Wyniki wyszukiwania - Biblioteka Nauki

1

Superpositions of regular moults in Mus musculus

100%

Palomo L. J. , Vargas J. M. , Pozueta F. J.

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tom 39

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nr 4

EN

The number, topographic sequence and duration of the moults of the coat of Mus musculus Linnaeus, 1758 are analysed using wild specimens from collections and albino specimens born and kept in the laboratory. Mice undergo an uninterrupted series of regular moults throughout its life. Each has a typical duration. The juvenile moult is the fastest and in all cases the speed of moulting is unconstant. At first the rate is accelerated but it frequently decelerates, and even pauses, so that some parts of the body, mainly the cephalic area, do not moult. This pause leads to a superposition of waves of different moults with the coexistence of 3 or more coats. The superpositions, revealed by dying the laboratory animals' coats, could be the reason why previous authors have claimed the existence of irregular moults in M. musculus. With the wild specimens, despite the fact that the inner surface of the skin yields less information, moulting patterns, similar to those described in the laboratory specimens, may be detected.

2

Moulting patterns in Clethrionomys gapperi

75%

Sare D. T. J. , Millar J. S. , Longstaffe F. J.

Acta Theriologica

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2005

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tom 50

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nr 4

561-569

EN

Small northern mammals undergo regular developmental and seasonal moults. However, the moulting patterns of many small mammals are not well known. Development and subsequent moulting of the pelage was documented in adult red-backed volesClethrionomys gapperi Vigors, 1830 and their offspring in relation to age, weight, and sex. Red-backed voles exhibited 4 developmental pelages (nestling, juveniles, subadult, and adult) through diffuse, rapid hair growth. Rapid growth was associated with early moulting at the nestling, juveniles and adult stages. However, a trade-off between moulting and growth existed at the subadult stage such that delayed moulting was associated with rapid growth. Adult voles completed a unique moult progression with highly variable timing. Male and femaleC. gapperi showed no differences in pattern or locations of moulting. Variation in the number and timing of moults in small mammals may reflect differences in life-history strategies and highlights the need for a consistent mammalian pelages and moults nomenclature.

3

Repeatable length and mass but not growth rate of individual feathers between moults in a passerine bird

63%

De La Hera I. , Perez-Tris J. , Telleria J. L.

Acta Ornithologica

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2009

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tom 44

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nr 1

EN

Plumage is regularly replaced over the lifetime of birds, and, consequently, variable conditions experienced during plumage development can affect feather growth rate or the expression of feather characteristics. We assessed intra-individual constancy in the length, mass, and growth rate of tail feathers between complete moults of 13 free-living individual Blackcaps Sylvia atricapilla. Between-moult repeatability was high for the length and mass, but not for growth rate of individual tail feathers. The feathers produced in the later moult grew at a slower rate, which shows that the time to produce similar feathers increases with age.

PL

Upierzenie jest regularnie wymieniane podczas całego życia ptaka, przez co zmienne warunki środowiska panujące podczas pierzenia, mogą wpływać na tempo wzrostu czy wielkość piór. Dorosłe osobniki z lokalnej osiadłej lęgowej populacji kapturki były łapane w latach 2001-2007, od każdego pobierano piątą sterówkę. 13 osobników złapano po dwóch kolejnych pierzeniach i porównano długość, masę i tempo wzrostu ich sterówek. Stwierdzono dużą powtarzalność długości i masy piór między kolejnymi pierzeniami, natomiast nie stwierdzono podobnej korelacji dla tempa wzrostu (Fig. 1). Uzyskane wyniki wskazują, że pióra w kolejnych pierzeniach rosną wolniej, a więc czas potrzebny na osiągnięcie przez nie podobnej długości i masy jest większy. Może to być związane ze starzeniem się organizmu, większym lokowaniem zasobów w inne aktywności, lub odzwierciedlać pewne dopasowanie do zmieniających się warunków środowiska.

4

Wing lengths of Clamorous Reed Warblers Acrocephalus stentoreus in Israel

63%

Morgan J. H.

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2004

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tom 26

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nr 2

5

Juvenile Blackbird [Turdus merula] moulting primaries and secondaries

63%

Zielinska M. , Zielinski P. , Mokwa T.

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nr 1

6

Ontogenesis of pelage and seasonal moulting in Microtus brandti [Radde, 1861]

63%

Stubbe A. , Wiegand S.

Polish Ecological Studies

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1994

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tom 20

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nr 3-4

7

Fifteen years of the Common Snipe [Gallinago gallinago] study at the Jeziorsko Reservoir with some notes about weight and moult

51%

Wlodarczyk R. , Kaczmarek K. , Bargiel R.

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nr 1

8

Variation in the extent of greater wing coverts moult in Robins [Erithacus rubecula] migrating in autumn through the Polish Baltic coast

51%

Ginter M. , Rosinska K. , Remisiewicz M.

The Ring

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2005

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tom 27

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nr 2

9

Serum alpha-MSH and follicular alpha-MSH receptor levels during the autumnal molt in mink

51%

Le Grande C. E.

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tom 29