In agricultural settings, lack of habitat for predators often limits this weed predation. Many weed seeds are also lost through decay after being infected with fungi or various microorganisms . Weed seed can be physically moved from one area to another. Many weed seeds have special anatomical features that allow them to be blown by the wind or attached to the coats of animal or clothes of humans. Some seeds can survive the digestive tracts of animals and are carried away with the animal until they are excreted, often far from where they were consumed.
Water is an effective transporter of weed seed.
Habitats that are occasionally flooded frequently have a more diverse weed population due to deposition of new species . Field machinery, especially tillage and harvesting equipment, can carry seeds out of an area to be re-deposited in a different area. Losses from the seedbank due to movement are generally small when compared to the total seed bank, but these seeds are important because they can introduce weeds into areas where they weren't previously found. Each weed species has certain biological charateristics that allow it to survive and thrive in specific habitats. Likewise, each habitat contains weeds that are adapted to the specific environmental conditions available.