Sporangial Sori on Stipes of Lessonia nigrescens Bory (Laminariales, Phaeophyta): A High Frequency Phenomenon in Intertidal Populations of Northern Chile

Venegas, Mariela; Tala, Fadia; Fonck, Erika; Vásquez, Julio A.

doi:10.1515/botm.1992.35.6.573

Cited by 9 publications

(7 citation statements)

References 9 publications

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“…Location of growth meristems and reproductive structures in different kelp species (Edding et al 1994;Hoffmann and Santelices 1997) determines that the way of harvesting has different consequences for different species: Lessonia has sori on apical fronds and along stipes (Edding et al 1994;Venegas et al 1992), whereas sporophylls are basally distributed in Macrocystis. The meristems of both genera are apically distrubuted, and only Macrocystis continually produces new stipes from the holdfast.…”

Section: Discusion and Conclusionmentioning

confidence: 99%

Production, use and fate of Chilean brown seaweeds: re-sources for a sustainable fishery

Vásquez

2008

J Appl Phycol

105

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Chile is an important producer of brown seaweeds representing 10% of world supply. Landings of Chilean kelp fluctuated between 40,000 t.year −1 in the early '80s to 250,000 t.year −1 more recently. Commercialized algae come from natural populations and no mass-cultures of involved species have been established. Four species of brown algae are commercially collected in the country: Lessonia trabeculata, L. nigrescens, Macrocystis pyrifera and M. integrifolia. Since 2000, the demand of alginate sources and food for cultivated abalones dramatically raised the harvesting of these species. Direct evaluations of Lessonia spp. and Macrocystis standing-stocks were made along 700 km of coast in northern Chile. Lessonia spp. estimated populations exceed 900,000 t, whereas M. integrifolia does not exceed 300 t. The insights provided indicate that sustainability of Chilean kelp subjected to intense harvesting would require management programs including the following bio-ecological recommendations:(1) to harvest the entire plant including the holdfast; (2) to harvest plants larger than 20 cm in diameter; (3) to harvest plants sparsely, selecting mayor specimens; (4) rotation of harvesting areas; and (5) for Macrocystis, to cut the canopy 1-2 m from the surface. They must be implemented in a National Program of Kelp Management, elaborated by government, scientists, fisherman, and industry.

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Section: Discusion and Conclusionmentioning

confidence: 99%

Production, use and fate of Chilean brown seaweeds: re-sources for a sustainable fishery

Vásquez

2008

J Appl Phycol

105

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“…Sori have also been observed on the midrib of U. pinnatifida (Sanbosunga and Hasegawa ), and on stipes of a Lessoniaceae Lessonia nigrescens (Venegas et al. ). In M. pyrifera (Linnaeus) C.Agardh, the only sporophyll‐bearing species in the family Laminariaceae, different vegetative laminae (i.e., frond initials, surface‐canopy blades and apical scimitars) have been reported to bear sori (Brandt , Neushul , Lobban , Graham et al.…”

mentioning

confidence: 95%

“…In the field, natural populations of Undaria pinnatifida and Alaria crassifolia produced sori on their blades, usually toward the end of their reproductive period (Stuart et al 1999, Kumura et al 2006). Sori have also been observed on the midrib of U. pinnatifida (Sanbosunga and Hasegawa 1967), and on stipes of a Lessoniaceae Lessonia nigrescens (Venegas et al 1992). In M. pyrifera (Linnaeus) C.Agardh, the only sporophyll-bearing species in the family Laminariaceae, different vegetative laminae (i.e., frond initials, surface-canopy blades and apical scimitars) have been reported to bear sori (Brandt 1923, Neushul 1963, Lobban 1978, Graham et al 2007).…”

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confidence: 99%

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Meiospores produced in sori of nonsporophyllous laminae of Macrocystis pyrifera (Laminariales, Phaeophyceae) may enhance reproductive output

Leal

Hurd

Roleda

2014

Journal of Phycology

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Different lamina of Macrocystis pyrifera sporophytes (i.e., sporophylls, pneumatocyst-bearing blades, and apical scimitars) in a wave-sheltered site were found to be fertile. We quantified their sorus surface area, reproductive output (number of spores released) and the viability of released spores (germination rate). Sorus area was greatest on the sporophylls, with sporangia developing on >57% of the total area and smallest on the pneumatocyst-bearing blades with 21% of the total area bearing sporangia. The apical scimitar released the greatest number of meiospores (cells · mL(-1) · cm(-2) ) and the sporophylls the least. Meiospores produced from all types of fertile laminae were equally viable. This reproductive plasticity may enhance reproductive output, and contribute to short and long-distance spore dispersal and the cryptic gametophyte propagule bank for the next generation of sporophytes.

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“…Santelices et al . 1980; Santelices & Ojeda 1984; Venegas et al . 1992; Camus 1994; Vásquez & Tala 1995; Westermeier & Gómez 1996; Martínez & Santelices 1998; Martínez et al .…”

Section: Introductionmentioning

confidence: 99%

First estimates of productivity in Lessonia trabeculata and Lessonia nigrescens (Phaeophyceae, Laminariales) from the southeast Pacific

Tala¹,

Edding

2007

Phycological Research

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Lessonia is the main Laminariales found along the southeast Pacific coast. Lessonia nigrescens Bory de Saint-Vincent in the intertidal and Lessonia trabeculata Villouta et Santelices in the subtidal, are the most important habitat constructors in rocky coastal communities in northern and central Chile. In both species, the seasonal production and erosion of distal tissue were estimated in biomass units using the Area of Constant Biomass Model that combined the individual blade elongation, obtained with the traditional holepunching method, with the blade length and biomass distribution along the blade. In austral late spring (December 96) and autumn (May 97), blade production and erosion were transformed to the level of population from standing stock measurements (number and biomass of blades and plants per substrate area), considering that previous blade weight analysis showed the highest and lowest values at these times, as well as the population parameter extremes that were expected to occur. Both species displayed a seasonal pattern, with a production increase in later winter and spring and decrease towards the end of summer that coincided with higher distal tissue erosion. At the level of individual blades, Lessonia trabeculata showed higher mean production (0.026 g dw d −1 ) and erosion (0.01 g dw d −1 ) than L. nigrescens (production 0.01 g dw d −1 and loss 0.002 g dw d −1 ). The standing stocks, with respect to density and biomass, were similar in spring and autumn for both populations. Nevertheless, the net productivity (production minus erosion) of the intertidal L. nigrescens showed greater values due to the greater density of blades (2112 ± 1360 (SE) blades m −2 ) compared with the subtidal L. trabeculata (527 ± 151 (SE) blades m −2 ). Spring net productivities of 42 g dw m −2 d −1 (254 g ww m −2 d −1 ; 11.46 gC m −2 d −1 ) for L. nigrescens and 11 g dw m −2 d −1 (64 g ww m −2 d −1 ; 2.46 gC m −2 d −1 ) for L. trabeculata were estimated. A preliminary model of production and biomass fate for Lessonia populations is proposed.

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Sporangial Sori on Stipes of Lessonia nigrescens Bory (Laminariales, Phaeophyta): A High Frequency Phenomenon in Intertidal Populations of Northern Chile

Cited by 9 publications

References 9 publications

Production, use and fate of Chilean brown seaweeds: re-sources for a sustainable fishery

Production, use and fate of Chilean brown seaweeds: re-sources for a sustainable fishery

Meiospores produced in sori of nonsporophyllous laminae of Macrocystis pyrifera (Laminariales, Phaeophyceae) may enhance reproductive output

First estimates of productivity in Lessonia trabeculata and Lessonia nigrescens (Phaeophyceae, Laminariales) from the southeast Pacific

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