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3 resultados encontrados para: AUTOR: Ohtsuka, Susumu
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Planktonic phases in symbiotic copepods: a review
Ohtsuka, Susumu ; Madinabeitia, Ione (coaut.) ; Yamashita, Hirofumi (coaut.) ; Venmathi Maran, Balu Alagar (coaut.) ; Suárez Morales, Eduardo (coaut.) ; Ho, Ju-shey (coaut.) ;
Contenido en: Bulletin, Southern California Academy of Sciences Vol. 117, no. 2 (Aug. 2018), p. 104-119 ISSN: 0038-3872
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Resumen en español

In symbiotic copepods, most naupliar stages are typically planktonic, playing a primary role in dispersal, while the first copepodid usually represents the infective stage. Later copepodid stages, including adults, are associated with host organisms. Many symbiotic copepods have abbreviated life cycles, with a reduced number of naupliar stages and two different feeding habits. These patterns are presumably related to distinct life cycles strategies. Exceptional cases are exemplified by members of theMonstrillidae and Thaumatopsyllidae, both of which are protelean parasites, with infective nauplii and non-feeding planktonic adults. In the Caligidae, the life cycle follows a generalized pattern, but adults of many species like Caligus undulatus seem to exhibit a dual mode of life involving host switching. Adults leaving the first host become temporarily planktonic before attaching to the final host. This dual mode of life is also found in adults of the Ergasilidae. Abbreviation of the planktonic phase is characteristic for some symbiotic taxa, thus suggesting that they have evolved to become highly efficient in locating and infecting new hosts without needing long-distance larval dispersal. The life cycle of copepods associated with zooplankters is also briefly reviewed. Zooplankters are clearly less used as hosts by copepods than benthic invertebrates. It is likely that symbiotic copepods dynamically utilize planktonic phases in their life cycle, thus maintaining the balance between dispersal, host location, reproduction, and predator-avoidance strategies.


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On the occurrence of caligids (Copepoda: Siphonostomatoida) in the marine plankton: a review and checklist
Venmathi Maran, Balu Alagar ; Suárez Morales, Eduardo ; Ohtsuka, Susumu (coaut.) ; Soh, Ho Young (coaut.) ; Hwang, Ui Wook (coaut.) ;
Contenido en: Zootaxa Vol. 4174, no. 1 (Oct. 2016), p. 437–447 ISSN: 1175-5334
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Resumen en inglés

Members of the copepod genus Caligus Müller, 1785 (Siphonostomatoida: Caligidae) are commonly referred to as sea lice. Virtually all of the more than 450 species utilize marine fishes as hosts, however, an increasing number of records from marine plankton samples shows that at least some species reside in the water column during their adult phase. Members of three different genera, Caligus, Lepeophtheirus von Nordmann, 1832, and Metacaligus Thomsen, 1949 have been reported from plankton samples off eastern Asia and in the north-western Atlantic. Thirteen species have so far been consistently reported from the plankton only with no information on their hosts. Here we review the various hypotheses previously proposed to explain the presence of caligids in the water column, i.e. accidental occurrence, behavioral detachment from the host during mate location, and host-switching. The discovery of adults of two species of Caligus with no other developmental stages on their teleost hosts, suggests an ontogenetic host-switching after the final molt since both species also occurred in plankton samples. A checklist of all caligid records from the marine plankton, including known host data, is presented.