We have over 12,000 students, from over 100 countries, within one of the safest campuses in the UK


93% of Lancaster students go into work or further study within six months of graduating

Home > Research > Publications & Outputs > Transition zones in small lakes
View graph of relations

« Back

Transition zones in small lakes: the importance of dilution and biological uptake on lake-wide heterogeneity

Research output: Contribution to journalJournal article


Journal publication date12/2011
Number of pages13
Early online date15/09/11
Original languageEnglish


Stream inflows are frequently the dominant route for nutrients from catchments to lakes. Studies on large, deep reservoirs and lakes have shown the importance of the fate of inflow plumes for nutrient accessibility to phytoplankton. However, few studies have considered shallow water transition zones between streams and lakes, often a feature of small lakes. This study examined the spatial and temporal dynamics of phosphorus in a shallow stream-lake transition in a small lake to improve our understanding of how phosphorus reaches the pelagic zone. Despite the high discharge levels, and the importance of dilution in explaining observed spatial gradients in soluble reactive phosphorus (SRP), total phosphorus (TP) and chlorophyll a, we found evidence for significant biological uptake of SRP in the inflow embayment during the growing season. This may represent an additional mechanism for the dispersal of phosphorus from the embayment into the lake. The length scale for the transition zone was short (~150 m) which indicated that the direct influence of the inflow on the wider lake was small. However, SRP measurements taken only from the pelagic site underestimated mean lake-wide concentrations when including transition zones by up to 18% during the growing season.