Factors influencing the distribution of Volvox spp. in 41 ponds of the Lake Itasca region, Minnesota, were investigated from May 25 through July 14, 1980. Twenty-two ponds had Volvox populations. The three species of Volvox found were: V. aureus Ehr., V. globator L. and V. tertius Meyer. Usually only one species was present in a pond with rare co-occurrence of two species. Only two of the 41 ponds contained two Volvox species simultaneously for a short time.Group comparison tests of ponds with and without Volvox showed three parameters to be significant (P > 0.05 level). Mean total phosphorus was higher in ponds with Volvox (x = 1.75 uM/1) than without (x = 0.95 uM/1). Mean temperature (20.4°C versus 21.8°C) and mean pH calculated from H+ concentrations (6.32 versus 6.76) were both lower in ponds with Volvox than in ponds without. Field observations of one pond revealed a patchy distribution of V. globator related to macrophyte abundance. Laboratory investigations confirmed that V. globator colonies orient to the aquatic moss Drepanocladus revolvens.Ball State UniversityMuncie, IN 47306
| Identifer | oai:union.ndltd.org:BSU/oai:cardinalscholar.bsu.edu:handle/182421 |
| Date | 03 June 2011 |
| Creators | White, Arthur J. |
| Contributors | Senft, W. Herbert |
| Source Sets | Ball State University |
| Detected Language | English |
| Format | viii, 68 leaves : ill. ; 28 cm. |
| Source | Virtual Press |
| Coverage | n-us-mn |
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