Intercolony differences in the summer diet of Thick-billed Murres in the eastern Canadian Arctic

1993 ◽  
Vol 71 (9) ◽  
pp. 1831-1840 ◽  
Author(s):  
Anthony J. Gaston ◽  
Michael S. W. Bradstreet
Keyword(s):  
Relative Abundance ◽  
Canadian Arctic ◽  
High Arctic ◽  
Baffin Bay ◽  
Number Of Species ◽  
Davis Strait ◽  
Similarity Indices ◽  
Low Arctic ◽  
Eastern Canadian Arctic

The diet of Thick-billed Murres collected near six colonies in the eastern Canadian Arctic comprised invertebrates (84% of 23 462 items) and fish (16%). Adult diets differed significantly among colonies, both within the Low Arctic (Hudson Strait), between Low and High Arctic (Lancaster Sound – Baffin Bay), and between Low-Arctic colonies and a colony close to the High/Low Arctic boundary (Davis Strait). Murres from the High Arctic took more invertebrates, fewer fish, and a smaller number of species overall than those from the Low Arctic. Diets were more diverse in the Low Arctic than in the High Arctic, in keeping with the greater number of prey taxa available at lower latitudes. Similarity indices show that diets at High-Arctic colonies were more similar to one another than was true for other colonies. Differences among Low-Arctic colonies suggest variation in the relative abundance of different nekton components within Hudson Strait.

The Calving Events of Petermann Glacier From 2008 to 2012: Ice Island Drift Characteristics, Assessment of Fracture Events, and Geographical Data Analysis

2019 ◽  
Author(s):  
Reza Zeinali Torbati ◽  
Ian D. Turnbull ◽  
Rocky S. Taylor ◽  
Derek Mueller
Keyword(s):  
Time Series ◽  
Data Analysis ◽  
Newfoundland And Labrador ◽  
Oil And Gas ◽  
Canadian Arctic ◽  
Baffin Bay ◽  
Arctic Shipping ◽  
Oil And Gas Operations ◽  
Break Up ◽  
Eastern Canadian Arctic

Abstract The eastern Canadian Arctic is an ice-prone environment that is a vital part of Canadian Arctic shipping lanes. A better understanding of the ice environment and ice characteristics in this region is essential for supporting safe and economical marine activities. This study presents a first analysis of the drift of ice islands that originated from the Petermann Glacier calving events in northwest Greenland between 2008 and 2012. These massive calving events generated numerous smaller ice islands and icebergs through subsequent deterioration and break-up events. Surviving ice features drifted further southward into the Baffin Bay and reached as far as offshore Newfoundland (∼47 °N) for the case of the 2010 calving event. The drift characteristics of Petermann ice islands are evaluated through the analysis of the recently developed Canadian Ice Island Drift, Deterioration and Detection (CI2D3) database. The average drift distance, speed, and directions of the ice islands that resulted from the 2008, 2010, and 2012 calving events were estimated using successive observations of the monitored ice islands in the CI2D3 database. This study also includes an assessment of fracture events, including the total number of ice island break-up events following each massive calving event and the average number of daughter ice islands resulting from each break-up event. A geographical analysis of the data was also performed to present the location of the fracture events, as well as the time series of latitude change of Petermann ice islands from their origin (northwest Greenland ice tongues) to where until they became too small (< 0.25 km2) to be delineated in the CI2D3 database. This information is of particular interest to marine activities in the eastern Canadian Arctic, and oil and gas operations offshore Newfoundland and Labrador.

Some Soil-Inhabiting, Freshwater, and Plant-Parasitic Nematodes from the Canadian Arctic and Alaska

ARCTIC ◽  
1963 ◽  
Vol 16 (3) ◽  
pp. 202 ◽  
Author(s):  
Roland H. Mulvey
Keyword(s):  
Canadian Arctic ◽  
High Arctic ◽  
Ellesmere Island ◽  
Parasitic Nematodes ◽  
Plant Parasitic Nematodes ◽  
Number Of Species ◽  
Plant Parasitic

Lists nematode genera (and the number of species in each) collected on the Canadian Arctic Expedition in 1915-1916, and at Lake Hazen, Ellesmere Island, in 1962. The former collection, identified by N.A. Cobb, but not hitherto reported (cf. No. 2817 pt. F), comprises 22 genera containing 47 species, about half of which are cosmopolitan. The Lake Hazen collection is the first the the High Arctic; it contains at least 30 described and several undescribed genera, comprising 60 or more species. Gen. Plectus is abundant in both collections.

Trends and Fluctuations in Bird Populations on the Tundra at Cambridge Bay, Nunavut

2012 ◽  
Vol 126 (2) ◽  
pp. 111
Author(s):  
C. Martin Lok ◽  
Jaap A. J. Vink
Keyword(s):  
Relative Abundance ◽  
High Arctic ◽  
Branta Bernicla ◽  
Bird Populations ◽  
Black Brant ◽  
Bay Area ◽  
Branta Bernicla Nigricans ◽  
Low Arctic ◽  
The 1960S ◽  
Victoria Island

Bird observations from the Cambridge Bay area on Victoria Island, Nunavut, in the summer of 2011 are presented and compared with those from the 1960s and 1980s. A total of 38 species was observed, compared with 42 in 1983 and 47 in 1986. Abundance of species of the High Arctic, such as Black Brant, Branta bernicla nigricans, Black-bellied Plover, Pluvialis squatarola, and Baird’s Sandpiper, Calidris bairdii, decreased, whereas numbers of the Red-necked Phalarope, Phalaropus lobatus, usually associated with the Low Arctic, increased markedly. Overall, the number of each species observed is rather stable and, for several species, the relative abundance does not seem to have changed significantly.

scholarly journals Size metrics, longevity, and growth rates in Umbellula encrinus (Cnidaria: Pennatulacea) from the eastern Canadian Arctic.

2018 ◽  
Vol 4 (4) ◽  
pp. 722-749 ◽  
Author(s):  
Bárbara de Moura Neves ◽  
Evan Edinger ◽  
Vonda Wareham Hayes ◽  
Brynn Devine ◽  
Laura Wheeland ◽  
...  
Keyword(s):  
Deep Water ◽  
Growth Rates ◽  
Trace Element Analysis ◽  
Canadian Arctic ◽  
Fishing Gear ◽  
Surface Salinity ◽  
Growth Rings ◽  
Element Analysis ◽  
Baffin Bay ◽  
Eastern Canadian Arctic

Umbellula encrinus (Linnaeus, 1758) is a deep-water sea pen commonly found in the eastern Canadian Arctic. It can reach heights of >2 m, and it has often been caught as fishing bycatch. Here, we characterized abundance/density, size metrics, longevity, and growth rates of U. encrinus colonies from Baffin Bay (between Greenland and Canada). No prevalent size classes were identified at most locations, except for Jones Sound and Cape Dyer, where small-size colonies dominated. Average number of growth rings in the internal skeleton (axis) of the examined colonies ranged between 2 and 68, with a maximum of 75. A bomb-14C analysis yielded 14C curves comparable with those of other deep-water octocorals with annual ring formation. A trace element analysis of Mg/Ca, Sr/Ca, Ba/Ca, and Na/Ca yielded values oscillating along the axis radius, with the number of peaks and growth rings being comparable. Growth rates averaged 0.067 ± 0.015 mm year−1 (radial extension) and 4.5 ± 1.2 cm year−1 (linear extension), considering rings to be formed annually. Relationships between radial growth rates, depth, and surface salinity were weak but statistically significant. Umbellula encrinus is a long-lived species, vulnerable to various types of fishing gear, with a skeleton that stores biological and environmental information.

scholarly journals Sea ice thickness in the Eastern Canadian Arctic: Hudson Bay Complex & Baffin Bay

2017 ◽  
Vol 200 ◽  
pp. 281-294 ◽  
Author(s):  
Jack C. Landy ◽  
Jens K. Ehn ◽  
David G. Babb ◽  
Nathalie Thériault ◽  
David G. Barber
Keyword(s):  
Sea Ice ◽  
Canadian Arctic ◽  
Ice Thickness ◽  
Hudson Bay ◽  
Sea Ice Thickness ◽  
Baffin Bay ◽  
Eastern Canadian Arctic

Spatial, temporal, and source variations of hydrocarbons in marine sediments from Baffin Bay, Eastern Canadian Arctic

2015 ◽  
Vol 506-507 ◽  
pp. 430-443 ◽  
Author(s):  
Karen L. Foster ◽  
Gary A. Stern ◽  
Jesse Carrie ◽  
Joscelyn N.-L. Bailey ◽  
Peter M. Outridge ◽  
...  
Keyword(s):  
Marine Sediments ◽  
Canadian Arctic ◽  
Baffin Bay ◽  
Eastern Canadian Arctic
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