Over het archief
Het OWA, het open archief van het Waterbouwkundig Laboratorium heeft tot doel alle vrij toegankelijke onderzoeksresultaten van dit instituut in digitale vorm aan te bieden. Op die manier wil het de zichtbaarheid, verspreiding en gebruik van deze onderzoeksresultaten, alsook de wetenschappelijke communicatie maximaal bevorderen.
Dit archief wordt uitgebouwd en beheerd volgens de principes van de Open Access Movement, en het daaruit ontstane Open Archives Initiative.
Basisinformatie over ‘Open Access to scholarly information'.
| one publication added to basket [15870] |
The holopelagic life cycle of the deep-sea medusa Periphylla periphylla (Scyphozoa, Coronatae)
Jarms, G.; Båmstedt, U.; Tiemann, H.; Martinussen, M.B.; Fosså, J.H. (1999). The holopelagic life cycle of the deep-sea medusa Periphylla periphylla (Scyphozoa, Coronatae). Sarsia 84(1): 55-65
In: Sarsia. University of Bergen. Universitetsforlaget: Bergen. ISSN 0036-4827; e-ISSN 1503-1128, meer
|  |
| Auteurs | | Top |
- Jarms, G., meer
- Båmstedt, U.
- Tiemann, H.
|
- Martinussen, M.B.
- Fosså, J.H.
|
|
| Abstract |
The life cycle of Periphylla periphylla (Péron & Lesueur, 1809) is described. It is the only known direct development of a coronate scyphozoa, showing a holopelagic life cycle without any sessile stage. It also lacks an ephyra stage that normally precedes the medusa stage and it is the first scyphozoan life cycle with sexual propagation where the planula stage is missing. The morphology and histology in the early development is described and a description of eight well recognised developmental stages, covering the period from egg to young medusa, is presented. A brief comparison of the population structure in 1992 and 1997 in Lurefjorden, Norway shows that there has been a dramatic change. The population in 1992 showed a normal size distribution with a median individual wet weight of 540 g, eggs and stages did not occur in the plankton and there was no significant recruitment. Eggs and larvae were first observed in 1993 and since then they have been present in all seasons. The population therefore showed a bimodal size distribution in 1997, composed of an old cohort with a median wet weight of 760 g and a new and numerically dominating cohort with a median wet weight of 40 g. The abundance and population structure of P. periphylla indicate an exceptionally high age potential for a jellyfish and very low mortality in Lurefjorden. |
IMIS is ontwikkeld en wordt gehost door het VLIZ.
