1 / 18

Intan Krishanty Liu Shi Yang Joyce Huang Vera Soh Teacher supervisors: Dr Seah Wee Khee

Influence of weather changes on Nephila antipodiana and Nephila pilipes populations from Singapore. Intan Krishanty Liu Shi Yang Joyce Huang Vera Soh Teacher supervisors: Dr Seah Wee Khee Ms Madeline Chen NUS High School of Mathematics and Science. Climatic Changes.

anthea
Download Presentation

Intan Krishanty Liu Shi Yang Joyce Huang Vera Soh Teacher supervisors: Dr Seah Wee Khee

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Influence of weather changes on Nephila antipodiana and Nephila pilipes populationsfrom Singapore Intan Krishanty Liu Shi Yang Joyce Huang Vera Soh Teacher supervisors: Dr Seah Wee Khee Ms Madeline Chen NUS High School of Mathematics and Science

  2. Climatic Changes

  3. Climatic Changes

  4. Ecological Niches • Population size depends on biotic and abiotic factors Biotic Factors:- Availability of prey- Parasitism- Competition- Plant health Abiotic Factors:- Light intensity- Temperature- Wind- Rainfall/ Humidity

  5. Climatic Changes • Minute climatic changes affect biodiversity • Individual plants and invertebrates as bioindicators (Bridgewater and Woodin, 1990)

  6. Nephila pilipes Nephila antipodiana

  7. Population Fluctuations • Possible alternating population booms • Changes in weather may act as proximate and ultimate cues • Change in population size may determine minute changes in weather

  8. Objective • To establish how and which specific weather condition affects population dynamics in Nephila antipodiana and N. pilipes • Hypothesis: Changes in abiotic factors will alter biotic factors, hence determine the viability of individual spider species

  9. Benefits of Research • Using spiders as bioindicators, we can examine their population dynamics as a model to understand minute changes in weather affecting the intricate ecological balances, and hence biodiversity

  10. Weather Parameter Focus • Amount of rainfall may be the main factor causing population changes • Maximum rainfall: December – April • Drier months: February – July • Increase in precipitation rate and humidity increases availability of specific spider preys

  11. Methods • Weekly sampling of > 30 Nephila sp. individuals will be performed at Labrador Park

  12. Methods • Nephila and Argyrodes flavescens measurements • Host spider • Species • Length • Guests • Presence of male Nephila • Presence and number of A. flavescens

  13. Methods • Web dimensions • Height from ground • Hub diameter • Upper and lower radial length and spirals • Presence of barrier web • Data obtained above will serve to calculate • Capture area • Mesh size

  14. Possible Correlation • Weather conditions • Number of Nephila sp. observed • Population dynamics • Average lengths of N. pilipes and N. antipodiana • Approximation of Nephila age • Average web size • Approximation of Nephila age • Number of webs with the presence of Nephila male(s) • Approximation of reproductive stage of female Nephila • Number of kleptoparasites • Approximation of weather condition

  15. Impact Relative Biodiversity

  16. Limitations • Relocation of webs of experimental spiders • Small and localised study area • Time constraints

  17. Acknowledgements • Senoko • National Environmental Agency

More Related