Managing wild crops of Gracilaria in central Chile

Santelices, B.; V�squez, Julio A.; Ohme, U.; Fonck, Erika

doi:10.1007/bf00027643

Cited by 37 publications

(17 citation statements)

References 9 publications

(5 reference statements)

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“…The turf species may be taxonomically close and/or belong to the same functional-form groups and to have morphological, anatomical and reproductive attributes that allow them to tolerate the accumulation of sediments (Airoldi, 2003). Some branched species have apical meristems that keep cell division; also regenerate their erect portions from the remaining holdfast resistant to burial as Pterocladiella capillacea (as Pterocladia capillacea in Stewart, 1983), and Gracilariopsis lemaneiformis (Santelices et al, 1984). The presence of filamentous species in this study coincides with other temperate and tropical coasts influenced by high sediment input as Galapagos (Kendrick, 1991); Hawaii (Cheroske et al, 2000); Italy (Airoldi et al, 1996;Piazzi & Cinelli, 2001); the North Atlantic, North Pacific and Caribbean (Steneck & Dethier, 1994).…”

Section: Discussionsupporting

confidence: 74%

Structure and temporal dynamic of tropical turf forming macroalgal assemblages of the western coast of Mexico

Lopez

Candelaria

Ramı́rez-Garcı́a

et al. 2017

lajar

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ABSTRACT. The study of the structure and dynamics of assemblages of benthic organisms has gained interest in recent decades because it can account for the influence of anthropogenic activities in the coastal zone and be incorporated into management and conservation plans. The region of Zihuatanejo, Mexico, has had an accelerated and unplanned urban development, negatively affecting coastal communities. However, studies on the structure and dynamics of algal assemblages, as well as some of the predominant physical factors in this region are scarce. The objective of this research was to carry out a preliminary study on the structure of macroalgal assemblages and their spatio-temporal variation in a depositional environment. The work was realized from June 2006 to December 2008 collecting randomly macroalgal samples and placing sediment traps on the bottom to characterize the deposition environment. The subtidal algal assemblages of the studied localities were predominantly turfs. The Detendred Correspondence Analysis showed that each locality had a particular species composition. The highest biomass was 37.82 ± 12.90 g dw m -2 and the lowest of 0-7.86 g dw m -2. The highest total sedimentation rate was 1818.10 ± 82.11 g dw m -2 day -1 and the lowest was 58.82 ± 8.75 g dw m -2 day -1 . Significant differences were found in calcareous and articulated biomass, as well as in fine, coarse and total sedimentation rates among localities. The results obtained provide a basis for further research on the effects of sedimentation on the subtidal macroalgae assemblages of the study region.

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Section: Discussionsupporting

confidence: 74%

Structure and temporal dynamic of tropical turf forming macroalgal assemblages of the western coast of Mexico

Lopez

Candelaria

Ramı́rez-Garcı́a

et al. 2017

lajar

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“…The decomposition rates of C. fragile and A. subulata was also high compared to numerous other red and green algae (Bourgues et al 1996, Kamermans et al 1998, Santelices et al 1984, Trowbridge 1996a. It is noteworthy that C. fragile decomposed faster than U.…”

Section: Burial Effectsmentioning

confidence: 83%

Macroalgal Distribution Patterns and Ecological Performances in a Tidal Coastal Lagoon, with Emphasis on the Non-indigenous Codium Fragile ssp. Tomentosoides

Thomsen¹

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Codium fragile ssp. tomentosoides is a North-West Pacific macroalgae that has invaded numerous lagoons. The success of C. fragile has been explained by its dispersal capacity, growth rate, nutrient uptake, salinity and temperature tolerances, and grazer resistance. I compared distribution, recruitment and growth of Codium to native algae in Hog Island Bay, a shallow water lagoon in Virginia. To determine the extent of invaded habitats algae were mapped from 1998-02. Codium was fourth most abundant, and hence considered successful compared to most species in terms of its biomass. Codium was found both unattached or attached to bivalve shells, while the majority of the dominant Gracilaria verrucosa and Ulva curvata were incorporated into tube caps of the polychaete Diopatra cuprea. Preference experiments showed that Diopatra incorporated Ulva and Gracilaria most, Agardhiella subulata intermediate, and Codium and Fucus vesiculosus least, and that the first 3 species were fragmented in the process. Thus, Diopatra facilitated Ulva and Gracilaria, by providing an abundant substrate, reducing flushing and maintaining a supply of fragments for regrowth. Tidal lagoons are characterized by sedimentation, desiccation, high turbidity, and high abundance of molluscan grazers. Short-term experiments showed that Codium was inferior under such conditions compared to Gracilaria, Ulva, Hypnea musciformis, and Agardhiella, decomposing faster when buried, being susceptible to desiccation, growing slower at high and low levels of nutrient and light, and being the only species grazed by Ilyanasa obsolata. To test if the success of Codium fragile could be related to its ability to colonize hard substrate, recruitment bricks were incubated in the shallow subtidal with ii ii and without a cover of unattached algae or sediments. Codium recruited well onto control bricks, but not onto bricks covered by algae or sediments. After one year Codium, Gracilaria, Crassostrea virginica (oyster) and Agardhiella were space-dominants, having tolerated temperature regimes of 2-28ºC and desiccation at low spring tides. Thus Codium is only successful compared to native species by having moderate growth over a long season, and by being an effective colonizer of hard substrate in the shallow subtidal zone in the absence of high sedimentation or drift algae accumulations.

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“…Biomass of vegetatively reproducing Gracilarioid populations have been found to be, spatially, very variable (Santelices et al, 1984;Silva et al, 1987 andBoraso de Zaixso, 1989). The growth pattern viz.…”

Section: Discussionmentioning

confidence: 97%

“…The extent of the underground system rather than the biomass m -2 of the erect thalli is more important in understanding the recruitment of the system since erect thalli that break free no longer play a role in increasing the total biomass unless reattachment occurs (Santelices et al, 1984). Biomass estimates of freely drifting material in this system are of little use.…”

Section: Discussionmentioning

confidence: 99%

“…Again in Chile, Gracilaria chilensis Bird McLachlan et Oliveira ) was found to grow on muddy substrata in Bahia la Herradura and Bahia Tongoy (Santelices et aL, 1984). In these beds surface biomass was found to be very variable but the underground thallus system, which gave rise to erect thalli (Santelices & Ugarte, 1987), was found to be relatively constant (Santelices & Doty, 1989).…”

Section: Introductionmentioning

confidence: 96%

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Distribution, biomass and production of Gracilaria in Lüderitz Bay, Namibia

Molloy

Bolton

1995

J Appl Phycol

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The extent and biomass of the Gracilaria beds in the Luderitz Bay area, Namibia were surveyed in winter and summer. The beds covered most of the suitable sediments available (grain size 106-212 gm) and did not occur in water shallower than 1 m or deeper than 11 m. Total surface area, most of which occurred in the Bay system, changed very little from winter to summer but biomass increased by 3.5 fold. In winter, total Gracilaria biomass was 200 t and 650 t and in summer, 150 t and 2850 t respectively in the Lagoon and Bay. Maximum biomass occurred at 3-4 m in the Lagoon and 5-6 m in the Bay in both winter and summer. Gracilaria beach cast data from 1987 to 1991 for the area were analysed for seasonality and, depending on the specific site, correlated with swell, southerly wind velocity and sea temperature. Beach cast in the Lagoon system is a more continuous process than in the Bay, where beach casts at most sites follow an annual pattern. Wind driven currents and chop were the most important causative parameters of beach cast in the Lagoon whereas the depth at which the plants were growing and swell were more important in the Bay system. The two systems viz. Lagoon and Bay are independent of one another with very little or no exchange of Gracilaria between them. This was evidenced by the similar percentage each contributes to the total beach cast and the similar pattern of beach cast from year to year. The decrease in total beach cast from 1989 to the end of the study period was attributed to a trend towards increasing swell height and low sea temperatures in 1991.

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Managing wild crops of Gracilaria in central Chile

Cited by 37 publications

References 9 publications

Structure and temporal dynamic of tropical turf forming macroalgal assemblages of the western coast of Mexico

Structure and temporal dynamic of tropical turf forming macroalgal assemblages of the western coast of Mexico

Macroalgal Distribution Patterns and Ecological Performances in a Tidal Coastal Lagoon, with Emphasis on the Non-indigenous Codium Fragile ssp. Tomentosoides

Distribution, biomass and production of Gracilaria in Lüderitz Bay, Namibia

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