Showing papers in "Canadian Field-Naturalist in 2002"

New records of vascular plant in the Yukon Territory IV

Abstract: Forty-seven taxa, 35 native and 12 introduced, are reported as new to the flora of Yukon and nine taxa previously reported are deleted. The new native taxa are: Artemisia arctica ssp. comata , Botrychium alaskense , Botrychium minganense , Bromus richardsonii , Calamagrostis holmii , Carex incurviformis , Carex mackenziei , Carex microchaeta ssp. nesophila , Carex ramenskii , Carex rariflora var. androgyna , Carex tahoensis , Carex xerantica , Carex × flavicans , Deschampsia sukatschewii , Eleocharis erythropoda , Eleocharis macrostachya , Eleocharis mamillata , Erigeron ochroleucus , Impatiens noli-tangere , Limnorchis huronensis , Nymphaea tetragona , Polygonum douglasii ssp. douglasii , Potamogeton natans , Potentilla crebridens ssp. hemicryophila , Puccinellia tenella ssp. langeana , Rumex beringensis , Salix farriae , Salix glauca ssp. Stipuli fera , Saussurea nuda , Saxifraga hyperborea , Saxifraga rivularis ssp. arctolitoralis , Silene soczavana var. macrosperma , Symphyotrichum subspicatum , Taraxacum hyparcticum , and Zannichellia palustris . The new introduced taxa are: Acer negundo , Avena fatua , Camelina microcarpa , Crepis capillaris , Hippophae rhamnoides , Lamium amplexicaule , Linaria dalmatica , Medicago lupulina , Prunus padus , Rumex pseudonatronatus , Valeriana officinale , and Viola tricolor . Deleted taxa are: Aster laevis var. geyeri , Carex athrostachya , Elatine triantha , Camelina sativa , Erysimum cheiri , Galium palustre , Impatiens capensis , Platanthera hyperborea , and Sonchus oleraceus . Vouchers are cited and general notes on distribution and identification are provided. Four of the native taxa reported here are new to Canada: Botrychium alaskense , Carex microchaeta ssp. nesophila , Potentilla crebridens ssp. hemicryophila and Rumex beringensis .

Long-distance Movements by Female White-footed Mice, Peromyscus leucopus, in Extensive Mixed-wood Forest

Abstract: Two adult female White-footed Mice (Peromyscus leucopus) were recovered 14,730 m and 6840 m from where they were originally captured and tagged in central Massachusetts. Similar combinations of factors throughout an extensive forested landscape, including poor acorn (Quercus spp.) crops, high population densities of mice, and the exclusive social behaviour of other female mice, may have been responsible for these long distance movements.

Population trends of nesting Glaucous-winged Gulls, Larus glaucescens, in the southern Strait of Georgia, British Columbia

Abstract: Between 1986 and 1999, the number of nesting Glaucous-winged Gulls (Larus glaucescens) at fourteen breeding colonies declined by 31% (1610 nests) in the southern Strait of Georgia, British Columbia. Declines in the number of nesting pairs at surveyed colonies ranged between 6% and 81% with the smallest change occurring on the largest breeding colony in the study area. We suggest that Glaucous-winged Gull breeding population declines in the southern Strait of Georgia may be due to increased frequency of colony disturbance, in particular increased disturbance by Bald Eagles (Haliaeetus leucocephalus).