Articles
Roost-site characteristics of Common Poorwills, Phalaenoptilus nuttallii, in Saskatchewan — Kaili Wang and R. Mark Brigham	543
Numbers and seasonal occurrence of Humpback Whales, Megaptera novaeangliae, off Brier Island, Nova Scotia — D. Paquet, C. Haycock, and H. Whitehead	548
Vegetation succession and disturbance on a boreal forest floodplain, Susitna River, Alaska — D. J. Helm and William B. Collins	553
Moose, Alces alces, habitat relative to riparian succession in the boreal forest, Susitna River, Alaska — William B. Collins and D. J. Helm	567
Detection and distribution of the Apple Leaf Midge, Dasineura mali, in Nova Scotia — Brian R. Eaton and Erika Bent	575
Songbird nest placement in Vermont Christmas tree plantations — Jeffrey W. Hughes and Franklyn K. Hudson	580
Reproductive success of the Common Loon, Gavia immer, on a small oligotrophic lake in eastern Canada — Douglas Clay and Heather Clay	586
The effect of egg coloration on predation of artificial ground nests — Benoît Jobin and Jaroslav Picman	591
Effects of hunting and loss of escape cover on movements and activity of female White-tailed Deer, Odocoileus virginianus — David E. Naugle, Jonathan A. Jenks, Brian J. Kernohan, and Rex R. Johnson	595
A new surgical technique for implanting radio transmitters in Beavers, Castor canadensis — Michelle Wheatley	601
The condition and trend of aspen, Populus tremuloides, in Kootenay and Yoho National Parks: Implications for ecological integrity — Charles E. Kay	607
An investigation of the invasive shrub European Buckthorn, Rhamnus cathartica L., near Saskatoon, Saskatchewan — O. W. Archibold, D. Brooks, and L. Delanoy	617
Status of the White-top Aster, Aster curtus (Asteraceae) in Canada — George W. Douglas and Jeanne M. Illingworth	622
Notes
A probable case of polyterritorial polygyny in the Red-eyed Vireo, Vireo olivaceus — D. James Mountjoy	628
The northernmost extension of the moss Pleurozium schreberi (Brid.) Mitt. in the Canadian High Arctic — Marian Kuc	630
Trichophyton mentagrophytes ringworm infection in a Northern Pocket Gopher, Thomomys talpoides — Gilbert Proulx and Detlef K. Onderka	633
Abundance and diversity of ant (Hymenoptera: Formicidae) assemblages in regenerating forests of northern Saskatchewan — Monica G. Kidd and Robert W. Longair	635
Northern record of the Water Shrew, Sorex palustris, in Alaska — Joseph A. Cook, Chris J. Conroy, and James D. Herriges, Jr.	638
A Preliminary evaluation of four types of traps to capture Northern Pocket Gophers, Thomomys talpoides — Gilbert Proulx	640
Estimating fall whole-body weights of Muskrats, Ondatra zibethicus, from skinned weights — Gilbert Proulx	643
Coyote, Canis latrans, depredation of a Mute Swan, Cygnus olor, nest — Shelley M. Spohr, Howard J. Kilpatrick, and Gregory G. Chasko	646
Hybridization of Thinhorn and Bighorn sheep, Ovis dalli x O. canadensis — Manfred Hoefs and Uli Nowlan	647
Ptilidium californicum a new liverwort for Alberta — D. Ross Priddle	648
A case of helping behavior at a Brewer's Sparrow, Spizella breweri, nest — M.J. Gill and P. G. Krannitz	650
Non-melanic shizochroism in Alberta Evening Grosbeaks, Coccothraustes vespertinus — Jocelyn Hudon	652
An example of endurance in an old Wolf, Canis lupus — L. David Mech	654
Predation attempt on incubating Common Loons, Gavia immer, and the significance of shoreline nesting — Lucy S. Vlietstra and James A. Paruk	656
A simple technique to capture breeding adults and broods of Surf Scoters, Melanitta perspicillata — Louis Lesage, Jean-Pierre L. Savard, Austin Reed	657
Range extension of the Rainbow Smelt, Osmerus mordax, in the Hudson Bay waters of Manitoba — Richard A. Remnant, Paul G. Graveline and Ronald L. Bretecher	660
Distributional records for the Threespine Stickleback, Gasterosteus aculeatus, Linnaeus (Pisces: Gasterosteidae), in Manitoba — W.B. McKillop and W.M. McKillop	662
Hyssop-leaved Loosestrife, Lythrum hyssopifolia L. (Lythraceae), new to Canada — C. Sean Blaney, Michael J. Oldham, and Anton A. Reznicek	664
News and Comment
Notices: Canadian Species at Risk April 1997 — The Boreal Dip Net — The Ontario Chorus — Program and Abstracts: 1st Annual Meeting of the Working Group on Amphibian and Reptile Conservation in Canada and 6th Annual Meeting of the IUCN/SSC Task Force on Declining Amphibian Populations in Canada (DAPCAN) — Froglog: Newsletter of the Declining Amphibian Populations Task Force — Rana-Saura: Amphibian population monitoring program; Atlas of amphibians and reptiles of Quebec — Canadian Association of Herpetologists Bulletin — Global Biodiversity: Canadian Museum of Nature — Amphipacifica: Journal of Systematic Biology — Swift Fox Symposium: 18-19 February 1998 — Sea Wind: Bulletin of Ocean Voice International — Canadian Botanical Association Lawson Award to William J. Cody — Recovery: An Endangered Species Newsletter —	666
A tribute to Harold Archie Senn, 1912-1997 — William J. Cody	671
Book Reviews
Zoology: Field Guide to the Birds of the Middle East — The Historical Atlas of Breeding Birds in Britain and Ireland: 1875-1900 — Messages from an Owl — The Wood Duck and the Mandarin: The Northern Wood Ducks — Ontario Birds: A Field Guide to 125 Common Birds of Ontario — Landscape Approaches in Mammalian Ecology and Conservation — Ruddy Ducks and Other Stifftails: Their Behavior and Biology — The Amphibians and Reptiles of the Yucatán Peninsula — The Garter Snakes: Evolution and Ecology — Foundations of Animal Behavior: Classic Papers with Commentaries — Peterson Flash Guides: Backyard Birds, Atlantic Coastal Birds, Pacific Coastal Birds, Hawks, Eastern Trailside Birds, Western Trailside Birds — Amphibians of Oregon, Washington, and British Columbia: A Field Identification Guide — Snakes in Question: The Smithsonian Answer Book — Opossums, Shrews, and Moles of British Columbia — Amphibian Biology, Volume 1: The Integument — Amphibian Biology, Volume 2: Social Behaviour — Handbook of the Birds of the World, Volume 3: Hoatzin to Auks — Birds of Kenya and Northern Tanzania — The Wind Masters: The Lives of North American Birds of Prey — Shrikes (Laniidae) of the World: Biology and Conservation — A Birder's Guide to Trinidad and Tobago — Female Control: Sexual Selection by Cryptic Female Choice — Red Fox: The Catlike Canine — A Birder's Guide to Florida — Atlas of Distribution of Fish within the Canadian Tributaries of Western Lake Superior — Pleistocene Amphibians and Reptiles in North America	676
Botany: Forest Plants of Central Ontario — Plants of the Western Boreal Forest and Aspen Parkland — Mountain Plants of the Pacific Northwest: A Field Guide to Washington, Western British Columbia and Southeastern Alaska — The Book of Swamp and Bog: Trees, Shrubs, and Wildflowers of Eastern Freshwater Wetlands	697
Environment: Population Dynamics in Ecological Space and Time — In Search of Nature — Ecological Morphology — Conservation of Great Plains Ecosystems: Current Science, Future Options — Restoring Nature's Place: A Guide to Naturalizing Ontario Parks and Greenspace — Ecological Identity: Becoming a Reflective Environmentalist — Ontario's Old Growth: A Learner's Handbook — An Ancient Forest Atlas of the Lake Temagami Site Region (4E) — Down Canyon: A Naturalist Explores the Colorado River through the Grand Canyon — Expanding Partnerships in Conservation — The Song of the Dodo: Island Biogeography in an Age of Extinctions — Species Diversity in Ecological Communities: Historical and Geographic Perspectives — Forest Dreams, Forest Nightmares: The Paradox of Old Growth in the Inland West — Invasions of the Land: The Transitions of Organisms from Aquatic to Terrestrial Life	699
Miscellaneous: The Ice-age History of Alaskan National Parks — The Shape of Life: Genes, Development, and the Evolution of Animal Form — Full House: The Spread of Excellence from Plato to Darwin — American Museum of Natural History: 125 Years of Expedition and Discovery — Evolution Extended: Biological Debates on the Meaning of Life	708
New Titles	713
Index Compiled by Leslie Durocher	716
	744
Mailing date: 12 November 1997

ISSN: 0008-3550