The Darling Downs NATURALIST
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The Darling Downs POSTAGE SURFACE NATURALIST PAID MAIL Popularising and encouraging the study of natural AUSTRALIA history on the Darling Downs and fostering the conservation of fauna and flora in the area. http://toowoombafieldnaturalists.blogspot.com/ If undeliverable return to: Toowoomba Field Naturalist Club P.O. Box 133 Toowoomba Qld 4350 The deadline for the next newsletter will be Friday 21 April Newsletter No. 717 April 2017 CLUB ACTIVITIES CLUB MEETING: Friday 07 April at 7.00pm at St. Anthony’s Community Centre, Memory Street, Toowoomba. Rob Capon will speak on “Cane Toad Challenge”. Rob is a Professorial Research Fellow and Group Leader at the University of Queensland, Institute for Molecular Bioscience. This presentation provides a brief account of the discovery, development and science behind an innovative cane toad/tadpole trapping technology that uses a natural toad pheromone to lure toad tadpoles into a trap. It also provides an account of the Cane Toad Challenge, a community engagement and citizen science initiative dedicated to making this technology freely available to the public, as well as volunteer and community groups, businesses, and local, state and federal government agencies. CLUB OUTINGS: April Outing: No outing – annual camp later in the month. Chinchilla Camp: Wednesday 19 - Sunday 23 April. Accommodation is at Chinchilla Tourist Park, 264 Zeller St. We have 10% group discount, but these figures are my calculation, so are indicative only: Double Cabin @ $98 per night; Twin Share Cabin @ $116 per night; Powered sites @ $31-50 per night; Unpowered sites are available. [NOTE: Cabins can take an extra single for $31-50, which will reduce your pro rata cabin costs further.] Currently, I have cabins booked for Russells, McKilligans, Shirley and Sandy, Hodgkinsons and Gardiners; powered sites for Gundrys, Glenda and Stevensons (maybe); unpowered site for Allens. The programme should approximately as follows: Wednesday 19 April – Arrive and settle. Thursday 20 April – Gurrulmundi road trip, all day. Friday 21 April – Nangram lagoon, near Condamine, short day. Chinchilla FNC meeting night, with meal. Saturday 22 April – Barrakula road trip, all day. Sunday 23 April – Local interest around Chinchilla, short day. Evening meal to share. More details at April meeting. Ben Gundry 0407 463558 SUPPER ROSTER Please bring milk and include some Vegetarian and Gluten Free items. Please notify A. Evans (46385991) if unable to do. April. Cheryl & Phil Haxen May. Glenda Walter ___________________________________________________________________________________________________________ TFNC Newsletter 717 Page 1 SPEAKER’S REPORT: Pink-eared Duck, Black-tailed Water Hen and the Golden Goose (by Linda Mangubhai) Last year it came to our notice that there is a bird habitat in ‘our backyard’. At the March meeting of the Club Michael Atzeni spoke on the ‘Wyreema Wetlands’ and entitled his talk ‘Saving the Council’s golden goose’. The ‘Wyreema Wetlands’ has been known for the past 20 years as the sewage treatment area for Wyreema and Cambooya. With the amalgamation of the shires, this sewage treatment area is to be decommissioned and all waste directed, eventually, to Wetalla. Decommissioning, by law, requires the Toowoomba Regional Council (TRC) to return the area to what it was before it became a sewage treatment plant. That is, all possible contam- inants must be removed. This includes the sludge at the bottom of the small ponds which could contain biohazardous chemicals. It was pointed out that since the waste was coming from a small population and there are no hospitals or industries in Cambooya, pollutants could be small in number. The argument that the sludge was harmful to bird life was dismissed as birds seem to flock to sewage treatment plants, as many in the audience could testify! The 320 acres, with its ephemeral ponds, storm-water dam, surrounding grasslands and stands of taller native vegetation, is home to 95 (and growing) species of birds of which 30 are rare and 5 are ‘firsts’ for the Toowoo- mba region. It was the sighting of the pink-eared duck which first alerted Michael to the importance of this area as a potential wetlands habitat. Currently the small ponds are drying out as no water is entering them. There is water in the large primary pond which is the deepest and this is used by a very large number of ducks. Only the previous week the Eastern Rosella, the Boobook Owl and the Yellow-throated Myna were seen. The keen eyes of young Blade Preston have been an asset in recording the species. The area around the ponds is predominantly grassland. The Austral Cornflower (Rhaponticum australe) is growing well there (though classed as ‘vulnerable’) and three other vulnerable species of plants have been documented. It is hoped that the vision of having a sustainable and biodiverse wetlands habitat at Wyreema will be achieved and that a wildlife sanctuary can be created as the centrepiece of a unique local recreational space. How to achieve this? First, the area has to be secured as a wetland ecosystem. Second, a secure water supply is needed along with secure land tenure. It is hoped that the Department of Parks & Gardens of the TRC would oversee the development of this ecotourism site (similar to the TYTO wetlands near Ingham which receives some 21 000 visitors per year and generates a large income for Ingham). Michael hopes that a management committee can be put in place, linking up the local Wyreema community, wildlife conservation groups, research institutes, the Queensland Government and local schools. (Wyreema primary school is already involved.) There is a great need for baseline data on water quality and also for wild- life surveys. At this point in time, TRC should not proceed with the filling of the ponds and water supply needs to be increased. The area needs to be redesigned to optimise stormwater run-off, storage and minimisation of seepage. Michael has presented his case for the establishment of the ‘Wyreema Wetlands’ to the TRC and has received some support from some Council members. There is still a long journey ahead. Visit wyreemawetands.blogspot.com.au for some wonderful photos of the flying visitors to the Wetlands. OUTING REPORT - 05 March to Wyreema Wetlands (by Patricia Gardner) Our morning at Wyreema was an excellent follow-up to Mick Atzeni’s talk of Friday night. The whole project was much easier to conceptualise when we could see the true scale of it, and get a feel for the lie of the land. John Mills from Toowoomba Regional Council was kind enough to come and explain to us the ins and outs of sewage treatment generally, and what the changes in Toowoomba’s sewage management mean for the Wyree- ma wetland. It was particularly interesting to have him explain just why it was a good idea to pipe sewage all the way to Wetalla. Apparently Toowoomba previously had a poor record of letting too much nitrogen and phosphorus flow into the Murray-Darling river system, and was a major contributor to the serious problem of blue-green algae. Major changes to Wetalla’s processing method mean that we can now be proud of the clean water that we send down the river. John also brought up the subject of increased “hard-pan” – the increasing area of land under hard surfaces, such as buildings, roads, and driveways – which results in increased stormwater run-off. This will affect the wetlands site. The Wyreema plant still has a function. It receives the sewage from Wyreema and Cambooya, and sends it on to Wetalla, so a small corner of the site will continue to be involved in this. TRC’s decision is still to be made as to what can be done with the remaining area, which consists of a large area of open land, the old sewage ___________________________________________________________________________________________________________ TFNC Newsletter 717 Page 2 ponds, and the dam which now collects Wyreema’s stormwater run-off. The stormwater dam will continue to attract birds, but it is still to be decided to what extent TRC might feel able to support the restoration of the area to the high-quality wetland it was, when the sewage treatment ponds were in use. These shallower ponds provided excellent shallow-water feeding-ground for wading birds. We could also see that unlike the steeper-sided stormwater dam, they provided an excellent habitat for rushes and sedges, which in turn provided nesting sites and shelter for birds. Members discussed several issues with John, including the TRC’s perceived need to remove sludge from the ponds as part of the process of restoring the land to an acceptable state. John pointed out that sewage works are subject to requirements in this regard, similar to those for mines. Members queried the necessity of this, considering that birds had been using the habitat, without apparent harm, for 20 years. They also suggested that increasing the pond area, and therefore the seepage area, could be a way of contributing a local solution to the problem of reduced groundwater recharge because of rapidly increasing hard-surfacing of the land. As the increasing local difficulty of accessing bore water demonstrates, it may be that sending all that potential recharge water away downstream is not the happiest solution. Meanwhile, the birds would benefit from the resultant wetlands. Thank you to both John and Mick, for a morning which was both enjoyable, and left us feeling much better-informed about the Wyreema Wetlands issues. Visiting by Yourself. It is possible to look at the wetland’s birds from outside the fence at any time. This only gives a view of one of the ex-sewage ponds, but because it is shallow, it is the best for wading birds. The deeper stormwater dam can only be seen from inside the fence, but you can ONLY enter the precinct if you follow certain Toowoomba Regional Council requirements.