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Mating and the Depth Distribution of an Oceanic Copepod

Thomas L. Hayward
Limnology and Oceanography
Vol. 26, No. 2 (Mar., 1981), pp. 374-377
Stable URL: http://www.jstor.org/stable/2835925
Page Count: 4
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Mating and the Depth Distribution of an Oceanic Copepod
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Abstract

Males of the calanoid copepod Pleuromamma piseki frequently have a conspicuous spermatophore within their body cavity. This species is a strong vertical migrator and males with spermathophores migrate to slightly shallower nighttime depths than males lacking them. It is suggested that those copepods with spermatophores are ready to mate and that they aggregate near the surface as an adaptation to increase their chances of finding a mate. During matting, this behavior may be superimposed on the other environmental cues which affect depth distributions and may complicate studies designed to determine the causes and benefits of migration patterns.

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