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Free Content Aggregation of Spawning Appendicularians in Surface Windrows

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Recurring aggregations of the appendicularian, Oikopleura longicauda, occurred in parallel surface windrows near Catalina Island, California, during April 1981. Maximum densities reached 3,565 appendicularians·l−l. All appendiculanans within the aggregations were free swimming (outside of their houses), sexually mature and spawning. Spawning individuals swam upward at a mean velocity of 4.7 cm·sec−1 resulting in their accumulation in the convergences of surface vortices. Spawning individuals released a mean of 104 eggs each. In surface waters between the windrows O. longicauda reached densities of only 1.2 animals·l−1. These individuals were much smaller and sexually immature. Aggregation of appendicularians within windrows may be a reproductive adaptation resulting in greater cross fertilization and genetic mixing.

Document Type: Research Article

Publication date: 1982-01-01

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  • The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
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