Apr 1, 1994 · Blood samples were collected throughout the year from yellow-eyed penguins on the Otago Peninsula, South Island in order to characterise relationships between steroid …

Blood samples were collected throughout the year from yellow-eyed penguins on the Otago Peninsula, South Island in order to characterise relationships between steroid hormone levels …

Jan 15, 2004 · The aim of the present paper is thus to clarify changes in circulating thyroxine, triiodothyronine, and sex steroid hormones in relation to reproduction and molting in Humboldt …

We conducted a physiological study on captive Humboldt penguins and obtained results indicating that changes in sex steroids and thyroid hormones affect the short duration molt of the species.

Gonadal macro- and micro-anatomy reflect African penguin breeding status. Male and female African penguins have matching reproductive steroid levels. Confirmation of two distinct …

On the Crozet Islands, king penguins therefore appear to be able to fledge a chick only in alternate years (Barrat 1976; Weimerskirch et al. 1992). The aim of this study was to correlate …

Temporal changes in plasma levels of luteinizing hormone (LH), testosterone, estradiol, and progesterone were measured throughout molt and the onset of reproduction in free-living male …

The endangered, endemic Yellow-eyed penguin (Megadyptes antipodes) is one of the flagship species for New Zealand's wildlife tourism, and recently concern has been raised that tourism …

Jul 1, 2010 · We directly compared faecal and plasma hormone measurements for the first time in a wild free-living species, the Adelie penguin (Pygoscelis adeliae). Blood and faecal samples …

Steroid patterns present classical variations of level according to the reproductive stage. Prolactin (PRL) and luteinizing hormone (LH) are antagonists but, in this species, PRL remains high …