Activity Patterns of Marbled Murrelets in Old-Growth Forest in the Queen Charlotte Islands, British Columbia

The Condor ◽  
1993 ◽  
Vol 95 (4) ◽  
pp. 831-848 ◽  
Author(s):  
Michael S. Rodway ◽  
Heidi M. Regehr ◽  
Jean-Pierre L. Savard
Keyword(s):  
British Columbia ◽  
Activity Patterns ◽  
Old Growth ◽  
Queen Charlotte Islands ◽  
Old Growth Forest ◽  
Marbled Murrelets

Activity levels of Marbled Murrelets in different inland habitats in the Queen Charlotte Islands, British Columbia

1993 ◽  
Vol 71 (5) ◽  
pp. 977-984 ◽  
Author(s):  
Michael S. Rodway ◽  
Heidi M. Regehr ◽  
Jean-Pierre L. Savard
Keyword(s):  
British Columbia ◽  
High Elevation ◽  
Activity Levels ◽  
Old Growth ◽  
Marbled Murrelet ◽  
Queen Charlotte Islands ◽  
Old Growth Forest ◽  
Second Growth ◽  
Old Growth Forests ◽  
Marbled Murrelets

We compared Marbled Murrelet (Brachyramphus marmoratus) activity levels in May, June, and July 1990 in four habitats in the Queen Charlotte Islands, British Columbia: alpine, old-growth forest at high elevation, old-growth forest at low elevation, and second-growth forest. The number of Marbled Murrelet detections was highest in old-growth forests. In alpine areas, small numbers of murrelet detections were mostly of distant birds flying over low-elevation forest. Numbers of detections were higher in low-elevation than in high-elevation old-growth forests in May and July, but not in June. Proportions of detections within smaller radii of survey stations were higher in low elevation forest in all months. The highest activity levels were associated with old-growth forest stands of large Sitka spruce (Picea sitchensis) and western hemlock (Tsuga heterophylla). The few detections that occurred in second-growth forests were mostly of distant birds. Stations in second-growth forest close to stands of old-growth forest had more frequent detections than stations with no old-growth forest nearby. Our results support the association of Marbled Murrelets with old-growth forests. Limitations of the survey methodology are discussed.

At-Sea Activity Patterns of Marbled Murrelets Adjacent to Probable Inland Nesting Areas in the Queen Charlotte Islands, British Columbia

1995 ◽  
Vol 76 (1) ◽  
pp. 82 ◽  
Author(s):  
Michael S. Rodway ◽  
Jean-Pierre L. Savard ◽  
Donald C. Garnier ◽  
Moira J. F. Lemon
Keyword(s):  
British Columbia ◽  
Activity Patterns ◽  
Queen Charlotte Islands ◽  
Marbled Murrelets

Cultivation of Hericium abietis on conifer sawdust

1997 ◽  
Vol 75 (7) ◽  
pp. 1155-1157 ◽  
Author(s):  
Guoping Xiao ◽  
Bill Chapman
Keyword(s):  
British Columbia ◽  
Key Words ◽  
Mushroom Cultivation ◽  
Old Growth ◽  
Old Growth Forest

Hericium abietis was isolated from a sporocarp collected near Quesnel Lake in the central interior of British Columbia and successfully cultivated indoors on conifer sawdust. Key words: Hericium abietis, mushroom cultivation, old growth forest.

Contrasting terrestrial lichen, liverwort, and moss diversity between old-growth and young second-growth forest on two soil textures in central British Columbia

2006 ◽  
Vol 84 (1) ◽  
pp. 120-132 ◽  
Author(s):  
Rachel S. Botting ◽  
Arthur L. Fredeen
Keyword(s):  
British Columbia ◽  
Forest Age ◽  
Old Growth ◽  
Moss Species ◽  
Old Growth Forest ◽  
Dominant Soil ◽  
Lichen Cover ◽  
Second Growth ◽  
Terrestrial Lichen ◽  
Woody Substrates

The diversity and abundance of terrestrial lichens, mosses, and liverworts were examined and compared between two ages of forest (old-growth and young second-growth) on two dominant soil types (fine- and coarse-textured soils) in subboreal spruce forests in central British Columbia. Major differences in species composition were found between forest ages, with 30% of species found only in old-growth forest and 21% found only in young second-growth forest. Liverworts were much more common in old-growth sites with half the liverwort species found exclusively in old-growth, and 90% of the recorded liverwort observations occurring there. Different moss species assemblages dominated old-growth and second-growth sites, with much of the terrestrial cover of second-growth sites composed of Polytrichum juniperinum Hedw. Young second-growth forest had higher cover of lichen species than old-growth forest. Lichens and bryophytes used different terrestrial substrates in each forest age, with higher cover of mosses and lichens occurring on woody substrates in old-growth, irrespective of substrate availability. Nonmetric multidimensional scaling ordination clearly separated plots by forest age and also showed soil texture to be a defining variable. Though not statistically significant, there was increased bryophyte diversity on coarse-textured soils and increased lichen cover on fine-textured soils.

Feeding ecology of the ancient and marbled murrelets near Langara Island, British Columbia

1975 ◽  
Vol 53 (4) ◽  
pp. 418-433 ◽  
Author(s):  
Spencer G. Sealy
Keyword(s):  
British Columbia ◽  
Feeding Ecology ◽  
Prey Availability ◽  
Breeding Cycle ◽  
Marbled Murrelet ◽  
Ammodytes Hexapterus ◽  
Queen Charlotte Islands ◽  
Early Portion ◽  
Marbled Murrelets

Two field seasons (1970 and 1971) were spent studying the feeding ecology of the ancient murrelet (Synthliboramphus antiquus) and the marbled murrelet (Brachyramphus marmoratus) near Langara Island, Queen Charlotte Islands, British Columbia. The relatively offshore-feeding ancient murrelet nests in colonies, lays two-egg clutches, and has truly precocial young. The inshore-feeding marbled murrelet is apparently a solitary nester, has one-egg clutches, and semiprecocial young. The ancient murrelet feeds predominantly on two species of euphausiid crustaceans, Euphausia pacifica and Thysanöessa spinifera, during the early portion of the terrestrial phase of its breeding cycle (early April to late May), but takes a fish, Ammodytes hexapterus, toward the end of the cycle. It is believed that this change in diet as the season progresses reflects a change in prey availability. The apparent patchy distribution of the prey of the ancient murrelet, which requires more time to locate the food source, has probably promoted the evolution of the 72-h incubation shifts found in this species.During the terrestrial phase of the marbled murrelet's breeding cycle (early May to late August), the fish Ammodytes hexapterus and Cymatogaster aggregata are predominantly taken. During the very early part of its breeding season, Thysanöessa spinifera constitutes a considerable part of its diet.

STUDIES IN FOREST PATHOLOGY: VIII. DECAY OF WESTERN HEMLOCK ON THE QUEEN CHARLOTTE ISLANDS, BRITISH COLUMBIA

1951 ◽  
Vol 29 (5) ◽  
pp. 479-521 ◽  
Author(s):  
R. E. Foster ◽  
A. T. Foster
Keyword(s):  
British Columbia ◽  
Tsuga Heterophylla ◽  
Total Loss ◽  
Western Hemlock ◽  
Site Quality ◽  
Forest Pathology ◽  
Old Growth ◽  
Queen Charlotte Islands ◽  
Dead Trees ◽  
Understory Trees

An investigation of western hemlock (Tsuga heterophylla (Raf.) Sarg.) on the Queen Charlotte Islands, British Columbia, has shown that decay losses in old-growth stands are appreciable, amounting to 13.9, 8.0, and 10.7% of the gross volume of Grades 1, 2, and 3 logs respectively. Total loss, including dead trees, amounted to 25.5% of the gross volume. Twenty-seven decay-producing fungi have been isolated. The most important of these are Fomes pinicola (Sw.) Cke., F. pini (Thore) Lloyd, F. annosus (Fr.) Cke., and Polyporus sulphureus Bull. ex Fr. Echinodontium tinctorium E. & E. apparently does not occur in the region. Scars provided the most frequent, and roots the most important, avenue of entrance for decay. The logs of 2318 western hemlock were analyzed in detail. Decay was found to increase progressively with diameter, age, and decreasing site quality. Maximum net periodic increment was reached between 350 and 400 years of age and between 35 and 40 in. in diameter. Color of bark was found to provide an added indication of tree maturity. Understory trees were found to give a substantial yield of sound wood.

scholarly journals Second-growth and small forest clearings have little effect on the temporal activity patterns of Amazonian phyllostomid bats

2019 ◽  
Vol 66 (2) ◽  
pp. 145-153 ◽  
Author(s):  
Ricardo Rocha ◽  
Adrià López-Baucells ◽  
Fábio Z Farneda ◽  
Diogo F Ferreira ◽  
Inês Silva ◽  
...  
Keyword(s):  
Activity Patterns ◽  
Behavioral Responses ◽  
Species Level ◽  
Secondary Forests ◽  
Old Growth ◽  
Old Growth Forest ◽  
Second Growth ◽  
Tropical Landscapes ◽  
Small Forest ◽  
Temporal Overlap

Abstract Secondary forests and human-made forest gaps are conspicuous features of tropical landscapes. Yet, behavioral responses to these aspects of anthropogenically modified forests remain poorly investigated. Here, we analyze the effects of small human-made clearings and secondary forests on tropical bats by examining the guild- and species-level activity patterns of phyllostomids sampled in the Central Amazon, Brazil. Specifically, we contrast the temporal activity patterns and degree of temporal overlap of 6 frugivorous and 4 gleaning animalivorous species in old-growth forest and second-growth forest and of 4 frugivores in old-growth forest and forest clearings. The activity patterns of frugivores and gleaning animalivores did not change between old-growth forest and second-growth, nor did the activity patterns of frugivores between old-growth forest and clearings. However, at the species level, we detected significant differences for Artibeus obscurus (old-growth forest vs. second-growth) and A. concolor (old-growth forest vs. clearings). The degree of temporal overlap was greater than random in all sampled habitats. However, for frugivorous species, the degree of temporal overlap was similar between old-growth forest and second-growth; whereas for gleaning animalivores, it was lower in second-growth than in old-growth forest. On the contrary, forest clearings were characterized by increased temporal overlap between frugivores. Changes in activity patterns and temporal overlap may result from differential foraging opportunities and dissimilar predation risks. Yet, our analyses suggest that activity patterns of bats in second-growth and small forest clearings, 2 of the most prominent habitats in humanized tropical landscapes, varies little from the activity patterns in old-growth forest.

Sign in / Sign up

Export Citation Format

Share Document