Changes in the number of Na+-K+-ATPase alpha-subunits, Na+-K+-ATPase activity and glycogen content of the crucian carp (Carassius carassius) brain were examined to elucidate relative roles of energy demand and supply in adaptation to seasonal anoxia. Fish were collected monthly around the year from the wild for immediate laboratory assays. Equilibrium dissociation constant and Hill coefficient ...

Climatic conditions represent one of the main constraints that influence avian calling behavior. Here, we monitored daily activity Undulated Tinamou (Crypturellus undulatus) and Chaco Chachalaca (Ortalis canicollis) during dry wet seasons in Brazilian Pantanal. We aimed to assess effects climate predictors on vocal these focal species evaluate whether may vary among seasons. Air temperature was...

 Seasonal changes of the thyroid gland structure and hormones secretion was examined in yellowfin seabream (Acanthopagrus latus) in the northwest of Persian Gulf (Musa creek). Thyroid gland composed of follicles scattered around the ventral aorta, near the gills. Follicular cells varied according to secretion of the gland during warm and cold seasons. Thyroid hormones (Triidothyronine [T3] and ...