Claudio Alvarenga de Oliveira

• Abstract

  In birds, reproductive morphological, physiological, and behavioral adaptations are regulated by neuroendocrine mechanisms in response to specific environmental factors. However, studies related to the knowledge of those mechanisms in birds belonging to the Strigidae family are sporadic. The purpose of this research is to provide innovative knowledge related to reproductive biology of the…

  Seasonal gonadal, endocrine, and genetic changes during the reproductive and non-reproductive phases in nocturnal birds of prey, AP.R

• Abstract

  Thyrotoxicosis and hypothyroidism produce adverse effects on the reproductive function of male men and animals. Hypothyroidism is associated with hypogonadism, reduction in the testosterone serum concentrations e other androgens, and sperm morphological abnormalities and thyrotoxicosis induces alterations in sperm motility. However, the mechanisms by which the thyroid hormones interfere w…

  Consequences of hypothyroidism and thyrotoxicosis triggered in adulthood on male gonadal function: gene expression of molecular markers and proteomic profile in tissues of the hypothalamic-pituitary-gonadal axis, AP.R

• Abstract

  The Abrolhos bank (16°40' to 19°30'S; 37°25 to 38°57'W) comprises the greatest coral reef biodiversity not only in Brazil, but in all South Atlantic. It is also the main calving and mating area of Humpback whales (Megaptera novaeangliae) in South Western Atlantic. The whales migrate from feeding areas in low latitudes to warmer waters to breed and give birth in the winter. A better unders…

  Use of blubber as matrix to measure sexual steroid levels of humpback whales (Megaptera novaeangliae), AP.R

(Only some records are available in English at this moment)

• Abstract

  Tuco-tucos (Ctenomys aff. knighti) are solitary subterranean rodents that occur in the semi-arid northwest of Argentina. Their activity pattern is nocturnal in laboratory, but diurnal in field. Studies investigating the discrepancies between diurnal and nocturnal activity indicate that in nature the activity rhythm is plastic and influenced by a combination of biotic and abiotic factors, …

  Investigation of seasonality and plasticity of daily activity patterns in a subterranean rodent (Ctenomys aff. knighti) using noninvasive methods of endocrine monitoring, BP.PD

• Abstract

  Knowing the dynamic and structure of wild populations is essential for the consolidation of management plans and conservation programs, therefore it is necessary the knowledge about biology, ecology and physiology of the species. We need to ensure accurately the sex and age of the animals in order to have proper results, though it becomes imprecise for certain species. In the case of jagu…

  Testosterone concentrations in hair sample of jaguar (Panthera onca) according to age group, BP.IC

• Abstract

  Quantifications of sexual steroids, such as estradiol and progesterone, because of their importance, have been widely used in a great number of animal´s reproduction´s researches for the study of physiology in different species. Several methods and antibodies to quantify analytes in different biological fluids have been being developed, but each analytical methodology has its advantages a…

  Evaluation of multi-analyte immunoassay to quantify sexual steroids in domestic animals., BP.DR

(Only some records are available in English at this moment)