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1

Extra-pair paternity in a socially monogamous Neotropical tanager, the Ringed Warbling-finch Poospiza torquata

100%
Sanchez R., Blendinger P. G., Xuereb A., Lougheed S. C.
Acta Ornithologica
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2017
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tom 52
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nr 2
2

Temporal and spatial differences in the feeding ecology of the Spanish Imperial Eagle Aquila adalberti during the non-breeding season: effects of the rabbit population crash

100%
Sanchez R., Margalida A., Gonzalez L. M., Oria J.
Acta Ornithologica
|
2009
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tom 44
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nr 1
The paper describes the diet of territorial Spanish Imperial Eagles during the non-breeding season, comparing prey identified across different regions (Central, Western and Southern), breeding season vs non-breeding season, and periods (1983-1985 or pre-viral haemorrhagic disease [RHD] vs 1991-2000 or post-RHD). Comparison of the nonbreeding with the breeding season revealed a slight variation in the diet. The Rabbit Oryctolagus cuniculus continues to be the most important prey species in the eagle's diet during the non-breeding season, followed by pigeons and the Red Partridge Aledoris rufa, although this varies from one region to another. In general, the decrease in the rabbit population after the epizooty (RHD) does not appear to have had an impact on the occurrence of this prey species in the Spanish Imperial Eagle's diet. Although this species is generally considered to be specialised in the capture of rabbits, the variability found between regions suggests that when the main prey (wild Rabbit) is scarce, the Spanish Imperial Eagle's diet is based on alternative prey such as pigeons or carrion.
3

Intracytoplasmic sperm injection affects embryo developmental potential and gene expression in cattle

100%
Arias M. E., Risopatron J., Sanchez R., Felmer R.
Reproductive Biology
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2015
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tom 15
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nr 1
4
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
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Histopathological study of Corydoras micracanthus (Siluriformes: Callichthyidae) parasitized by the nematode Procamallanus (Spirocamallanus) pintoi (Camallanidae) from Lesser River, northwestern Argentina, South America

88%
Ailan-Choke L. G., Sanchez R., Cremonte F., Ramallo G., Davies D.
Annals of Parasitology
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2019
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tom 65
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nr 3
The nematode parasites can cause mechanical injuries such as irritation or atrophy of tissue and occlusions of the digestive tract, blood vessels or other ducts in their hosts. Some species belonging to the family Camallanidae have been the focus of histopathological studies because they lacerate the host´s intestinal wall with their buccal capsule. In this study, we describe the histopathological effects produced by Procamallanus (Spirocamallanus) pintoi in the small fish Corydoras micracanthus from Lesser River, in the northwest of Argentina, South America. The samples were processed with routine histology techniques. At light microscopy, specimens of P. (S.) pintoi were observed occupying the lumen of the gut. The histopathological sections revealed damage to the host intestine with the total destruction of the mucosa and submucosa, observed mainly in the region which is surrounding the buccal capsule of parasites. Moreover, an inflammatory reaction was observed with lymphatic accumulations in the affected tissue. This kind of degenerative and necrotic changes in the mucosa could affect negatively the absorption function of the host intestine, which may have adverse effects of the health status of fish. The present study provides the firs data about the histopathological effects of P. (S.) pintoi in C. micracanthus.
5

Space use of adult Spanish Imperial Eagles Aquila adalberti

88%
Fernadez M., Oria J., Sanchez R., Gonzalez L. M., Margalida A.
Acta Ornithologica
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2009
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tom 44
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nr 1
The ranges and space use of eight radio-tracked Spanish Imperial Eagles are described. The annual mean range was 25 146 ha during the breeding season (BS) and 20 557 ha in the non-breeding season (NBS). The eagles were found up to 35.9 km away from their nest during BS and nearly 62 km away during NBS. The maximum total distance covered in one day was 113.6 km, with males flying longer distances than females during BS. There was less overlap between ranges during BS, and the mean home range varied from 3881 ha in BS to 2085 ha in NBS. The areas where territorial behaviour (display flights, defence and/or aggression) was observed contained the nest-tree, the most frequently used perches, and the feeding ground nearest to the nest. Breeding home ranges were negatively correlated with densities of Rabbits Oryctolagus cuniculus. Breeding eagles whose home range had low rabbit densities travelled 16.2-28.9 km from their nest to reach distant, undefended feeding grounds with much higher rabbit densities. Our results suggest that home ranges varied with prey density and a bird's reproductive status. Larger breeding ranges are probably related to an increase in energy requirements, while habitat quality is probably a regulatory mechanism of space use. In terms of home range analysis methodology, our observations of eagle behaviour favour Cluster Analysis over Kernel, particularly for defining distant feeding grounds.
6
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Expression of oestrogen and progesterone receptor and intermediate filament proteins in the oviduct of mares with endometrosis

76%
Profaska M., Gurgul A., Kotula-Balak M., Rak A., Sanchez R., Zajac S., Witkowski M.
Animal Science and Genetics
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2023
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tom 19
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nr 4
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