Reproductive Allocation and Strategy of Sargassum elegans Suhr and Sargassum incisifolium (Turner) C. Agardh from Reunion Rocks, KwaZulu-Natal, South Africa

Gillespie, R. D.; Critchley, Alan T.

doi:10.1515/bot.2001.030

Cited by 10 publications

(16 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…By removing either vegetative stems or reproductive structures in Sargassum thunbergii, Chu et al (2011) demonstrated a trade-off between vegetative growth and reproduction. This study confirmed older observations by McCourt (1985) and Gillespie and Critchley (2001) of an inverse correlation between vegetative growth and reproductive effort among different Sargassum species in the Gulf of California and South Africa, respectively. Focusing on the commercial red alga Gracilaria chilensis, Guillemin et al (2014) provided strong evidence for reproductionassociated costs.…”

Section: Age and Sizesupporting

confidence: 91%

Seaweed reproductive biology: environmental and genetic controls

et al. 2017

View full text Add to dashboard Cite

Knowledge of life cycle progression and reproduction of seaweeds transcends pure academic interest. Successful and sustainable seaweed exploitation and domestication will indeed require excellent control of the factors controlling growth and reproduction. The relative dominance of the ploidy-phases and their respective morphologies, however, display tremendous diversity. Consequently, the ecological and endogenous factors controlling life cycles are likely to be equally varied. A vast number of research papers addressing theoretical, ecological and physiological aspects of reproduction have been published over the years. Here, we review the current knowledge on reproductive strategies, trade-offs of reproductive effort in natural populations, and the environmental and endogenous factors controlling reproduction. Given that the majority of ecophysiological studies predate the "-omics" era, we examine the extent to which this knowledge of reproduction has been, or can be, applied to further our knowledge of life cycle control in seaweeds.

show abstract

Section: Age and Sizesupporting

confidence: 91%

Seaweed reproductive biology: environmental and genetic controls

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Although we did not measure reproductive allocation as such (see e.g. Gillespie & Critchley 2001), our data do not support the existence of a direct trade-off between reproduction and growth in S. ilicifolium. We found no significant difference in the growth rate of fertile and sterile laterals.…”

Section: Possible Trade-off Between Growth and Reproductioncontrasting

confidence: 72%

“…The existence of such a trade-off has been reported for Sargassum and other fucoid algae (e.g. McCourt 1985, Ang 1992, Åberg 1996, Gillespie & Critchley 2001). Although we did not measure reproductive allocation as such (see e.g.…”

Section: Possible Trade-off Between Growth and Reproductionmentioning

confidence: 73%

Seasonal dynamics of Sargassum ilicifolium (Phaeophyta) on a shallow reef flat in the southern Red Sea (Eritrea)

Ateweberhan¹,

Bruggemann²,

Breeman³

2005

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

The seasonality of Sargassum ilicifolium was studied in the southern Red Sea by monitoring thallus density, thallus size and the initiation, growth, reproduction and survivorship of primary laterals. Thallus density showed slight but significant seasonal variation; it was highest at the end of the hot season and lowest at the end of the cold season. Mean thallus and lateral lengths peaked in the second half of the cold season. Initiation of new laterals was highest in the first half of the cold season. High lateral densities suppressed new lateral initiation. In the first month after initiation, laterals grew out to the same length as those formed earlier in the year. Thus, elongation rates of young laterals were highest during the period of maximum canopy height. In older laterals, growth rates decreased with length, due to increased tissue loss. Growth rates were independent of reproductive status. Reproduction occurred in the second half of the cold season and was independent of lateral size, but laterals had to be at least 1 to 2 mo old before reproducing. Highest loss rates of laterals occurred at the end of the growth season. Survivorship was independent of lateral size or reproductive status. Loss rates were lowest in the hot season. We conclude that there is no direct trade-off between reproduction and growth/survival of the laterals, and that the dynamics of S. ilicifolium are directly related to the seasonal extremes in environmental conditions. Morphogenetic responses at the level of individual laterals also contribute to the overall phenological pattern.

show abstract

“…The trade-off in resource allocation between reproduction and other functions (e.g. survival and growth) in Sargassum and many other fucoid algae has been reported by various authors (McCourt, 1985;Ang, 1992;Å berg, 1996;Gillespie & Critchley, 2001). However, no direct trade-off was found between reproduction and growth in populations of Sargassum ilicifolium, Turbinaria triquetra, and S. subrepandum, as reported by Ateweberhan et al (2005Ateweberhan et al ( , 2006Ateweberhan et al ( , 2008.…”

Section: Introductionmentioning

confidence: 78%

Trade-off between vegetative regeneration and sexual reproduction of Sargassum thunbergii

et al. 2011

View full text Add to dashboard Cite

An ecological demographic study was conducted from January to December 2009 at Changshan Island on the northern side of Shandong Peninsula, China. The study investigated stem regeneration and the resource trade-off between sexual reproduction and vegetative regeneration of the brown alga Sargassum thunbergii at the individual thallus level. Stem regeneration from the holdfast occurred year round but with significant seasonality, peaking in the early summer. Both percentage of fertile stems and reproductive effort were negatively correlated with stem regeneration in the middle and later periods of sexual reproduction. Furthermore, the correlation coefficients increased significantly with time. These observations suggested that an increase in resource allocation to sexual reproduction would lead to a decrease in allocation to vegetative regeneration during the reproductive period. Reproductive effort was lower and stem regeneration was higher in the wave-exposed location compared with the sheltered location, indicating that allocation of resources between sexual reproduction and vegetative regeneration varied with location. When reproductive tissues were removed, the number of new stems produced from holdfasts increased, and when new stems were removed, an increase in reproductive effort occurred. These results suggest that trade-off between sexual reproduction and vegetative regeneration occurs in S. thunbergii.

show abstract

Reproductive Allocation and Strategy of Sargassum elegans Suhr and Sargassum incisifolium (Turner) C. Agardh from Reunion Rocks, KwaZulu-Natal, South Africa

Cited by 10 publications

References 16 publications

Seaweed reproductive biology: environmental and genetic controls

Seaweed reproductive biology: environmental and genetic controls

Seasonal dynamics of Sargassum ilicifolium (Phaeophyta) on a shallow reef flat in the southern Red Sea (Eritrea)

Trade-off between vegetative regeneration and sexual reproduction of Sargassum thunbergii

Contact Info

Product

Resources

About