Intercolony variation in growth of black brant goslings on the Yukon-Kuskokwim Delta, Alaska

2011 ◽  
Vol 75 (1) ◽  
pp. 101-108 ◽  
Author(s):  
Thomas F. Fondell ◽  
Paul L. Flint ◽  
James S. Sedinger ◽  
Christopher A. Nicolai ◽  
Jason L. Schamber
Keyword(s):  
Black Brant ◽  
Intercolony Variation

Development of Microsatellite Loci Exhibiting Reverse Ascertainment Bias and a Sexing Marker for use in Emperor Geese (Chen Canagica)

2017 ◽  
Vol 10 (4) ◽  
pp. 201-210 ◽  
Author(s):  
Meg C. Gravley ◽  
George K. Sage ◽  
Joel A. Schmutz ◽  
Sandra L. Talbot
Keyword(s):  
Microsatellite Loci ◽  
Statistical Power ◽  
Ascertainment Bias ◽  
Next Generation Sequencing Technology ◽  
Branta Bernicla ◽  
Black Brant ◽  
Expected Heterozygosity ◽  
Cackling Geese ◽  
The 1960S ◽  
Goose Species

The Alaskan population of Emperor Geese ( Chen canagica) nests on the Yukon–Kuskokwim Delta in western Alaska. Numbers of Emperor Geese in Alaska declined from the 1960s to the mid-1980s and since then, their numbers have slowly increased. Low statistical power of microsatellite loci developed in other waterfowl species and used in previous studies of Emperor Geese are unable to confidently assign individual identity. Microsatellite loci for Emperor Goose were therefore developed using shotgun amplification and next-generation sequencing technology. Forty-one microsatellite loci were screened and 14 were found to be polymorphic in Emperor Geese. Only six markers – a combination of four novel loci and two loci developed in other waterfowl species – are needed to identify an individual from among the Alaskan Emperor Goose population. Genetic markers for identifying sex in Emperor Geese were also developed. The 14 novel variable loci and 15 monomorphic loci were screened for polymorphism in four other Arctic-nesting goose species, Black Brant ( Branta bernicla nigricans), Greater White-fronted ( Anser albifrons), Canada ( B. canadensis) and Cackling ( B. hutchinsii) Goose. Emperor Goose exhibited the smallest average number of alleles (3.3) and the lowest expected heterozygosity (0.467). Greater White-fronted Geese exhibited the highest average number of alleles (4.7) and Cackling Geese the highest expected heterozygosity (0.599). Six of the monomorphic loci were variable and able to be characterised in the other goose species assayed, a predicted outcome of reverse ascertainment bias. These findings fail to support the hypothesis of ascertainment bias due to selection of microsatellite markers.

scholarly journals Growth of black brant and lesser snow goose goslings in northern alaska

2017 ◽  
Vol 81 (5) ◽  
pp. 846-857 ◽  
Author(s):  
Jerry W. Hupp ◽  
David H. Ward ◽  
Kyle R. Hogrefe ◽  
James S. Sedinger ◽  
Philip D. Martin ◽  
...  
Keyword(s):  
Snow Goose ◽  
Black Brant ◽  
Lesser Snow Goose ◽  
Northern Alaska

NATAL AND BREEDING PHILOPATRY IN A BLACK BRANT,BRANTA BERNICLA NIGRICANS,METAPOPULATION

Ecology ◽  
1998 ◽  
Vol 79 (6) ◽  
pp. 1893-1904 ◽  
Author(s):  
Mark S. Lindberg ◽  
James S. Sedinger ◽  
Dirk V. Derksen ◽  
Robert F. Rockwell
Keyword(s):  
Branta Bernicla ◽  
Black Brant ◽  
Branta Bernicla Nigricans

scholarly journals Long-term trends in fall age ratios of black brant

2017 ◽  
Vol 82 (2) ◽  
pp. 362-373 ◽  
Author(s):  
David H. Ward ◽  
Courtney L. Amundson ◽  
Robert A. Stehn ◽  
Christian P. Dau
Keyword(s):  
Black Brant ◽  
Long Term Trends

Species definition in heliolitine corals of the lower Douro Formation (Upper Silurian), Canadian Arctic

1989 ◽  
Vol 63 (6) ◽  
pp. 819-838 ◽  
Author(s):  
Owen A. Dixon
Keyword(s):  
Canadian Arctic ◽  
Morphological Plasticity ◽  
Distinct Species ◽  
Discrete Variation ◽  
Species Definition ◽  
Septal Development ◽  
Upper Silurian ◽  
Intercolony Variation ◽  
Lithistid Sponge ◽  
Sponge Reefs

Specimens representingHeliolites diligensBondarenko, 1966,H.aff.H. luxarboreusYang, 1978, andH. tchernysheviBondarenko, 1966, are common andHeliolitessp. andStelliporellasp. are rare in diverse coral assemblages associated with lithistid sponge reefs in deep shelf or ramp limestone facies of the Douro Formation.Heliolites diligens, a more widely adapted, possibly “opportunist” species, occurs abundantly in lower diversity stromatoporoid/coral assemblages from nonreefal, shallower shelf limestone facies. Detailed systematic study of approximately contemporaneous populations of these Ludlovian heliolitid species shows that all are morphologically variable; assessment of this variability qualitatively and quantitatively is critical to species definition and recognition.Heliolites diligensis the most variable, with wide intercolony variation in septal development, corallite wall configuration, and spacing of horizontal skeletal elements. This apparently represents morphological plasticity rather than differences that can be ascribed to distinct species. Conspecificity of the more extreme and dissimilar variants can be inferred from study of large assemblages of coeval specimens. The other species, with more narrowly defined, discrete variation fields, are more readily distinguished from each other.

Black Brant

2000 ◽  
pp. 221-232 ◽  
Author(s):  
James S. Sedinger ◽  
Alice A. Stickney
Keyword(s):  
Black Brant

scholarly journals Large-Scale Variation in Growth of Black Brant Goslings Related to Food Availability

The Auk ◽  
2001 ◽  
Vol 118 (4) ◽  
pp. 1088-1095 ◽  
Author(s):  
James S. Sedinger ◽  
Mark P. Herzog ◽  
Brian T. Person ◽  
Morgan T. Kirk ◽  
Tim Obritchkewitch ◽  
...  
Keyword(s):  
Large Scale ◽  
Grazing Pressure ◽  
The Arctic ◽  
First Year ◽  
Principal Mechanism ◽  
Density Dependent ◽  
Brood Rearing ◽  
Branta Bernicla ◽  
Black Brant ◽  
Arctic Coast

AbstractWe examined variation in growth of Black Brant (Branta bernicla nigricans) goslings among two colonies on the Yukon-Kuskokwim Delta in southwestern Alaska and the Colville River Delta on Alaska's Arctic coast. We simultaneously measured abundance and quality of a key food plant, Carex subspathacea, and grazing pressure on that plant at the three colonies. Our goal was to measure variation in gosling growth in relation to variation in grazing pressure and food abundance because growth of goslings is directly linked to first-year survival, and consequently is the principal mechanism for density-dependent population regulation. Goslings grew substantially faster on the arctic coast and were nearly 30% larger than those on the Yukon-Kuskokwim Delta at four to five weeks old. Faster growth on the arctic coast was associated with 2× greater standing crop of C. subspathacea during brood rearing than on the Yukon-Kuskokwim Delta. Dispersal rates are high enough (Lindberg et al. 1998) to rule out local adaptation and genetic variation as explanations for observed variation in growth. Our results are consistent with lower survival of goslings from the Yukon-Kuskokwim Delta during their first fall migration and stronger density-dependent regulation on the Yukon-Kuskokwim Delta than on the Arctic coast.

Effect of reflected molecules on rotational temperature measurements with rocketborne electron beam fluorescence probes

1977 ◽  
Vol 55 (4) ◽  
pp. 370-377 ◽  
Author(s):  
A. A. Haasz
Keyword(s):  
Electron Beam ◽  
Flow Regime ◽  
Rotational Temperature ◽  
Temperature Measurements ◽  
Fluorescence Probes ◽  
Molecular Flow ◽  
Free Molecular Flow ◽  
Temperature Calibration ◽  
Black Brant ◽  
Theoretical Predictions

Theoretical predictions were obtained for the effect of reflected nitrogen molecules on rotational temperature measurements with rocketborne electron beam fluorescence probes in the free molecular flow regime. Calculations for a typical payload (Black Brant AEF-II-118 flown from Fort Churchill, Man., Canada) indicate that the effect of reflected molecules can be significant and should be considered in the derivation of the theoretical temperature calibration curves.

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