WAMSI Node 1.1.3 - Rates of Ecological Processes (Kelp Production)

Primary productivity data (growth rates) was obtained for Ecklonia radiata growing in nineteen sites within and just outside Marmion Lagoon. In addition, benthic water temperatures (C) were also collected at each of the sites along with light intensity data (LUX). There were three sample periods of approximately 30 days in December/January, May/June and October/November 2009. Nineteen sites were chosen for the trial. Five sites were selected in deeper water outside the lagoon while eight sites were selected across the mid lagoon. The mid lagoon sites were chosen so as to provide an indication of the growth rates of E. radiata under a wide variety of different light conditions but similar temperature regimes. Six inshore sites were also selected, three of which were in a sheltered position while three were from a more exposed sites. The density of E. radiata at each of the sites was calculated by counting all sporophytes >2 cm in three 1 m2 quadrates, haphazardly placed within an 8 m radius of the stake marking each site. Light and temperature measurements were logged for each site using a Hobo TM light and temperature logger set to log these parameters every 10 minutes.