Structure of a Bed of <i>Gracilaria </i>spp. (Rhodophyta) in Northeastern Brazil

Silva, R. L.; Pereira, Sônia Maria Barreto; Fo., E. C. de Oliveira; Eston, Verena Rapp de

doi:10.1515/botm.1987.30.6.517

Cited by 32 publications

(29 citation statements)

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“…The salinity values obtained in laboratory experiment also coincide with the values found in the region where the H. caudata population was collected, with a salinity level of approximately 36 psu, but that can decrease to 20 psu during the rainy season (Silva et al, 1987). The tolerance limits for carposporeling growth of H. caudata presented discrete differences when compared to the results obtained by Yokoya & Oliveira (1993) for a distinct population of the same species collected from southeastern Brazil, especially for the lower limit (20 psu) and for the optimal growth level (25 psu).…”

Section: Discussionsupporting

confidence: 80%

“…Hidropuntia caudata is abundant in tropical waters of the western Atlantic Ocean and occurs along the Brazilian coast (Joly et al, 1963;Silva et al, 1987;Plastino & Oliveira, 1997;Oliveira, 1998;Oliveira & Miranda, 1998;Chow et al, 2007). It is found in clear to turbid water in the mid-littoral zone or infra-littoral fringe, commonly buried in sand, and has a cylindric erect branched thallus, which can reach more than 30 cm high (Plastino & Oliveira, 1997).…”

Section: Introductionmentioning

confidence: 99%

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

Miranda

Yokoya

Fujii

2012

Rev. bras. farmacogn.

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Abstract:The success of seaweed cultivation depends on the scientific control of the tolerance limits and the optimal physiological conditions that affect the spore germination and the early development of algal species. In order to establish cultivation techniques for spores of Hidropuntia caudata (J. Agardh) Gurgel & Fredericq, the effects of irradiance, salinity, and temperature on the carpospore germination and carposporeling development were evaluated under laboratory conditions. Five photon flux densities (PFD, from 18 to 200 µmol photons m -2 s -1 ), six salinity values (from 7 to 55 psu), and four temperatures (from 20 ºC to 35 ºC) were investigated. The level of irradiance caused significant differences in the growth, in the following order: 200±5 > 100±5 = 62.5±2.5 > 30±1.5 > 18±1 µmol of photons m -2 s -1 , but they did not inhibit the carposporeling development. Maximum growth occurred under 35 psu, while at 15 psu the formation of carposporeling erect axis was limited. The optimal temperature for growth was 25 ºC, while at 35 ºC the spores died. These results show the importance of previous knowledge on the tolerance limits and optimal conditions for sporeling development of H. caudata for the implementation of an aquaculture program.

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Section: Discussionsupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

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

Miranda

Yokoya

Fujii

2012

Rev. bras. farmacogn.

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“…In their study of algal communities at Itamaracá, PE Silva et al (1987) reported lower Gracilaria biomass values during the rainy season than during the dry summer season that could be related to water turbidity, rainfall, and wind dispersion. Principal Component Analyses Hypnea biomass was sensitive to a 10% decrease in its optimum temperature in the models.…”

Section: Discussionmentioning

confidence: 92%

Modeling temporal variations of Gracilaria Greville and Hypnea J.V. Lamouroux (Rhodophyta) assemblages on a midlittoral reef platform at Piedade Beach, Pernambuco State, Brazil

Guimaraens¹,

Macêdo²,

Oliveira-Carvalho³

et al. 2012

Braz. J. Bot.

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-(Modeling temporal variations of Gracilaria Greville and Hypnea J.V. Lamouroux (Rhodophyta) assemblages on a midlittoral reef platform at Piedade Beach, Pernambuco State, Brazil). The diversity of algal banks composed of species out the genera Gracilaria Greville and Hypnea J.V. Lamouroux have been impacted by commercial exploitation and coastal eutrophication. The present study sought to construct dynamic models based on algal physiology to simulate seasonal variations in the biomasses of Gracilaria and Hypnea an intertidal reef at Piedade Beach in Jaboatão dos Guararapes, Pernambuco State, Brazil. Five 20 × 20 cm plots in a reef pool on a midlittoral reef platform were randomly sampled during April, June, August, October, and December/2009 and in January and March/2010. Water temperature, pH, irradiance, oxygen and salinity levels as well as the concentrations of ammonia, nitrate and phosphate were measured at the sampling site. Forcing functions were employed in the model to represent abiotic factors, and algal decay was simulated with a dispersal function. Algal growth was modeled using a logistic function and was found to be sensitive to temperature and salinity. Maximum absorption rates of ammonia and phosphate were higher in Hypnea than in Gracilaria, indicating that the former takes up nutrients more effi ciently at higher concentrations. Gracilaria biomass peaked at approximately 120 g (dry weight m -2 ) in March/2010 and was signifi cantly lower in August/2009; Hypnea biomasses, on the other hand, did not show any signifi cant variations among the different months, indicating that resource competition may infl uence the productivity of these algae.

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“…Algae can be found in association with other biological systems, especially coral reefs (HAY, 1981;SILVA et al, 1987), mussel beds (ALBRECHT, 1998), and seagrass meadows (ZIEMAN; ZIEMAN, 1989;BOROWITZKA et al, 2006). Both positive and negative effects of seagrass-algae relationships are reported in the literature (SAND-JENSEN, 1977;SILBERSTEIN et al, 1986;WILLIAMS, 1990;CINELLI, 1997CINELLI, , 1998CINELLI, , 1999ASMUS, 2001;BRUN et al, 2003;TAPLIN et al, 2005;STAFFORD;BELL, 2006;PERGENT et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

“…Most studies on algae associated with seagrasses have focused on species composition (HAY, 1981;PEDRINI;SILVEIRA, 1985;SILVA et al, 1987;PEDRINI et al, 1997;PAULA et al, 2003;BARRIOS;DÍAZ, 2005), biomass (PEDRINI; SILVEIRA, 1985;SILVA et al, 1987;PAULA et al, 2003), spatial distribution (SILVA et al, 1987;PAULA et al, 2003;PEDRINI et al, 1997) and temporal distribution (PEDRINI et al, 1997) of macroalgae attached to seagrasses (PEDRINI;SILVEIRA, 1985;SILVA et al, 1987;PEDRINI et al, 1997;HAYS, 2005) or co-habitants (HAY, 1981;PAULA et al, 2003). Other studies have observed the habit of the algae on seagrasses (BIBER et al, 2004), trophic interactions (BOROWITZKA et al, 1990;LEPOINT et al, 2000;HAYS, 2005) or environmental influences on the seagrass-algae complex (PLUS et al 2001).…”

Section: Introductionmentioning

confidence: 99%

Influence of the shoot density of Halodule wrightii Ascherson from rocky and sandy habitats on associated macroalgal communities

et al. 2013

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A B S T R A C TThis study evaluated the influence of the shoot density of the shoal grass Halodule wrightii on the composition of the associated algal community, in rocky and sandy habitats on the coast of Ceará in northeastern Brazil. The phycological community included 18 species in 10 families, members of Rodophyta (72.2%), Chlorophyta (22.2%) and Phaeophyceae (5.5%). The largest proportion were epilithic (50%), followed by epiphytes on H. wrightii (38.4%), epipsammics (8%), and epiphytes on other algae (4%). Epiphytes on H. wrightii occurred mainly associated with rhizomes, but also tendrils of H. musciformis occurred attached to the leaves. The phycological community varied according to the density of H. wrightii, independently of particular characters of the meadows, although both habitat and other environmental variables seemed to influence the macroalgae composition and diversity. The rocky habitat was more diverse than the sandy habitat, but in the sandy habitat the shoal grass was important for algal settlement in areas where hard substrates were scarce or absent. R E S U M OEste estudo avaliou a influência da densidade do capim-agulha Halodule wrightii sobre a composição da comunidade algal associada, em habitats rochosos e arenosos da costa do Ceará, Nordeste do Brasil. A comunidade ficológica incluiu 18 espécies em de 10 famílias, integrantes de Rodophyta (72.2%), Chlorophyta (22.2%) e Phaeophyceae (5.5%). A maior proporção foi epilítica (50%), seguida pelas epífitas de H. wrightii (38.4%), epífitas de outras algas (8%) e epipsâmicas (4%). Epífitas de H. wrightii ocorreram associadas com os rizomas, mas gavinhas de H. musciformis ocorreram presas às folhas. A comunidade ficológica variou de acordo com a densidade de H. wrightii independentemente das características particulares dos prados estudados, embora tanto o habitat quanto outras variáveis ambientais pareceram influenciar a composição e diversidade das macroalgas. O habitat rochoso foi mais diverso que o arenoso, mas no habitat arenoso o capimagulha foi importante para o assentamento de algas em áreas onde substratos duros foram raros ou ausentes.

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Structure of a Bed of Gracilaria spp. (Rhodophyta) in Northeastern Brazil

Cited by 32 publications

References 5 publications

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

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

Modeling temporal variations of Gracilaria Greville and Hypnea J.V. Lamouroux (Rhodophyta) assemblages on a midlittoral reef platform at Piedade Beach, Pernambuco State, Brazil

Influence of the shoot density of Halodule wrightii Ascherson from rocky and sandy habitats on associated macroalgal communities

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