Aggregation of Spawning Appendicularians in Surface Windrows
Abstract: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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