Local asphyxia of the environment (impact on marine biodiversity): The algae would constitute a sufficiently thick film to prevent the light from penetrating and thus limit the photosynthetic activity of the vegetation during a period of growth. The algae would therefore limit the extension of salt meadows. In addition, algae are degraded by aerobic bacteria causing significant oxygen consumption and the production of sulfur compounds (hydrogen sulphide in particular) resulting in a decrease in the biodiversity of the marine marsh. It can no longer play its purifying role, thus favoring the arrival of other pollutants in the marine environment.
Impacts on fauna (for example, birdlife): During periods of green tides, ulva cover areas exploited by birds in search of food. For example, passerines may have less access to insects usually found in the marine marsh and waders with burrowing shells and worms buried in the sand.
1. Sunlight warms the surface and water evaporates. 2. Warm, moist layer builds up between 1000 and 5000 feet. 3. Rising air currents organize into “thermals” 4. Water vapor in rising air parcels condenses to form clouds.
Owls eat shrews. If there are fewer shrews, then the owls have less to eat. With less to eat, they end up breeding less and/or starving more. So a crash in the shrew population will cause a reduction in the owl population.
