Aquatic Birds in the Trophic Web of Lakes

1. Bird response to nutrient levels and acidification

   1. Duckling response to changes in the trophic web of acidified lakes

      • Jean-Luc DesGranges, Christian Gagnon

      Pages 207-221

2. Food choices and habitat selection

   1. Biomechanics and foraging profitability: an approach to assessing trophic needs and impacts of diving ducks

      • James R. Lovvorn

      Pages 223-233

   2. Influence of macroinvertebrates and macrophytes on waterfowl utilization of wetlands in the Prairie Pothole Region of northwestern Wisconsin

      • Richard A. Lillie, James O. Evrard

      Pages 235-246

   3. Habitat distribution of the mallard in relation to vegetation structure, food, and population density

      • P. Nummi, H. Pöysä, J. Elmberg, K. Sjöberg

      Pages 247-252

   4. Food supply and the effects of recreational disturbance on the abundance and distribution of wintering Pochard on a gravel pit complex in southern Britain

      • A. D. Fox, T. A. Jones, R. Singleton, A. D. Q. Agnew

      Pages 253-261

   5. Effects of weather and tides on feeding and flock positions of wintering redheads in the Chandeleur Sound, Louisiana

      • Thomas C. Michot, E. Barry Moser, Wayne Norling

      Pages 263-278

   6. Use of saltwater and freshwater habitats by wintering redheads in southern Texas

      • Marc C. Woodin

      Pages 279-287

   7. Habitat selection and survival of Common Goldeneye (Bucephala clangula) broods — preliminary results

      • Hannu Pöysä, Juha Virtanen

      Pages 289-296

   8. Breeding bird communities and environmental variable correlates of Scottish peatland wetlands

      • A. D. Fox, M. C. Bell

      Pages 297-307

   9. Waterfowl-wetland relationships in the Aspen Parkland of British Columbia: comparison of analytical methods

      • Jean-Pierre L. Savard, W. Sean Boyd, G. E. John Smith

      Pages 309-325

3. Bird-fish interactions

   1. Assessment of Grey Heron predation on fish communities: the case of the largest European colony

      • Eric Feunteun, Loïc Marion

      Pages 327-344

   2. Presence or absence of fish as a cue to macroinvertebrate abundance in boreal wetlands

      • Mark L. Mallory, Peter J. Blancher, Patrick J. Weatherhead, Donald K. McNicol

      Pages 345-351

   3. Impact of Great Crested Grebes (Podiceps cristatus L.) on fish ponds

      • Paula Ulenaers, Janine van Vessem

      Pages 353-366

   4. Effects of Nile perch (Lates niloticus) introduction into Lake Victoria, East Africa, on the diet of Pied Kingfishers (Ceryle rudis)

      • Jan H. Wanink, Kees P. C. Goudswaard

      Pages 367-376

   5. Possible competitive interactions between overwintering tufted duck (Aythya fuligula (L.)) and fish populations of Lough Neagh, Northern Ireland: evidence from diet studies

      • Denise K. Winfield, Ian J. Winfield

      Pages 377-386

   6. Tufted Duck (Aythya fuligula) habitat use and brood survival increases after fish removal from gravel pit lakes

      • N. Giles

      Pages 387-392

4. The status of loons

   1. Loons in freshwater lakes

      • Judith W. McIntyre

      Pages 393-413

   2. Activity budgets of a marked common loon (Gavia immer) nesting population

      • David C. Evers

      Pages 415-420

   3. Habitat selection by loons in southcentral Alaska

      • Anne K. Ruggles

      Pages 421-430

   4. Responses of breeding common loons to human activity in Upper Michigan

      • James A. Caron Jr., William L. Robinson

      Pages 431-438

Birds are an integral part of most freshwater ecosystems (lakes, rivers, wetlands) but their role in the trophic dynamics of these water bodies has often been overlooked. As a conspicuous part of the biota of water bodies, aquatic birds are indicators of their trophic state both in terms of species composition (quality) as well as occupancy and breeding (quantity). Birds may also influence the trophic state of a water body by importing nutrients (.e.g. resident or migrating birds feeding on adjacent watersheds or the sea). Because of anthropogenic activities, predation or their mobility, birds may not utilize otherwise suitable aquatic habitat. These factors complicate the relationship between aquatic bird production and the trophic status of habitats. As a consequence, the role of aquatic birds in freshwater ecosystems has usually been ignored.
This volume contains a wide range of papers selected from those presented at the symposium and reviewed.

• bird
• ecosystem
• fish
• lake
• trophic dynamics
• wetland

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