A two level quasi-geostrophic model for zonally averaged conditions has been integrated for a period of a few years. The model is forced by Newtonian heating and has internal and surface friction. The interaction between the zonal flow and the eddies is simulated through the use of exchange coefficients for the transports of quasi-geostrophic potential vorticity and sensible heat. The results o...

Abstract Reproductive tactics and strategies contribute to the persistence maintenance of long-term populations in fish species. Members subfamily Goodeinae are a group small-bodied freshwater with specialized reproduction (viviparity-matrotrophy). They found highlands central Mexico, most them endemic. The aim this study was conduct comprehensive investigation evaluate annual reproductive cycl...

Influenza disease impacts every year up to 10% of the world's population, i.e. up to 500 millions of people. The international surveillance network organised by WHO allows the detection of important antigenic variation of the virus in humans but also animals (especially birds and pigs). Epidemiological data are summarised twice a year in two meetings (one in February, the other in September) al...

This work presents information regarding the biology and state of conservation of an endangered annual fish Hypsolebias antenori. Fish were captured from small seasonal pools located in Northeastern Brazil. The total body length, body mass, sex ratio, first sexual maturity were investigated. The sampled population showed sexual dimorphism. There was a predominance of females (60%) over males (4...