Monitoring at Moon Moon:
diverse vegetation and poems about tiger snakes!
Author: Will Higgisson
Over the past six years of monitoring, the Lachlan selected area has had the greatest diversity of plants recorded of all seven selected areas across the Murray-Darling Basin with a whopping 359 species recorded. This is quite an achievement considering that the Lachlan receives a small fraction of the total volumes of environmental water used in the Basin. Most of the species we record in the Lachlan are native and consist of a diverse array of plants from different growth forms and functional groups.
We made this discovery when, following a wet summer in 2021, we headed out to do our autumn vegetation monitoring, happy to be back out in the field along the Lachlan River. Even after heavy rainfall and flooding earlier in the year, we found by mid-May many of our sites were dry. With these dry conditions in mind, we were surprised to find a range of native vegetation that normally only survives if flooding conditions still persisted.
Autumn vegetation monitoring during 2021 highlighted how it doesn’t take long in the lower Lachlan for conditions to dry off. The drier than average conditions experienced in April and May leading up to our surveys in mid-May, contrasted with the wet conditions experienced in most of 2020. Many of our plots had very low groundcover, with few annuals and primarily perennial saltbush species, which are accustomed to the drier conditions. This was in stark contrast to our spring surveys where the same plots supported much higher groundcover.
Despite some sites being dry, other monitoring plots were not, and it was great to see that the translucent flows that occurred in November 2020 were still making a lasting impression on parts of the floodplain. Some wetlands such as Moon Moon Swamp and Whealbah Lagoon were still holding water, covering over our monitoring plots or transects during our surveys. Surface water had recently receded at our plots on other wetlands such as Lake Bullogal, Lake Marool and Murrumbidgal Swamp.
At wetlands that flooded as a result of the translucent flows late last year, we had a range of native aquatic and amphibious plants recorded during our autumn survey. Most of these wetlands had not been flooded since wide-scale flooding in late 2016, so for these native aquatic and amphibious plants, this water is much needed. These interesting (typically) short-lived species make up the groundcover during and following flooding, and play a range of important roles in maintaining healthy floodplain-river ecosystems. These species have adapted to the highly variable conditions (often unpredictable wetting and drying cycles) by lying dormant in the soil seed bank during dry periods. They typically germinate, grow and reproduce rapidly when the conditions are right – which is typically during and following flooding events. While the seed of these species can remain viable over multi-year droughts, flooding is vital to maintain them in the landscape by providing the conditions to replenish the soil seed bank. As such these species are more common and in a greater abundance at our more regularly flooded sites.
After being inspired by a book of locally written bush poetry called Back Block Bards, he bought from Booligal Pub during the field trip, Matt Jeromson who was assisting us with our fieldwork campaign decided to write a poem about our experiences at Moon Moon Swamp – including our near miss with a tiger snake!
I thought I should share it, along with a watercolour Matt painted of Moon Moon Swamp.
The wetland was full, at that place called Moon Moon,
when we arrived with our truck and our notes.
To proper measure there, would have been a ghastly fare
but at least we saw a couple of goats.
We stopped and we looked, and we scrawled on a page
when we decided the Azolla would do.
But while wandering about, Becs screamed “A snake is out!”
and Alica jumped out of her shoes.
Featured Photo: Moon Moon Swamp . Photo credit: Alica Tschierschke.
The Lachlan River flows through the lands of the Nari Nari, Ngiyampaa, Waradjuri and Yita Yita Nations, forming part of Songlines and Dreaming tracks. It has provided food, shelter and resources to Aboriginal people for between 40,000 and 65,000 years. The Lachlan supports a diverse range of landscapes and species that vary enormously through extremes of weather conditions. Our work here is focusing on monitoring the outcomes of environmental water in the lower Lachlan river system, from Lake Brewster to the Great Cumbung Swamp.
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