Effects of temperature on the development and survival of Nanomia bijuga (Hydrozoa, Siphonophora)

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 t...

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Bibliographic Details
Published in:Invertebrate biology 2000-11, Vol.119 (4), p.379-385
Main Authors: Sherlock, Rob E., Robison, Bruce H.
Format: Article
Language:English
Subjects:
Aquatic invertebrates
Embryos
Gametes
Larvae
Larval development
Male animals
Marine ecology
mesopelagic
midwater
Nanomia bijuga
Ova
physonect
planulae
Pneumatophores
Sea water
siphonulae
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Summary: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.
ISSN:1077-8306
1744-7410
DOI:10.1111/j.1744-7410.2000.tb00106.x