of conflict resolution in Swedish preschool; the teacher is positioned as a moral authority responsible for resolving and mediating in children's conflicts, and the children articulate their version of events.

The children's own individual versions of events are pursued further by the teacher, who asks Edwin a follow-up question: "and that wasn't how you played/å leken var inte så eller" (line 12) (she refers to Edwin's claim that Andy has taken many pieces and pushed). The next step in the investigation concerns the teacher's leading it toward the issues of responsibility and blame, causally linked to intentionality and prior knowledge. The teacher addresses what becomes the central point of their talk: did Andy know how play was supposed to be (line 14).

As demonstrated, the teacher leads the children's interactionalOne year weekly dynamics of limnological conditions and phytoplankton in Lake Bonilla, Costa Rica.
The detailed response of tropical lake phytoplankton to weather variations has been little studied, but it seems that composition varies in response to rain and wind variability over the course of the year. In order to gather more evidence on this variation, the weekly variability of phytoplankton composition was studied in Lake Bonilla, a low land (380 masl) 30 m deep tropical lake, from April 2010 to May 2011. Temperature variation at several depths was recorded automatically, and measurements of dissolved oxygen, water transparency, and nutrients were performed several times during the study period. The lake showed a warm monomictic pattern, with deep mixing occurring during the hemispherical winter, especially after a heavy rain period