Clief and Deciduous Tree Nests of Marbled Murrelets in Southwestern British Columbia Author(s):
نویسندگان
چکیده
We report on nests of radio-marked marbled murrelets (Brachyramphus marmoratus) nesting in unusual habitats in southwestern British Columbia. We found 1 confirmed and 2 probable marbled murrelet nest sites on cliffs. These represent the 1st substantiated accounts of ground nesting in this species south of Alaska. In addition, we found a marbled murrelet nesting in a 130 (?5)-yr-old red alder (Alnus rubra) deciduous tree. A survey of available nesting sites in both the nest tree patch and the mixed coniferous-deciduous stand adjacent to this deciduous nest tree indicated most potential nesting trees were deciduous and that deciduous trees had a higher density of potential nesting sites. These unusual sites represent a very small proportion (7% of confirmed sites, 3% of suspected sites) of nest sites found in British Columbia using radio telemetry. Both confirmed nest sites consisted of a platform with heavy epiphyte cover and an adjacent flyway, similar to nests found in mature coniferous forest.
منابع مشابه
Morphometric Variation in Marbled Murrelets, Brachyramphus Marmoratus, in British Columbia
Morphometrics (culmen length, bill height, bill width, wing chord length, and tarsus length) were taken on 664 marbled murrelets at Desolation Sound and Mussel Inlet, British Columbia, during 1994 to 1997, in order to assess morphological differences within and between populations and the accuracy of a discriminant function analysis to identify the sex of birds. An assessment of interand intra-...
متن کاملBody mass variation in Marbled Murrelets in British Columbia, Canada
Body mass was measured in Marbled Murrelets Brachyramphus marmoratus from May to August, 1994–1998 at Desolation Sound, and during June and July 1997 at Mussel Inlet, British Columbia, Canada, to assess seasonal, sexual, site and intra-annual variation. Birds were captured by mist-net, and by night-lighting, and were sexed using molecular techniques. The breeding status of females (gravid or no...
متن کاملTemporal dynamics of edge effects on nest predation risk for the marbled murrelet
Habitat fragmentation can cause population declines greater than those expected from habitat loss alone. This can result from detrimental ‘‘edge effects’’, which occur when predation rates are higher at habitat edges relative to interiors. The marbled murrelet (Brachyramphus marmoratus) is a threatened seabird which nests in old-growth forests, a habitat that is being fragmented by ongoing harv...
متن کاملExxon Valdez Oil Spill Trustee Council Restoration Exxon Valdez Oil Spill Trustee Council Marbled Murrelet Brachyramphus Marmoratus Marmoratus
M arbled murrelets, Brachyramphus marmoratus marmoratus, are small seabirds of the Alcid Family. Alcids are diving seabirds inhabiting the north Pacific and include murres, puffins, auklets, murrelets, and guillemots. Marbled murrelets occur in nearshore marine environments from California to Alaska, nesting primarily in old-growth forests. A larger subspecies, B. m. perdix, is found along the ...
متن کاملEstimating 30-year change in coastal old-growth habitat for a forest-nesting seabird in British Columbia, Canada
The marbled murrelet Brachyramphus marmoratus is an old-growth dependent species that nests in North American coastal forests. Canadian populations and occurrence data are limited; however concern over loss of nesting habitat in coastal British Columbia led to an assessment of ‘threatened’ by the Committee on the Status of Endangered Wildlife in Canada, and subsequent listing under the Canadian...
متن کامل