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Student activities Activity 4 Ecosystems investigations The investigation listed are good starting points for students to become familiar with their local communities and how wetland ecosystems coexist with urban ecosystems. • The following are some tasks that could be What are the impacts of introduced species to the wetlands (i.e. feral fish, foxes, ducks, weeds)? undertaken as a research assignment, poster activity, powerpoint, report or class presentation in groups or • individually by students. Investigate the impact of algal blooms on the health of the lake system, and describe how This activity uses Herdsman Lake located in the Perth humans have contributed to this environmental area to use as a research activity, however students issue. Mention of our connection to gardens which may wish to use a local wetland area. are popular in England would be useful. • • Understand food chains of wetland ecosystems • an issue as the soils become more exposed). Look at the food pyramid at Herdsman Lake, and discuss how the area of the lake influences its Managing a Wetland biodiversity. • • Investigate the seasonal variations of water levels Find out who is responsible for managing the lake, and describe the roles of the following parties: at Herdsman Lake. Has climate change affected Department of Water; Department of Environment the lake; and if so, describe these impacts in terms and Conservation; Local Government; local of their social and environmental effects. (see community groups and individuals. Management Plan) • Impacts of acid sulphate soils (soils produce lots of acid – as water levels go down it becomes more of by visiting a wetland area. • How have the water levels been affected by Conduct a short investigation into the lakes along our coast which make up the ‘Chain of Diamonds’ urbanisation (e.g. stormwater drainage, urban series of lakes. development surrounding the lake). How does urbanisation affect the Swamp harrier at Herdsman Lake? Food web at Herdsman Lake Shoveller Water boatmen Heron Fish Scuds Caterpillars Tiger snake Frogs Harrier Water weeds Snails Fish Diving beetles Swans SUN Bulrush Coots Egret Ducks Waterfleas Swamphen Worms 2693-0815 Dragonfly nymphs © watercorporation.com.au/teachers Goby Lawn Flies Swallows/martins Cormorant Pelican Little Falcon