iAfter adjusting harvest levels if any of the Harvest markers is on a space with a resource symbol on its left side, flip the marker on this resource’s Harvest track to the side with the arrow. This means the Harvest level of this resource will increase again. Then introduce changes caused by ecological dependencies and move every Harvest marker with the arrow side up by as many spaces as there are markers that previously landed on spaces with this resource symbol on their left (usually one, rarely two). These changes happen simultaneously and do not affect one another.