Gracilaria verrucosa in Golfo Nuevo, Chubut, Argentina. Biological parameters and environmental factors

Zaixso, Alicia L. Boraso de

doi:10.1007/bf00046136

Cited by 9 publications

(3 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In order of importance according to their biomass and extension, these beds are Bahía Bustamante, Bahía Melo, and Bahía Arredondo. During the 1980s and 1990s, various studies of G. gracilis biology, population dynamics, and ecology were carried out (Mayer 1981;Boraso de Zaixso 1983, 1984, 1987, 1989, 1995aBoraso de Zaixso and Paternoster 1985;Boraso de Zaixso et al 1997;Romanello et al 1993). Like other Gracilaria species (Guillemin et al 2008a), G. gracilis reproduces sexually through haploid and diploid spores, which produce both haploid and diploid individuals consisting of erect thalli that grow from a perennial holdfast attached to the substratum.…”

Section: Introductionmentioning

confidence: 99%

Biomass variation and reproductive phenology of Gracilaria gracilis in a Patagonian natural bed (Chubut, Argentina)

2010

View full text Add to dashboard Cite

The biomass variation and the reproduction of the natural Gracilaria gracilis bed in Bahía Bustamante (Patagonia, Argentina) were analyzed for 2 years, with the aim of determining the present situation of the population for an updated status overview; establishing the relevant features of the temporal variation in both biomass and reproductive states in relation to environmental factors, epiphytes and associated algae; and assessing carpospore availability for future spore-culture development. Field measurements and sampling were performed monthly between March 2006 and February 2008. In both years, G. gracilis biomass presented marked seasonal variations, with a minimum in winter and a maximum in late spring and in summer. During both years, coexistence of the three life-cycle phases was found, with dominance of tetrasporophytes. Two data sets from individuals originated from sexual reproduction (tetraspores and carpospores) and from asexual reproduction by thallus fragmentation were analyzed separately. In the fragmentation fraction, tetrasporophyte frequencies remained higher than those for gametophytes. However, in the spore-originated fraction, a generation ratio close to 0.5 was observed. Female gametophytes bearing cystocarps were always present, with a maximum in summer and autumn. Biological data were related to environmental factors by means of canonical correspondence analysis (CCA). The first year was characterized by higher biomass values of G. gracilis and Undaria pinnatifida, lower epiphytism, larger Gracilaria thalli and greater proportion of mature tetrasporophytes and gametophytes. The second year was characterized by a high proportion of Gracilaria vegetative thalli and high epiphyte density. The best time to obtain spores from cystocarpic thalli would be in summer and early autumn.

show abstract

Section: Introductionmentioning

confidence: 99%

Biomass variation and reproductive phenology of Gracilaria gracilis in a Patagonian natural bed (Chubut, Argentina)

2010

View full text Add to dashboard Cite

show abstract

“…In Patagonian waters, macroalgae constitute a considerable economic resource, especially for harvesting of commercial species of Rhodophyta [23]. A number of descriptive studies on the taxonomy and distribution of Rhodophyta species have been carried out in this region [23][24][25][26], but very few have addressed the impact of solar radiation upon this group [27][28][29][30][31]. Protective mechanisms in Rhodophyta from Patagonia have been addressed only in some studies carried out by H€ ader et al [28] and by Korbee Peinado et al [31].…”

Section: Introductionmentioning

confidence: 99%

Dynamics of potentially protective compounds in Rhodophyta species from Patagonia (Argentina) exposed to solar radiation

Helbling

Barbieri

Sinha

et al. 2004

Journal of Photochemistry and Photobiology B: Biology

View full text Add to dashboard Cite

“…Year Yield (metric tons dry mass) Fig. 2 Commercial yields of Gracilaria from Saldanha Bay, 1951(data from 1951-1987after Anderson et al 1989data 1988 …”

Section: Resultsmentioning

confidence: 99%

The gracilarioids in South Africa: long-term monitoring of a declining resource

Rothman¹,

Anderson

Boothroyd³

et al. 2008

J Appl Phycol

View full text Add to dashboard Cite

In South Africa, gracilarioid red algae have been collected as wash-up to be dried and sold for agar extraction for at least 50 years. Despite much research, there is currently no commercial mariculture of the algae locally although this has been carried out in neighboring Namibia for a number of years. The industry is traditionally confined to Saldanha Bay on the west coast, although small wash-ups of Gracilariopsis longissima have been collected in nearby St Helena Bay. In Saldanha Bay, wash-ups of Gracilaria. gracilis have been very sporadic over the last few decades, with human alteration of the bay configuration possibly responsible for an initial major decline in 1974. This unpredictability in the amounts of wash-up has made the industry unstable and increasingly unprofitable. We compiled the results of previous surveys (some unpublished) of gracilariod populations in St Helena Bay and the Saldanha-Langebaan sytem, and re-surveyed these populations to examine long-term fluctuations. In Saldanha Bay and Langebaan Lagoon, standing stock of G. gracilis was estimated at 538 tons fresh weight and 71 tons fresh weight respectively. Less than 4 tons of gracilarioids are estimated to remain in St Helena Bay. We discuss the fluctuations in biomass and distribution of these South African gracilarioid populations.

show abstract

Gracilaria verrucosa in Golfo Nuevo, Chubut, Argentina. Biological parameters and environmental factors

Cited by 9 publications

References 9 publications

Biomass variation and reproductive phenology of Gracilaria gracilis in a Patagonian natural bed (Chubut, Argentina)

Biomass variation and reproductive phenology of Gracilaria gracilis in a Patagonian natural bed (Chubut, Argentina)

Dynamics of potentially protective compounds in Rhodophyta species from Patagonia (Argentina) exposed to solar radiation

The gracilarioids in South Africa: long-term monitoring of a declining resource

Contact Info

Product

Resources

About