June 2014 Issue
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THE FROG AND TADPOLE STUDY GROUP NSW Inc. Facebook: https://www.facebook.com/groups/FATSNSW/ Email: [email protected] NEWSLETTER No. 131 June 2014 PO Box 296 Rockdale NSW 2216 Frogwatch Helpline 0419 249 728 Website: www.fats.org.au Giant River Frog Limnonectes leporinus Borneo ABN: 34 282 154 794 Photo by Ken Grifftins Arrive 6.30 pm for a 7pm start. Friday 6th June FATS meet at the Education Centre, Bicentennial Pk, Sydney Olympic Park Easy walk from Concord West railway station and straight down Victoria Ave. By car: Enter from Australia Ave at the Bicentennial Park main entrance, turn off to the right and drive through the park. It is a one way road. Or enter from Bennelong Road / Parkway. It is a short stretch of two way road. Park in p10f car park, the last car park before the exit gate. th CONTENTS PAGE MEETING FORMAT Friday 6 June 2014 Last meeting – main speakers: 6.30 pm There are lost frogs (Litoria caerulea, Lt. infrafrenata Cameron Webb and Arthur White 2 and Lt. gracilenta) needing forever homes available to FATS Cane Toads by Nigel Turvey 4 financial members. Please bring your FATS membership card Travels with FATS 5, 10 & 12 and cash $40 - $50 donation. Your current NSW NPWS Smiths Lake field trip amphibian licence must be sighted on the night. Rescued frogs Michelle Toms and Hannah D’eau 6 & 7 can never be released. Sorry we have no EFTPOS at meetings. FATS AGM in August 2014 8 Please contact Monica before the meeting to confirm your Facebook friends interest in adopting a rescued frog. FATS on Facebook 8, 9 & 10 7.00pm Welcome and announcements. Amphibian licences and fauna returns 8 7.45 pm Main speaker: Dr Robert Johnson Public comment on chytrid "The metamorphosis of the amphibian vet". sought by Fed. Govt. Marion Anstis Galapagos and Amazon trips. Potential Chytrid cure for captive frogs 9 9.00 pm Show us your frog images, tell us about your frogging FATS information and contacts 11 trips or experiences, guessing competition, continue with frog adoptions, supper & a chance to relax and chat with frog experts. P1 Frogcall 131 June 2014 and use the gas (often in the form of dry ice) in traps used for mosquito-borne disease surveillance. Beyond the carbon dioxide we exhale, it is the chemical cocktail of compounds and microbes on our skin that determines where they bite. There are over 300 compounds on our skin purported to either attract or repel mosquitoes. Perhaps if these compounds could be isolated, identified and synthesised, we could develop better repellents or more effective chemical lures for traps. Are mosquitoes really a health hazard? Few would dispute that mozzies are a nuisance but they can do more than disrupt a backyard BBQ. There are around 5,000 cases of disease caused by Ross River virus or Barmah Forest virus every year The saltmarsh mosquito Aedes vigilax is one of the most across Australia. Yes, even Tasmania. The “flu- common nuisance-biting mosquitoes in Australia. Although it like” illnesses these viruses cause typically include is found in coastal estuarine wetlands, it can fly many kms symptoms such as rash, fever, headache, fatigue from wetlands into nearby areas. Photo Dr Stephen Doggett and arthritic pain. The symptoms are variable in their severity. Sometimes mild but also potentially HOW CAN YOU TAKE THE BITE OUT OF FROGGING? significant and result in many weeks or even t doesn’t matter if you’re packing for the next FATS field months of illness. Itrip or just heading out for an evening stroll, if you’re outdoors in summer, chances are mozzies are too! There are about 300 different mosquitoes in Australia. Each species is closely associated with particular habitats, from coastal rock pools to alpine snow melt ponds and from backyard bird baths to inland floodplains. There is even a group of mosquitoes in Australia that forgo a blood meal from humans to feed on frogs! But for those that do have a taste for humans, how can you best avoid mosquitoes and the pathogens they may transmit? Kooragang Island March 2014 These wetlands may look nice as the sun is setting but soon the mozzies will be out in force! Coastal swamp forests are home to many different nuisance-biting mosquitoes. It is ironic that the extracts from some of the plants found here, like tea-trees, are used as mosquito repellents. Mosquitoes don’t emerge from wetlands infected with these viruses, they must bite an animal first and become infected before they can spread the pathogen to humans. It isn’t just any animal though. The most important hosts for these viruses are kangaroos and wallabies. This means that regardless of how many mosquitoes are about, unless you’ve got macropods in the local area too, the risks of mosquito-borne disease are low. If you’re out chasing frogs in wetlands around urban Why do mosquitoes bite? It is only the female mosquito that areas, the risks may be low but as soon as you’re bites. She needs the nutritional hit in a blood meal to develop her out of the city, be aware that the risks increase. eggs. Mosquitoes can survive on plant juices alone but most of them need blood to develop eggs. Mosquitoes can bite a wide How do we best prevent mosquito bites? There range of animals, from frogs to birds, to kangaroos to people. are a number of ways you can prevent mosquito bites. Use of insect repellents/insecticides (e.g. There is a complex processes that determines why one person is topical repellents, mosquito coils), behavioural more likely to be bitten by a mosquito than another. The science practices (e.g. avoiding areas of times of the day behind mosquito biting preferences is slowly being unravelled but when mosquitoes are most active) and physical it is well known that carbon dioxide we exhale is the main barriers (e.g. bed nets, wearing long sleeved shirts) attractant. Mosquito researchers actually use this to their advantage will all prevent, or at least assist in preventing P2 Frogcall 131 June 2014 mosquito bites. For most people, the first line of defence against If you have a preference for these formulations, it mosquitoes is a topical insect repellent. Do you know how to is important to remember that they must be choose and use repellents correctly? reapplied more frequently to provide the same level of protection. Whether you’re using a “chemical” or plant-based repellent, it is important to remember that to get the best protection; they should be applied like sunscreen, not perfume! An even thin covering of all areas of exposed skin is recommended. For this reason, I prefer lotions or “pump sprays” and always ensure I apply the product to my hands first and then rub into skin. There is not much point to spraying products onto clothing, that alone won’t stop many bites. If you are planning your next field trip, I hope you keep a couple of these things in mind and pack some suitable insect repellents. Better to come home with some great memories and photos than a dose of Ross River fever! All products purporting to repel mosquitoes must be approved by the Australian Pesticides and Veterinary Medicines Authority (APVMA) who make an assessment on the effectiveness and safety of the products. The most effective repellents widely available in Australia are DEET and picaridin. These chemicals are found in most of the insect repellents you’ll find in the local supermarket, pharmacy or camping store. There is often a misconception regarding the safety of these products. However, despite the millions of people across the world who use these repellent, very few adverse health impacts are reported if the products are used as recommended. Most problems occur if you get repellent in your eyes, you swallow it or use them excessively on young children. Dr Cameron Webb Department of Medical It is important to note what the “strength” of the repellent means Entomology Marie Bashir Institute of for mosquito bite prevention. Taking DEET as an example, Infectious Diseases and Biosecurity, University increases in the concentration of DEET increases the duration of of Sydney and Westmead Hospital, Level 3 protection, not the amount of mosquitoes kept at bay. This means ICPMR, Westmead, NSW, 2145, Australia than for only an hour or so, a “low dose” repellent (approximately Email: [email protected] 10% DEET) will provide the same level of protection as a “tropical Twitter: @mozziebites strength” repellent (perhaps up to 80% DEET). However, these LAST FATS MEETING 4 APRIL 2014 “tropical strength” repellents may last for many hours. athy Potter spoke about upcoming FATS Kevents and the recent public events we have attended. Punia Jeffery welcomed attendees. Karen White presented images and spoke about our last Smiths Lake field trip. Jilli Streit presented a entertaining video and images about her trip to Far North Queensland. Arthur White spoke about over winter habitat for frogs and variations, generating lots of questions at the end of his talk. ameron Webb was our main speaker. See Carticle above. Thank you to all the presenters. We are so lucky to have such a diverse group of professionals and enthusiasts Cup and Saucer Wetland willing to share their experiences and research with us. The meeting ended with tasty super, Plant based repellents, such as those containing Melaleuca, raffles and a chance to reflect on the topics of the Eucalyptus or other essential oils, will provide protection but only night.