The fate of overgrown germlings in coalescing Rhodophyta

Santelices, B.; Hormazábal, M.; Correa, Juan A.; Flores, Verónica

doi:10.2216/i0031-8884-43-4-346.1

Cited by 19 publications

(13 citation statements)

References 12 publications

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“…This could be due to the fact that conditions for their development were not optimum, because of possible nutrient depletion in the small volume of medium in the Petri dish. This negative interaction among sporelings in high density areas has been observed in Gracilaria chilensis (Alveal et al 1997), as well as in other red algae (Santelices et al 2004).…”

Section: Discussionsupporting

confidence: 55%

Settlement of Gracilaria gracilis carpospores (Gracilariales, Rhodophyta) on natural substrates from the southwestern Atlantic coast (Chubut, Argentina)

Hughes¹,

Michetti²,

Leonardi³

2014

Botanica Marina

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Gracilaria gracilis is an important agarophyte that is exploited in Argentina by the harvest of detached thalli cast on the shore. Therefore, the study of carpospores is relevant because such spores can be used as inoculum for commercial aquaculture. In this study, the potential of two natural substrates from the Patagonian coast, for the settlement and growth of G. gracilis carpospores, was evaluated in the laboratory. Highly significant differences were found between substrates both in the proportion of substrates with settled spores and in carpospore density, shells being more suitable than pebbles. Regarding carposporeling growth, differences in sporeling length between substrates could not be detected by the end of the study, although basal discs reached a significantly higher diameter on pebbles than on shells. Results indicate that shells would be a good substrate to start spore culture because they offer a suitable surface for spore settlement. In addition, if the substrate is inoculated with sufficient seedling material to avoid competition among individuals and, if epiphytism is successfully reduced, sporelings should reach the required size for transport to the natural environment.Abbreviation SGR, Specific growth rate (% day -1 ).

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Section: Discussionsupporting

confidence: 55%

Settlement of Gracilaria gracilis carpospores (Gracilariales, Rhodophyta) on natural substrates from the southwestern Atlantic coast (Chubut, Argentina)

Hughes¹,

Michetti²,

Leonardi³

2014

Botanica Marina

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“…Whether or not coalesced discoid crusts produce erect juvenile germlings might depend on crust diameter just before coalescence (Santelices et al 2004). No obvious differences appeared in the development of erect juvenile germlings from single or coalesced discoid crusts.…”

Section: Discussionmentioning

confidence: 91%

Carpospore early development and callus-like tissue induction of Chrysymenia wrightii (Rhodymeniaceae, Rhodophyta) under laboratory conditions

Zhao

Wang

et al. 2009

J Appl Phycol

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Morphological and culture studies of germlings derived from carpospores of Chrysymenia wrightii (Harvey) Yamada were carried out under various treatments combining temperature and irradiance. Basal, main, and tip branches were applied for inducing callus-like tissue. Focus was on how carpospores develop into germlings, how callus-like tissues are induced from explants, and how temperature and irradiance affect carpospore germination and discoid crust growth. Results show that carpospore development can be divided into three stages: division stage, discoid crust stage, and erect juvenile germling stage. Discoid crusts, even more than ten, might coalesce into a big discoid crust, and then developed into germlings. Filamentous fronds, formed on the rims of discoid crusts, exhibited in self-existence or co-existence form with germlings, could form spherical tufts if cultured separately. Filamentous callus-like tissues appeared on the tip branches after 13 days. PES is suitable for filament induction and culture, and filaments have potential use in germplasm preservation and vegetative propagation. Temperature (10, 15, 20, 25°C) and irradiance (8 and 36 µmol photons m −2 s −1 ) significantly influenced carpospore germination rate and discoid crust diameter. Carpospores germinated normally under 36 µmol photons m −2 s −1 , 15~25°C, and maximum growth of discoid crusts was at 25°C, 36 µmol photons m −2 s −1 ; 10°C and 8 µmol photons m −2 s −1 did not favor carpospore germination or discoid crust growth.

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“…Field studies have already shown that coalescence and mortality may occur among field‐established clumps (Santelices et al. 2003a) and that coalescence may occur at all ontogenic stages (Santelices et al. 2004).…”

Section: Discussionmentioning

confidence: 99%

“…1996), basal crusts of field‐established clumps (Santelices et al. 2003a), or sporelings and grown crusts (Santelices et al. 2004).…”

mentioning

confidence: 99%

DEMOGRAPHIC CONSEQUENCES OF COALESCENCE IN SPORELING POPULATIONS OF MAZZAELLA LAMINARIOIDES (GIGARTINALES, RHODOPHYTA)¹

Santelices

Alvarado

2008

Journal of Phycology

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Coalescing macroalgae are ecologically important members of intertidal and shallow subtidal communities. However, we still lack quantitative information on the demographic consequences of coalescence. Using demographic models developed for modular invertebrates, we studied the demography of settlement and early recruitment in the coalescing macroalga Mazzaella laminarioides (Bory) Fredericq. Permanently marked microscopic fields on laboratory-incubated and field-incubated plates were monitored regularly (at 15, 30, 45, and 60 d) using image analysis techniques to evaluate the relative importance of settler abundance, mortality, coalescence (fusion), and fission on the changes in size and numbers of recruits. On the plates, spores settled individually or in groups. Over time, spores in close proximity may coalesce, resulting in a mixture of unisporic and multisporic crusts. When new spores arrive, they may or may not coalesce with previously settled crusts. Coalescence and mortality reduce the number of sporelings, but coalescence increases the size of the sporelings, thereby reducing further probability of sporeling mortality. Crust fissions are negligible in frequency, while the frequency of coalescence increases from ∼25% after only 3 d, to ∼75% after 60 d. Thus, as a result of variable settlement, mortality, and coalescence, any area colonized by M. laminarioides would contain a mixture of crusts of different sizes, ages, and genetic constitution. The interactions between the above three processes create a more complex survivorship curve than the ones known for unitary organisms.

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The fate of overgrown germlings in coalescing Rhodophyta

Cited by 19 publications

References 12 publications

Settlement of Gracilaria gracilis carpospores (Gracilariales, Rhodophyta) on natural substrates from the southwestern Atlantic coast (Chubut, Argentina)

Settlement of Gracilaria gracilis carpospores (Gracilariales, Rhodophyta) on natural substrates from the southwestern Atlantic coast (Chubut, Argentina)

Carpospore early development and callus-like tissue induction of Chrysymenia wrightii (Rhodymeniaceae, Rhodophyta) under laboratory conditions

DEMOGRAPHIC CONSEQUENCES OF COALESCENCE IN SPORELING POPULATIONS OF MAZZAELLA LAMINARIOIDES (GIGARTINALES, RHODOPHYTA)¹

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The fate of overgrown germlings in coalescing Rhodophyta

Cited by 19 publications

References 12 publications

Settlement of Gracilaria gracilis carpospores (Gracilariales, Rhodophyta) on natural substrates from the southwestern Atlantic coast (Chubut, Argentina)

Settlement of Gracilaria gracilis carpospores (Gracilariales, Rhodophyta) on natural substrates from the southwestern Atlantic coast (Chubut, Argentina)

Carpospore early development and callus-like tissue induction of Chrysymenia wrightii (Rhodymeniaceae, Rhodophyta) under laboratory conditions

DEMOGRAPHIC CONSEQUENCES OF COALESCENCE IN SPORELING POPULATIONS OF MAZZAELLA LAMINARIOIDES (GIGARTINALES, RHODOPHYTA)1

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DEMOGRAPHIC CONSEQUENCES OF COALESCENCE IN SPORELING POPULATIONS OF MAZZAELLA LAMINARIOIDES (GIGARTINALES, RHODOPHYTA)¹