Presentation on theme: "The Effects of Light Cycle on Metamorphosis in Salamanders Kenn Rose 1,2 and Christopher K. Beachy 1 1 Department of Biology and 2 Department of Psychology,"— Presentation transcript:
The Effects of Light Cycle on Metamorphosis in Salamanders Kenn Rose 1,2 and Christopher K. Beachy 1 1 Department of Biology and 2 Department of Psychology, Minot State University, Minot ND
Background Environmental variables affect timing of metamorphosis (e.g. temperature, food availability, predator threat). Light and Photoperiod have far reaching effects in all facets of nature (flora and fauna). In the wild, pre-metamorphic Ambystoma tigrinum and A. maculatum are exposed to changing photoperiods.
The damselfly, Lestes viridis Rolff et al., 2004, American Naturalist
QUESTION ?? Will changing the length of photoperiod in pre-metamorphic tiger and spotted salamanders mimic environmental cues (seasonal change for example) and affect timing of metamorphosis?
HYPOTHESIS Manipulating exposure to constant and varying photoperiods in larval Ambystoma tigrinum and A. maculatum will affect timing of metamorphosis.
METHODS & PROCEDURE
Treatments (X4) L2S All Short All Long S2L
Lab Design DOOR Block 3 Block 1 Block 2
RESULTS Morphological traits
Morphology Pre-metamorphic Post-metamorphic
Metamorphic Timing All ShortS2LL2SAll Long Experiment 1
Mass at metamorphosis All ShortS2LL2SAll Long Experiment 1
Confounds to a degree?? Temperature variations were +1 ° between Long and Short photoperiods
Temp Effects From Hickerson et al., 2005, Southeastern Naturalist Desmognathus quadramaculatus Blackbelly salamander
Experiment 2 Methods
Metamorphic Timing All ShortS2LL2SAll Long Preliminary Results Experiment 2
Further Exploration Experimentation of species with extended larval periods (to include seasonal expanses). Exploration of effects of varying light wavelength on metamorphic timing. Variation in food amount
Acknowledgements Amphibian Growth Project team members Claude Ouedraogo Janel Richter Heidi Richter Drew Henry Karew Schumaker Department of Biology