Britannica
Sources used in this answer
Why are biodiversity effects a concern in debates about genetically modified crops?
Created from Britannica articles
using AI.
AI can make mistakes, so verify using Britannica articles.
genetically modified organism
Genetically modified crops are assessed for their impact on environmental factors such as soil quality.
Concerns regarding the impact of genetically modified organisms (GMOs) on biodiversity primarily stem from how these crops alter agricultural practices and ecosystems.12
Key concerns include:
- Reduction of Plant Diversity: Many GMOs are engineered for herbicide tolerance, allowing fields to be sprayed liberally to eliminate all vegetation except the cash crop. This practice reduces weed diversity in and around fields, which in turn diminishes the habitat and food sources available for other species.3
- Impact on Pollinators and Wildlife: The increased use of herbicides, such as glyphosate, to manage these crops has been linked to population declines in beneficial insects, including the monarch butterfly, by destroying their host plants. Furthermore, chemical runoff can negatively affect local wildlife, including amphibians.32
- Gene Flow: There is a risk that engineered genes from GMOs may inadvertently enter into wild populations, potentially altering the genetic makeup of non-modified organisms.1
- Monoculture Expansion: GMOs are often grown in monoculture systems, which inherently support less biodiversity than polycultural systems and rely heavily on chemical inputs that can further degrade surrounding environmental health.32