Science Inventory

Trophic Structure Over the Northern Mid-Atlantic Ridge: The Bathypelagic Zone Really Matters

Citation:

SUTTON, T. T., J. HOFFMAN, J. KIDWELL, T. FAULKENHAUG, AND O. A. BERGSTAD. Trophic Structure Over the Northern Mid-Atlantic Ridge: The Bathypelagic Zone Really Matters. Presented at 2010 Ocean Sciences Meeting, Portland, OR, February 22 - 26, 2010.

Impact/Purpose:

We present preliminary results and ongoing efforts to characterize the trophic structure and energy flow of the pelagic ecosystems of the northern Mid-Atlantic Ridge (MAR), from Iceland to the Azores.

Description:

We present preliminary results and ongoing efforts to characterize the trophic structure and energy flow of the pelagic ecosystems of the northern Mid-Atlantic Ridge (MAR), from Iceland to the Azores. This study is one component of the international CoML field project MAR-ECO (www.mar-eco.no). We found a diverse deep-pelagic fish fauna (205 spp.), with unexpectedly high bathypelagic fish biomass and spatial complexity. Based on literature reports of species present, crustacean planktivory is the dominant trophic guild (79% of individuals 47% of species), primarily within the mesopelagial. “Gelativory” was second (12% ind., 4% spp.), primarily within the bathypelagial. Omnivory (3%, 13%), “shrimpivory” (2%, 4%), and piscivory (1%, 21%) were the remaining major feeding guilds. The diets of 22 spp., primarily bathypelagic, are unknown. A spatially explicit food web model revealed that of 12 fish assemblages discriminated by multivariate analysis, only three accounted for more than 4% of total fish consumption. The most striking finding was that along much of the MAR, fish consumption in the bathypelagic equals or exceeds the epi- and mesopelagic. Further, “alternate” trophic pathways (gelatinous zooplankton and shrimp consumption) appear to me major energy vectors in the deep North Atlantic.

URLs/Downloads:

5256HOFFMAN.PDF   (PDF,NA pp, 13 KB,  about PDF)

Record Details:

Record Type: DOCUMENT (PRESENTATION/ABSTRACT)
Product Published Date: 02/22/2010
Record Last Revised: 03/15/2010
OMB Category: Other
Record ID: 216432

Organization:

U.S. ENVIRONMENTAL PROTECTION AGENCY

OFFICE OF RESEARCH AND DEVELOPMENT

NATIONAL HEALTH AND ENVIRONMENTAL EFFECTS RESEARCH LABORATORY

MID-CONTINENT ECOLOGY DIVISION

ECOTOXICOLOGY ANALYSIS RESEARCH