To prevent flooding, concrete channels were built to line the LA River and the Arroyo Seco, how does

To prevent flooding, concrete channels were built to line the LA River and the Arroyo Seco, how does the construction of concrete channels affect streambed complexity and in turn the biodiversity?When a section of the Arroyo Seco stream was tested, it was found to have an increased level of nitrates and phosphates. What may lead to an elevated level of nitrates and phosphates? What impact may it have on the organisms that live there? Discuss the impact on at least two trophic levels.Name a pollutant that is found at the Arroyo Seco Watershed. List at least two potential sources of this pollutant. How might bioremediation be used to remove this pollutant? (Although you were not given the handouts used in class, try to use the Internet to help you answer this question. You don’t need to provide a specific example of bioremediation.)