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Hannides, A. K., Dept. of Fisheries and Marine Research, Nicosia, Cyprus, hannides@gmail.com
Smith, C. R., University of Hawaii at Manoa, Honolulu, USA,

LARGE ORGANIC FALL PROCESSING BY DEEP SEA COMMUNITIES AND THE GENERATION OF BIOGENIC REDUCING HABITATS – A MODELING EFFORT

Large organic falls (LOF) consist of massive packages of organic matter (e.g., whale and wood falls) that reach the seafloor and cannot be ingested whole by benthic infauna or epifauna. Our presentation describes the anatomy of a LOF-processing model by deep sea floor communities. The proposed model incorporates two of the three stages of processing: (a) the fragmentation, ingestion, and digestive processing of LOF organic matter by benthopelagic metazoa, and (b) the dispersal of fragmented material to the sea floor sedimentary microbial communities. Two specific falls from the California Borderland Basins region are used as case studies to develop the proposed modeling concept. The availability of field data from the case studies regarding the characteristics of the falls, processing rates, and impact of fall processing on monitored parameters permitted the assessment of the model output. We discuss how linking this model output to multi-component reaction transport models allows the study of the development of biogenic reducing habitats as a result of the third and final stage of LOF processing: (c) the sedimentary microbial processing of LOF-derived organic matter.

Session #:032
Date: 01-28-09
Time: 17:45

Presentation is given by student: No