Daytime distribution of Pontoporeia affinis off bottom in Lake Michigan

Limnology and Oceanography



The vertical migration of the amphipod Pontoporeia affinis in Lake Michigan has been well documented by Wells, Marzolf, and McNaught and Hasler. Wells and Marzolf observed Pontoporeia off bottom only at night. McNaught and Hasler, however, found Pontoporeia above the bottom shortly after noon in a 24-hr study on 12 June 1965, and some individuals were taken just below the thermocline in all daylight hours in a similar study on 19-20 August. This paper presents evidence that Pontoporeia regularly were present above bottom during the day from April-August 1964. The data for this report were collected during a study of seasonal and depth distribution of larval bloaters (Coregonus hoyi) in Lake Michigan. Sampling was conducted from the U.S. Bureau of Commercial Fisheries RV Cisco off Saugatuck, Michigan, at intervals of about 10 days from 9 April to 14 August 1964. A few samples were taken on 22 August and 15 October.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Daytime distribution of Pontoporeia affinis off bottom in Lake Michigan
Series title Limnology and Oceanography
DOI 10.4319/lo.1968.13.4.0703
Volume 13
Issue 4
Year Published 1968
Language English
Publisher Wiley
Contributing office(s) Great Lakes Science Center
Description 3 p.
First page 703
Last page 705
Online Only (Y/N) N
Additional Online Files (Y/N) N
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