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Macroinvertebrate Communities in Ephemeral Ponds: Effects of Competition, Landscape, and Hydroperiod on Species Richness Edmund Hart University of Vermont ESA 2007
What is an Ephemeral Pond? ,[object Object],[object Object],[object Object],[object Object]
Ponds Undergo Regular Drying
Common Ephemeral Pond Taxa
Community assembly ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Schematic of community structure.  .2 .4 .9 .6 .7 .1 .3 .2 .5 Hydroperiod .8 .3 .3 .1 .1 .5 .2 .1 .8 .9 .4 .6 .2 = Taxa that can  utilize ephemeral  habitat   = Taxa already present In habitat = Potential colonizer Model drawn after Schnieder and Frost (1996)
Study question Do competitive interactions with salamander larva  Or abiotic habitat variables determine invertebrate  species richness?
[object Object],[object Object],Study Location Delaware Water Gap National Recreation Area
Experimental Design ,[object Object],[object Object],[object Object],[object Object],[object Object]
Experimental Design ,[object Object],[object Object],[object Object],[object Object],[object Object]
Model Development and Analysis ,[object Object],[object Object],[object Object],[object Object],[object Object]
Since design was not fully crossed, a saturating likelihood  results when too many factors are added into the model.  Therefore interaction terms could not be considered, only  additive effects of two parameters. Candidate Models
Results Species Richness by Treatment
Results Individual based rarefaction curves generated by EstimateS  (Colwell 2005).  Open sites have higher species diversity.
The model with habitat and hydroperiod predictors best fits the data, also having the highest AICc weight and bootstrap frequency. Model Results
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Conclusions
Questions? Worms sure are  tastier than bugs Thanks DEWA staff, Rich Evans, USGS BRD Brian Beckage, Nick Gotelli

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Macroinvertebrate Communities in Ephemeral Ponds: Effects of Competition, Landscape, and Hydroperiod on Species Richness

  • 1. Macroinvertebrate Communities in Ephemeral Ponds: Effects of Competition, Landscape, and Hydroperiod on Species Richness Edmund Hart University of Vermont ESA 2007
  • 2.
  • 5.
  • 6. Schematic of community structure. .2 .4 .9 .6 .7 .1 .3 .2 .5 Hydroperiod .8 .3 .3 .1 .1 .5 .2 .1 .8 .9 .4 .6 .2 = Taxa that can utilize ephemeral habitat = Taxa already present In habitat = Potential colonizer Model drawn after Schnieder and Frost (1996)
  • 7. Study question Do competitive interactions with salamander larva Or abiotic habitat variables determine invertebrate species richness?
  • 8.
  • 9.
  • 10.
  • 11.
  • 12. Since design was not fully crossed, a saturating likelihood results when too many factors are added into the model. Therefore interaction terms could not be considered, only additive effects of two parameters. Candidate Models
  • 13. Results Species Richness by Treatment
  • 14. Results Individual based rarefaction curves generated by EstimateS (Colwell 2005). Open sites have higher species diversity.
  • 15. The model with habitat and hydroperiod predictors best fits the data, also having the highest AICc weight and bootstrap frequency. Model Results
  • 16.
  • 17. Questions? Worms sure are tastier than bugs Thanks DEWA staff, Rich Evans, USGS BRD Brian Beckage, Nick Gotelli