Environmental responses of jellyfish polyps as drivers of medusa populations off the coast of Namibia

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dc.contributor.authorZiegler, L.
dc.contributor.authorGibbons, Mark J.
dc.date.accessioned2018-10-22T12:01:02Z
dc.date.available2018-10-22T12:01:02Z
dc.date.issued2018
dc.description.abstractJellyfish populations in the southeastern Atlantic off the coast of Namibia have increased subsequent to the decline of small pelagic fisheries at the end of the 1960s, although the environment there has also become warmer and the waters off Walvis Bay have become richer in zooplankton in recent years. Laboratory experiments were conducted with the scyphozoan jellyfish Chrysaora fulgida to investigate the effects of food density (0, 30, 70, 100 or 150 Artemia nauplii 200 ml–1), feeding frequency (once daily or once every third day) and water temperature (12, 16 or 20 °C) on the asexual reproduction, growth and development of polyps. The results of a generalised linear mixed-effects model reveal that all variables impacted asexual reproduction, with greater polyp production attained at higher food concentrations, increased feeding frequencies and increased temperatures. The most common mode of asexual reproduction was by lateral budding. These laboratory results suggest that polyps of C. fulgi a may have proliferated off Namibia in recent times, which would contribute to increased numbers of jellyfish there.en_US
dc.description.accreditationDHET
dc.identifier.citationZiegler, L. & Gibbons, M.J. (2018). Environmental responses of jellyfish polyps as drivers of medusa populations off the coast of Namibia. African Journal of Marine Science, 40(3): 323-329.en_US
dc.identifier.issn1814-232X
dc.identifier.urihttp://dx.doi.org/10.2989/1814232X.2018.1500397
dc.identifier.urihttp://hdl.handle.net/10566/4150
dc.language.isoenen_US
dc.privacy.showsubmitterFALSE
dc.publisherNational Inquiry Services Centreen_US
dc.status.ispeerreviewedTRUE
dc.subjectAsexual reproductionen_US
dc.subjectFood availabilityen_US
dc.subjectMetagenesisen_US
dc.subjectNorthern Benguela Current ecosystemen_US
dc.subjectRising temperaturesen_US
dc.subjectScyphozoa Chrysaora fulgidaen_US
dc.subjectEnvironmental changeen_US
dc.titleEnvironmental responses of jellyfish polyps as drivers of medusa populations off the coast of Namibiaen_US
dc.typeArticleen_US

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