Nesting Colonies of Ross' Goose

Ryder, John P.

doi:10.2307/4083501

Cited by 26 publications

(32 citation statements)

References 9 publications

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“…From 1965 to 1967, Ryder (1969) found Ross' and Snow Goose colonies only on islands in shallow lakes, where ice melts earlier than on deeper lakes. Nesting on these islands presumably deters predation by Arctic foxes (Alopex lagopus) because this predator avoids swimming.…”

Section: Habitat Selectionmentioning

confidence: 99%

“…In addition to increasing abundance of colonies, total numbers of nesting Lesser Snow and Ross' Geese at large colonies have increased rapidly in the Sanctuary since 1965 (Ryder, 1969;Kerbes et al, 1983). Kerbes (1993) estimated that in 1988,467 OOO Ross' and Snow Geese nested at known colonies on the mainland south of Queen Maud Gulf; 91 % of them were counted at only 4 colonies -colony 3: 214 800; colony 10: 112 OOO; colony 9: 74 700; and colony 46: 23 400.…”

Section: Increase In Numbers Of White Geesementioning

confidence: 99%

“…Gavin (1947) first reported nesting by Ross' Geese there in 1940. Aerial reconnaissances in this area increased the number of known nesting colonies from 3 in 1949 (Hanson et al, 1956) to 37 by 1967 (Ryder, 1969). Photographic inventories in 1976 revealed that total numbers of Ross' and Snow Geese nesting at colonies described by Ryder (1969) had increased two-fold and five-fold respectively, with 5 new colonies discovered in 1976 (Kerbes et al, 1983).…”

Section: Introductionmentioning

confidence: 99%

“…Aerial reconnaissances in this area increased the number of known nesting colonies from 3 in 1949 (Hanson et al, 1956) to 37 by 1967 (Ryder, 1969). Photographic inventories in 1976 revealed that total numbers of Ross' and Snow Geese nesting at colonies described by Ryder (1969) had increased two-fold and five-fold respectively, with 5 new colonies discovered in 1976 (Kerbes et al, 1983). Later photographic inventories increased the number of known colonies of white geese (Ross' and/or white and blue phase Lesser Snow Geese) in the Sanctuary and adjacent areas to the southeast to 44 in 1982 and 66 in 1988 (Kerbes, 1993) (Fig.…”

Section: Introductionmentioning

confidence: 99%

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Previously Unrecorded Colonies of Ross' and Lesser Snow Geese in the Queen Maud Gulf Bird Sanctuary

Alisauskas¹,

Boyd²

1994

ARCTIC

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ABSTRACT. In late June 1990 and 1991, during helicopter surveys of geese on the lowlands south of Queen Maud Gulf in the central Canadian Arctic, we found 26 colonies of nesting Ross' (Chen rossii) and Lesser Snow Geese (Chen c. cuerulescens). In the 1960% colonies were found exclusively on islands in shallow lakes; in 1990-91, only 39% of previously unreported colonies were on such lakes. We suggest that, due to massive growth in local populations of both species, lack of unoccupied nesting sites on islands in small lakes has obliged Ross' and Lesser Snow Geese to select other nesting habitats. Snow and Ross' Geese appear to be expanding toward the Coast and westward within the Queen Maud Gulf Bird Sanctuary into areas currently favoured by White-fronted and Canada Geese. Key words: Snow Geese, Ross' Geese, goose colonies, Central Arctic, Queen Maud Gulf RÉSUMÉ. Lors de relevés effectués en hélicoptère à la fin juin 1990 et 1991, afin d'évaluer la population d'oies sur les terres basses du sud du golfe Reine-Maud situé au centre de l'Arctique canadien, on a dénombré 26 colonies d'oies de Ross (Chen rossii) et de petites oies blanches (Chen c. caerulescens). Dans les annees 1960, on ne trouvait des colonies que sur des îles de lacs peu profonds; en 1990-91, seulement 39 p. cent des colonies qui n'avaient pas été reportées précédemment se trouvaient Sur ces lacs. On suggkre qu'en raison de la très forte croissance de la population locale des deux espèces, la pénurie d'aires de nidification libres sur les îles des petits lacs a forcé l'oie de Ross et la petite oie blanche B choisir d'autres habitats de nidification. L'oie de Ross et la petite oie blanche semblent étendre leur territoire en direction de la côte et vers l'ouest à l'intérieur du refuge d'oiseaux du golfe Reine-Maud vers des régions qui représentent actuellement un habitat de prédilection pour l'oie B front blanc et la bernache du Canada.

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Section: Habitat Selectionmentioning

confidence: 99%

Section: Increase In Numbers Of White Geesementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Previously Unrecorded Colonies of Ross' and Lesser Snow Geese in the Queen Maud Gulf Bird Sanctuary

Alisauskas¹,

Boyd²

1994

ARCTIC

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“…Most of the known populations of Ross' geese nest in a 185-mile wide and 84-mile deep zone south of Queen Maud Gulf on the Canadian mainland (Ryder 1969) which is indicated in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

An Inferred Sex Differential in Copper Metabolism in Ross' Geese (<i>Anser rossii</i>): Biogeochemical and Physiological Considerations

Hanson¹,

Jones²

1974

ARCTIC

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ABSTRACT. The geology and the levels of various minerals in the nutrient chain of the ecosystems of the breeding grounds of most populations of wild geese are distinctive. Hence minerals that become incorporated in the keratin of the primary feathers grown on the breeding grounds can be used as biological tracers to determine origins of migrants. Hormones indirectly affect the levels of some minerals in the feather keratin. Estrogen is presumed to account for higher levels of copper found in the primary feathers of adult female, as compared with adult male, Ross' geese (Anser rossii).RÉSUMÉ. Sur une différence selon le sexe dans le métabolisme du cuivre chez l'oie de Ross (Anser rossii): considérations biogéochimiques et physiologiques. Dans la chaîne alimentaire des écosystèmes des terrains de reproduction de la plupart des peuplements d'oies sauvages, la géologie et les niveaux des divers minéraux sont distinctifs. Les minéraux incorporés dans la kératine des premières plumes qui poussent sur ces terrains peuvent donc servir de "traceurs" biologiques pour déterminer l'origine des migrants. Les hormones affectent indirectement les niveaux de certains minéraux dans la kératine des plumes. On suppose que l'estrogène explique les niveaux plus élevés de cuivre trouvés dans les premières plumes de la femelle adulte, en comparaison avec le mâle adulte, chez l'oie de Ross (Anser rossii).

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Reduction in biomass of freshwater arctic vegetation by foraging and nesting hyperabundant herbivores shows recovery

Kellett

Alisauskas

2022

Ecosphere

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Arctic‐nesting geese are specialist herbivores of grasses and sedges (collectively, graminoids). Under moderate grazing pressure, these migratory herbivores can create and maintain arctic grazing lawns with high nutritional content and low aboveground biomass. Nutrient and energy subsidies from southern agricultural landscapes during winter have improved survival among populations of Ross's (Anser rossii) and lesser snow geese (Anser caerulescens caerulescens), leading to marked population growth. Resulting goose hyperabundance has raised conservation concern for resilience of arctic ecosystems to withstand cumulative and intense pressures of herbivory and nest construction. We used both design‐based (experimental herbivore exclosures) and model‐based methods to investigate changes to plant community structure in direct response to foraging and nesting by these species within the Queen Maud Gulf (Ahiak) Migratory Bird Sanctuary, Nunavut, Canada. Annual nest construction and foraging by up to ~1.3 million geese at a large colony at Karrak Lake markedly reduced aboveground biomass of forage (graminoids) and non‐forage (foliose and fruticose lichens) vegetation, with spatial variation in reduction associated with intensity of use by geese. Within vast brood‐rearing regions, foraging reduced above‐ and belowground plant biomass of lowland plant communities by 61% and 29%, respectively, between 1994 (when herbivore exclosures were established) and 2017. In addition to landscape diversity associated with abiotic properties created by geomorphic processes, long‐term herbivory by geese further increased spatial heterogeneity in vegetation at the landscape scale. Although foraging geese nearly completely depleted aboveground plant biomass in some parts of their brood‐rearing areas, belowground biomass was largely conserved, and thus, plant communities had strong potential for aboveground regeneration. We propose that the effects of high‐density nesting and foraging by Ross's and lesser snow geese in the central Canadian Arctic, while extensive, are ephemeral and prone to reversion following cessation of grazing and nesting pressure, such as that afforded by shifts in herbivore distribution or local population decline.

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Nesting Colonies of Ross' Goose

Cited by 26 publications

References 9 publications

Previously Unrecorded Colonies of Ross' and Lesser Snow Geese in the Queen Maud Gulf Bird Sanctuary

Previously Unrecorded Colonies of Ross' and Lesser Snow Geese in the Queen Maud Gulf Bird Sanctuary

An Inferred Sex Differential in Copper Metabolism in Ross' Geese (<i>Anser rossii</i>): Biogeochemical and Physiological Considerations

Reduction in biomass of freshwater arctic vegetation by foraging and nesting hyperabundant herbivores shows recovery

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