Journal reporting 161
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The document compares three techniques for sampling ant populations in tropical rainforests: fogging, baited pitfall traps, and purse-string traps. Fogging with pyrethrum insecticide collected the highest number of individuals (39,351 ants) and highest diversity (173 species, 38 genera). However, it greatly disturbs the ecosystem. Baited pitfall traps can sample throughout 24 hours but require longer deployment to catch sufficient ants. Purse-string traps sample small areas with high precision but not entire tree canopies. The conclusion is that fogging collects the most species but one must consider sampling time and trade-offs when choosing a technique.
Journal reporting 161
- 1. Presented by: Masa and Olivar Optimizing Diversity Assessment Protocols for High Canopy Ants in Tropical Rain Forest
- 2. Why Ants? Most abundant and ecologically important group Population decline affect the rates of ecosystem processes such as nutrient redistribution (Fayle et al. 2011)
- 3. Inquiry Which among the sampling techniques can give the highest number of ant individuals, number of species and species composition? 1. Fogging 2. Baited Pitfall Trap 3. Purse-String Trap
- 4. Segama Forest Reserve, Sabah, Malaysia Lowland Dipterocarp Forest
- 5. 1. Fogging Igeba TF 35 fogging machine with synthetic pyrethrum insecticide (active compound: Alphacypermethrin with synergist 2.27%) 10 fogging trays 10 min Carried out at 6 am Trays left for 3 hours
- 7. 2. Baited Pitfall Trap Attachment to Branch Mesh containing bait (Tuna and sweets) Water with Detergent
- 9. Results 0 10 20 30 40 50 60 70 80 90 100 Abundance Diversity Fogging Baited Pitfall Purse-String 39,351 ants 173 species 38 genera
- 10. Discussion SAMPLING TECHNIQUE ADVANTAGES DISADVANTAGES Fogging Most efficient Greatly disturbs the ecosystem Baited Pitfall Allows catching of species active throughout a 24-h period Run for longer periods of time to catch reasonable numbers of ants (caught are clumsy ants) Purse-String Trap Powerful method in collecting ants on very small spatial and temporal scales Does not allow the whole canopy of the tree to be sampled
- 11. Conclusion Fogging > Purse- string > Baited Pitfall in terms of species abundance and diversity Authors suggest that in choosing a sampling technique, one must first consider sampling time.
Editor's Notes
- Symbiosis with other organismsHost to parasitesTurn over soil nutrient cycling
- Started on ground
- 4 per tree24 hrs
- Left for 1 hr (night and day) 10001100 h and 19002000 h