scholarly journals Impact of a major forest blowdown event on breeding of Ancient Murrelets, Synthliboramphus antiquus, at a colony in Haida Gwaii, British Columbia

2015 ◽  
Vol 129 (3) ◽  
pp. 285
Author(s):  
Anthony J. Gaston ◽  
Jake Pattison ◽  
Ainsley Brown
Keyword(s):  
British Columbia ◽  
Breeding Success ◽  
Sharp Decrease ◽  
Haida Gwaii ◽  
Breeding Colony

In the winter of 2010–2011 a large storm blew down an area of about 18 ha of mature coastal rainforest on East Limestone Island, Haida Gwaii, British Columbia. The area supported part of a breeding colony of Ancient Murrelets (Synthliboramphus antiquus). Observations of the timing of chick departures from this section of the colony in 2012 and 2013 suggested that daily timing of chick departures were delayed, on average, by about 30 min, compared with earlier years. This delay may have been caused by debris from the blowdown impeding the progress of chicks over the ground. A sharp decrease in the number of chicks leaving the blowdown area in 2014 may signify that some breeding pairs left the area following reduced breeding success.

Antiproliferative, Immunostimulatory, and Anti-Inflammatory Activities of Extracts Derived from Mushrooms Collected in Haida Gwaii, British Columbia (Canada)

2019 ◽  
Vol 21 (7) ◽  
pp. 629-643 ◽  
Author(s):  
Gurbind S. Deo ◽  
Jatinder Khatra ◽  
Sukhpreet Buttar ◽  
Wai Ming Li ◽  
Linda E. Tackaberry ◽  
...  
Keyword(s):  
British Columbia ◽  
Haida Gwaii ◽  
Anti Inflammatory

U-PB DETRITAL ZIRCON ANALYSIS OF THE QUEEN CHARLOTTE GROUP, HAIDA GWAII, BRITISH COLUMBIA

2017 ◽  
Author(s):  
Cameron Dorsey ◽  
◽  
William A. Matthews ◽  
Bernard Guest ◽  
Stephen M. Hubbard
Keyword(s):  
British Columbia ◽  
Detrital Zircon ◽  
Haida Gwaii

Home range and landscape use by a marabou stork and the breeding success of Africa's most southerly breeding colony

2021 ◽  
Author(s):  
David A. Ehlers Smith ◽  
Brent Coverdale ◽  
Ben Hoffman ◽  
Christopher Kelly ◽  
Yvette C. Ehlers Smith ◽  
...  
Keyword(s):  
Home Range ◽  
Breeding Success ◽  
Breeding Colony ◽  
Landscape Use ◽  
Marabou Stork

Long-term data indicates that supplementary food enhances the number of breeding pairs in a Cape Vulture Gyps coprotheres colony

2016 ◽  
Vol 27 (1) ◽  
pp. 140-152 ◽  
Author(s):  
DANA G. SCHABO ◽  
SONJA HEUNER ◽  
MICHAEL V. NEETHLING ◽  
SASCHA RÖSNER ◽  
ROGER UYS ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Breeding Success ◽  
Food Sources ◽  
Breeding Colony ◽  
Supplementary Food ◽  
Adequate Food ◽  
Vulture Conservation ◽  
Positive Effect ◽  
Term Data

SummaryThe number of vultures is declining in many parts of the world due to numerous threats, such as poisoning and collisions with power-lines as well as the lack of adequate food sources. Vulture restaurants, i.e. supplementary feeding stations, have become a widespread conservation tool aimed at supporting vulture colonies. However, it is poorly understood how vulture restaurants influence population dynamics and whether they affect breeding success of vulture populations. We used a 12-year dataset from a breeding colony of the Cape Vulture Gyps coprotheres and a nearby vulture restaurant in South Africa to investigate the effect of supplementary food on population dynamics and breeding success. We found a significantly positive effect of supplementary food during the nest-building stage on the number of breeding pairs. However, breeding success, i.e. the proportion of successful nests, did not depend on supplementary food during the incubation and rearing stage. Especially during the critical rearing stage, the amount of food supplied might not have been sufficient to meet food demands of the colony. Still, our results indicate that carefully managed vulture restaurants might stabilise vulture colonies and can therefore aid vulture conservation.

Collector’s Note: Amethyst from Haida Gwaii, British Columbia, Canada

2021 ◽  
Vol 96 (5) ◽  
pp. 460-463
Author(s):  
Mark Mauthner ◽  
Jack Whittles
Keyword(s):  
British Columbia ◽  
Haida Gwaii

Loon abundance and behaviour over four decades at a remote ecological reserve on Haida Gwaii, British Columbia, Canada

2021 ◽  
Vol 135 (1) ◽  
pp. 28-38
Author(s):  
Thomas Reimchen ◽  
Sheila Douglas
Keyword(s):  
British Columbia ◽  
Gasterosteus Aculeatus ◽  
Evolutionary Ecology ◽  
Inverse Correlation ◽  
Gavia Immer ◽  
Haida Gwaii ◽  
Average Wind Speed ◽  
The North ◽  
Common Loons ◽  
Ecological Reserve

Early studies (1976–1982) of the Drizzle Lake Ecological Reserve on Haida Gwaii, British Columbia focussed on the endemic Giant Threespine Stickleback (Gasterosteus aculeatus) and their predators. These surveys showed daily visits to the small lake (110 ha) by up to 59 adult non-breeding Common Loon (Gavia immer), an important stickleback predator and up to 19 breeding and non-breeding adult Red-throated Loon (Gavia stellata), which leave daily to forage in nearby marine waters. We continued loon surveys for 17 additional years (1983–1989, 2011–2020) and found that aggregations of non-breeding Common Loons occurred annually on the lake during July with maximum daily numbers of 78–83 individuals in 1987, 2018, and 2020 and a large increase from 2011 to 2020. We did not detect any relationship of these differences with the Pacific Decadal Oscillation but a significant inverse correlation with average wind speed. Average yearly numbers of Red-throated Loons declined by 50% from 1976 to 1989 and have remained low, with lowest numbers (<2) occurring in 2017. Two Red-throated Loon nesting territories on the lake were occupied from 1976 to 1995, with chicks occurring in 24 of 36 nests, but no successful nesting was observed on the lake over the last decade. The relative decline of Red-throated Loon in this reserve is similar to that reported in Arctic and Subarctic surveys of the species in the north Pacific and northern Europe. We discuss the implications for the evolutionary ecology of the sticklebacks and the conservation of the ecological reserve.

scholarly journals Inferred predation of Fairy Tern eggs by Ruddy Turnstones at Rottnest Island, Western Australia, an internationally significant shorebird site

2021 ◽  
Vol 38 ◽  
pp. 115-117
Author(s):  
C.N. Greenwell ◽  
◽  
Keyword(s):  
Biodiversity Conservation ◽  
Western Australia ◽  
Breeding Success ◽  
Behavioural Response ◽  
Environment Protection ◽  
Egg Predation ◽  
Breeding Colony ◽  
Wide Range ◽  
Collective Group ◽  
The Tropics

Ruddy Turnstones Arenaria interpres have been identified as egg-predators at seabird and shorebird colonies, including gull and tern colonies in the tropics and Northern Hemisphere. The Australian Fairy Tern Sternula nereis nereis is a threatened (Environment Protection and Biodiversity Conservation Act 1999: Vulnerable) coastal seabird, whose breeding behaviour and ecology expose it to a wide range of threats. This study describes inferred predation on Fairy Tern eggs at a small breeding colony on Rottnest Island, Western Australia, by Ruddy Turnstones, a previously unsuspected predator for thisspecies. Unlike the behavioural response shown towards Silver Gulls Larus novaehollandiae and Australian Ravens Corvus coronoides, which includes collective group defence and dive-bombing, Fairy Terns showed a lack of aggression towards Turnstones within the colony. The lack of a behavioural response suggests that the Terns did not recognise the Turnstones as predators, which may increase the risk of egg-predation. This study suggests that we should be alert to threats from unsuspected predators, which have the potential to reduce the breeding success of this Vulnerable tern.

Late Pleistocene age, size, and paleoenvironment of a caribou antler from Haida Gwaii, British Columbia

2019 ◽  
Vol 56 (6) ◽  
pp. 688-692 ◽  
Author(s):  
Rolf W. Mathewes ◽  
Michael Richards ◽  
Thomas E. Reimchen
Keyword(s):  
British Columbia ◽  
Late Pleistocene ◽  
Vegetation Cover ◽  
Coniferous Forest ◽  
Bone Collagen ◽  
Haida Gwaii ◽  
Terrestrial Vertebrates ◽  
Mis 3 ◽  
Basal Portion ◽  
Marine Isotope Stage 3

The basal portion of a fossil caribou antler from Graham Island is the only evidence of large terrestrial vertebrates older than the Fraser (late-Wisconsin) glaciation on Haida Gwaii. This antler has been radiocarbon dated three times by different laboratories and all ages fall within the mid-Wisconsin Olympia Interglaciation (Marine Isotope Stage 3, MIS 3). We suggest that the latest date, using ultrafiltration of bone collagen, is closest to the true age at 43 200 ± 650 years BP (48 200 – 45 200 cal BP). Previous paleoecological analysis from Graham Island reconstructed a vegetation cover during MIS 3 consisting of mixed coniferous forest with nonforested openings, similar to cool subalpine forests of today. These conditions are consistent with environments that support woodland caribou and the related extinct Dawson caribou. Morphometric comparison of antlers from woodland and Dawson caribou suggest that they are more similar than previously interpreted and raise questions about the inferred differences between the mainland and island subspecies.

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