Is selenium affecting body condition and reproduction in boreal breeding scaup, scoters, and ring-necked ducks?

DeVink, Jean-Michel; Clark, Robert G.; Slattery, Stuart M.; Wayland, Mark

doi:10.1016/j.envpol.2007.05.003

Cited by 28 publications

(25 citation statements)

References 40 publications

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“…Concerns about elevated selenium on reproductive success have focussed on females, because of possible impacts on reproduction and deposition of selenium in eggs. However, Devink et al (2008) showed normal levels of selenium in eggs and follicles of female scaup collected in the boreal forest. Mercury concentrations in all cases were below threshold for major toxic effects in birds (15 lg/g dry weight) (Zillioux et al 1993).…”

Section: Contaminants and Trace Elementsmentioning

confidence: 94%

“…In one study, cadmium was negatively correlated with body condition (i.e., lipid reserves) whereas selenium showed a positive association to body condition (Anteau et al 2007). Others (DeVink et al 2008;Takekawa et al 2002) have found no relationship between selenium and body condition in scaup. However, DeVink et al (2008) did see a positive relationship between selenium and lipid reserves in white -winged scoters (Melanita fusca).…”

Section: Corticosteronementioning

confidence: 96%

“…Others (DeVink et al 2008;Takekawa et al 2002) have found no relationship between selenium and body condition in scaup. However, DeVink et al (2008) did see a positive relationship between selenium and lipid reserves in white -winged scoters (Melanita fusca). Takekawa et al (2002) noted total ash-free protein in canvasbacks (Aythya valisineria) decreased with increasing selenium concentrations while pancreas mass decreased with increasing mercury.…”

Section: Corticosteronementioning

confidence: 96%

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Corticosterone in relation to tissue cadmium, mercury and selenium concentrations and social status of male lesser scaup (Aythya affinis)

Pollock

Machin

2008

Ecotoxicology

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Combined lesser scaup (Aythya affinis) and greater scaup (A. marila) populations have declined steadily from the 1970s. Accompanying the population decline have been two shifts in lesser scaup demographics: a decrease in the proportion of young birds and an increase in male to female ratio. In addition, there are concerns about potential effects of contaminants and trace elements. These metals may influence the stress response and corticosterone secretion. We examined impacts of cadmium, selenium and mercury on the stress response in relation to social status in male lesser scaup near Yellowknife, NWT May to June 2004 and 2005. Kidney cadmium and liver selenium and mercury ranged 0.78-93.6, 2.12-9.64, and 0.56-3.71 microg/g, dry weight, respectively. Results suggest that corticosterone release may be influenced by complex contaminant interactions in relation to body condition and body size. When cadmium was high and birds were in good body condition, there was a negative relationship between liver selenium and corticosterone (R(2) = 0.60, n = 10, P = 0.008) but not in birds with poor body condition (R(2) = 0.07, n = 9, P = 0.50). Unfortunately we were unable to draw any conclusions about metals and social status in relation to corticosterone or glucose and T(4). This study emphasizes the complex nature of biological systems and the importance of considering interactions to characterize effects of metals.

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Section: Contaminants and Trace Elementsmentioning

confidence: 94%

Section: Corticosteronementioning

confidence: 96%

Section: Corticosteronementioning

confidence: 96%

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Corticosterone in relation to tissue cadmium, mercury and selenium concentrations and social status of male lesser scaup (Aythya affinis)

Pollock

Machin

2008

Ecotoxicology

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“…Gonad awafy^w.-Stable-isotope analysis of follicles from females collected in 2004 required the use of entire follicles, so we used lipid and protein content of follicles from scoters collected in 2003 (but used for a separate contaminants study; DeVink et al 2008) to estimate the relationship between follicle mass and reproductive nutrients in follicles of 2004 birds. Females were collected from the same location between 8 and 12 June 2003, and they had an identical range of follicle development (up to three postovulatory follicles).…”

Section: Methodsmentioning

confidence: 99%

Combining Stable-Isotope and Body-Composition Analyses to Assess Nutrient-Allocation Strategies in Breeding White-Winged Scoters (Melanitta fusca)

DeVink

Slattery

Clark

et al. 2011

The Auk

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Birds meet the energy and nutrient demands of egg formation by using dietary (exogenous) sources, somatic (endogenous) nutrients, or combinations of both. Therefore, understanding plasticity in resource acquisition and the allocation strategies that are used is important for predicting how ecosystem changes across a species' range could affect vital rates. Sources of egg nutrients have traditionally been assessed through analyses of body composition, but stable-isotope analysis has provided a new tool in cases where animal tissues differ isotopically from the local food webs where they breed. We provide the first simultaneous comparison of these two techniques and test the "seasonally variable nutrient threshold hypothesis." Using body-composition analysis of Whitewinged Scoters {Melanitta fusca) collected at the northern extent of their range, we inferred that protein in rapidly developing ovarian follicles was derived entirely from dietary sources but that follicle lipids were most likely derived largely from somatic reserves. Stableisotope analysis confirmed that most protein was derived from dietary sources during early (70.7-86.6%) and late (83.4-94.4%) spring collection periods, but dietary lipids were not distinguishable isotopically from stored somatic lipids to estimate lipid contributions to eggs. This pattern dififered from that at the southern limit of the species' breeding range, where both lipid and protein for egg formation were derived from exogenous sources. Although our results were consistent with plasticity in resource-allocation strategies among sites (latitudinal variation), they did not support the seasonally variable nutrient threshold hypothesis within a site. We discuss the benefits of using both techniques simultaneously to assess reproductive strategies of birds that migrate between isotopically distinct areas. Une combinaison de l'analyse des isotopes stables et de celle de la composition corporelle pour évaluer les stratégies d'allocation des nutriments chez des individus reproducteurs de Melanitta fuscaRÉSUMÉ.-Les oiseaux comblent leurs besoins en énergie et en nutriments pour la formation des oeufs en utilisant des sources alimentaires (exogènes), des nutriments somatiques (endogènes) ou une combinaison des deux. Ainsi, comprendre la plasticité de l'acquisition des ressources et les stratégies d'allocation utilisées s'avère essentiel pour prédire la façon dont les changements écosystémiques à travers l'aire de répartition d'une espèce peuvent influer sur les paramètres démographiques. Les sources de nutriments pour les oeufs ont traditionnellement été évaluées par des analyses de la composition corporelle. L'analyse des isotopes stables constitue un nouvel outil pour les cas où les tissus des animaux diffèrent, sur le plan des isotopes, des chaînes alimentaires locales où ils se reproduisent. Nous fournissons la première comparaison simultanée de ces deux techniques et testons l'hypothèse d'un seuil des nutriments variable au cours de la saison. À l'aide d'une analyse de la composi...

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“…Contaminants that birds accumulate on the wintering grounds, however, may no longer be present by the time individuals arrive on the breeding grounds (Warren and Cutting 2011). Further, some studies have shown that contaminants encountered during migration do not affect reproduction (DeVink et al 2008, Badzinski et al 2009). Although Wayland et al (2008a) detected no effect of heavy metal burdens on apparent survival in either Whitewinged Scoter (Melanitta fusca) or King Eider (Somateria spectabilis) females captured during nesting, their data did suggest a moderate, annually variable effect of blood mercury levels on capture probability, suggesting that breeding probability may have been negatively influenced.…”

Section: Introductionmentioning

confidence: 99%

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Is selenium affecting body condition and reproduction in boreal breeding scaup, scoters, and ring-necked ducks?

Cited by 28 publications

References 40 publications

Corticosterone in relation to tissue cadmium, mercury and selenium concentrations and social status of male lesser scaup (Aythya affinis)

Corticosterone in relation to tissue cadmium, mercury and selenium concentrations and social status of male lesser scaup (Aythya affinis)

Combining Stable-Isotope and Body-Composition Analyses to Assess Nutrient-Allocation Strategies in Breeding White-Winged Scoters (Melanitta fusca)

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