Abstract
Abstract. The effects of temperature on the development of marine invertebrates have been studied primarily in benthic species. For this study, gametes were collected from Nanomia bijuga, a mesopelagic siphonophore, and were self‐crossed. Fertilized eggs kept at 8 and 12°C developed more slowly at the lower temperature. Developing stages were preserved after 2, 4, 6, and 9 days of development for comparative analysis with SEM. Concurrent experiments compared survival. Eggs collected from two additional colonies were placed in four temperature treatments: 4, 8, 12, and 18°C. The young developed normally in all treatments, but survived longer at lower temperatures. Young of N. bijuga will develop to siphonulae possessing tentacles, nematocysts, and a functional gastrozooid without being fed. Nonetheless, it is likely that food constraints, rather than temperature, limited survival in this study.
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