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Full-Text Articles in Life Sciences

Trends In Mirex Concentration In Lake Ontario Salmonines And Sediments, Hilary L. Richardson Sep 2004

Trends In Mirex Concentration In Lake Ontario Salmonines And Sediments, Hilary L. Richardson

Environmental Science and Ecology Theses

Chinook (Oncorhynchus kisutch) and coho (0. tshawytscha) salmon and sediment cores collected from Lake Ontario during the summer and fall of 2003 were subsequently analyzed for mirex and photomirex. Mirex in fish tissue ranged from 0.011 mg/kg to 0.094 mg/kg (mean 0.048 mg/kg). Photomirex in fish ranged from 0.005 mg/kg to 0.045 mg/kg (mean 0.020 mg/kg). Analysis of variance (ANOVA) was performed to test for differences between mirex concentrations among all sampling years. A significant difference occurred between all sampling years (p=0.000). Temporal trends ...


Corridors And Some Ecological And Evolutionary Consequences Of Connectivity , John Lee Orrock Ii Jan 2004

Corridors And Some Ecological And Evolutionary Consequences Of Connectivity , John Lee Orrock Ii

Retrospective Theses and Dissertations

By connecting disjunct patches, corridors may offset the effects of fragmentation by promoting gene flow and population persistence. However, the ultimate effect of corridors on a focal species may hinge upon two considerations: how corridors may affect ecological interactions that impinge upon that species, and how corridors might affect the fixation of novel alleles that ultimately determine fitness and persistence. Using an experimental landscape, I show that corridor-mediated changes in patch shape change seed predation in connected and unconnected patches, and shift the behavior, abundance, and distribution of seed predators. Rodent seed predators removed more seeds in connected patches, arthropod ...