Phenology of two Acanthophora najadiformis (Rhodophyta, Ceramiales) Populations in the Ionian Sea (Mediterranean Sea)

Cecere, Ester; Saracino, O. D.; Fanelli, Margherita; Petrocelli, Antonella

doi:10.1515/bot.2000.011

Cited by 11 publications

(5 citation statements)

References 22 publications

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“…In the red macroalgae Chondrus crispus (reviewed in Collén et al, 2014) and C. verrucosus (Bellgrove & Aoki, 2008), many intertidal populations are gametophyte biased. In contrast, ploidy dominance varies among species but sporophytes are often observed at greater frequencies in many populations in the Gracilariales (reviewed in Kain & Destombe, 1995, but also see Vieira et al, 2022), the Ceramiales (Cecere et al, 2000), some species of the Gigartinales (e.g., Hypnea musciformis ; Caires et al, 2013), as well as in other red macroalgae, such as Pterocladiella capillacea (Patarra et al, 2020) and green macroalgae, such as two Ulva spp. (Du et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

Tetrasporophytic bias coupled with heterozygote deficiency in Antarctic Plocamium sp. (Florideophyceae, Rhodophyta)

Heiser

Amsler

Stoeckel

et al. 2023

Journal of Phycology

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Meiosis and syngamy generate an alternation between two ploidy stages, but the timing of these two processes varies widely across taxa, thereby generating life cycle diversity. One hypothesis suggests that life cycles with long‐lived haploid stages are correlated with selfing, asexual reproduction, or both. Though mostly studied in angiosperms, selfing and asexual reproduction are often associated with marginal habitats. Yet, in haploid‐diploid macroalgae, these two reproductive modes have subtle but unique consequences whereby predictions from angiosperms may not apply. Along the western Antarctic Peninsula, there is a thriving macroalgal community, providing an opportunity to explore reproductive system variation in haploid‐diploid macroalgae at high latitudes where endemism is common. Plocamium sp. is a widespread and abundant red macroalga observed within this ecosystem. We sampled 12 sites during the 2017 and 2018 field seasons and used 10 microsatellite loci to describe the reproductive system. Overall genotypic richness and evenness were high, suggesting sexual reproduction. Eight sites were dominated by tetrasporophytes, but there was strong heterozygote deficiency, suggesting intergametophytic selfing. We observed slight differences in the prevailing reproductive mode among sites, possibly due to local conditions (e.g., disturbance) that may contribute to site‐specific variation. It remains to be determined whether high levels of selfing are characteristic of macroalgae more generally at high latitudes, due to the haploid‐diploid life cycle, or both. Further investigations of algal life cycles will likely reveal the processes underlying the maintenance of sexual reproduction more broadly across eukaryotes, but more studies of natural populations are required.

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Section: Discussionmentioning

confidence: 99%

Tetrasporophytic bias coupled with heterozygote deficiency in Antarctic Plocamium sp. (Florideophyceae, Rhodophyta)

Heiser

Amsler

Stoeckel

et al. 2023

Journal of Phycology

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“…Regarding the reproductive phenology of the "nigrescens" population studied herein, the highest proportion of the total biomass was observed to be made up by tetrasporophytes, followed by female and male gametophytes, and then by vegetative fronds. According to Cecere et al (2000), the dominance of populations by the tetrasporophyte appears to be very common in red algae, and this was also previously reported in natural populations of Hypnea species (Rangaiah & Rao 1983;Schenkman 1989;Wallner et al 1992;Faccini & Berchez 2000;Reis & Yoneshigue-Valentin 2000;Kong & Ang Jr. 2004;Mouradi et al 2008;Caires et al 2013b). Two main hypotheses can explain the predominant occurrence of the tetrasporophytic phase in Hypnea populations: (1) tetrasporophytes may produce more upright thalli per plant and are thus more robust under stressful conditions (Mathieson 1989); or (2) populations maintain themselves mainly by vegetative reproduction (Schenkman 1989).…”

Section: Discussionmentioning

confidence: 99%

“…Despite this, the lengths of male gametophytes were positively correlated with air temperature and insolation, and negatively correlated with precipitation and humidity, confirming that the optimal conditions for the development of this stage occurred during the dry season. Cecere et al (2000) postulated that gametophytes are ephemeral; therefore, they could die soon after reproduction or become reproductive when still so small as to be undetected. Our findings suggested that, at least for the studied population of the "nigrescens" variant of Hypnea pseudomusciformis, this is not true, since tetrasporophytes and gametophytes had similar thallus heights.…”

Section: Discussionmentioning

confidence: 99%

Reproductive morphology and phenological aspects of one morphological variant of Hypnea pseudomusciformis (Gigartinales, Rhodophyta)

et al. 2019

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“…According to Edyvean & Ford (1984) and Bierzychudek (1985), the species implementing such an alternative adaptive strategy would be able both to generate genetic diversity by sexual reproduction and to replicate a successful genotype at different times. Studies carried out on extensive populations of Acanthophora nayadiformis (Cecere et al. 2000b), Alsidium corallinum (Cecere et al.…”

Section: What Might Be the Advantages Of The Alternative Vegetative Rmentioning

confidence: 99%

“…The contribution of multicellular propagules to the increase of local populations is probably considerable, although it has not been quantified. Pluri‐annual research into the phenology of some species showed that all plants profusely form multicellular propagules in the growing season (Cecere et al. 2000b, 2002a).…”

Section: Are Multicellular Propagules Useful For Increasing Local Popmentioning

confidence: 99%

Vegetative reproduction by multicellular propagules in Rhodophyta: an overview

2011

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This paper deals with vegetative reproduction by multicellular propagules in Rhodophyta. An extensive examination of the relevant literature shows that this phenomenon in Rhodophyta is not well known. A propagule is here defined as a vegetative multicellular structure which spontaneously detaches from the parent thallus and gives rise to a new individual. The origin and morphological features of multicellular propagules are examined in the various known propagule‐forming species. The importance of multicellular propagules as both overwintering and resting organs and as a taxonomic feature is also shown. Their role in increasing local populations and/or for long‐distance dispersal is discussed. The relative abundance of vegetative reproduction by multicellular propagules versus sexual reproduction, as well as the advantages of this additional mode of reproduction, are shown and discussed. The production of multicellular propagules may contribute to the capacity of species to increase populations, to weather unpredictable environmental changes, to survive in conditions that would be lethal for entire thalli, and to reach new habitats. As resting organs, they may also be responsible for long‐distance dispersal and may account for the introduction of some alien species. Accordingly, propagule‐forming species are probably more competitive than taxa that do not produce such propagules. These considerations should be taken into account in future studies of the biology, ecology and demography of Rhodophyta.

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Phenology of two Acanthophora najadiformis (Rhodophyta, Ceramiales) Populations in the Ionian Sea (Mediterranean Sea)

Cited by 11 publications

References 22 publications

Tetrasporophytic bias coupled with heterozygote deficiency in Antarctic Plocamium sp. (Florideophyceae, Rhodophyta)

Tetrasporophytic bias coupled with heterozygote deficiency in Antarctic Plocamium sp. (Florideophyceae, Rhodophyta)

Reproductive morphology and phenological aspects of one morphological variant of Hypnea pseudomusciformis (Gigartinales, Rhodophyta)

Vegetative reproduction by multicellular propagules in Rhodophyta: an overview

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