Hopkins Marine Station Student Paper

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(full paper is archived in the Miller Library)

Title: Distribution, reproduction, recruitment, and pigments of the stalked barnacle Pollicipes polymerus in the vicinity of sewage outfalls at Pacific Grove and Carmel, California
Student Author(s): Holstrom, Marshall V.
Faculty Advisor(s): Abbott, Donald P
Pages: 25
Location: Final Papers Biology 175H
Date: June 1970
Keywords: sewage pollution
Abstract: 1. In the period 29 April to 27 May 1970 studies of the distribution, reproduction, recruitment, and pigments of Pollicicpes polymerus were carried out on populations in both polluted and unpolluted areas. 2. Near sewage outfalls Pollicipes clusters may be abundant; however, they lack associated biota of polychaetes, amphipods, limpets and epizoic algae. The are loosely attached ot rocks and are ususally covered with an algal slime. 3. Within a 230 foot radius of an outfall with high residual chlorine the barnacles were not reproducing. Recruitment occurred only on the outer fringes of the area. At a second outfalll with lower residual chlorine a few Pollicipes were reproducing and some recruitment was occurring within four feet of the mouth of the pipe. The levels of reproduction and recruitment here were lower than in unpolluted areas. 4. Pollicipes shows decreasing damage with increasing distance form the outfalls. 5. Thin layer chromatogram studies show that several carotinoid pigments found int he stalk hemolymph of nermal Pollicipes are lacking in individuals living near sewer outfalls. 6. Pollicipes appears to have some value as a quantitative indicator of the effects of marine sewage pollution.