Freshwater lake Ecosystem Report, with focus on infestations of salvinia weed. Risk Assessment also included.

Essay by Carly66High School, 10th gradeA, February 2013

download word file, 6 pages 0.0

Freshwater Ecosystem- Eli Lakes

The freshwater lakes located in the suburb of Eli Waters, Hervey Bay, is a lively ecosystem in which many organisms thrive. The main section of the lakes is in full sunlight and is approximately 450m in length, from one end to the other. Like all lake habitats, these freshwater lakes can be divided into four different zones; these include the littoral zone, limnetic zone, profundal zone, and benthic zone.

The organism that I have chosen to study in further detail is Salvinia molesta, otherwise known as the salvinia weed. Salvinia is a serious aquatic weed that is very adaptable to a number of different environmental factors. The weed can be described as a floating aquatic fern with slender stems, floating leaves, and a root-like structure. The distinctive leaves have a round-oval shape with dense waxy hairs on the upper surface. Salvinia weed is not only challenged by environmental factors, such as severe weather conditions, but also humans.

Due to the harmful effects that this weed can have on the environment, experts have been forced to produce methods of controlling the noxious weed. These methods have included the weevil, an ant-sized insect feed on the growing tips of the salvinia, and chemical herbicides.

Other organisms that live in this freshwater lake habitat have adapted to the habitat to help in their own survival. One of such adaptations includes the black swan adapting to feed on the roots of the salvinia weed, due to its abundance in the habitat.

Aim: To investigate the biotic and abiotic features of Eli Lakes and in particular, the distribution and abundance of a species.

Materials: • Sampling containers • Sampling bags • Small shovel • Data logger • Long, thin piece of string or rope • Large dowel or thin piece...