Sexual and asexual reproduction in Didemnum rodriguesi (Ascidiacea, Didemnidae)

Ritzmann, Nicole F.; Rocha, Rosana M.; Roper, James J.

doi:10.1590/s0073-47212009000100015

Cited by 10 publications

(11 citation statements)

References 35 publications

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“…; Ritzmann et al. ). This may not be the case in D. fulgens , as fusions were more common in spring when gametogenesis had already started.…”

Section: Discussionmentioning

confidence: 98%

“…; Ritzmann et al. ). Brooding strategies in colonial ascidians range from the production of a few large and complex larvae per zooid to many small and simple larvae (i.e., larvae with undifferentiated tissues).…”

Section: Discussionmentioning

confidence: 98%

“…) and sub‐tropical seas (Ritzmann et al. ). These trade‐offs in resource allocation may be linked to temperature changes, nutrient availability, or “sexual exhaustion” after larval brooding has drained all nutrient reserves (Berrill ; López‐Legentil et al.…”

Section: Discussionmentioning

confidence: 99%

“…; Ritzmann et al. ). Exceptions to this trend have been reported for some invasive and introduced species, which appear to be able to reproduce year‐round in some of their introduced areas (Bourque et al.…”

mentioning

confidence: 98%

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Growing or reproducing in a temperate sea: optimization of resource allocation in a colonial ascidian

López‐Legentil

Erwin

Velasco

et al. 2013

Invertebrate Biology

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Relatively little is known about the life cycles of ascidians in temperate seas. Here, we investigated the biological cycle of the colonial ascidian Didemnum fulgens, a dominant species in some shallow localities of the NW Mediterranean Sea. Growth rates and frequencies of fission/fusion events were calculated over a period of 13 months, and the reproductive cycle determined after 32 months of observation. For analyses of reproduction, zooids were dissected in the laboratory and classified into five reproductive categories; these data were used to calculate a maturity index. For growth analyses, underwater photographs of marked colonies were used to estimate the surface area of D. fulgens colonies, calculate monthly growth rates, and document fusion and fission events. Clear seasonal patterns in reproduction and growth were observed, with distinct periods of investment into each function. Gonad maturation started in winter and larval release occurred in early summer, just before maximal sea temperatures were reached. After reproducing, colonies shrank and aestivated during the warmer summer months. Growth occurred during the cooler months, with maximal and minimal growth rates observed in winter and summer, respectively. Fusions and fissions occurred year‐round, although fissions were more frequent in fall (coincident with high growth rates) and fusions in spring (coincident with reproduction). These results add to the mounting evidence that ascidian life cycles in temperate seas are characterized by a trade‐off between investment in reproduction and growth, triggered by seasonal temperature shifts and constrained by resource availability during summer.

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“…; Ritzmann et al. ). This may not be the case in D. fulgens , as fusions were more common in spring when gametogenesis had already started.…”

Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 98%

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Growing or reproducing in a temperate sea: optimization of resource allocation in a colonial ascidian

López‐Legentil

Erwin

Velasco

et al. 2013

Invertebrate Biology

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“…Reproduction patterns in these groups range from one to two annual peaks in cold and temperate water species, to continuous reproduction throughout the year in warm water or invasive species (Millar 1971;Durante and Sebens 1994;Lambert et al 1995;Shenkar and Loya 2008;Ritzmann et al 2009;Nagar and Shenkar 2016;Shmuel and Shenkar 2017). Even in some species with a wide latitudinal distribution, reproductive patterns of warm and temperate water populations can clearly differ, e.g., Styela plicata (Sabbadin 1957;Yamaguchi 1975;Sciscioli et al 1978;Tursi and Matarrese 1981;Pineda et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Reproductive biology of the ascidians Styela rustica and Halocynthia pyriformis from Kongsfjorden, Svalbard, Arctic

et al. 2019

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Ascidians are abundant and well-represented members of worldwide benthic communities, including Antarctica and the Arctic. These organisms exhibit different reproductive patterns usually related to a latitudinal gradient, as do many marine invertebrate species. Reproductive seasonality varies from one or two annual peaks in cold and temperate water species to continuous reproduction throughout the year in warm water species. Styela rustica (Linnaeus 1767) and Halocynthia pyriformis (Rathke 1806) are solitary species with external fertilization and a wide distribution range, from the North Atlantic to the Arctic. The reproductive patterns of these two species were assessed for Arctic populations by year-round sampling and structural analysis of the gonads. Both species are hermaphrodites and showed marked seasonality in oocyte maturity and spawning; S. rustica peaked during the boreal summer and H. pyriformis in late spring. The two species also showed marked differences in mature oocyte sizes: H. pyriformis almost doubled those of S. rustica and, while spermatocytes of H. pyriformis were mature year-round, the maturity of male and female gametes was synchronized in S. rustica. The species thus showed an annual reproductive cycle coupled with a higher production period in the ecosystem, but also exhibited different strategies developed under the same environmental pressures.

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Reproductive cycle and ecology of the tropical ascidian Halocynthia spinosa in the Red Sea

Shmuel

Shenkar

2017

Mar Biol

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Sexual and asexual reproduction in Didemnum rodriguesi (Ascidiacea, Didemnidae)

Cited by 10 publications

References 35 publications

Growing or reproducing in a temperate sea: optimization of resource allocation in a colonial ascidian

Growing or reproducing in a temperate sea: optimization of resource allocation in a colonial ascidian

Reproductive biology of the ascidians Styela rustica and Halocynthia pyriformis from Kongsfjorden, Svalbard, Arctic

Reproductive cycle and ecology of the tropical ascidian Halocynthia spinosa in the Red Sea

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