A profound view and discourse on the typification and status of three confused taxa: Ruppia maritima, R. spiralis and R. cirrhosa

Hartog, C. Den; Triest, Ludwig

doi:10.1515/bot-2019-0045

Cited by 11 publications

(14 citation statements)

References 26 publications

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“…Nevertheless, Ruppia sampled from the two different bioregions shared highly similar sequences of ITS (ITS1-5.8S-ITS2) and rbcL (Figure S2 and S3). Phylogenetic placement of species within the family Ruppiaceae is a debated and difficult task because of their reduced morphology, high intraspecific variability, and hybridization [45,56]. While R. maritima and R. cirrhosa were identified as separate species [45,[56][57][58][59][60][61], three to four species and one cosmopolitan species complex (containing several lineages, including R. maritima and R. cirrhosa) have been proposed based on molecular evidence showing hybridization and a variety in polyploidy [57][58][59][60][61].…”

Section: Discussionmentioning

confidence: 99%

“…Phylogenetic placement of species within the family Ruppiaceae is a debated and difficult task because of their reduced morphology, high intraspecific variability, and hybridization [45,56]. While R. maritima and R. cirrhosa were identified as separate species [45,[56][57][58][59][60][61], three to four species and one cosmopolitan species complex (containing several lineages, including R. maritima and R. cirrhosa) have been proposed based on molecular evidence showing hybridization and a variety in polyploidy [57][58][59][60][61]. In addition, typification issues were raised by den Hartog and Triest [56] and Ruppia spiralis L. ex Dumortier was proposed as a more correct name for R. cirrhosa.…”

Section: Discussionmentioning

confidence: 99%

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Sensitivity of Photosynthesis to Warming in Two Similar Species of the Aquatic Angiosperm Ruppia from Tropical and Temperate Habitats

et al. 2021

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Climate change-related events, such as marine heatwaves, are increasing seawater temperatures, thereby putting pressure on marine biota. The cosmopolitan distribution and significant contribution to marine primary production by the genus Ruppia makes them interesting organisms to study thermal tolerance and local adaptation. In this study, we investigated the photosynthetic responses in Ruppia to the predicted future warming in two contrasting bioregions, temperate Sweden and tropical Thailand. Through DNA barcoding, specimens were determined to Ruppia cirrhosa for Sweden and Ruppia maritima for Thailand. Photosynthetic responses were assessed using pulse amplitude-modulated fluorometry, firstly in short time incubations at 18, 23, 28, and 33 °C in the Swedish set-up and 28, 33, 38, and 43 °C in the Thai set-up. Subsequent experiments were conducted to compare the short time effects to longer, five-day incubations in 28 °C for Swedish plants and 40 °C for Thai plants. Swedish R. cirrhosa displayed minor response, while Thai R. maritima was more sensitive to both direct and prolonged temperature stress with a drastic decrease in the photosynthetic parameters leading to mortality. The results indicate that in predicted warming scenarios, Swedish R. cirrhosa may sustain an efficient photosynthesis and potentially outcompete more heat-sensitive species. However, populations of the similar R. maritima in tropical environments may suffer a decline as their productivity will be highly reduced.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Sensitivity of Photosynthesis to Warming in Two Similar Species of the Aquatic Angiosperm Ruppia from Tropical and Temperate Habitats

et al. 2021

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“…Ruppia maritima (including R. cirrhosa, now considered as a heterotypic synonym; but see [111]) is usually restricted to brackish lagoons. There, a highly variable environment induces wide fluctuations in the surface area of the R. maritima meadows.…”

Section: Ruppia Maritimamentioning

confidence: 99%

Restoration of Seagrass Meadows in the Mediterranean Sea: A Critical Review of Effectiveness and Ethical Issues

Boudouresque

Blanfuné

Pergent

et al. 2021

Water

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Some species of seagrasses (e.g., Zostera marina and Posidonia oceanica) have declined in the Mediterranean, at least locally. Others are progressing, helped by sea warming, such as Cymodocea nodosa and the non-native Halophila stipulacea. The decline of one seagrass can favor another seagrass. All in all, the decline of seagrasses could be less extensive and less general than claimed by some authors. Natural recolonization (cuttings and seedlings) has been more rapid and more widespread than was thought in the 20th century; however, it is sometimes insufficient, which justifies transplanting operations. Many techniques have been proposed to restore Mediterranean seagrass meadows. However, setting aside the short-term failure or half-success of experimental operations, long-term monitoring has usually been lacking, suggesting that possible failures were considered not worthy of a scientific paper. Many transplanting operations (e.g., P. oceanica) have been carried out at sites where the species had never previously been present. Replacing the natural ecosystem (e.g., sandy bottoms, sublittoral reefs) with P. oceanica is obviously inappropriate in most cases. This presupposes ignorance of the fact that the diversity of ecosystems is one of the bases of the biodiversity concept. In order to prevent the possibility of seagrass transplanting from being misused as a pretext for further destruction, a guide for the proper conduct of transplanting is proposed.

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“…High phenotypic plasticity to cope with fluctuations in salinity, water level, temperature and irradiance (Verhoeven, 1979;Mannino et al, 2015), together with recurrent hybridizations (Beirinckx et al, 2020), historical misinterpretations and local, incomplete descriptions have complicated Ruppia genus taxonomy and phylogeny (Yu and den Hartog, 2014;den Hartog and Triest, 2020). As a result, Ruppia was thought to consist of only two cosmopolitan species (R. maritima and R. spiralis L. ex Dum.-the latter often cited under R. cirrhosa (Petagna) Grande) whose species range sizes were overestimated (Yu and den Hartog, 2014;den Hartog and Triest, 2020). Yu and den Hartog (2014) described two new (sub-)tropical species in Asia (China) using extensive morphological and molecular features (Yu et al, 2020) i.e., R. brevipedunculata Yu and den Hartog and R. sinensis Yu and den Hartog, which were previously considered as R. maritima and R. cirrhosa, respectively.…”

Section: Introductionmentioning

confidence: 99%

Low Genetic Connectivity of Strongly Inbred Ruppia brevipedunculata in Aquaculture Dominated Lagoons (Viet Nam)

Triest

Dierick

Phan

et al. 2021

Front. Conserv. Sci.

Self Cite

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Lagoonal environments exhibit high levels of instability depending on hydrological, climatic and ecological factors, thereby influencing the distribution and structure of submerged plant communities. Conditions typically fluctuate widely due to the interaction of freshwater from rivers with saltwater from the sea, as well as from aquaculture activities that together influence submerged hydrophyte community spatial and temporal variability depending on plant survival strategies. Ruppia species feature either underwater pollination mediated by an air bubble or by the release of pollen floating at the water surface, the former promoting self-pollination. Tropical Asian Ruppia brevipedunculata Yu and den Hartog was assumed to pollinate below the water surface and identified as a separate lineage among selfed Ruppia taxa. We used nine nuclear microsatellites to estimate inbreeding levels and connectivity of R. brevipedunculata within a large SE Asian lagoon complex. Ruppia brevipedunculata meadows were strongly inbred as could be derived from the many monomorphic or totally fixed loci for unique alleles in different parts of the lagoon, which appears consistent with selfing behavior. Those from aquaculture ponds were highly inbred (FIS = 0.620), though less than open lagoon sites that showed nearly total inbreeding (FIS = 0.942). Ruppia brevipedunculata from two major lagoon parts were highly differentiated with spatially structured gene pools and a strong barrier between parts of the lagoon over a 30 km distance. Migration-n analysis indicated unidirectional though limited gene flow and following potential hydrological connectivity. Overall, private alleles under homozygote conditions explained a stronger genetic differentiation of populations situated inside aquaculture ponds than of open lagoon populations. Kinship values were only relevant up to 5 km distance in the open lagoon. Within a confined area of aquaculture ponds featuring dense vegetation in stagnant water, there would be opportunity for mixed pollination, thereby explaining the higher diversity of unique multilocus genotypes of aquaculture pond habitats. Low connectivity prevents gene pools to homogenize however promoted sites with private alleles across the lagoon. Complex hydrodynamic systems and human-made habitats enclosed by physical structures impose barriers for propagule dispersal though may create refugia and contribute to conserving regional genetic diversity.

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A profound view and discourse on the typification and status of three confused taxa: Ruppia maritima, R. spiralis and R. cirrhosa

Cited by 11 publications

References 26 publications

Sensitivity of Photosynthesis to Warming in Two Similar Species of the Aquatic Angiosperm Ruppia from Tropical and Temperate Habitats

Sensitivity of Photosynthesis to Warming in Two Similar Species of the Aquatic Angiosperm Ruppia from Tropical and Temperate Habitats

Restoration of Seagrass Meadows in the Mediterranean Sea: A Critical Review of Effectiveness and Ethical Issues

Low Genetic Connectivity of Strongly Inbred Ruppia brevipedunculata in Aquaculture Dominated Lagoons (Viet Nam)

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