Humans are at the top of the food chain, sustaining ever-growing populations through practices and activities that alter the world's food webs in various ways, affecting the biodiversity, stability and growth of ecosystems.
Humans are dominant consumers, affecting food webs through urban development, fishing, energy production and agriculture, as demands for food and shelter rise with population growth, affecting soil and aquatic ecosystems.
Humans change the food web by sustaining themselves through farming, livestock rearing and aquaculture pratices that increase the production of plants, meat and fish, but reduce the overall diversity of the natural food web.
The human pursuit of economic gain through poaching, trading, over hunting and overfishing can create food shortages at all levels, upsetting the natural balance.
Humans directly affect animal extinction, as habitat destruction caused by farming, pollution or large projects such as dams, and mass hunting result in mortality rates that rise above reproduction rates, threatening species, particularly top predators that are dependent upon diverse energy resources for food.
Human conservation efforts to preserve habitats, enforce stringent hunting and fishing laws and provide breeding programs at zoos may prevent extinction and promote biodiversity by reversing the effects of endangerment.
- Photo Credit "Enchantment in the hills" is Copyrighted by Flickr user: Athena's Pix (Athena Flickr) under the Creative Commons Attribution license.
How Long Can the Human Body Survive Without Food or Water?
The human body cannot survive without food and water for long periods of time. In fact, according to SurvivalTopics.com, the longest a...
The Bullwhip Effect in Supply Chain
The bullwhip effect occurs in a supply chain because buyers for a business overreact to fluctuation in customer demand. Overbuying goods leads...
What Foods Contain Human Growth Hormones?
Growth hormones are produced by the pituitary gland during childhood and adolescence. Production decreases as people enter middle age. Children who suffer...
How to Change My Dog From Wet to Dry Food
Switching your canine companion from wet food to dry kibble is not something that you can do overnight. For best results, and...
How Do Humans Affect the Nitrogen Cycle?
The nitrogen cycle is the process and movement of nitrogen through ecosystems, and humans affect the nitrogen cycle through the use of...
How Does Water Pollution Affect the Fish?
Water pollution affects the body chemistry of fish, changes the water temperature and affects the spawning of fish. Find out how water...