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| Title: | The effects of salinity increase on spring peeper tadpole (Pseudacris crucifer) growth and development in the Douglas Lake area |
| Authors: | Wu, Wei
Shaver, Ashley
Latta, Krista |
| Issue Date: | 2007 |
| Abstract: | The physiology of frogs makes them good indicators of their surrounding environment. Their permeable skin allows for absorption of needed solutes, but also makes them vulnerable to absorbing excess chloride as well. Industrial and human wastewater and salt run-off from roads during the winter in northern Lower Michigan is a concern for many freshwater environments. As chloride concentrations increase, frogs are unable to osmoregulate. The effect of increased salinity on the growth and development of spring peeper (Pseudacris crucifer) tadpoles in the Douglas Lake area was tested over the course of two weeks. It was hypothesized that increased salinity would osmotically stress the tadpoles and predicted that the increased salinity would decrease tadpole growth. Average tadpole growth ranged from 0.46 cm to 1.015 cm (p=0.851). It was concluded that salinity of 6 to 8 parts per million (parts per million of chloride will be referred to as ppm from here on) do not have an effect on spring peeper tadpole growth in northern Lower Michigan. An observational study of four Douglas Lake area ponds and marshes was also done. It was hypothesized that increased chloride levels would affect tadpole species richness and predicted that increased chloride levels will decrease the number of species present in the pond or marsh. Sedge Point pond had 1 ppm with 2 tadpole species; Grapevine Trail pond had 6.0 ppm with no tadpole species; Burt Lake area pond had 4.9 ppm with 1 tadpole species; and Cheboygan area marsh had 225.5 ppm with 3 tadpole species. No statistical tests were performed, but by observation it was concluded that salinity does not have an effect on Douglas Lake area tadpole species richness. Although we saw no difference in tadpole growth at 6, 7, and 8 ppm, further studies must be done to determine what chloride levels will begin to affect tadpole development. |
| Description: | General Ecology |
| URI: | http://hdl.handle.net/2027.42/57727 |
| Appears in Collections: | Biological Station, University of Michigan (UMBS)
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| Wu_Shaver_Latta_2007.pdf | | 39Kb | Adobe PDF | View/Open |
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