How invasive species affect agriculture


The presence of invasive animals on or adjoining farmland may cause lost agricultural production through:

  • predation on livestock
  • grazing on crops and pastures
  • spreading weeds
  • contributing to erosion
  • land and water degradation

They can reduce crop yields and many are unpalatable or toxic to livestock. In pastures, invasive weeds can produce virtual monocultures, which limits the variety of plants in the diets of livestock. Livestock will often not eat invasive plant species, instead they selectively feed on native plants.

How do invasive species affect the environment?

Invasive species, those introduced and spreading outside of their native range as a result of human activities, are a growing threat to environments worldwide. Environmental impacts of invasive species, one of the main causes of biodiversity loss, are well-studied.

How do invasive plants affect forage quality?

When invasive plants displace the target species in native plant communities or introduced monocultures, the result is almost always lower forage quality and production than the intended plant community. If a property is managed for wildlife, invasive plants often reduce plant diversity and negatively affect habitat. How Did They Get Here?

How many agricultural invasive species are there in the world?

We present an analysis of the threat from almost 1,300 agricultural invasive species to the world (124 countries). The analysis examines the global distribution of these species, international trade flows, and each country’s main agricultural production crops, to determine potential invasion and impact of these invasive species.

How are native species threatened by invasive species?

Native species may be threatened directly, such as ash trees targeted by the emerald ash borer, but invasive species can change ecosystems and cause the decline of native species in an indirect fashion. For example, downy brome in western grasslands has led to an increase in the frequency and intensity of wildfires.


What is an invasive species in agriculture?

In agriculture, invasive species is a very broad term that typically applies to any non-indigenous pests, weeds, plants, insects, fungi, bacteria, viruses, and other disease-causing agents that can interrupt the production of livestock, crops, ornamentals, and rangeland.

What invasive species affect crops?

Broomrape can infest about 30 broadleaf crops, including bell pepper, cabbage, carrot, celery, eggplant, melons, potato and tomato. The presence of broomrape in a field may force farmers to plant a less economical, non-host crop or to leave the field fallow.

What are the impacts of invasive species?

Invasive species are capable of causing extinctions of native plants and animals, reducing biodiversity, competing with native organisms for limited resources, and altering habitats. This can result in huge economic impacts and fundamental disruptions of coastal and Great Lakes ecosystems.

What are 3 devastating effects of invasive species?

The direct threats of invasive species include preying on native species, outcompeting native species for food or other resources, causing or carrying disease, and preventing native species from reproducing or killing a native species’ young. There are indirect threats of invasive species as well.

What does invasive mean for plants?

Invasive Plant A plant that is both non-native and able to establish on many sites, grow quickly, and spread to the point of disrupting plant communities or ecosystems.

How does invasive species affect food security?

Non-native animals that become invasive species damage food security by threatening crops. Their overpopulation may lead to a lack of their normal food supply. This means that they may turn to crops.

How do invasive species affect the economy?

The economic and social impacts of invasive species include both direct effects of a species on property values, agricultural productivity, public utility operations, native fisheries, tourism, and outdoor recreation, as well as costs associated with invasive species control efforts.

What are 4 impacts of invasive species?

impact water quality and quantity. degrade range resources and wildlife habitat. threaten biodiversity. alter natural fire regimes.

How invasive species affect economies?

Direct economic impacts of invasive species include management costs (mechanical, chemical, and biological), research and monitoring programs, reduced crop yield, job losses (such as in the case of reduced forestry production), damage to infrastructure, and impacts to international trade and tariffs.

How do invasive plants affect other plants?

Invasive plant species spread quickly and can displace native plants, prevent native plant growth, and create monocultures. A healthy plant community has a variety of herbs, shrubs, and trees. Invasive plants cause biological pollution by reducing plant species diversity.

What is the effect of invasive species on biodiversity?

Invasive alien species are animals, plants, fungi and microorganisms entered and established in the environment from outside of their natural habitat. They reproduce rapidly, out-compete native species for food, water and space, and are one of the main causes of global biodiversity loss.

How do invasive plants affect humans?

The damage that invasive species can cause to the environment and the economy are well known, but impacts on human health have been much less analysed. However, invasive species can cause impacts ranging from psychological effects, phobias, discomfort and nuisance to allergies, poisoning, bites, disease and even death.

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