Seasonal variations in growth and reproduction of Sargassum orotavicum (Fucales, Phaeophyceae) from the Canary Islands

Díaz-Villa, Tania; Sansón, Marta; Afonso-Carrillo, Julio

doi:10.1515/bot.2005.003

Cited by 15 publications

(10 citation statements)

References 19 publications

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“…Grazers of S. muticum most probably have to be more generalists enabling them to switch to other seaweed species during the time of year when S. muticum is practically absent. Pseudo-perennial life histories are common in Sargassum species and have been documented for tropical, subtropical and temperate species (e.g., Paula & Oliveira, 1982;Wernberg et al, 2000;Diaz-Villa et al, 2005;Engelen et al, 2005) and are not exclusively for invasive Sargassum species.…”

Section: Discussionmentioning

confidence: 99%

Mesograzers prefer mostly native seaweeds over the invasive brown seaweed Sargassum muticum

et al. 2011

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Introduced algae form globally an increasing problem. Grazing on invaders could provide communities with resistance to algal invasions. In this study, we experimentally tested the food choice of mesoherbivores for native macroalgae versus the invader Sargassum muticum. We performed food choice experiments with common grazers (Gammarus insensibilis, Hydrobia ulvae and Stenosoma nadejda) and both the brown algal invader Sargassum muticum and its native macroalgal competitors, from both the south (Cystoseira humilis, Stypocaulon scoparium, Cladostephus spongiosus, Dictyota dichotoma, Dictyopteris polypodioides, Sargassum vulgare) and southwest (Cystoseira humilis) coast of Portugal. We tested whether (i) the invader affects the growth rates of native macro algae, and (ii) the grazers have a food preference for S. muticum compared to native macroalgae. The presence of S. muticum did not affect the growth rates of any of the native species. Grazers affected the growth rate of all seaweeds, but S. muticum had the highest growth rates with and without grazers. For the south coast set of species, Stypocaulon scoparium was the most and S. muticum was the least or among the least preferred by grazers. The grazers from the southwest coast did not show a specific preference for C. humilis or S. muticum. Contrary to our expectations the food choice of mesoherbivores may provide S. muticum with some competitive advantage on the Portuguese south coast, but this may not be applicable to the Southwest communities.

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Section: Discussionmentioning

confidence: 99%

Mesograzers prefer mostly native seaweeds over the invasive brown seaweed Sargassum muticum

et al. 2011

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“…Sargassum sinicola was even reproductive in autumn at the head of the gulf (McCourt 1985). Spring and summer are common periods for the reproduction of Sargassum species (Kendrick & Walker 1994;Arenas & Fernandez, 1998;Yoshida et al 2004;Diaz-Villa et al 2005).…”

Section: Reproductive Structuresmentioning

confidence: 99%

“…Given the ecological and economic importance of Sargassum beds, studies on their population ecology have been performed worldwide. Thus, reproduction, dispersal, recruitment, growth, and mortality have been investigated for a number of species (McCourt 1984;Ang 1985a;Kendrick & Walker 1994;Gillespie & Critchley 1999;Stiger & Payri 1999;Arenas et al 2002;Wong & Phang 2004;Yoshida et al 2004;Diaz-Villa et al 2005;Engelen et al 2005). However, on several occasions these aspects were studied more or less independently from each other.…”

Section: Introductionmentioning

confidence: 99%

Population dynamics of Sargassum lapazeanum (Fucales, Phaeophyta) from the Gulf of California, Mexico

Rivera¹,

Scrosati²

2006

Phycologia

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We studied the population dynamics of Sargassum iapazeanum from the southwestern Gulf of California, Mexico, between February 2000 and February 2001. We quantified the seasonal changes in frond density, stand biomass, frond size structure and inequality, presence of reproductive structures, and rates of recruitment, growth, and mortality. Fronds were present during the entire year, although with a marked seasonality: mean frond density, frond length, and stand biomass were highest in spring and lowest in winter. The strong increase in frond density between winter and spring resulted from the combination of high recruitment and low mortality rates. Growth rates were highest in spring; the highest absolute value (3.6 cm d"') is among the highest found for brown seaweeds. The frond size structure became best developed in late spring. Reproductive structures peaked in abundance in late spring and became mostly lost by late summer. Senescence started in late spring and increased dramatically during the summer. The strong decrease in frond density between summer and autumn resulted from the combination of low recruitment and high mortality rates. In early autumn, primarily only small fronds remained in the population, including new recruits and remnants of previously large fronds. The seasonal pattern in the temporal abundance changes for S. lapazeanum agrees with a general model proposed for subtropical species of this genus.

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“…The height (H, cm), fresh weight (W, g), stem diameter (SD, cm), branch number (BN), and crown width (D, cm) were measured for each sample. The blades, stems, and receptacles were dissected using tweezers, classified, numbered, and placed into an oven for drying at 100 • C for 24 h to a constant weight [29]. The blades were clavate, and the tops were often inflated and changed into pneumatocysts [27].…”

Section: Methodsmentioning

confidence: 99%

Allometric Growth of Sargassum fusiforme (Ochrophyta, Fucales) Organs in the Maturation Period Based on Biomass Analysis of Samples from Gouqi Island

Wang

Chen

et al. 2021

JMSE

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Sargassum fusiforme is a seaweed species that plays an important role in the diverse communities of the flora and fauna of coastal food webs. Assessments of its biomass and energy allocation in addition to allometric organ growth have important ecological value for understanding the community structure, carbon storage, and resource assessment of seaweed beds during periods in which they thrive. In this study, the morphology of Sargassum fusiforme and the biomass of organs and total organisms in the maturation period were studied, and the allometric relationships for different organs of Sargassum fusiforme were analyzed using the standardized major axis (SMA). In the maturation period of Sargassum fusiforme, branch number, height × stem diameter were the prior independent variables, and the optimum biomass was y = 0.002x1.107 (R2 = 0.923). The biomass allocation ratio of blades was the highest (38.33%), followed by stems (32.90%) and receptacles (28.77%). The growth rates of the various organs were found to differ, and the rate of biomass increase for the blades and stems tended to converge. The rate of receptacle biomass growth of Sargassum fusiforme was the highest in the maturation period, and the rate of organ biomass increase was Wb < Ws < Wt < Wr, which reflects the trade-off with energy allocation as a strategy used by Sargassum fusiforme.

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Seasonal variations in growth and reproduction of Sargassum orotavicum (Fucales, Phaeophyceae) from the Canary Islands

Cited by 15 publications

References 19 publications

Mesograzers prefer mostly native seaweeds over the invasive brown seaweed Sargassum muticum

Mesograzers prefer mostly native seaweeds over the invasive brown seaweed Sargassum muticum

Population dynamics of Sargassum lapazeanum (Fucales, Phaeophyta) from the Gulf of California, Mexico

Allometric Growth of Sargassum fusiforme (Ochrophyta, Fucales) Organs in the Maturation Period Based on Biomass Analysis of Samples from Gouqi Island

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