Experimental streams constructed by the Weyerhaeuser Company,
Tacoma, Washington, at Kalama Springs, Washington, were used to observe
successional changes in the benthos. Community changes were observed
relative to experimental manipulations of light intensity and nitrate
concentration in two experiments. The development of benthic assemblages
was followed for 150 days after...
Effects of light intensity, exposure to desiccation, reduced
salinity, and thermal elevation on the functional and structural characteristics
of marine benthic diatom communities were investigated
in a laboratory model ecosystem and a respirometer chamber.
Measurements of biomass (dry weight and ash-free dry weight)
and chlorophyll a were made for each...
In situ light and dark planktonic and benthal respirometers were
used to measure the oxygen requirements of Yaquina estuary water
and benthal deposits. Respirometer devices were constructed so that
actual conditions of mixing could be simulated and benthal deposit
disturbance would be minimized.
A mathematical model of a benthal respirometer...
"The purpose of this report is to present methods and procedures for monitoring estuarine benthic systems. Emphasis is given to those features of benthic systems of significant ecological importance. While the experience of the authors has been within estuarine environments, the material contained herein is relevant to a wide range...
In comparison with solar radiation, the energy of geothermal
heat flowing through the sea bottom is extremely small; nevertheless,
this energy is not insignificant in the circulation of the bottom water.
Calculations indicate that in the deep basins of the South Atlantic the
water volume transport necessary to remove this...
The shallow water benthic habitat of the SW Beaufort Sea is frequently
gouged by the keels of ice pressure ridges. This natural physical
disturbance was hypothesized to be an important factor affecting the
structure of the benthic community. Smith-McIntyre grab samples were
taken from three discrete gouge axes and from...
"The general objective of research . . . was to determine mechanisms that control the production dynamics of benthic plants and associated epiphytes in Netarts Bay relative to physical processes and changing patterns of nutrient distribution. . ."
The goal of this study was to better understand stream communities through a perspective that might make their structure, organization, and development more understandable. This goal was approached
through the following objectives:
1. To determine the assemblages of stream organisms and define subsystems within a stream community.
2. To explain...
In the early 1980's the first evidence of biological alteration of basalt glass (sideromelane) was published. Since that time additional evidence, including DNA staining, isotopic abundance and chemical mapping, has come to light suggesting that this unique alteration of glass can be attributed to microbial activity. Microbial alteration textures have...