Seasonal variation of reproductive and vegetative phases of Gracilaria pacifica Abbott, in Estero de Punta Banda, Baja California, Mexico

Niembro, J.M Lobo; Rosas, Ronaldo; Ramirez, R Marcos; González, Jhon Alexander

doi:10.7773/cm.v19i2.927

Cited by 6 publications

(3 citation statements)

References 4 publications

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“…It is noteworthy that free‐floating populations of other Gracilaria species tend to be dominated by either diploid (Rao ; Nelson ; Aguilar‐Rosas et al . ; Kain & Destombe ; Guillemin et al . ), or vegetative, possibly sterile, thalli (Stokke ; Kain & Destombe ; Iyer et al .…”

Section: Discussionmentioning

confidence: 99%

“…Guillemin et al 2013). It is noteworthy that free-floating populations of other Gracilaria species tend to be dominated by either diploid (Rao 1973;Nelson 1989;Aguilar-Rosas et al 1993;Kain & Destombe 1995;Guillemin et al 2008a), or vegetative, possibly sterile, thalli (Stokke 1957;Kain & Destombe 1995;Iyer et al 2004;Guillemin et al 2008a). We require more data to tease apart the relative importance of fitness, founder effects and demographic stochasticity in driving the diploid bias in the introduced range.…”

Section: Shifts In Ploidy Ratiomentioning

confidence: 99%

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Invasion of novel habitats uncouples haplo‐diplontic life cycles

et al. 2016

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Baker's Law predicts uniparental reproduction will facilitate colonization success in novel habitats. While evidence supports this prediction among colonizing plants and animals, few studies have investigated shifts in reproductive mode in haplo-diplontic species in which both prolonged haploid and diploid stages separate meiosis and fertilization in time and space. Due to this separation, asexual reproduction can yield the dominance of one of the ploidy stages in colonizing populations. We tested for shifts in ploidy and reproductive mode across native and introduced populations of the red seaweed Gracilaria vermiculophylla. Native populations in the northwest Pacific Ocean were nearly always attached by holdfasts to hard substrata and, as is characteristic of the genus, haploid-diploid ratios were slightly diploid-biased. In contrast, along North American and European coastlines, introduced populations nearly always floated atop soft-sediment mudflats and were overwhelmingly dominated by diploid thalli without holdfasts. Introduced populations exhibited population genetic signals consistent with extensive vegetative fragmentation, while native populations did not. Thus, the ecological shift from attached to unattached thalli, ostensibly necessitated by the invasion of soft-sediment habitats, correlated with shifts from sexual to asexual reproduction and slight to strong diploid bias. We extend Baker's Law by predicting other colonizing haplo-diplontic species will show similar increases in asexuality that correlate with the dominance of one ploidy stage. Labile mating systems likely facilitate colonization success and subsequent range expansion, but for haplo-diplontic species, the long-term eco-evolutionary impacts will depend on which ploidy stage is lost and the degree to which asexual reproduction is canalized.

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Section: Discussionmentioning

confidence: 99%

Section: Shifts In Ploidy Ratiomentioning

confidence: 99%

Invasion of novel habitats uncouples haplo‐diplontic life cycles

et al. 2016

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“…El talo se fija al sustrato con un pequeño disco y células rizoidales en la sección basal. Hábitat: Intermareal y submareal somero, asociadas a pozas de marea, rocas, terrazas, conchas, arena y epifita a macroalgas (Aguilar-Rosas et al 2000;Boraso, 1975Boraso, , 1979Boraso de Zaixso, 2004;Cotton, 1915;Mendoza & Nizovoy, 2000;Norris, 2010;Ramírez & Santelices, 1991;Taylor, 1939). Código HCS: LMS00001094.…”

Section: Ulva Linza Linnaeusunclassified

First catalogue of benthic marine macroalgae from glacier-influenced environments of the Beagle Channel, deposited in the new Sub-Antarctic Cryptogamic Herbarium (SCH) of the University of Magallanes

Rodriguez Provoste,

Gibelli,

Bahamonde

et al. 2024

AIP

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The environmental characteristics and geomorphological landscape in the sub-Antarctic Magellanic ecoregion underpin a biological diversity that evolved adapting to the microhabitats produced by these heterogeneous ecological conditions. The high level of endemism found in these biological communities is nowadays protected thanks to the creation of the Cape Horn Biosphere Reserve (CHBR), a natural laboratory at the southern end of the sub-Antarctic Magellanic ecoregion. Studies produced in this region offer a valuable knowledge of its biological, ecological and cultural facets in a state still scarcely impacted by anthropogenic activities. The retreat of glaciers present along the channels and fjords of the CHBR due to global climate change impacts the marine benthic and macroalgae communities hosted in these water bodies. European expeditions in the 18th and 19th centuries pioneered the works which provided our current knowledge about this subantarctic marine flora. Nevertheless, there is still a gap of taxonomic information of macroalgae diversity in the CHBR. To solve this gap, with support of the Cape Horn Internationional Center (CHIC), we created the Sub-Antarctic Cryptogamic Herbarium (SCH) hosted at the Antarctic and Sub-Antarctic Marine Ecosystems Laboratory (LEMAS), University of Magallanes. In 2020, the New York Botanical Garden indexed the SCH in its Index Herbariorum. This indexation granted by this world-renowned institution places the SCH's biological collection as the world's southernmost cryptogamic repository. As such, the SCH's botanical collection is currently the only gateway to the subantarctic ecosystem's biological legacy. The catalogue below provides information about the ecological and morphological characteristics of macroalgae deposited in the SCH, with particular focus on those species present in the CHBR. We identified 54 species. Among them 23 belong to the Rhodophyta division (43%), 19 species to the Chlorophyta division (35%), and 12 species to the Ochrophyta division (22%). In the context of rapid global change, involving increasingly threatened taxa due to human impact, baseline studies and records deposited at the SCH will provide an essential tool for assessing patterns of change and defining conservation practices to protect the rich biodiversity of these sub-Antarctic ecosystems.

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A review of the life history, reproduction and phenology of Gracilaria

1995

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The basic life history of the red alga Gracilaria is of the three-phase Polysiphonia type but a number of species show deviations. Plants can bear both gametangia and tetrasporangia, either on separate parts of the thallus or on the same. Explanations include the in situ germination of tetraspores (allowing gametophytic thalli to be epiphytic on tetrasporophytes), the coalescence of spores or developing discs (resulting in chimaeras), mitotic recombination during cell division in the mature diploid thallus (resulting in patches of diploid male and female cells on the tetrasporophyte), a mutation eliminating the repression of female expression allowing haploid male plants to be bisexual and initial failure of cell walls to form during the development of tetraspores. Polyploids can be produced from plants with diploid gametangia. The sexes and phases are usually morphologically identical but gametophytes or their parts may be smaller. The growth rates of the sexes may differ and diploid juveniles may survive better than haploid. Neither polyploidy nor hybridization results in superior growth. The sex ratio is probably 1:1 but females may appear to be more abundant. Diploid and haploid phases are usually either about equal or diploids predominate, often depending on the type of substratum. At high latitudes reproduction peaks in late summer whereas in the tropics it may be high all year. In temperate regions growth rate is fastest and biomass highest in late summer; in the tropics peak biomass is mainly in the winter. Spermatia are effective for only a few h. Spores vary in size around 25 Am, diploid ones usually being larger. Cystocarps or tetrasporangia in the field may not currently be releasing spores. In the laboratory spore release shows a diurnal rhythm, peaking during the night or day according to the species. All the above attributes are potentially important in planning and executing Gracilaria cultivation.

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Seasonal variation of reproductive and vegetative phases of Gracilaria pacifica Abbott, in Estero de Punta Banda, Baja California, Mexico

Abstract: The seasonal variation of the reproductive and vegetative phases of Gt-acilatia pacifìca Abbott was studied in two populations with different type of substrate,

Cited by 6 publications

References 4 publications

Invasion of novel habitats uncouples haplo‐diplontic life cycles

Invasion of novel habitats uncouples haplo‐diplontic life cycles

First catalogue of benthic marine macroalgae from glacier-influenced environments of the Beagle Channel, deposited in the new Sub-Antarctic Cryptogamic Herbarium (SCH) of the University of Magallanes

A review of the life history, reproduction and phenology of Gracilaria

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