Effects of temperature, salinity and irradiance on carposporeling development of Hidropuntia caudata (Gracilariales, Rhodophyta)

Miranda, George Emmanuel Cavalcanti de; Yokoya, Nair S.; Fujii, Mutuê T.

doi:10.1590/s0102-695x2012005000079

Cited by 16 publications

(4 citation statements)

References 26 publications

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“…Indeed, even if G. caudata has been described as euryhaline species (Yokoya and Oliveira ), experiments have shown that it was not able to grow at salinities lower than 15 (de Miranda et al. ) and it can be assumed that strong freshwater outflows may have a significant impact on the fitness of these intertidal populations. The possible role of the São Francisco River as a promoter of differentiation has been commonly reported in terrestrial organisms (Pellegrino et al.…”

Section: Discussionmentioning

confidence: 99%

Dual influence of terrestrial and marine historical processes on the phylogeography of the Brazilian intertidal red alga Gracilaria caudata

Ayres-Ostrock

Valéro

Mauger

et al. 2019

Journal of Phycology

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In this study, we explored how past terrestrial and marine climate changes have interacted to shape the phylogeographic patterns of the intertidal red seaweed Gracilaria caudata, an economically important species exploited for agar production in the Brazilian north‐east. Seven sites were sampled along the north‐east tropical and south‐east sub‐tropical Brazilian coast. The genetic diversity and structure of G. caudata was inferred using a combination of mitochondrial (COI and cox2‐3), chloroplast (rbcL) and 15 nuclear microsatellite markers. A remarkable congruence between nuclear, mitochondrial and chloroplast data revealed clear separation between the north‐east (from 03° S to 08° S) and the south‐east (from 20° S to 23° S) coast of Brazil. These two clades differ in their demographic histories, with signatures of recent demographic expansions in the north‐east and divergent populations in the south‐east, suggesting the maintenance of several refugia during the last glacial maximum due to sea‐level rise and fall. The Bahia region (around 12° S) occupies an intermediate position between both clades. Microsatellites and mtDNA markers showed additional levels of genetic structure within each sampled site located south of Bahia. The separation between the two main groups in G. caudata is likely recent, probably occurring during the Quaternary glacial cycles. The genetic breaks are concordant with (i) those separating terrestrial refugia, (ii) major river outflows and (iii) frontiers between tropical and subtropical regions. Taken together with previously published eco‐physiological studies that showed differences in the physiological performance of the strains from distinct locations, these results suggest that the divergent clades in G. caudata correspond to distinct ecotypes in the process of incipient speciation and thus should be considered for the management policy of this commercially important species.

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Section: Discussionmentioning

confidence: 99%

Dual influence of terrestrial and marine historical processes on the phylogeography of the Brazilian intertidal red alga Gracilaria caudata

Ayres-Ostrock

Valéro

Mauger

et al. 2019

Journal of Phycology

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“…For tropical marine macroalgae, lethal and sublethal temperatures have been recorded between 32 °C and 38 °C (Koch et al 2013) (e.g. Miranda et al 2012;Araújo et al 2014;Castro & Yokoya 2019). The maximum temperature tested in this study (32 °C) was not lethal for either species, although their lowest growth was recorded at this temperature.…”

Section: Discussionmentioning

confidence: 99%

Effects of ocean warming, eutrophication and salinity variations on the growth of habitat-forming macroalgae in estuarine environments

2020

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Global change and coastal eutrophication are affecting macroalgae worldwide. We analyzed the effects of increased water temperature (25, 28 and 32 °C) and eutrophication on the growth of Bostrychia binderi and Bostrychia montagnei in a range of salinities (18, 24, 30, 36 and 42 PSU) through three independent multifactorial experiments. Both species had higher growth at 25 °C than at 28 and 32 °C (warming scenario projected by IPCC), suggesting a negative effect of ocean warming. The species showed a broad tolerance to the range of salinities tested, with higher growth at 36 and 42 PSU, as a local adaptation strategy. Oligotrophic seawater significantly affected the growth of both species because the lowest growth was found in this condition, whereas highest growth was found with increased availability of nutrients, which is probably because estuaries are nutrient-rich environments due to continental runoff. High temperatures, low salinities and few nutrients had negative interactive effects on the growth of both species. Our results show that ocean warming can be detrimental to the studied macroalgae, and that both species are tolerant to eutrophication, with B. montagnei being more sensitive than B. binderi. Our results also reinforce the euryhaline characteristic of the genus Bostrychia.

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“…Oliveira (2002: 390) and Hydropuntia caudata (J. Agardh 1852: 598) C.F.D. Gurgel & S. Fredericq (2004: 155), and consequently, the natural populations of these species are reduced to a few individuals who have lost the ability to recover (Miranda et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Molecular identification of the exotic lineage of <i>Kappaphycus alvarezii</i> (Rhodophyta, Solieriaceae) cultivated in the tropical region of Brazil

Araújo¹,

Miranda²,

Barros-Barreto³

et al. 2013

Phytotaxa

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Kappa carrageenan is an important phycocolloid extracted from the red seaweed Kappaphycus alvarezii. This species has been introduced into several regions, most recently in Brazil. The remote invasive potential of this seaweed in both south and southeast waters of Brazil (subtropical regions) has been established, but introduction in the northeastern tropical area is contested due to the absence of biological information. An unknown exotic lineage of K. alvarezii has been illegally introduced and cultivated in an area characterized by the presence of coral reefs in Paraíba, the northeastern Brazilian coast, since the beginning of the last decade. This work focuses on the molecular identification of these samples in comparison with sequences of other strains of K. alvarezii and congeners available in Genbank. Maximum likelihood (ML) and Bayesian inference (BI) analyses showed strong similarities between K. alvarezii cultivated in the tropical waters in Brazil and those lineages cultivated in Hawaii, Venezuela, Malaysia and Tanzania that have never shown invasive behavior. However, more detailed investigations and use of environmental monitoring are recommended before commercial cultivation of this species can be authorized in tropical region of Brazil.

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Effects of temperature, salinity and irradiance on carposporeling development of Hidropuntia caudata (Gracilariales, Rhodophyta)

Cited by 16 publications

References 26 publications

Dual influence of terrestrial and marine historical processes on the phylogeography of the Brazilian intertidal red alga Gracilaria caudata

Dual influence of terrestrial and marine historical processes on the phylogeography of the Brazilian intertidal red alga Gracilaria caudata

Effects of ocean warming, eutrophication and salinity variations on the growth of habitat-forming macroalgae in estuarine environments

Molecular identification of the exotic lineage of <i>Kappaphycus alvarezii</i> (Rhodophyta, Solieriaceae) cultivated in the tropical region of Brazil

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