Hermaphroditism, gonochorism, and asexual reproduction inCassiopeasp.—an immigrant in the islands of Hawai'i
| Autor: | D. K. Hofmann, M. G. Hadfield |
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| Rok vydání: | 2002 |
| Předmět: | |
| Zdroj: | Invertebrate Reproduction & Development. 41:215-221 |
| ISSN: | 2157-0272 0792-4259 |
| DOI: | 10.1080/07924259.2002.9652754 |
| Popis: | Summary Two populations of the conspicuous, semi-sessile medusae of the rhizostome genus Cassiopea, both morphologically similar to Cassiopea andromeda from the Red Sea and Indopacific, were recently studied on Oahu (Hawai'i), one from a sheltered saltwater pond (the Hilton Lagoon) next to Ala Wai Harbor, Honolulu, and the second from the canals of a fish farm near Kahuku on NE Oahu. Gonad differentiation, checked in 1998, and again in 1999 and 2000, was unexpectedly different in medusae from these two locations. Contrary to all earlier reports and personal observations of strict gonochorism in C. andromeda, the majority of the Hilton Lagoon medusae collected in 1998 were hermaphroditic with female and male parts intermingling in the gonads. This is an exceptional case in scyphozoans. However, this hermaphroditic condition, which was observed again in 1999, was not stable over time. All six medusae taken from the same lagoon in 2000 were distinctly gonochoristic; four were males, and two were females broo... |
| Databáze: | OpenAIRE |
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