A preliminary laboratory study on the salinity and temperature tolerances of some medusae from the São Paulo coast, Brazil

Moreira, Gloria S.

doi:10.1590/s0373-55241978000200002

Cited by 6 publications

(1 citation statement)

References 7 publications

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“…Hansen (1951) reports that a combined temperature and salinity discontinuity in Oslo Fjord separates the hydromedusa Sarsia tubulosa, which occurs only in the discontinuity layer, from the hydromedusa Aglantha digitale and the siphonophore Lensia conoidea, both of which appear to diurnally migrate within the water mass below the discontinuity. Moreira (1973Moreira ( , 1978 reports that salinity discontinuities off Brazil limit the upward vertical migration of some species of hydro-medusae. Furthermore, temperature discontinuities off Brazil are also effective in limiting upward movement of some cold stenohaline species characteristic of deep subtropical waters, that are unable to tolerate the warm upper layers of shelf or coastal water.…”

Section: Discussionmentioning

confidence: 99%

Density Is Altered in Hydromedusae and Ctenophores in Response to Changes in Salinity

Mills¹

1984

The Biological Bulletin

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Laboratory experiments have determined the behavioral and gross physiological responses of hydromedusae and ctenophores subjected to sudden changes of salinities in the range that might be encountered in nature. Nine species of hydromedusae (Aequorea victoria, Aglantha digitate, Bougainvillia principis, Gonionemus vertens, Phialidium gregarium, Polyorchis penicillatus, Proboscidactyla flavicirrata, Sarsia tubulosa, Stomotoca atra) and two species of ctenophores (Bolinopsis infundibulum, Pleurobrachia bachei) were transferred from natural sea water of 30.5%o to modified sea waters of 19-38%o. Most species altered their density within a few hours by osmoconforming to salinities ranging from 23-38%o, so that equilibrium buoyancy (either positive, neutral, or negative, according to species) was regained along with normal behavior. Even salinity differences of only l-2%o required 30-60 minutes adjustment time. Prior to regaining their equilibrium buoyancies, differences in relative density caused medusae and ctenophores to sink when introduced to low salinity water and to float in high salinity water. Hence, simple density differences combined with the natural intermittent swimming behavior of hydromedusae suggest that in many cases medusae may not actually be able to cross sudden density gradients. In the event that a medusa or ctenophore is moved into water of a different salinity, however, its ability to adjust will allow the animal to resume normal swimming and feeding activities within a short time.

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Section: Discussionmentioning

confidence: 99%

Density Is Altered in Hydromedusae and Ctenophores in Response to Changes in Salinity

Mills¹

1984

The Biological Bulletin

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Diversity, Species Composition and Assemblage Dynamics of Estuarine Gelatinous and Semi-Gelatinous Zooplankton from Brazil

NogueiraJr.

Nascimento

Maciel

et al. 2018

Plankton Ecology of the Southwestern Atlantic

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Community Structure and Spatiotemporal Dynamics of the Zooplankton in the South Brazilian Bight: A Review

NogueiraJr.

Brandini

2018

Plankton Ecology of the Southwestern Atlantic

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A preliminary laboratory study on the salinity and temperature tolerances of some medusae from the São Paulo coast, Brazil

Abstract: SYNOPSISThe salinity and temperature tolerances of some species of medusae were studied in the laboratory.

Cited by 6 publications

References 7 publications

Density Is Altered in Hydromedusae and Ctenophores in Response to Changes in Salinity

Density Is Altered in Hydromedusae and Ctenophores in Response to Changes in Salinity

Diversity, Species Composition and Assemblage Dynamics of Estuarine Gelatinous and Semi-Gelatinous Zooplankton from Brazil

Community Structure and Spatiotemporal Dynamics of the Zooplankton in the South Brazilian Bight: A Review

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