Patrones ecológicos y variación cíclica de la estructura trófica de las comunidades nectónicas en lagunas costeras del Pacífico de México

Abstract

Trabajo presentado en el Simposio "Marine Sciences in the Americas" Interciencia Association, en Panel II "Ecology and Environmental Protection", San José, Costa Rica, 2 al 7 de julio, de 1977. Publicado con anterioridad en An. Centro Cienc. del Mar y Limnol. Univ. Nal. Autón. México, 5: 287-306, 1978.

Contribución 82 del Centro de Ciencias del Mar y Limnología, UNAM.

The coastal lagoons of the state of Guerrero (central Pacific coast of Mexico), present an environmental physiology cycle with three ecological annual periods: Period 1 (salinities from 15 to 34°/oo), from August to November, lagoons in contact with the sea through an open pass in the barrier bar, permitting a biological, physical and chemical exchange. Period 2 (salinities higher than 35°/oo), from November to May, lagoons isolated from the sea and evaporation exceeds freshwater input, there is a minimum volume of water inside the lagoons. Period 3 (salinities lower than 15°/oo), from May to August, lagoons isolated from the sea and freshwater input exceeds the rate of evaporation, there is a maximum volume of water inside the lagoons.