EPA Science Inventory

Status of the amphipod Diporeia Spp. in Lake Superior, 2011

Citation:

Scharold, J., J. Kelly, AND T. Corry. Status of the amphipod Diporeia Spp. in Lake Superior, 2011. Presented at Joint Aquatic Sciences Meeting, Portland, OR, May 18 - 23, 2014.

Description:

Amphipods of the genus Diporeia have historically been the dominant benthic macroinvertebrates in deeper waters of the Laurentian Great Lakes. Although Diporeia populations in the lower Great Lakes have experienced severe declines in recent years, densities have remained relatively stable in Lake Superior. We used a probability survey design to assess population density of Diporeia in Lake Superior. During September 2011, Diporeia were sampled at 53 sites using a Ponar grab. 24 sites were in the nearshore (0-100 m depth) stratum and 29 in the offshore (>100 m) stratum. The lake-wide mean density of Diporeia was 855 + 146 (SE) m-2. In nearshore and offshore regions, mean densities were 1482 + 184 m-2 and 688 + 180 m-2, respectively. These values are greater than those from a similar survey conducted in 2006 (lake-wide mean 446 + 63m-2), and are much higher than those reported from the only previous comprehensive lake-wide survey of Diporeia, conducted in 1973. Greater understanding of the spatial and temporal variability of Diporeia populations will assist further refinement of monitoring designs.

Purpose/Objective:

not applicable

URLs/Downloads:

ABSTRACT.PDF   (PDF,NA pp, 129.729 KB,  about PDF)

Record Details:

Record Type: DOCUMENT (PRESENTATION/POSTER)
Completion Date: 05/28/2014
Record Last Revised: 05/28/2014
Record Created: 05/28/2014
Record Released: 05/28/2014
OMB Category: Other
Record ID: 277026

Organization:

U.S. ENVIRONMENTAL PROTECTION AGENCY

OFFICE OF RESEARCH AND DEVELOPMENT

NATIONAL HEALTH AND ENVIRONMENTAL EFFECTS RESEARCH LAB

MID-CONTINENT ECOLOGY DIVISION