The Ecology of Lough Ine: XX. The Laminaria Forest at Carrigathorna

Norton, Trevor A.; Hiscock, Keith; Kitching, J. A.

doi:10.2307/2259386

Cited by 57 publications

(49 citation statements)

References 23 publications

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“…Kübler & Raven (1994) showed that reduced light conditions resulted in isotopically lighter plants in 3 different species of red algae. The young kelp plants grow in the understorey, where as much as 90% of the light may be absorbed by the canopy layer (Norton et al 1977), so young plants are restricted to light-limited conditions and as a consequence, slow growth. No seasonal variation in δ 13 C and δ 15 N could be found in these plants.…”

Section: Seasonal and Intra-laminar Variation In Isotopic Signalsmentioning

confidence: 99%

Food web studies in a Norwegian kelp forest based on stable isotope (δ13C and δ15N) analysis

Fredriksen¹

2003

Mar. Ecol. Prog. Ser.

238

167

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Section: Seasonal and Intra-laminar Variation In Isotopic Signalsmentioning

confidence: 99%

Food web studies in a Norwegian kelp forest based on stable isotope (δ13C and δ15N) analysis

Fredriksen¹

2003

Mar. Ecol. Prog. Ser.

238

167

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“…On most parts of the rocky coasts of Britain, the subtidal laminarian algae form zones. The upper margin of the subtidal region is dominated by Laminaria digitata and/or Alaria esculenta; at their lower limit, below lowest astronomical tide, these are displaced by Laminaria hyperborea and/or Laminaria saccharina (Kitching, 1941;Kain, 1962;Norton et al, 1977). The present study was designed to investigate the effect of photon irradiance and photoperiod on the growth of young sporophytes of these four species of the Laminariales and thereby to predict their growth behaviour in the sea.…”

Section: Introductionmentioning

confidence: 99%

Effect of photon irradiance and photoperiod on young sporophytes of four species of the Laminariales

Han

Kain

1996

European Journal of Phycology

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Four kelp species (Alaria esculenta, Laminaria digitata, L. hyperborea and L. saccharina) were cultured in the laboratory and pretreated so that gametophytes became mature and sporophytes were produced. Young sporophytes less than 3 weeks old were exposed to various light conditions and their survival or relative growth rate in length (RL), and width (Rw) in one experiment, determined. Sporophytes of L. digitata survived poorly in the dark compared with L hyperborea. The minimum photon irradiance allowing growth in L. hyperborea was about 1 #moI m -2 s-I; I-2 #mol m 2 s-Z sustained growth in all the species. The growth of all four species was saturated at 20-30/*mol m z s i of continuous photon irradiance. In shorter daylengths the growth rate was lower both below and above light saturation. Above saturation the growth was considerably faster than would be expected if no photosynthetic products were carried over from the light to the dark period. There was evidence that 2-3 times as much light was necessary to saturate photosynthesis as to saturate growth. Although there were significant differences between the species in R L during the first 10 days, differences in R w and in sporophyte age made it impossible to distinguish fast-or slow-growing species during the first 3 weeks. Single-dimension growth measurements at this developmental stage can thus be misleading. Young sporophytes of L. digitata were more tolerant of strong sunlight than those of L. hyperborea, but in both the survival was higher following acclimation to higher irradiance.

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“…The canopy-forming plants can reduce the light penetration to the bottom by as much as 90% (Norton et al 1977), and the growth of understorey plants of L. hyperborea is therefore probably severely light-limited in dense stands. Growth of young kelp plants in a dense kelp forest constitutes an analogous example to seedlings in a forest on land.…”

Section: Introductionmentioning

confidence: 99%

Growth allocation in Laminaria hyperborea (Laminariales, Phaeophyceae) in relation to age and wave exposure

Sjøtun

Fredriksen²

1995

Mar. Ecol. Prog. Ser.

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Morphological development of Laminaria hyperborea was examined at localities with different degrees of wave exposure. Biomass data were converted to estimates of annual growth of lamina, stipe and hapteron. Allocation of annual growth to the hapteron constituted a small amount of the total production, but increased with increasing wave exposure. At the most sheltered locality, lamina growth amounted to between 80 and 95% of total growth in all age groups, and lamina to stipe ratios (fresh weight) were about 10. A higher portion of the annual growth was allocated to the stipe at the more wave-exposed localities. This resulted in lamina to stipe ratios of between 1 and 2 in old plants, but within these localities no gradual decrease in lamina to stipe ratio with increasing wave exposure was observed. At some localities a maximum of growth allocation to the stipe was found in the intermediate age groups. This was most pronounced at the locality with the highest density of canopy plants and intermediate wave exposure. Also, at this locallty the stipes were longer in relation to their weight than at the other localities. These results indicate that light environment, in additlon to wave exposure, Inay influence the stipe morphology and the relationship between stipe and lamina growth. At one station stipe growth was also calculated in individual tagged plants using the lengthweight relationship. The results agreed with those obtained by the biomass method. The highest allocation of growth to the stipes was found in 3 and 4 yr old plants. Maximum annual stipe growth (weight increase) occurred in 4 and 5 yr old plants and decreased in older plants, while maximum lamina growth was found in the oldest plants.

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The Ecology of Lough Ine: XX. The Laminaria Forest at Carrigathorna

Cited by 57 publications

References 23 publications

Food web studies in a Norwegian kelp forest based on stable isotope (δ13C and δ15N) analysis

Food web studies in a Norwegian kelp forest based on stable isotope (δ13C and δ15N) analysis

Effect of photon irradiance and photoperiod on young sporophytes of four species of the Laminariales

Growth allocation in Laminaria hyperborea (Laminariales, Phaeophyceae) in relation to age and wave exposure

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