Question

example about how a fresh water/ aquatic ecosystem can change into a land ecosystem over time.
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Answer 1

Respuesta:

Virtually all ecosystems on Earth have been significantly transformed by human activities. In the second half of the 20th century, ecosystems were modified at a faster rate than at any other time in human history. Some of the most important changes have been the transformation of forests and grasslands into farmland, the diversion and storage of fresh water in dams, and the loss of mangrove and coral reef areas.

Today, the fastest changes are taking place in developing countries, although industrialized countries experienced comparable changes in the past. However, current transformations appear to be taking place at a faster rate than pre-industrial ones: In marine ecosystems, populations of species subject to fisheries have been affected by the growing global demand for food for consumption human and animal. Since the beginning of industrial fishing, the total mass of marine species exploited for commercial purposes has decreased by around 90% in most of the world.

The creation of dams and the capture of water for human use has modified freshwater ecosystems, causing changes in the flows of many of the large river systems. Which in turn has led to other effects such as the reduction of sediment flows, which are the main source of nutrients for estuarine ecosystems.

As for terrestrial ecosystems, more than half of the area originally occupied by different types of grasslands and forests has been converted into agricultural land. The only terrestrial ecosystems that have undergone relatively little change are the tundra and boreal forests. However, climate change has started to affect them. In general, the transformation of ecosystems into agricultural land has begun to slow down. The possibilities of continuing to expand cropland are diminishing in many regions of the world because most of the appropriate land has already been transformed. Increasing agricultural productivity is also reducing the need for more farmland. In this sense, certain agricultural areas in temperate regions are being converted into forests or are not being cultivated.

Explicación:

you should summarize :( but I hope I have helped you <3