The five major ponds and six streams on the island are discussed in this review. All of the freshwater habitats are governed by the weather, with several drying up during prolonged drought periods and many temporary pools and steams appearing after periods of intense rainfall. The flora and macroinvertebrate fauna is fairly typical of acidic waters on the mainland, and there appear to be no endemic species present.
Research on the largest body of standing water, Pondsbury, has shown a remarkable stability in the composition of the flora and fauna over the last fourteen years, in spite of the periodic dredging and drought that have occurred. The ponds and streams do display interesting differences which can be related to factors such as position and amount of decaying material present and algal differences in their flora and fauna and these exposure, water chemistry, vegetation cover, blooms.