The ecosystem of a river is the river viewed as a system operating in its natural environment, and includes biotic (living) interactions amongst plants, animals and micro-organisms, as well as abiotic (nonliving) physical and chemical interactions. River ecosystems are prime examples of lotic ecosystems.arge rivers have comparatively more species than small streams. Many relate this pattern to the greater area and volume of larger systems, as well as an increase in habitat diversity. Some systems, however, show a poor fit between system size and species richness.
AT&T to Acquire Centennial Communications, Enhance Service for Wireless Customers and Businesses Dallas, Texas, Wall, New Jersey, November 7, 2008 AT&T Inc. (NYSE:T) and Centennial Communications Corp. (Nasdaq:CYCL) today announced that AT&T plans to acquire Centennial, a regional provider of wireless and wired communications services, for $944 million in cash.
The European Commission on Wednesday approved AT&T Inc.'s $85 billion acquisition of Time Warner Inc. , AT&T said in a release. The companies are expecting the deal to close by year-end. AT&T shares have gained 9% in the last 12 months, while Time Warner has gained 39%. The S&P 500 has gained 17%.