'maintain sustenance' is correct and usable in written English.
It means to ensure that something is maintained over a period of time. For example, "Lack of food security meant people had to work hard to maintain sustenance for their families."
Locals have a long history of applying adaptation measures to maintain their sustenance.
At a scale model of an ancient village in northern Kazakhstan, where horses were maintained for sustenance, I met Sandra Olson, the curator of anthropology at the Carnegie Museum of Natural History in Pittsburgh and a co-curator of the exhibit.
Every day he also had to cultivate vegetables on several garden plots for sustenance, and maintain public works including road-surfaces and the aluminium, diesel-powered longboats that bring visitors ashore.
But the data suggest this is not providing enough sustenance for the polar bears to maintain their weight, Obbard said.
In cancer cells the GSH levels maintain DNA synthesis, growth and multidrug/radiation resistance, and sustenance of GSH levels through GSH biosynthesis is vital for growth and survival of tumours.
Take adequate sustenance in the form of food and drink to maintain your energy and ensure adequate hydration.
In other words, it is the experience that the entrepreneur has gained in the process of venture creation, sustenance and growth that decides the kind of network they could create and maintain.
This is tied to the exactness of the mechanics of pollination, but it also means that orchids can no longer provide the only source of sustenance for the pollinator, and other flowers must be present in the biosphere to maintain visitors.
These systems were developed to maintain landscapes with healthy soil quality, a complex structure and diverse habitat composition, which favoured the sustenance of diverse species and a stable ecosystem functioning.
While we acknowledge and celebrate the accomplishments of the past, we would do well ethically to maintain a high level of awareness and vigilance of present-day agricultural production and labor practices, understanding that the continuing struggle of farmworkers and our own sustenance are intricately connected.
