Influência de fatores ambientais sobre o crescimento in vitro de Hypnea musciformis (Wulfen) Lamouroux (Rhodophyta)

Bravin, Isolda Cecília; Yoneshigue‐Valentin, Yocie

doi:10.1590/s0100-84042002012000011

Cited by 21 publications

(6 citation statements)

References 21 publications

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“…These differences of activities between the extracts can be explained by the different abiotic conditions in which the seaweed grew such as, temperature, nutritional conditions and salinity of the water. This strengthens the theory of BRAVIN & YONESHIGUE-VALETIN that environmental factors are able to influence the production of the compounds of the marine algae 6 , since these conditions vary from one place of collection to another.…”

Section: Discussionsupporting

confidence: 84%

“…It is known that environmental factors intervene with the production of the biomass of marine algae 6 and, it is believed that these factors can also influence the production of bioactive components in these algae and, influence its biological activities 32,36,44,52 . Therefore extracts of U. fasciata collected from different regions were tested.…”

Section: Discussionmentioning

confidence: 99%

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Antiviral activity of the green marine alga Ulva fasciata on the replication of human metapneumovirus

Mendes

Soares

Martins

et al. 2010

Rev. Inst. Med. trop. S. Paulo

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SUMMARYWe evaluated the antiviral activity of the marine alga, Ulva fasciata, collected from Rasa beach and Forno beach, Búzios, Rio de Janeiro, Brazil on the replication of human metapneumovirus (HMPV). The algae extracts were prepared using three different methodologies to compare the activity of different groups of chemical composites obtained through these different methodologies. Four out of the six extracts inhibited nearly 100% of viral replication. The results demonstrated that the majority of the extracts (five out of six) possess virucidal activity and therefore have the ability to interact with the extracellular viral particles and prevent the infection. On the other hand, only two extracts (from Forno beach, obtained by maceration and maceration of the decoction) were able to interact with cell receptors, hindering the viral entry. Finally, only the extract of algae collected at Forno beach, obtained by maceration presented intracellular activity. To our knowledge, this is a pioneer study on antiviral activity of marine algae against HMPV. It is also the first on antiviral activity against HMPV ever done in Brazil. The study also shows the effect of different environment factors and different chemical procedures used to obtain the extract on its biological properties.

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Section: Discussionsupporting

confidence: 84%

Section: Discussionmentioning

confidence: 99%

Antiviral activity of the green marine alga Ulva fasciata on the replication of human metapneumovirus

Mendes

Soares

Martins

et al. 2010

Rev. Inst. Med. trop. S. Paulo

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“…Such recruitment patterns probably also occur on S. cymosum fronds. For the epiphytic algae, the epibiosis narrowly followed the S. cymosum patterns (see Reis et al , 2003), showing that shading due to turbidity and temperature may also influence the seasonal life cycle of these algae (see Bravin & Yoneshigue-Valentin, 2002 for experiments of environmental factors on H. musciformis ).…”

Section: Discussionmentioning

confidence: 99%

Influence of a narrow depth gradient and season on the morphology, phenology, and epibiosis of the brown algaSargassum cymosum

et al. 2010

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Temporal and spatial fluctuations of environmental parameters are normally assigned as causes of variations in morpho-phenological characters of seaweeds and in their epibionts, but formal tests of such hypotheses are lacking, especially in narrow gradients. The present study evaluated the influence of a very small depth gradient (1 to 3 m) and of subtle seasonality characteristic of tropical areas on morpho-phenological traits and on the occurrence of sessile epiphytic organisms using a controlled orthogonal sampling design in a sublittoral population of the tropical brown alga Sargassum cymosum. Four temporal samples were obtained over a one-year period at three depths using nine replicates. The wet weight, maximum length, number of primary and secondary branches, and proportion of secondary branches with receptacles were recorded. Epibiosis was estimated by visual evaluation of percentage cover on secondary branches. Algal morphology varied as a function of the period of the year (weaker effect) and depth (stronger effect) but in different ways for each variable analysed. In general, fronds tended to be shorter, heavier, and more ramified in shallower areas. In relation to time, the morphological characters tended mostly to present higher values in January (summer) and/or April (autumn). Frequency of receptacles did not depend on algal morphology and depth at all but varied in time, although only in the deepest area. Epibiosis also did not depend on algal morphology but varied in relation to time (stronger effect) and, to a lesser extent, depth (weaker effect). The effect of time upon epibiosis also depended on the biological group analysed. These data support the hypothesis that algal morphology varies in relation to period of the year and depth, even under small temporal and spatial environmenal gradients.

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“…Since food is not considered as limiting factor for epiphyte herbivorous species, space must be elected. As epiphytic macroalgae commonly grows faster than host macroalgal (Bravin and Yoneshigue-Valentin, 2002) mesograzers such as amphipods play a role in epibiosis control and in shaping the landscape by a top-down control upon host and epiphytic algae (Jabocucci et al, 2008).…”

Section: Discussionmentioning

confidence: 99%

Ecological model of competitive interaction among three species of amphipods associated to Bryocladia thrysigera (J. Agardh) and extreme environmental stress effects

Flynn

Pereira

2013

Nauplius

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-Population rates of the three dominant amphipod species (Hyale nigra, Caprella danileviskii and Caprella penantis) associated to Bryocladia thrysigera, were calculated revealing similar values for the intrinsic growth rate. The empirical data modeled presented a good fit to the May-Leonard three-species competition model in a discrete Ricker form with periodic cycles for the carrying capacity. In adjusting model to data, a new method to calculate competition coefficients emerged in good agreement with ecological and behavior particularities. A simulation of environmental stochasticity was achieved by the insertion of random parameters for the calculation of each species carrying capacity. H. nigra presented a persistent behavior in extreme environmental stress, whereas C. penantis is highly sensitive to stress.

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Influência de fatores ambientais sobre o crescimento in vitro de Hypnea musciformis (Wulfen) Lamouroux (Rhodophyta)

Cited by 21 publications

References 21 publications

Antiviral activity of the green marine alga Ulva fasciata on the replication of human metapneumovirus

Antiviral activity of the green marine alga Ulva fasciata on the replication of human metapneumovirus

Influence of a narrow depth gradient and season on the morphology, phenology, and epibiosis of the brown algaSargassum cymosum

Ecological model of competitive interaction among three species of amphipods associated to Bryocladia thrysigera (J. Agardh) and extreme environmental stress effects

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