Accession Number:

AD0742999

Title:

The Intensity of Influence of Certain Factors When Acting Together on the Population of the Cirripedial Barnacle Balanus Improvisus Darwin,

Descriptive Note:

Corporate Author:

DEFENCE RESEARCH INFORMATION CENTRE ORPINGTON (ENGLAND)

Report Date:

1972-05-01

Pagination or Media Count:

11.0

Abstract:

A study was carried out to determine the effect of food, freshening of the water, the presence of the homobranchial Tenellia adspersa Nordmann, and industrial effluent on the numbers of young and the biomass of Balanus improvisus. When other factors were absent, the experiments showed that industrial effluent reduced the numbers of young 50 times, and the biomass 12 times food increased the biomass 3.5 times while Tenellia increased the numbers of young 1.5 times. When two or more factors were acting together, the effect changed. The overwhelming influence of effluent on the biomass weakened when freshening of the water took place and when food was added the influence of food and fresh water became greater when industrial effluent was present. The effect of Tenellia on the numbers of young in seawater was positive, but when industrial effluent was added it was negative. Author

Subject Categories:

  • Biological Oceanography
  • Water Pollution and Control

Distribution Statement:

APPROVED FOR PUBLIC RELEASE