How will Animals and Plants work in a Far Future Terraformed Martian Ecosystem

How will Animals and Plants work in a Far Future Martian Ecology. From the writer of The Terraformers’ Toolkit. (The Terraformers’ Toolkit: Everything you have ever wanted to know about terraforming and our future in space. The where, why, when, how and what of terraforming.) www.amazon.co.uk/dp/B09X6739P...
Food production
Growing crops in cold counties is limited to the short summer. However, Mars with its larger orbit and longer year will have longer summers. This gives farmers a better chance of feeding the population even in a cold climate.
Depending on its eventual terraformed temperatures Mars may have an equatorial corn belt. But fruit may be easier as trees are more resistant to cold weather and don’t need replanting each year. Therefore there might be extensive orchards and fields full of gooseberries and currents, probably with honeybee hives which would provide pollination services and honey for human consumption.
On Earth we can buy foods grown in tropical countries, but they wouldn’t have this on Mars, instead Greenhouses would be very important for growing tender, warm climate plants not tolerant of Mars’ cold temperatures.
In places where there are caves or lava tubes mushrooms could be grown as an additional food supply for the colonists.
Harvesting natural products from nature may be more important than farming as a means of feeding the population. It would be easier than farming and would produce food even in environments where we couldn’t farm, for example where the soil is too thin, the temperatures too cold, the light too dim, the soil too toxic or the slope too steep. This means that nature would have to work optimally and efficiently to produce an excess which could be used by people. Ultimately it will be about converting chemicals we can’t eat into ones we can.
Forest and grassland
Colder forests in both hemispheres will be mostly composed of cold tolerant conifers, though closer to the equator broadleaved trees will predominate.
In the Serengeti in Africa elephants both destroy and plant forests. They push trees down to get at their nutritious leaves and fruit, and they plant new trees by depositing seeds in their dung. Animals which could do this on a terraformed Mars would be just as important. These might include de-extinct mammoths, but mammoths may have been grass rather than leaf eaters. Browsers would certainly include forest animals like wood bison, moose and forest caribou, but others might need to be found.
The presence of large browsers and their tree destroying activity would reduce the risk of fire. This may be more severe in the southern hemisphere because of its distance from the northern ocean and probable lower rainfall. Ensuring that there are large areas of grassland would prevent fires spreading and allow grazing animals to exist in large numbers.
Predators
Colonists might be tempted to prevent the introduction of predators to Mars, but Predators do a number of important things to help provide us with food. Firstly predators like wolves prevent browsers such as elk from staying in one place and destroying vegetation. This means that beavers can dam the rivers, preventing flooding and drought, and making homes for fish such as perch and trout. Secondly they control the numbers of deer and prevent the spread of disease.
Smaller predators like wolverines, coyotes, badgers and lynx perform similar functions over their own prey species, preventing over browsing and disease.
Additionally including super, top level predators, like snow leopards and Siberian tigers would keep a control on the wolf population and reduce the chance of them killing farm animals.
Hunting
Mars would not be a nature reserve, but rather it would be a natural ecosystem which would provide an excess for human use. This might mean trees for building, willow for basket making or elk for the dinner table. Humans would be able to hunt provided they didn’t disturb the natural balance of the ecosystem risking local extinctions and potential damage to the food supply.
In a planet full of wildlife animals may occasionally need to be moved or culled where they cause problems for the colonists. But again the natural balance of nature would need to be maintained so that an excess was available.
Extinction risk
There remains a risk that critical species will no longer exist due to human population rise and climate change when they are needed on Mars. This means that some would need to be kept in zoos or in wildlife parks. As well as the larger species this extinction risk also applies to microorganisms and other soil life like earthworms and Protozoa.