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Science 24 June 1983:
Vol. 220. no. 4604, pp. 1404 - 1407
DOI: 10.1126/science.220.4604.1404
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Articles

Reverse Diel Vertical Migration: An Escape from Invertebrate Predators

MARK D. OHMAN 1, BRUCE W. FROST 1, and EDWARD B. COHEN 2

1 School of Oceanography, University of Washington, Seattle 98195
2 Northeast Fisheries Center, Woods Hole, Massachusetts 02543

The marine copepod Pseudocalanus sp. exhibits an unusual reverse diel vertical migration in Dabob Bay, Washington, concurrently with a normal vertical migration by nocturnal invertebrate predators. Reduced spatial overlap with predators appears to decrease mortality rate of adult female Pseudocalanus. A life table analysis suggests that the demographic disadvantage associated with daily migration across a thermal gradient can be overcome if mortality is reduced by as little as 16 percent.

Submitted on August 19, 1982
Revised on March 14, 1983


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