Terriculous Oligochaeta (Glossoscolecidae) of the Venezuelan Llanos

Seasonally variable riverine production in the Venezuelan llanos

We examined primary production, respiration, and nutrient dynamics in littoral areas of the mainstem and lagoons of the Cinaruco, a nutrient-poor river in the Venezuelan llanos. Gross primary productivity (GPP) was relatively high, given the poor nutrient conditions in this river. Seasonal variability in net ecosystem production (NEP) was also high, with highest values occurring in the dry seas...

Large ranches as conservation tools in the Venezuelan llanos

Traditionally, conservation efforts have concentrated on protecting plant and animal populations through the establishment of national parks and reserves. These protect only a small proportion of wildlife habitats and, in many countries, increasing their extent is difficult. This is certainly the case in many countries in Latin America, where enforcing wildlife protection laws is also difficult...

Burrowing activity of the geophagous earthworm Pontoscolex corethrurus (Oligochaeta: Glossoscolecidae) in the presence of charcoal

Ontogenetic diet shifts and resource partitioning among piscivorous fishes in the Venezuelan llanos

Resource utilization by nine abundant piscivores from a diverse tropical fish assemblage was examined over the course of a year. All nine species exhibited peak reproduction during the early wet season and a similar sequence of size-dependent shifts from a diet composed primarily of microcrustacea, to aquatic insects, and finally fishes. Three piranha species specialized on fish firis, particul...

the effect of taftan pozzolan on the compressive strength of concrete in the environmental conditions of oman sea (chabahar port)

cement is an essential ingredient in the concrete buildings. for production of cement considerable amount of fossil fuel and electrical energy is consumed. on the other hand for generating one tone of portland cement, nearly one ton of carbon dioxide is released. it shows that 7 percent of the total released carbon dioxide in the world relates to the cement industry. considering ecological issu...