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Therefore, beaver appear to increase riparian vegetation given enough years to aggrade sediments and pond heights sufficiently to create widened, well-watered riparian zones, especially in areas of low summer rainfall. Beavers play an important role in seed dispersal for the water lily populations that they consume. [58]
Grassland in Europe. Grassland degradation, also called vegetation or steppe degradation, is a biotic disturbance in which grass struggles to grow or can no longer exist on a piece of land due to causes such as overgrazing, burrowing of small mammals, and climate change. [1]
The first environmental effect is increased crop growth, such as in the Rubaksa gardens in Ethiopia The irrigation that grows crops, especially in dry countries, can also be responsible for taxing aquifers beyond their capacities. Groundwater depletion is embedded in the international food trade, with countries exporting crops grown from ...
Alternately, high-N environments can have an indirect negative effect to seagrass growth by promoting growth of algae that reduce the total amount of available light. [ 70 ] Nutrient variability in seagrasses can have potential implications for wastewater management in coastal environments.
An additional threat to seagrass beds is the introduction of non-native species. For seagrass beds worldwide, at least 28 non-native species have become established. Of these invasive species, the majority (64%) have been documented to infer negative effects on the ecosystem. [121]
The term allelopathy from the Greek-derived compounds allilon-(αλλήλων) and -pathy (πάθη) (meaning "mutual harm" or "suffering"), was first used in 1937 by the Austrian professor Hans Molisch in the book Der Einfluss einer Pflanze auf die andere - Allelopathie (The Effect of Plants on Each Other - Allelopathy) published in German. [3]
Nymphaea mexicana is a rhizomatous, [5] aquatic, [6] perennial herb [7] with stoloniferous, [8] [5] up to 30 cm long, and 4 cm wide rhizomes. [8] The rhizomes bear leaf and root scars. [9]
Aside from driving down the population of native aquatic vegetation, A. philoxeroides can also influence the growth and yield of crops in pastures and fields. [8] These dense mats can affect the natural flow of water that is used in irrigation systems and as well as affect the quality of the water by increasing the sedimentation present in the ...