SS3.15 Physical Forcing and Pelagic-Benthic Interactions in Aquatic Systems
Date: Thursday, June 13, 2002
Time: 11:15:00 AM
Location: Oak Bay
 
BoudriasMA, Marine & Environmental Studies, University of San Diego, 5998 Alcala Park, San Diego, CA, , USA, boum@sandiego.edu
Bolender, J, P, Chemistry Dept., University of San Diego, 5998 Alcala Park, San Diego, CA, USA, bolender@sandiego.edu
 
EFFECTS OF ORGANIC LOADING ON SANDY BEACHES IN BAHIA MAGDALENA II: MEIOFAUNAL COMMUNITY DIVERSITY
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The effluent from a fish cannery onto beaches in Bahia Magdalena, Baja California has led to eutrophication along the beach for a distance of at least 1 km south. We collected sediment cores at four sites along a gradient from the cannery to a distance of 6.5 km south and at a control site 6 km across the bay several times from January to June 2001. The pollution gradient is evident in the chemistry data, but diversity indices do not show any clear spatial pattern. Sites at the cannery and 400m south show reduced Shannon-Wiener and Simpson indices and a dominance by nematodes. Meiofaunal abundance is low though occasional patches show increased abundance and diversity. The site 6.5 km south, in the path of the effluent, shows highest H values (1.86) and the presence of amphipods and cumaceans not present at any other sites. The control site across the bay has low diversity and abundance, which may be correlated to the presence of stingrays. The meiofaunal community diversity is very patchy but does show some impacts from the cannery effluent.