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Effects of the insecticide dieldrin on benthic algae in laboratory streams

Creator:

Rose, Frederick Louis

Abstract:

The accumulation of dieldrin and its effects on species composition of benthic algal communities were studied in laboratory streams. Effects of dieldrin on photosynthetic and respiratory rates of the blue-green alga Phormidium retzii were determined using a Gilson Differential Respirometer. Dieldrin concentrations ranging from 0.05 to 7.0 ppb were maintained...

Resource Type:

Dissertation

Full Text:

Laboratory Streams AN ABSTRACT OF THE THESIS OF FREDERICK LOUIS ROSE JR. for the (Name) in BOTANY
Development of Douglas-fir seedling root architecture in response to localized nutrient supply

Creator:

Jacobs, Douglass Frederick, Rose, Robin, and Haase, Diane L.

Abstract:

Three months following sowing, Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) seedlings were transplanted into pots with controlled-release fertilizer (CRF) applied at rates of 0, 8, 16, and 24 g/2200 cm3 soil as a single uniform layer beneath the root system. Seedlings were destructively harvested periodically, and roots were divided into vertical...

Resource Type:

Article

Full Text:

to localized nutrient supply Douglass F. Jacobs, Robin Rose, and Diane L. Haase Abstract: Three