Decline in Body Mass, Size, and Condition of Greater Snow Geese, 1975-94

1997 ◽  
Vol 61 (2) ◽  
pp. 413 ◽  
Author(s):  
Austin Reed ◽  
Nathalie Plante
Keyword(s):  
Body Mass ◽  
Snow Geese ◽  
Mass Size

scholarly journals Survival of Young Greater Snow Geese (Chen Caerulescens Atlantica) During Fall Migration

The Auk ◽  
2005 ◽  
Vol 122 (2) ◽  
pp. 479-496 ◽  
Author(s):  
Stéphane Menu ◽  
Gilles Gauthier ◽  
Austin Reed
Keyword(s):  
Body Mass ◽  
High Arctic ◽  
Climatic Conditions ◽  
Factors Affecting ◽  
Chen Caerulescens ◽  
Migratory Flight ◽  
Snow Geese ◽  
Before And After ◽  
Chen Caerulescens Atlantica ◽  
Similar Survival

Abstract The many hazards that await birds along their migratory routes may negatively affect their survival, especially among newly fledged young. We estimated survival of young Greater Snow Geese (Chen caerulescens atlantica) during fall migration from the High Arctic to temperate areas and examined factors affecting their survival over a five-year period, using two approaches. First, each year (1993–1997), we banded fledglings and adults in mid-August, just before their departure from Bylot Island in the High Arctic (Nunavut, Canada), and again at an important staging area 3,000 km to the south at the Cap Tourmente National Wildlife Area (Québec, Canada) in October; recovery data from those two banding periods allowed estimation of survival during fall migration. Second, we visually determined brood size of neck-banded females before and after the main portion of the migratory flight, to estimate survival of young. The two approaches yielded similar survival estimates and showed the same interannual variation, thus suggesting that estimates were reliable. Mortality of young shortly after fledging and during the fall migration was high, compared with that of adults (monthly survival 0.662 in young vs. 0.989 in adults). However, mortality of young after migration was similar to that of adults (monthly survival 0.969 in young vs. 0.972 in adults). Migration survival of young varied considerably among annual cohorts (range of 0.119–0.707 over five years), and most of the mortality appeared to be natural. Survival was especially low in years when (1) temperatures at time of fledging and start of migration were low (i.e. near or below freezing), (2) mean body mass of goslings near fledging was low, or (3) mean fledging date was late. Our results suggest that migration survival of young is affected by a combination of several factors (climatic conditions, body mass, and fledging date) and that survival is reduced when one of those factors intervenes.

Influence du mode de vie sur les caractéristiques pondérales et structurales du squelette chez les amphibiens anoures

1995 ◽  
Vol 73 (2) ◽  
pp. 234-242 ◽  
Author(s):  
Jacques Castanet ◽  
Maria Helena Caetano
Keyword(s):  
Body Mass ◽  
Bone Structure ◽  
Selective Reduction ◽  
Relative Mass ◽  
Aquatic Life ◽  
Total Body Mass ◽  
Skeletal Mass ◽  
Mode Of Life ◽  
Mass Size ◽  
Total Body

To specify the influence of a permanent aquatic life on skeletal mass and bone structure in anuran amphibians, the general and regional masses of the skeleton, as well as several histomorphometric indices of the bones (porosity, corticodiaphyseal index, density) were compared in four ranid species, two predominantly aquatic (Rana perezi and R. esculenta) and two more terrestrial (R. temporaria and R. dalmatina). The relative mass of the skeleton (as a percentage of the total body mass) is significantly lower in aquatic forms. This difference is not a phenomenon of intra- or inter-specific allometry between skeletal mass and body mass (size effect). Rather, it reflects a selective reduction of skeletal volume (low corticodiaphyseal index values and higher porosity), in particular in the autopodia, pectoral girdle, front limbs, and vertebral column of aquatic forms. These results reinforce the idea that habitat and mode of life are selective factors producing a more or less developed skeleton in anurans. Whether a lighter skeleton is a permanent adaptative feature or a reversible response in predominantly aquatic anurans remains to be tested.

Non‐breeding Cackling, Ross's and Snow Geese on Baffin Island show no loss of body mass during wing moult

Ibis ◽  
2016 ◽  
Vol 158 (4) ◽  
pp. 876-880 ◽  
Author(s):  
Anthony D. Fox ◽  
James O. Leafloor ◽  
Thorsten J. S. Balsby ◽  
Kathryn M. Dickson ◽  
Michael A. Johnson ◽  
...  
Keyword(s):  
Body Mass ◽  
Baffin Island ◽  
Snow Geese ◽  
Wing Moult

scholarly journals Are Abdominal Profiles Useful to Assess Body Condition of Spring Staging Greater Snow Geese?

The Condor ◽  
2005 ◽  
Vol 107 (3) ◽  
pp. 694-702 ◽  
Author(s):  
Matthieu Féret ◽  
Joël Bêty ◽  
Gilles Gauthier ◽  
Jean-François Giroux ◽  
Gérald Picard
Keyword(s):  
Body Mass ◽  
Body Condition ◽  
Abdominal Fat ◽  
Chen Caerulescens ◽  
Individual Level ◽  
Snow Geese ◽  
Profile Score ◽  
Negative Effect ◽  
Chen Caerulescens Atlantica ◽  
The Individual

AbstractAbdominal profile indices were developed to evaluate body condition in birds without capturing or handling them. We assessed the reliability of abdominal profile indices in predicting condition of spring staging Greater Snow Geese (Chen caerulescens atlantica). We first calibrated profile scores assigned to females against two direct measures of nutrient stores, abdominal fat and body mass corrected for body size. Abdominal profile indices were linearly and significantly related to both abdominal fat and body mass but the variance was high for individuals assigned to the same profile score (R2 = 0.08 and R2 = 0.09, respectively, n = 230). On average, an increase of one profile score corresponded to an increase of 100 g in body mass. Abdominal profiles were better predictors of average abdominal fat and body mass of birds assigned to the same profile category. To assess the usefulness of abdominal profiles in the field, we also examined if the technique could detect the negative effect of a spring hunt on nutrient storage by staging geese, an effect previously detected with internal measures of nutrient reserves. We monitored seasonal changes in abdominal profile indices of staging geese in years without (1997 and 1998) and with the spring hunt (1999 and 2000). In two out of three regions, abdominal profiles revealed that condition increased at a higher rate in nonhunting than in hunting years. The lack of a negative effect of hunting in the other region was likely due to variability among observers in abdominal profile scoring. We conclude that abdominal profile indices can be useful to assess body condition of spring staging Greater Snow Geese although the technique has serious limitations at the individual level, especially without proper training of observers.¿Son los Perfiles Abdominales Útiles para Determinar la Condición Corporal de Chen caerulescens atlantica durante Escalas Migratorias de Primavera?Resumen. Los índices de perfil abdominal fueron desarrollados para evaluar la condición corporal de las aves sin tener que capturarlas o manipularlas. En este estudio examinamos la confiabilidad de dichos índices para predecir la condición corporal de gansos Chen caerulescens atlantica durante la época de escalas migratorias de primavera. Inicialmente, calibramos los puntajes de los perfiles asignados a un grupo de hembras con respecto a dos medidas directas de reservas nutritivas, la grasa abdominal y la masa corregida por el tamaño corporal. Los índices de perfil abdominal estuvieron lineal y significativamente relacionados con la grasa abdominal y la masa corporal (R2 = 0.08 y R2 = 0.09, respectivamente, n = 230), pero la varianza entre individuos asignados al mismo puntaje del perfil fue alta. En promedio, un incremento de un punto en el perfil correspondió a un incremento de 100 g en la masa corporal. Los perfiles abdominales predijeron de mejor manera los promedios de grasa abdominal y masa corporal de aves asignadas a la misma categoría del perfil. Para evaluar la utilidad de los perfiles abdominales en el campo, también examinamos si la técnica podía detectar el efecto negativo de la cacería de primavera sobre el almacenamiento de nutrientes en gansos que estaban haciendo escalas migratorias, un efecto previamente detectado por medio de medidas internas de las reservas nutritivas. Monitoreamos los cambios estacionales en los índices de perfil abdominal de gansos en años que estuvieron (1997 y 1998) y no estuvieron (1999 y 2000) expuestos a cacería en la primavera. En dos de las tres regiones, los perfiles abdominales indicaron que la condición corporal se incrementó a una tasa mayor en los años sin cacería. La ausencia de un efecto negativo de la cacería en la otra región probablemente fue debida a la variabilidad entre distintos observadores al establecer los valores del perfil abdominal. Concluimos que los índices de perfil abdominal pueden ser útiles para evaluar la condición corporal de estos gansos durante la época de escalas migratorias, pero la técnica tiene limitaciones serias a nivel individual, especialmente cuando los observadores no han sido entrenados adecuadamente.

Incubation Behavior and Body Mass of Female Greater Snow Geese

The Condor ◽  
1995 ◽  
Vol 97 (4) ◽  
pp. 993-1001 ◽  
Author(s):  
Austin Reed ◽  
R. John Hughes ◽  
Gilles Gauthier
Keyword(s):  
Body Mass ◽  
Incubation Behavior ◽  
Snow Geese

191: Does the Body Mass Index Affect the Outcome Following Reconstruction of Orthotopic Neobladder?

2007 ◽  
Vol 177 (4S) ◽  
pp. 64-64
Author(s):  
Murugesan Manoharan ◽  
Martha A. Reyes ◽  
Alan M. Nieder ◽  
Bruce R. Kava ◽  
MarkS Soloway
Keyword(s):  
Body Mass Index ◽  
Body Mass ◽  
The Body ◽  
Orthotopic Neobladder

981: Mass Size Predicts Probability of Renal Mass Malignancy

2005 ◽  
Vol 173 (4S) ◽  
pp. 265-266 ◽  
Author(s):  
James R. Johannes ◽  
Deborah Glassman ◽  
George Kallingal ◽  
Dolores Byrne ◽  
Stephen E. Strup ◽  
...  
Keyword(s):  
Renal Mass ◽  
Mass Size
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