These are examples of the projects, publications and data sets used to answer the NTL framework question. Other projects and data sets may be found using the keywords 'long-term change', 'climate forcing', 'drivers', or 'ecosystem services'.
The rusty crayfish, a species native to Ohio and Indiana, has been invading lakes throughout northern Wisconsin for the past several decades. This exotic species has the ability to outcompete native crayfish species (Hill and Lodge 1999) and often replaces native crayfish species in the lakes it invades. In addition, the rusty crayfish often occurs at higher population densities than the native species and has been associated with reductions in macrophyte biomass ....
NTL has transformed our understanding of aquatic ecosystems by pioneering new approaches and perspectives for studying these environments. These transformations include:
Synthesis of long-term records of lake and river ice duration throughout the Northern Hemisphere provided evidence that freshwater ecosystems are responding to climate change over the past 150 years.