Hematology, Biochemistry and Serum Protein Analyses of Antarctic and non-Antarctic Skuas

Ibáñez, Andrés; Najle, Roberto; Larsen, Karen; Montalti, Diego

doi:10.1675/063.038.0204

Cited by 11 publications

(6 citation statements)

References 29 publications

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“…Together, these results would indicate that adult Skuas experience a decline in serum albumin due to the increasing catabolic activity as a consequence of the energetic stress induced during egg incubation, nest maintenance, and foraging activities, and is positively correlated with the increasing corticosterone concentration during the different stages of breeding (Online Resource 1). Albumin in adult Skuas was lower than reference values previously reported (approximately 1.44 g/dl) (Iban ˜ez et al 2015). During In stage, albumin in females and males was found below this value, which would indicate that adults were in a suboptimal nutritional condition at the beginning of the breeding cycle, inducing a premature onset of a phase III of fasting (Hollme ´n et al 2001).…”

Section: Resultscontrasting

confidence: 67%

“…Plasma proteins (Er: 2.890 ± 0.242 g/dl, Lr: 2.465 ± 0.110 g/dl, n = 4), γ-globulins (Er: 0.1450 ± 0.085 g/dl, Lr: 0.0875 ± 0.017 g/dl, n = 4) and phosphorus (Er: 6.810 ± 0.370 mg/dl, Lr: 4.710 ± 0.098 mg/dl, n = 4, Paired t test, t3 = 6.458, p = 0.0075) (Online Resource 1, Fig. 3) levels dropped compared with reference values previously reported (Iban ˜ez et al 2015). Despite of the decline of the nutritional and health status in adults, because the reproductive effort, the suboptimal level in hematological parameters of chicks demonstrates that development was deteriorated,which may have direct consequences on the reproductive success of this specie.…”

Section: Resultssupporting

confidence: 46%

“…Serum protein fractions of Brown Skuas and their reference abundance were previously described. Proteins were scattered in five peaks corresponding to albumin, α 1 , α 2 , β-, and γ-globulin (Iban ˜ez et al 2015). In this work, adults showed higher values of α 1 -and α 2 globulins than those reported, which may be due to inflammatory processes at the onset of the breeding cycle.…”

Section: Resultsmentioning

confidence: 39%

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Declining health status of Brown Skua (Stercorarius antarcticus lonnbergi) parents and their offspring during chick development

Ibáñez

Grilli

Figueroa³

et al. 2017

Polar Biol

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During breeding, Brown Skuas (Stercorarius antarcticus lonnbergi) perform a great physical effort in the care and maintenance of the nest. Interestingly, the breeding colony on which this work was conducted is in steady decline in recent years. In order to understand the physiological background responsible for the trade off between reproductive effort and health status, in adults and the possible reasons for the colony decline, we evaluated the health status in Brown Skuas parents and growing chicks and blood samples were obtained in three different breeding stages from adults: In (incubation), Er (after egg hatching), and Lr (during chick rearing) and from developing chicks. Serum albumin, α-, β-. and γ-globulin fractions, IgY level and corticosterone were determined in adults, while plasma proteins concentration, electrolytes, and γ-globulins were determined in chicks. Differences in albumin, α-, and γ-globulins and IgY levels were observed in adults through the reproductive stages, indicating a decline in nutritional status and immunocompetence during breeding. In addition, a decline in body condition and immune status was observed in growing chicks, indicating a close relationship between the decrease of the health status and reproductive effort performed by adults and the physiological status of the nestlings during development.

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Section: Resultscontrasting

confidence: 67%

Section: Resultssupporting

confidence: 46%

Section: Resultsmentioning

confidence: 39%

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Declining health status of Brown Skua (Stercorarius antarcticus lonnbergi) parents and their offspring during chick development

Ibáñez

Grilli

Figueroa³

et al. 2017

Polar Biol

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“…In general, plasma metabolites reflect various aspects of physiological condition and characterize the feeding state of birds. Total protein and triglyceride levels reliably indicate nutrient status of wild and captive birds ( Jenni-Eiermann & Jenni, 1998 ; Jenni-Eiermann, Jenni & Piersma, 2002 ; Albano et al, 2016 ), although triglyceride levels may also vary in relation to environmental conditions and stress ( Artacho et al, 2007 ; Ibañez et al, 2015 ). Glucose level in plasma decreases during periods of fast and, thus, may serve as an indicator of short-term changes in food intake ( Jenni-Eiermann & Jenni, 1998 ; Totzke et al, 1999 ; Alonso-Alvarez et al, 2002 ).…”

Section: Introductionmentioning

confidence: 99%

When moult overlaps migration: moult-related changes in plasma biochemistry of migrating common snipe

Podlaszczuk

Włodarczyk

Janiszewski

et al. 2017

PeerJ

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Moult of feathers entails considerable physiological and energetic costs to an avian organism. Even under favourable feeding conditions, endogenous body stores and energy reserves of moulting birds are usually severely depleted. Thus, most species of birds separate moult from other energy-demanding activities, such as migration or reproduction. Common snipe Gallinago gallinago is an exception, as during the first autumn migration many young snipe initiate the post-juvenile moult, which includes replacement of body feathers, lesser and median wing coverts, tertials, and rectrices. Here, we evaluated moult-related changes in blood plasma biochemistry of the common snipe during a period of serious trade-off in energy allocation between moult and migration. For this purpose, concentrations of basic metabolites in plasma were evaluated in more than 500 young snipe migrating through Central Europe. We found significant changes in the plasma concentrations of total protein, triglyceride and glucose over the course of moult, while the concentrations of uric acid and albumin did not change. Total protein concentration increased significantly in the initial stage of moult, probably as a result of increased production of keratin, but it decreased to the pre-moult level at the advanced stage of moult. Plasma triglyceride concentration decreased during the period of tertial and rectrice moult, which reflected depletion of endogenous fat reserves. By contrast, glucose concentration increased steadily during the course of moult, which could be caused by increased catabolism of triglycerides (via gluconeogenesis) or, alternatively, due to increased glucocorticoids as a stress response. Our results suggest that physiological changes associated with moult may be considered important determinants of the low pace of migration typical of the common snipe.

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“…In general, plasma metabolites reflect various aspects of physiological condition and characterize the feeding state of birds. Total protein and triglyceride levels reliably indicate nutrient status of wild and captive birds (Jenni-Eiermann & Jenni, 1998;Jenni-Eiermann, Jenni & Piersma, 2002;Albano et al, 2016), although triglyceride levels may also vary in relation to environmental conditions and stress (Artacho et al, 2007;Ibañez et al, 2015). Glucose level in plasma decreases during periods of fast and, thus, may serve as an indicator of short-term changes in food intake (Jenni-Eiermann & Jenni, 1998;Totzke et al, 1999;Alonso-Alvarez et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Peer Review #1 of "When moult overlaps migration: moult-related changes in plasma biochemistry of migrating common snipe (v0.1)"

2017

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Moult of feathers entails considerable physiological and energetic costs to an avian organism. Even under favourable feeding conditions, endogenous body stores and energy reserves of moulting birds are usually severely depleted. Thus, most species of birds separate moult from other energy-demanding activities, such as migration or reproduction. Common snipe Gallinago gallinago is an exception, as during the first autumn migration many young snipe initiate the post-juvenile moult, which includes replacement of body feathers, lesser and median wing coverts, tertials and rectrices. Here, we evaluated moultrelated changes in blood plasma biochemistry of the common snipe during a period of serious trade-off in energy allocation between moult and migration. For this purpose, concentrations of basic metabolites in plasma were evaluated in more than 500 young snipe migrating through Central Europe. We found significant changes in the plasma concentrations of total protein, triglyceride and glucose over the course of moult, while the concentrations of uric acid and albumin did not change. Total protein concentration increased significantly in the initial stage of moult, probably as a result of increased production of keratin, but it decreased to the pre-moult level at the advanced stage of moult. Plasma triglyceride concentration decreased during the period of tertial and rectrice moult, which reflected depletion of endogenous fat reserves. By contrast, glucose concentration increased steadily during the course of moult, which could be caused by increased catabolism of triglycerides (via gluconeogenesis) or, alternatively, due to increased glucocorticoids as a stress response. Our results suggest that physiological changes associated with moult may be considered important determinants of the low pace of migration typical of the common snipe.

show abstract

Hematology, Biochemistry and Serum Protein Analyses of Antarctic and non-Antarctic Skuas

Cited by 11 publications

References 29 publications

Declining health status of Brown Skua (Stercorarius antarcticus lonnbergi) parents and their offspring during chick development

Declining health status of Brown Skua (Stercorarius antarcticus lonnbergi) parents and their offspring during chick development

When moult overlaps migration: moult-related changes in plasma biochemistry of migrating common snipe

Peer Review #1 of "When moult overlaps migration: moult-related changes in plasma biochemistry of migrating common snipe (v0.1)"

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