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Semelhante a Investigation into the existence of Thermal Sensory Capabilities of Dung Beetles
Semelhante a Investigation into the existence of Thermal Sensory Capabilities of Dung Beetles (20)
Investigation into the existence of Thermal Sensory Capabilities of Dung Beetles
- 1. LSM3251 ECOLOGY PROJECT Group 2B: Choo Wan Yee Jordan Michael Senia Yoon Hui Lian
- 4. Dung beetle species in Pulau Ubin Horns on head of male Pronotum colouration Distinctive reddish pronotum Underside of legs is yellowish Underside of legs is brownish Onthophagus babirussoides Onthophagus leusermontis Onthophagus semicupreus
- 5. Catharsius molossus Large -bodied!
- 8. Receptors in dung beetles 2. Visual receptors 1. Olfactory receptors Polarized light 3. Infrared receptors ?
- 12. Sampling Site Pulau Ubin
- 13. The Team
- 16. Wild Boar Dung Trap Site
- 19. Trench-digging
- 20. Empty Trap
- 22. Insulation
- 23. Prepared Control
- 24. Heat Packs
- 26. Treatment in Place Under Topsoil
- 27. 1 m
- 28. Thermal Images Treatment Control
- 29. Obtaining Data
- 35. Limitations & Improvements
- 41. Challenges Rocky terrain Sweat… … and blood Exhaustion after the fieldtrip
- 42. What we gained Knowledge of dung beetles Knowledge of other organisms Knowledge of nature
- 43. Teamwork Treat
- 44. Q & A
Notas do Editor
- FOOD: Dung beetle larvae feed on undigested plant matter Adults feed on the liquid matter inside dung, sucking up unfortunate invertebrates
- Dung beetles belong to the order coleoptera, or more commonly known as Beetles. So they also follow their anatomy more or less.
- Catharsius molossus – large-bodied, common throughout SEA Onthophagus babirussoides – horns on male’s head, pronotum colouration, underside of legs is yellowish Onthophagus leusermontis – underside of legs is brownish Onthophagus semicupreus – distinctive red pronotum
- Catharsius molossus Pic of babirussoides for comparison
- Tunnelling behaviour aerates soil -> improves soil structure Nutrient recycling –> burying and consuming dung Seed dispersal - Secondary seed dispersers by burying seeds in dung. This reduces the chance of rodents removing the seeds. Controlling of pest populations – fly pests in australia populations decline w the reintroduction of dung beetles tt eat their eggs. (ABC news article) impact on hygiene, tourism
- Talk abt foraging behavior then nesting behavior Dwellers neither tunnel or roll
- Now, we ask ourselves, how do these beetles know where dung is located within the huge expanse of territory they live in? Many beetles depend on chemical cues and it is known that there are 2 sets of olfactory organs, one for long and one for short distances. They also have visual receptors. It is known that the ability to see polarized light helps in straight line ball-rolling behaviour. However, the ability to detect infrared heat is not known in dung beetles.
- Jewel beetle Melanophila acuminata Can talk abt the advantages of having heat sensory rather than just depending on olfactory receptors.
- Beetles are constantly spending precious energy searching out food in the absence of any clear sense of direction. Since other invertebrates have thermoreceptors, it may be possible that these exist in dung beetles as well.
- `
- Effect of variable in question (heat packs) on data set Treatment and control subject to same confounding variables so calculate test statistic simultaneously Looking for positive difference between treatment and control (more beetles) rather than general difference (more or less) so used one-tailed test
- Give examples of confounding variables
- Might be better to illustrate w graphs with SE bars after this slide, to show e large SE. (wy) 5% confidence level- there is a 95% chance that the variation that was observed was not statistically significant Note: Similar tests on abundance of individual species of beetles also failed to reject null hypothesis.
- We did not monitor the temperature changes over the 24 hr period. So we dunno the
- Improvements: more sample sites to reflect the variation in landscapes and ecology through out the island. (larger n) etc.
- Gained: knowledge about dung beetles and their ecological importance Learnt abt teamwork Free lunch!