Lakes as integrated systems
After arriving at Yale in 1928, Hutchinson and his students measured temperature, water clarity and geochemical conditions at sites including Linsley Pond. Seasonal measurements connected organisms with nutrient cycling and physical conditions.
References: [1]
A multidimensional niche
Concluding Remarks (1957) formalized niches using multiple environmental dimensions. Axes such as temperature and food describe combinations permitting a species to persist, rather than simply its geographical address.
The paradox of the plankton
Why can many plankton species coexist when they compete for limited resources? Hutchinson’s 1961 discussion stressed changing environmental conditions and seasonality, which can prevent the simple static equilibrium imagined in competition arguments.
References: [1]
Extending the framework
His distinction between fundamental and realized niches emphasized competition and predation. Subsequent work also considers positive interactions, in which other species can make otherwise unsuitable conditions usable.
References: [2]