Hopkins Marine Station Student Paper

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(full paper is archived in the Miller Library)

Title: Effects of light intensity, temperature and salinity upon water colum distribution of Tigrious californicus
Student Author(s): Townsend, Hal
Faculty Advisor(s): Burnett, Robin
Pages: 49
Location: Final Papers Biology 175H
Date: June 1977
Keywords: high tide pools
Abstract: 1. A population of Tigriopus californicus in constant darkness, 15 C, and 34 ppt salt water will distribute themselves such that the majority of the animals are at the top and the bottom. Those nearest the bottom, with the exception of those resting on the bottom, have a higher activity than those animals higher in the water column. 2. The bulk of the population is somewhat homogenous in behavior in that ther appears to be few, if any, having distinct bottom-loving or top-loving tendencies. The majority seems to periodically move up and down. 3. There seems to be some intermediate light intensity, around 1600 LUX, causing density increase at the top of the water column. 4. The resting metabolism of a Tigriopus poulation over the temperatures of a naturally occurring tidepool seems to be temperature independent. 5. An actual preference to a salinity lower than sea water, about 18 ppt., seems to be apparent in an animal population.