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Larson, R.J.. |
LARSON, R.J., 1997. Feeding behaviour of Caribbean Scyphomedusae: Cassiopea frondosa (Pallas) and Cassiopea xamachana (Bigelow). Studies Nat. Hist. Caribbean Region 73, Amsterdam 1997: 43-54. Cassiopea frondosa and C. xamachana are carnivorous. Prey are filtered from the water by the pumping activity of the umbrella. Prey, predominantly small epibenthic crustaceans (0.2- 10 mm in length) are caught mostly by interception. However, some prey may impact on the oral surface through turbulence or by their own locomotion. Prey capture was essentially the same for both species, except that the vesicles take an active part in prey capture only in C. frondosa. Ingestion occurred after the digitate-fringed lips of the funnel-shaped oral ostia opened. The digitata... |
Tipo: Article / Letter to the editor |
Palavras-chave: Feeding; Scyphomedusae; Prey selection; Puerto Rico.; Caribbean; Medusae; Cassiopea. |
Ano: 1997 |
URL: http://www.repository.naturalis.nl/record/503184 |
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Larson, R.J.. |
Olindias tenuis is a shallow-water hydromedusa from the Caribbean that during the day is cryptic, residing among seagrass and algae, and after sunset swims into the water column. The medusae forage by swimming towards the surface, and then slowly drifting downwards with the exumbrella uppermost and the long primary tentacles hanging below. Positive buoyancy of the umbrella reduces the sinking rate. Both the activity cycle and buoyancy appear to be regulated by light, since the intensity of light alters the normal activity cycle both day and night. Feeding occurs once the medusae have entered the water column. At Puerto Rico, Olindias fed mostly on calanoid copepods; but chaetognaths, polychaetes, fish larvae, and amphipods are also consumed. Possible... |
Tipo: Article / Letter to the editor |
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Ano: 1986 |
URL: http://www.repository.naturalis.nl/record/506103 |
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