Widespread deoxygenation of temperate lakes

Mechanisms of the Deoxygenation of the Hypolimnia of Lakes

The deoxygenation of the hypolimnia of lakes and reservoirs normally occurs as a combined result of the sediment oxygen demand and the oxygen demand of the algae and other plant materials that grow in the epilimnion. For some waterbodies, there may be appreciable amounts of oxygen-demanding material brought in from the watershed, but this is usually a relatively unimportant source of oxygen dem...

Terrestrial dominance of organic matter in north temperate lakes

[1] Aquatic ecosystems are hotspots of decomposition and sources of carbon dioxide to the atmosphere that are globally significant. Carbon exported from land (allochthonous) also supplements the carbon fixed by photosynthesis in aquatic ecosystems (autochthonous), contributing to the organic matter (OM) that supports aquatic consumers. Although the presence of terrestrial compounds in aquatic O...

Environmental Control of Methanotrophic Bacteria in Temperate Lakes

Food-web stability signals critical transitions in temperate shallow lakes

A principal aim of ecologists is to identify critical levels of environmental change beyond which ecosystems undergo radical shifts in their functioning. Both food-web theory and alternative stable states theory provide fundamental clues to mechanisms conferring stability to natural systems. Yet, it is unclear how the concept of food-web stability is associated with the resilience of ecosystems...

Lake restoration and biomanipulation in temperate lakes: relevance for subtropical and tropical lakes

This introductory chapter to the book “Tropical eutrophic lakes: their restoration and management” gives a summary survey of the responses of temperate lakes to increased nutrient loading (the eutrophication process) and during remediation. Chemically and biologically conditioned resistance may cause a delayed response to the nutrient loading reduction and different methods of overcoming this r...