Age-related variations in plasma levels of alkaline phosphatase, calcium and inorganic phosphorus in chicks of two species of raptors

̃uela, Javier Vin; Ferrer, Miguel; Recio, F.

doi:10.1016/0300-9629(91)90233-3

Cited by 58 publications

(44 citation statements)

References 24 publications

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“…Thus, the increasing concentrations we observed in Osprey nestlings are expected during the growth stage, with maximum values occurring at the end of structural development before fledging. However, we did not find a parallel increase in the enzyme ALP, which is associated with the elongation and ossification of skeletal structures (Viñuela et al 1991;Tilgar et al 2008). A similar absence of covariation in ALP with age has also been observed in other species (Costa et al 1993;Dobado-Berrios and Ferrer 1997;Niezgoda et al 1984).…”

Section: Effect Of Sex and Agesupporting

confidence: 69%

“…It is possible that the peak of ALP had already been attained, resulting in a plateau within the sampled age range, whereas the increase in calcium was slightly delayed to complete bone ossification. In this context, Viñuela et al (1991) found that calcium levels reached their maximum after ALP in Red Kites (Milvus milvus) and Black Kites (M. migrans).…”

Section: Effect Of Sex and Agementioning

confidence: 94%

“…Calcium concentrations in plasma have been related to chondrogenesis, osteoblastic activity, and bone mineralization during the growth period in birds (Viñuela et al 1991;Tilgar et al 2004). Thus, the increasing concentrations we observed in Osprey nestlings are expected during the growth stage, with maximum values occurring at the end of structural development before fledging.…”

Section: Effect Of Sex and Agementioning

confidence: 99%

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Factors affecting plasma biochemistry parameters and physical condition of Osprey (Pandion haliaetus) nestlings

Muriel

Schmidt²,

Calabuig

et al. 2013

J Ornithol

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We assessed the normal values for 15 blood plasma biochemistry parameters and three indices of body condition (IBCs) in free-living Osprey (Pandion haliaetus) nestlings in Brandenburg (Germany). Values were compared with those of other raptors, and possible sexual and age-related differences were examined. In addition, we looked for possible relationships of habitat quality (measured in terms of foraging conditions and human disturbances) to nestling nutritional condition and productivity. Female nestlings showed higher mean urea levels and lower glucose values than males, which could be related to higher growth rates and nutrient demand of females at the end of the nestling period. Seven parameters also showed variation with age, probably relating to increasing body mass, metabolic rates, and physical activity during the pre-fledging stage. Conversely, the IBCs showed poor correlations with selected nutritional parameters, probably due to the homogeneously acceptable nutritional conditions of the nestlings. Finally, we found that Ospreys did not seem to adjust initial parental investment in relation to habitat quality, since productivity was not affected by habitat indicators. However, in large broods, but not in small ones, nestling nutritional condition improved as foraging conditions improved. These results suggest that females that are in better physical condition seem to produce more and better nourished nestlings in better foraging conditions. Wir beurteilten Normalwerte für 15 biochemische Blutplasma-Parameter und drei Indizes für die Körperkondition (Indices of Body Condition-IBCs) bei freilebenden nestjungen Fischadlern (Pandion haliaetus) in Brandenburg (Deutschland). Die Werte wurden mit denen anderer Greifvogelarten verglichen und mögliche geschlechts-und altersabhängige Unterschiede wurden untersucht. Zusätz-lich haben wir denkbare Zusammenhänge zwischen der Habitatqualität-gemessen anhand der Lage von Gebieten der Nahrungssuche und anhand menschlicher Störung-und dem Ernährungszustand der Nestlinge sowie der Reproduktion untersucht. Weibliche Nestlinge zeigten höhere Harnstoff-Durchschnittswerte und geringere GlukoseWerte als männliche, was mit einer höheren Wachstumsrate und einem höheren Nährstoffbedarf bei den jungen Weibchen gegen Ende der Nestlingsperiode zusammenhängen kann. Sieben Parameter zeigten Veränderungen abhängig vom Alter, wahrscheinlich im Zusammenhang mit der zunehmenden Körpermasse, mit dem höheren Metabolismus und mit der steigenden körperlichen Aktivität während der

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Section: Effect Of Sex and Agesupporting

confidence: 69%

Section: Effect Of Sex and Agementioning

confidence: 94%

Section: Effect Of Sex and Agementioning

confidence: 99%

See 1 more Smart Citation

Factors affecting plasma biochemistry parameters and physical condition of Osprey (Pandion haliaetus) nestlings

Muriel

Schmidt²,

Calabuig

et al. 2013

J Ornithol

Self Cite

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“…In avians, increases in the plasma level of ALP activity appear to be associated with osteoblast or bone-forming activity. Such activity is present especially during skeletal growth after hatching (Campbell and Coles, 1986;Vinuela et al, 1991;Lumeij, 1997;Tilgar et al, 2004a). In the present study, skeletal growth was complete, excluding somatic growth as a causative factor.…”

Section: M Peltonen and S Mänttärisupporting

confidence: 43%

Is there life in the horny layer? Dihydropyridine and ryanodine receptors in the skin of female and male chickens (Gallus domesticus)

Peltonen

Mänttäri

2008

Journal of Experimental Biology

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SUMMARY Previous findings in pigeons and chickens show that Ca2+ may be accumulated inside the cornified skin cells and that Ca 2+ microenvironments with a lower-or higher-than-blood concentration may exist in the skin. It has been suggested that the skin may function as a secretory pathway or a reservoir for Ca 2+ recycling. To test this hypothesis, we studied the dermis and epidermis of female and male chickens in vivo to find out whether cellular mechanisms exist for the accumulation, recycling or secretion of Ca 2+. For calcium influx and intracellular Ca 2+ release, respectively, the density of dihydropyridine receptors (DHPRs) and ryanodine receptors (RyRs) was examined, using high-affinity (-)-enantiomers of dihydropyridine and ryanodine labelled with fluorophores. To investigate Ca 2+ utilization in the skin, the systemic and local activity of the enzyme alkaline phosphatase (ALP) and the concentration of ionic Ca 2+ were measured in plasma and in cutaneous extracellular fluid, collected by suction blister technique. We found that both DHPRs and RyRs were present in all skin layers from dermis to horny layer. However, receptor densities were highest in the surface layers. With a basic calcium-rich diet, receptor densities were higher in males, particularly in the dermis and mid-epidermis. After a reduction in the nutritional Ca 2+ input, receptor densities in males decreased to the same level as in females, in which the receptor densities were not affected by the amount of Ca 2+ in the diet or that resulting from coming out of lay. The extracellular concentration of ionic Ca 2+ per se was not found to affect the density of DHPRs and RyRs in the skin. Spatially, RyRs seem to be located in the periphery of the sebokeratinocyte. ALP activity was shown to be lower in the extracellular fluid than in the plasma in both sexes. However, activity in both extracellular domains increased significantly in females that had come out of lay. This was probably connected with the increased osteoblast activity related to the reformation of structural bone. In conclusion, voltage-sensitive L-type Ca 2+ channels for ion influx and RyRs for Ca 2+ release are present in the cells of the skin of female and male chickens. Higher densities in the males receiving excessive Ca 2+ imply an increased capacity for Ca 2+ influx and intracellular processing. Even though the functional interactions between DHPRs and RyRs in the sebokeratinocytes could not be demonstrated, peripheral colocation and high receptor densities at the level of exocytosis of the lamellar bodies point to their role as part of a signalling pathway for secretion. The finding that DHPRs and RyRs are present in the horny layer implies that the function of the outermost skin might be more active than had been previously thought and that this function might be both secretory and sensory.

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“…ALP is closely associated with the metabolism of Ca and P, and takes part in chondrogenic and osteoblastic activities in birds (Viñuela et al, 1991). It is influenced by many factors including water chemistry (Bowser et al, 1989), feed intake (Sauer and Haider, 1979), temperature (Sauer and Haider, 1977;Sakaguchi and Hamaguchi, 1979;Lie et al, 1988) and life stage (Johnston et al, 1994).…”

Section: Discussionmentioning

confidence: 99%

Dietary phosphorus requirement of juvenile black seabream, Sparus macrocephalus

et al. 2008

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Age-related variations in plasma levels of alkaline phosphatase, calcium and inorganic phosphorus in chicks of two species of raptors

Cited by 58 publications

References 24 publications

Factors affecting plasma biochemistry parameters and physical condition of Osprey (Pandion haliaetus) nestlings

Factors affecting plasma biochemistry parameters and physical condition of Osprey (Pandion haliaetus) nestlings

Is there life in the horny layer? Dihydropyridine and ryanodine receptors in the skin of female and male chickens (Gallus domesticus)

Dietary phosphorus requirement of juvenile black seabream, Sparus macrocephalus

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