Aquatic Birds in the Trophic Web of Lakes: Proceedings of a symposium held in Sackville, New Brunswick, Canada, in August 1991

Front Matter....Pages i-viii
Overwintering waterfowl on Swiss lakes: how are abundance and species richness influenced by trophic status and lake morphology?....Pages 1-14
Responses of breeding duck populations to changes in food supply....Pages 15-27
Birds in the trophic web of Lake Esrom, Denmark....Pages 29-38
The diet of Herring Gulls ( Larus argentatus ) during winter and early spring on the lower Great Lakes....Pages 39-55
Fish-eating bird abundance in oligotrophic lakes in Kejimkujik National Park, Nova Scotia, Canada....Pages 57-61
Abundance and feeding of wintering and migrating aquatic birds in two sampling areas of Lake Balaton in 1983–1985....Pages 63-69
Wading bird use of established and newly created reactor cooling reservoirs at the Savannah River Site, near Aiken, South Carolina, USA....Pages 71-82
Trophic web structure in a shallow eutrophic lake during a dominance shift from phytoplankton to submerged macrophytes....Pages 83-90
Cormorant ( Phalacrocorax carbo [L]) populations and patterns of abundance at breeding and feeding sites in Northern Ireland, with particular reference to Lough Neagh....Pages 91-100
Aquatic bird densities in two coastal lagoon systems in Chiapas State, Mexico, a preliminary assessment....Pages 101-106
Bird abundance and species richness on Florida lakes: influence of trophic status, lake morphology, and aquatic macrophytes....Pages 107-119
Nutrient additions by waterfowl to lakes and reservoirs: predicting their effects on productivity and water quality....Pages 121-132
The importance of avian-contributed nitrogen (N) and phosphorus (P) to Lake Grand-Lieu, France....Pages 133-147
Aquatic bird populations as possible indicators of seasonal nutrient flow at Ichkeul Lake, Tunisia....Pages 149-156
Feeding of ducks and their effects on water quality....Pages 157-161
Eutrophication and black swan ( Cygnus atratus Latham) populations: tests of two simple relationships....Pages 163-170
Use of boreal forested wetlands by Pacific loons ( Gavia pacifica Lawrence) and horned grebes ( Podiceps auritus L.): relations with limnological characteristics....Pages 171-183
Use of lakes by black duck broods in relation to biological, chemical, and physical features....Pages 185-199
Patterns of lake acidity and waterfowl communities....Pages 201-206
Duckling response to changes in the trophic web of acidified lakes....Pages 207-221
Biomechanics and foraging profitability: an approach to assessing trophic needs and impacts of diving ducks....Pages 223-233
Influence of macroinvertebrates and macrophytes on waterfowl utilization of wetlands in the Prairie Pothole Region of northwestern Wisconsin....Pages 235-246
Habitat distribution of the mallard in relation to vegetation structure, food, and population density....Pages 247-252
Food supply and the effects of recreational disturbance on the abundance and distribution of wintering Pochard on a gravel pit complex in southern Britain....Pages 253-261
Effects of weather and tides on feeding and flock positions of wintering redheads in the Chandeleur Sound, Louisiana....Pages 263-278
Use of saltwater and freshwater habitats by wintering redheads in southern Texas....Pages 279-287
Habitat selection and survival of Common Goldeneye ( Bucephala clangula ) broods — preliminary results....Pages 289-296
Breeding bird communities and environmental variable correlates of Scottish peatland wetlands....Pages 297-307
Waterfowl-wetland relationships in the Aspen Parkland of British Columbia: comparison of analytical methods....Pages 309-325
Assessment of Grey Heron predation on fish communities: the case of the largest European colony....Pages 327-344
Presence or absence of fish as a cue to macroinvertebrate abundance in boreal wetlands....Pages 345-351
Impact of Great Crested Grebes ( Podiceps cristatus L.) on fish ponds....Pages 353-366
Effects of Nile perch ( Lates niloticus ) introduction into Lake Victoria, East Africa, on the diet of Pied Kingfishers ( Ceryle rudis )....Pages 367-376
Possible competitive interactions between overwintering tufted duck ( Aythya fuligula (L.)) and fish populations of Lough Neagh, Northern Ireland: evidence from diet studies....Pages 377-386
Tufted Duck ( Aythya fuligula ) habitat use and brood survival increases after fish removal from gravel pit lakes....Pages 387-392
Loons in freshwater lakes....Pages 393-413
Activity budgets of a marked common loon ( Gavia immer ) nesting population....Pages 415-420
Habitat selection by loons in southcentral Alaska....Pages 421-430
Responses of breeding common loons to human activity in Upper Michigan....Pages 431-438
Susceptibility to freshwater acidification by two species of loon: Red-throated Loon ( Gavia stellata ) and Arctic Loon ( Gavia arctica ) in southwest Sweden....Pages 439-444
Potential risk to common loons ( Gavia immer ) from methylmercury exposure in acidified lakes....Pages 445-455
Responses to food web manipulation in a shallow waterfowl lake....Pages 457-466
Mute Swans in Great Britain: a review, current status and long-term trends....Pages 467-482
Nutrient additions to wetlands in the Interlake region of Manitoba, Canada: effects of periodic additions throughout the growing season....Pages 483-495
Nutrient additions to wetlands in the Interlake region of Manitoba, Canada: effects of a single pulse addition in spring....Pages 497-510
Changes in abundance of water birds species in southern Bohemia (Czech Republic) in the last 10 years....Pages 511-519
Sackville Waterfowl Park, Sackville, New Brunswick, Canada. Baseline characterization, towards long-term monitoring....Pages 521-524