Accession Number : AD0713796

Title :   EXPERIMENTAL STUDY OF THE FOULING PROCESS AT SEA (Eksperimentalnoe Izuchenie Protsessa Obrastaniya v More),

Corporate Author : NAVAL INTELLIGENCE COMMAND ALEXANDRIA VA TRANSLATION DIV

Personal Author(s) : Dolgopolskaya,M. A.

Report Date : 28 OCT 1970

Pagination or Media Count : 23

Abstract : Data were gathered for a year on the quantity of organisms which settled monthly. The number of individual fouling organisms can vary monthly - from zero to 224,800 specimens per 1 sq m (barnacles), and from zero to 6,000 per 1 sq m (mussels). Increasing the settlement density up to a known limit stimulates the vital activity of the organisms, but when an optimum value is reached, it suppresses such activity. The total weight of organisms settling during a month per 1 sq m varies from a value less than 1 gram (winter) to 548 g (autumn: September). The total weight of fouling per year per 1 sq m of surface varies as a function of the month when it began; The sizes reached by the fouling organisms for the first month of attached life are a function of settlement and vary from 1 to 8 mm for barnacles and from 0.3 to 1.5 mm for mussels. The settling of larvae onto a new surface free from fouling is more intense than that onto a surface which is already occupied by other organisms. Subsequently, with the growth of the individual colonies there is both crowding out and fouling of some species by others. As a result of all this struggle, the dominant form becomes mussels, which form dense, solid sets restricting the further settlement of larvae. This must be explained by the continuous fouling of stationary objects purely by mussels. The quantity of fouling barnacles predominates on surfaces turned under.

Descriptors :   (*FOULING, *AQUATIC ANIMALS), (*MARINE BIOLOGY, FOULING), BARNACLES, PELECYPODA, GASTROPODA, MOLLUSCA, INVERTEBRATES, QUANTITATIVE ANALYSIS, DENSITY, OCEAN BOTTOM, EXPERIMENTAL DATA, ALGAE, PERIODIC VARIATIONS, LARVAE, LIFE CYCLES, ECOLOGY, USSR

Subject Categories : Biological Oceanography

Distribution Statement : APPROVED FOR PUBLIC RELEASE