Zur Determination der zeitlichen Verteilung von Fortpflanzungsprozessen in Laborkulturen des PolychaetenTyposyllis prolifera

Franke, Heinz-Dieter

doi:10.1007/bf01983542

Cited by 32 publications

(36 citation statements)

References 9 publications

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“…Following studies were focused mainly on the relationship between regeneration and sexual reproduction based on experiments of removal of the pharynx and/or proventricle, which might play a role during stolonization (Durchon, , ; Junqua, ; Okada, ; Wissocq, , ). Some of the most recent studies were those published by Franke (, ), Heacox and Schroeder (), and Franke and Pfannenstiel (). After three decades, this topic re‐emerged with a study about the role of the proventricle during the stolonization of T. antoni (Weidhase, Bleidorn et al., ).…”

Section: Syllid Regenerationmentioning

confidence: 99%

Regeneration mechanisms in Syllidae (Annelida)

2018

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Syllidae is one of the most species‐rich groups within Annelida, with a wide variety of reproductive modes and different regenerative processes. Syllids have striking ability to regenerate their body anteriorly and posteriorly, which in many species is redeployed during sexual (schizogamy) and asexual (fission) reproduction. This review summarizes the available data on regeneration in syllids, covering descriptions of regenerative mechanisms in different species as well as regeneration in relation to reproductive modes. Our survey shows that posterior regeneration is widely distributed in syllids, whereas anterior regeneration is limited in most of the species, excepting those reproducing by fission. The latter reproductive mode is well known for a few species belonging to Autolytinae, Eusyllinae, and Syllinae. Patterns of fission areas have been studied in these animals. Deviations of the regular regeneration pattern or aberrant forms such as bifurcated animals or individuals with multiple heads have been reported for several species. Some of these aberrations show a deviation of the bilateral symmetry and antero‐posterior axis, which, interestingly, can also be observed in the regular branching body pattern of some species of syllids.

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Section: Syllid Regenerationmentioning

confidence: 99%

Regeneration mechanisms in Syllidae (Annelida)

2018

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“…Warm water temperatures induce the production of gametes and hasten the time to maturity in a variety of polychaetes and other taxa, e.g . the polychaetes Bispira volutacornis , Kefersteinia cirrata , Syllis prolifera , and the bivalves Ostrea edulis and Crassostrea gigas (Orton 1920; Franke 1980; Olive & Pillai 1983; Steele & Mulcahy 1999; Nash & Keegan 2003). There is an extensive literature demonstrating faster growth rates and high survival of invertebrate larvae at warm temperatures.…”

Section: Discussionmentioning

confidence: 99%

“…Polychaetes often have endogenous cycles that are maintained for months or years in the absence of external cues, so long as conditions are adequate for survival and reproduction ( e.g . Franke 1980; Olive 1995). If gametogenesis is cued by or maintained by an endogenous rhythm in O. collaris , these animals may have continued the set cycle under laboratory conditions.…”

Section: Discussionmentioning

confidence: 99%

Environmental cues and seasonal reproduction in a temperate estuary: a case study of Owenia collaris (Annelida: Polychaeta, Oweniidae)

2011

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Coordination of gametogenesis and spawning during restricted breeding seasons increases availability of mates, fertilization rates, and often success of offspring. Orton’s Rule predicts water temperature as the dominant environmental cue for gametogenesis or spawning in temperate invertebrates. Crisp’s Rule predicts that species producing planktotrophic larvae will time their reproduction to ensure optimal nutrition for the larvae. Owenia collaris (Annelida: Oweniidae) is a temperate polychaete that produces planktotrophic larvae that remain in the water column for several weeks. Reproductive phenology and its relationship to the environment were investigated in an estuarine population of O. collaris using field and laboratory studies. Owenia collaris produced mature gametes between March and September each year during the productive season between the spring and fall transitions when day lengths were 12 h or more, alkalinity was 8.1 or higher, and temperature was 11 °C or higher. Gamete production was not related to seasonal changes in salinity or benthic phytoplankton concentrations and gametes were present prior to the spring phytoplankton bloom. In laboratory experiments, production of gametes was influenced somewhat by manipulating day lengths but not adult food. The association with predictable and stable environmental cycles (day length) and a broad spawning season suggest that this species is unlikely to mis‐match with larval food availability which would lead to reduced availability of recruits in any given year, supporting Crisp’s Rule. Our data do not support the hypothesis that reproductive timing in this species is driven by access to excess energy required by adults to initiate the production of gametes. Our data also do not support Orton’s premise that temperature is the primary controlling factor of reproduction in this temperate marine invertebrate.

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“…In vivo experiments (Franke 1980(Franke , 1983a(Franke , 1983b consisting of the removal and re-implantation of the prostomiun and proventriculus have demonstrated that reproductive control in T. prolifera is linked to lunar-rhythm secretion of a prostomial hormone (Franke 1985) (Fig. 3).…”

Section: The Stolonization Strategy Of Syllidaementioning

confidence: 98%

“…The mean date of peak stolon abondance is 13 days after a new moon (NM). Sexual development is initiated towards the end of the lunar cycle, when a prostomial hormone is secreted and proventricular activity is inhibited (after Franke 1980Franke , 1983aFranke , 1983b. FM, full moon.…”

Section: The Reproductive Cycle Of Nephtys Hombergi (Nephtyidae)mentioning

confidence: 99%

Endocrine and environmental control of reproduction in Polychaeta

Andries¹

2001

Can. J. Zool.

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In Polychaeta, as in many invertebrates, reproduction is controlled by both environmental and endocrine factors. Although the effects of environmental factors on reproductive behaviour are briefly discussed, this review focuses on the endocrinology of reproduction. As Nereidae are the most intensively studied polychaetes, their epigamic monotelic strategy is discussed first in this review. Although a large number of physiological observations have been made, biochemical data have been greatly lacking until recent years, except, however, for the recent isolation of several pheromones. These substances, such as uric acid and L-cysteine gluthathione disulfide, occur widely and must be present at high concentrations in order to exert their physiological effects. Results obtained from iteroparous species are also considered. The stolonization strategy of Syllidae, the control of vitellogenesis in Nephtyidae, Phyllodocidae, Polynoidae, and Cirratulidae, and the regulation of gamete maturation in Arenicolidae and Pectinariidae are discussed. As with Nereidae, our knowledge of endocrine control is mainly based on experimental data, since only spermmaturation factor in the genus Arenicola has been identified. Therefore, despite numerous interesting experimental studies in which functional roles for polychaete reproductive hormones have been described, their nature, their primary targets, and their mechanism of action are unfortunately still largely unknown.Résumé : Chez les polychètes, comme chez de nombreux invertébrés, la reproduction est sous le contrôle de facteurs de l'environnement et de facteurs endocriniens. L'objet essentiel de cette synthèse est le contrôle endocrinien de la reproduction; des données plus fragmentaires ont trait aux effets des facteurs environnementaux. Puisque les Nereidae sont les polychètes les mieux connus, l'étude de leur stratégie monotélique épigame est envisagée dans un premier point. Toutefois, malgré de nombreuses observations physiologiques, peu de données biochimiques sont disponibles, si l'on excepte l'isolement récent de plusieurs phéromones. Celles-ci, comme l'acide urique et le disulfure de L-cystéine glutathion, sont des substances ubiquistes qui, de ce fait, doivent être présentes en concentrations élevées afin de pouvoir exercer une action physiologique. Les résultats obtenus chez les espèces itéropares font l'objet d'un second point. La stratégie de stolonisation des Syllidae, le contrôle de la vitellogenèse des Nephtyidae, des Phyllodocidae, des Polynoidae et des Cirratulidae, ainsi que le contrôle de la maturation des gamètes des Arenicolidae et des Pectinariidae sont examinés. Comme dans le cas des Nereidae, notre compréhension du contrôle endocrinien repose essentiellement sur des données expérimentales. Seul est identifié le facteur de maturation des spermatozoïdes d'Arenicola. Ainsi, malgré les nombreuses études expérimentales réalisées chez les polychètes et les multiples actions hormonales décrites dans les processus de reproduction, la nature des hormones, leurs cibl...

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Zur Determination der zeitlichen Verteilung von Fortpflanzungsprozessen in Laborkulturen des PolychaetenTyposyllis prolifera

Cited by 32 publications

References 9 publications

Regeneration mechanisms in Syllidae (Annelida)

Regeneration mechanisms in Syllidae (Annelida)

Environmental cues and seasonal reproduction in a temperate estuary: a case study of Owenia collaris (Annelida: Polychaeta, Oweniidae)

Endocrine and environmental control of reproduction in Polychaeta

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