Academic journal article Michigan Academician

Zoology

Academic journal article Michigan Academician

Zoology

Article excerpt

The abstracts were edited by section leader David Clark.

Zooplankton Population Dynamics in a Small Dystrophic Lake. Brad Baughman

and Mark Oemke, Dept. of Biology, Alma College

Davis Lake is a bog dystrophic lake with an open water area of 2.2 acres. Monthly zooplankton samples were collected from May 2007 to April 2008 at the surface, 1.5 m, 3.0 m, and 4.5 m depths. Six taxa were found in abundance: two rotifers Kellicottia sp. and Keratella cochlearis, a cyclopoid copepod Tropocyclops sp., a cladoceran Bosmina longirostris, an Oligotrich protozoan, and the midge larva Chaoborus americanus. Kellicottia had the greatest summer density at 1.5 m, but were found deeper and more abundant during the winter (peaking at 850 individuals per liter in December). Chaoborus were first detected in July, and were at the highest concentration in August at 4.5 m. Tropocyclops, Bosmina, and Keratella had the greatest density at the surface, with maximum densities for Tropocyclops in September (500), Bosmina in May (680), and Keratella. in December (2,700). In a separate 24-hour study, Chaoborus exhibited distinct vertical migration. Our study revealed some previously unknown information regarding the composition and distributions of the zooplankton community in this bog-lake.

Light Habitat Variation and Reflectance Patterns of the Eastern Painted Turtle, Chrysemes picta. Brett Seymoure, David L. Clerk and John F. Rowe, Dept. of Biology, Alma College

Recent studies on the Midland painted turtle, Chrysemys picta, have demonstrated that variation, in habitat substrate background coloration can induce corresponding lighter or darker shell coloration. Additionally, laboratory studies have shown that an inducible melanization effect is reversible and that turtles can respond by changing color within 30 days of being placed against a light or dark background. The objectives of this study were to sample the irradiance spectra of the different aquatic habitats of C. picta on Beaver Island, Michigan. We sampled eight different locations; a) two marshes; b) two inland lakes; c) a duckweed swamp; d) a tannin swamp; e) a swamp juxtaposed to an inland lake; and f) Lake Michigan open water harbor. Irradiance profiles of the two inland lakes were similar to one another but distinct from the other habitats and this was also apparent with the two marshes, which overlapped, in spectral characteristics. The irradiance profiles of the three unique swamps and harbor sites were distinctly different. Additionally, light intensity at all sites, but the harbor and inland lakes decreased dramatically within 1.5 m of the water surface. Spectral profiles change as a function of depth and transmission quality of water at each site. Our goal is determine if there is a relationship between irradiance profiles and C. picta ground color reflectance patterns.

Use of Anthropogenic Structures and Prevalence of Road Mortality in Eastern Fox Snakes (Pantheraphis gloydi) on Harsens Island, Michigan. Alicia M. Selden and James C. Gillingham, Department of Biology, Central Michigan University

The exceedingly rapid expansion of the human population has had numerous adverse effects, both direct and indirect, on wildlife populations across the globe. One of the numerous species at risk as a consequence of anthropogenic disturbance is the Eastern Fox Snake, pantherophis gloydi. Many studies have found various snake species to frequently occur in or near areas occupied by humans and the Eastern Fox Snake is no exception. Although studies have found fox snakes to extensively use anthropogenic structures and residential areas, the details of how frequently they use them, and if this use varies seasonally, have not been examined. This study used radio-telemetry and daily road surveys from May-August 2008 to examine Eastern Fox Snake use of anthropogenic structures, such as grass clipping piles, refuse debris, and seawalls, on Harsens Island in St. …

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