Seasonal variations of the structure of the Spotted Tinamous (Nothura maculosa)

Abstract

Morphological data obtained by means of observation under an optic microscope in ovaries of the Spotted Tinamous (Nothura maculosa), are presented. The characteristics of the ovaries in winter recess and in time of breeding activity are compared. In the first period it is noticed the very reduced size of the organ; small follicles; numerous masses of follicle atresia and groups of vacuolated cells (full of lipids). In the second period the ovaries are well developed, the rate of follicle growth has increased, and active vitellogenesis takes place a minor number of atretic follicles and masses of cells full of lipids are observed. These characteristics and some less relevant ones are described and its significance is briefly discussed.