Increased demand in the Atlantic is likely to keep Panamax trading into positive territory this week, shipbrokers said on Monday. They said Atlantic Capesize freight rates had risen in recent days, especially for Capesizes available for early loading positions and time-charters. Reports in the sector had suggested Belgium charterer Bocimar had time-chartered a number of Capesizes lately and freight rates had risen sharply on the back of anticipated demand in the area, shipbrokers said. A prime example was a Capesize transatlantic voyage trading at around $15,829 a day, or $1,000 over the rate charged last week for a similar trip. Continued interest in the South American market had also prompted a rise in rates for grain shipments out of the U.S Gulf…