erlendur Jonsson, Kristjan Lilliendahl, Olafur K. Nielsen and Jon S. Olafsson for help in field and laboratory work. This study was supported by grants from the Iceland Science Fund and the University of Iceland Research Fund. We thank Kristjan Thorarinsson for statistical advice and for critical reading and comments on the manuscript. We also thank R. T. Holmes and an anonymous reviewer for critical comments and considerable improvement of the manuscript.
M. & U. N. G. v. Blotzheim, 1966-1982. Handbuch der Vogel Mitteleuropas. Vol. 1-9. Akademische Verlagsgesellschaft, Frankfurt am Main. , 1972. Reproduction and fluctations in the size of duck populations at Lake Myvatn, Iceland. Oikos 23: 35-38. Bioconsult, 1984. Recipientundersogelse af Nive A-systemet. Copenhagen. Cain, B. , 1976. Energetics of growth of Black-bellied Tree Duck. Condor 78: 124-128. Clapham, W. B. , 1983. Natural ecosystems. , New York. Cowiconsult, 1983. Recipientundersogelser af Nive Asystemet og Nive A Bugt.