Grassland Ecosystem Quotes

Compared to forest or aquatic ecosystems, grassland is unstable. It requires rather precise geological and climatic conditions, and if these conditions are not maintained--if too much rain falls, or too little--it quickly turns into forest or desert, both of which are dominated by woody plants. This instability is reflected in the spectacular but brief careers of various grassland faunas. Humanity, with its dazzling symbioses, preadaptations, and neoteny, is the most spectacular of these--and may well be the briefest.

It is hypocritical to exhort the Brazilians to conserve their rainforest after we have already destroyed the grassland ecosystem that occupied half the continent when we found it. A large-scale grassland restoration project would give us some moral authority when we seek conservation abroad. I must admit that I also like the idea because it would mean a better home for pronghorn, currently pushed by agriculture into marginal habitats-The high sagebrush deserts of the West. I would love to return the speedsters to their evolutionary home, the Floor of the Sky. Imagine a huge national reserve where anyone could see what caused Lewis and Clark to write with such enthusiasm in their journals-the sea of grass and flowers dotted with massive herds of bison, accompanied by the dainty speedsters and by great herds of elk. Grizzly bears and wolves would patrol the margins of the herds and coyotes would at last be reduced to their proper place. The song of the meadowlarks would pervade the prairie and near water the spring air would ring with the eerie tremolos of snipe.

The mutualistic relationships between bees, the flowers that they pollinate, and the bacteria that live within the roots of those plants are at the heart of the functioning of a natural, species-rich meadow. The problem is that these relationships can be ruined by application of a sack of fertiliser, which allows the grasses to swamp the legumes and other wild flowers, swiftly resulting in a bright green, flowerless sward, with no legumes, no Rhizombium, and no bees. In the farming world this is known as "improved" grassland. In the 1940's Britain had in the region 15 million acres of flower rich grasslands. It is hard to get precise figures, but about 250,000 acres remain; a staggering loss of over 98 percent. Fertilisers were cheap, and successive governments were keen to persuade farmers to boost productivity, so ecosystems that had taken hundreds of years to develop were subject to swift and wholesale destruction.

If the ecological community is ever achieved in practice, social life will yield a sensitive development of human and natural diversity, falling together into a well balanced, harmonious whole. Ranging from community through region to entire continents, we will see a colorful differentiation of human groups and ecosystems, each developing its unique potentialities and exposing members of the community to a wide spectrum of economic, cultural and behavioral stimuli. Falling within our purview will be an exciting, often dramatic, variety of communal forms—here marked by architectural and industrial adaptations to semi-arid ecosystems, there to grasslands, elsewhere by adaptation to forested areas. We will witness a creative interplay between individual and group , community and environment, humanity and nature. The cast of mind that today organizes differences among humans and other lifeforms along hierarchical lines, defining the external in terms of its "superiority" or "inferiority," will give way to an outlook that deals with diversity in an ecological manner. Differences among people will be respected, indeed fostered, as elements that enrich the unity of experience and phenomena. The traditional relationship which pits subject against object will be altered qualitatively; the "external," the "different," the "other" will be conceived of as individual parts of a whole all the richer because of its complexity. This sense of unity will reflect the harmonization of interests between individuals and between society and nature. Freed from an oppressive routine, from paralyzing repressions and insecurities, from the burdens of toil and false needs, from the trammels of authority and irrational compulsion, individuals will finally, for the first time in history, be in a position to realize their potentialities as members of the human community and the natural world.

Grassland ecosystems greatly expanded about 25–30 mya.9 That rumination is a particularly successful way to deal with cellulose is evidenced by the fact that bovids and other ruminants largely replaced other large mammalian plant eaters that employed different digestive methods—such as horses, titanotheres, rhinos, and tapirs—at about this time.10

These landscapes aren’t exactly native. Instead, they bear a striking resemblance to another part of the world, one that most of the designers and artists creating them had never visited: the African savanna. Much of East Africa is covered in savanna, an ecosystem consisting of rolling grasslands punctuated by clusters of trees. While there’s some debate among paleontologists about just how much of hominid evolution took place on the savanna, there’s little doubt that it was a significant habitat for early humans.

Many parts of the natural world we take for granted today are relatively recent arrivals. Grasses, the main component of the largest ecosystems of the planet today, only arose at the very end of the Cretaceous, less than 70 million years ago, as rare parts of the forests of India and South America. Grass-dominated ecosystems did not emerge until about 40 million years before the present. There were never dinosaur grasslands, and, in the northern hemisphere, grass simply did not exist.

Australia had mallee, a semi-arid ecosystem with grasses, shrubs and small trees. Retallack’s research demonstrates that African grassland soils contain significantly more carbon than do Australian mallee soils, even when mean annual precipitation is the same. Retallack attributes the difference to the wealth of hoofed mammals in Africa’s savanna. “Australia presents us with a view of what the world was like before the evolution of grasslands,” says Retallack.13