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- Effects of mycorrhizal fungi on tree seedling growth: quantifying the parasitism-mutualism transition along a light gradient .
- Changes in heron and egret populations on the Laurentian Great Lakes and connecting channels, 1977-2009 .
- CO2 Fluxes at northern fens and bogs have opposite responses to inter-annual fluctuations in water table .
Stream edge desiccation: The effects of drought on algal communities and grazers in temperate streams
This experiment examines the effects of drought periods on algal communities in streams. This is motivated by a predicted decrease in streamflow for temperate latitudes, causing the edges of streams to dry out for long periods of time. Benthic algal communities are studied, with quantification of chlorophyll-a content (biomass) and phaeophytin (unproductive or dead cells), as well as characterization of dominant algae and diatom species present in the streams. Control streams experienced 0% drought while the other 3 treatments had droughts 2, 4 and 6 days in length, ocurring once a week. There were 4 replications of each treatment and samples were taken on Tuesdays, with the dry period cycle beginning on Tuesday afternoons and ending Monday afternoons. Following the sample taken to characterize initial growth in all streams, 4 more samples were taken. Mean chlorophyll-a and phaeophytin values are compared from week to week for each treatment to detect any positive or negative changes. Mean species/genera counts are also compared for each treatment.