Productivity and life history of Laminaria longicruris at its southern limit in the Western Atlantic Ocean

Egan, B.; Yarish, Charles

doi:10.3354/meps067263

Cited by 34 publications

(20 citation statements)

References 26 publications

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“…The limited data from Payne Bay tagging experiments indicate S. longicruris in Ungava Bay grows at yearly rates similar to rates recorded for this species or conspecifics in temperate waters 1.0-2.0 cm day −1 (Chapman and Craigie 1978;Egan and Yarish 1990;Parke 1948). In the high arctic, L. saccharina (S. latissima) retains old leaf blades, thus the specific growth rate in terms of growth per unit length of blade is lower than in southern populations (Borum et al 2002).…”

Section: Discussionmentioning

confidence: 91%

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The potential for seaweed resource development in subarctic Canada; Nunavik, Ungava Bay

et al. 2008

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Ungava Bay is ice covered 6-7 months of the year and evidence of ice scouring of seaweeds is extensive in the intertidal and shallow subtidal. Maximum tidal amplitudes of 16 m, among the highest in Canadian waters, compound this impact. Despite this level of annual perturbation, very extensive and dense beds of fucoids in the intertidal and laminarians in the subtidal are common on the western shores of Ungava Bay. Ground surveys of 24 intertidal stations combined with satellite images delineated 82,000 tons standing crop of Fucus vesiculosus and Fucus evanescens in Payne Bay, of which 36,000 tons were considered harvestable. Subtidally, kelp cover reached peak biomass at 5-10 m consisting of three primary species, Saccharina longicruris, Laminaria digitata, and Laminaria solidungula. In the area of Payne Bay, kelp beds of 100 ha were common, averaging 9-12 kg m −2 wet weight. The productivity of brown algae at these latitudes has been assumed to be low relative to southern latitudes. Direct measurement of lineal growth indicates productivity is intermediate between arctic and temperate populations. The potential for medium level industrial harvest exists under conservative management strategies within the constraints of subarctic logistics.

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Section: Discussionmentioning

confidence: 91%

“…At the southern limit of S. longicruris in Long Island Sound, USA, a maximum biomass was 24 kg m −2 compared to 18 kg m −2 in Payne Bay (Egan and Yarish 1990). Laminaria saccharina (=Saccharina latissima) populations in a high arctic Greenland fjord averaged 49 g m −2 (Borum et al 2002).…”

Section: Discussionmentioning

confidence: 97%

The potential for seaweed resource development in subarctic Canada; Nunavik, Ungava Bay

et al. 2008

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“…In the Simplices group of Laminaria, L· saccharina (L.) Lamour and L. longicruris tend towards long hollow stipes in sheltered conditions (Kain 1976, Gerard andMann -1979). However at the southern limit of L. longicruris, in moderate exposure at Long Island Sound, long hollow stiped populations occur (Egan and Yarish 1990). In contrast, hollow stiped L. schinzii dominates on the high energy coast of Namibia, while the hollow stiped Ecklonia maxima dominates on the high energy habitats of the south western Cape coast of South Africa (Jarman and Carter 1981) and Nereocystis luetkeana (Mertens) Postels et Ruprecht which is also hollow stiped, thrives in exposed waters on the west coast of North America (Koehl 1986).…”

Section: Resultsmentioning

confidence: 98%

The Effects of Wave Exposure and Depth on the Morphology of Inshore Populations of the Namibian Kelp, Laminaria schinzii Foslie

Molloy¹,

Bolton²

1996

Botanica Marina

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Populations of Laminaria schinzii from three depths on three Namibian shores exposed to different degrees of wave action were studied to determine morphological variation with depth and water motion. Analysis of variance indicated that all of the measured morphological characteristics varied significantly with depth and water motion (as measured by plaster clod erosion) but the degree of variation (f) for individual characteristics differed markedly. Depth had a greater effect on morphology as a whole but the strongest single interaction was between water motion and blade thickness. The plant characteristics measured were analysed using discriminant analysis and the depth/site groups were well separated on the two axes of the resulting ordination with 70% of the grouped cases correctly classified. The greatest separation was along function I, which correlated most strongly with blade thickness; function II correlated with stipe length, stipe length/stipe weight and frond surface area. No significant difference in attachment strength was found between plants growing in the extremes of water motion, a decrease in frond surface area in more exposed sites resulted in a decreased resistance to water motion.

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“…The Black Ledge site was chosen because it has one of the most extensive Laminaria populations in Long Island Sound (Egan & Yarish, 1990), with an area of 1 km 2 . It is located 1 km offshore, east of the mouth of the Thames River, at 4 m below MLW (Fig.…”

Section: Site Descriptionmentioning

confidence: 99%

“…Lining (1988) showed that production of sorus tissue for Laminaria saccharina (an ecotype of L. longicruris) in Helgoland is initiated by blue light in a short-day regime, but the influence of blue light and daylength on populations of L. longicruris in the western Atlantic Ocean has not been investigated. Photoperiod alone is not the sole environmental determinant of sporulation, since sorus forms at all months of the year (Egan & Yarish, 1990). The role of temperature in gametogenesis of L. longicruris has been investigated in culture and found to be of critical importance for gametophyte fertility and egg release (Egan et al, 1989) but has not to our knowledge been related to the timing of and al-location of blade surface to sorus formation in this species.…”

Section: Introductionmentioning

confidence: 99%

Allocation of blade surface to reproduction in Laminaria longicruris of Long Island Sound (USA)

Patten

Yarish

1993

Hydrobiologia

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Sorus formation in the kelp Laminaria longicruris de la Pylaie (Phaeophyta) was quantified for a biennial population in Long Island Sound (Connecticut, USA), at the southern limit of its biogeographical range in the Western Atlantic Ocean. The allocation of blade surface to reproduction was measured monthly during two years, with additional samples taken at times of peak growth and reproduction. Sporophytes produced sori year-round, with the highest percentages of fertile plants (75 to 95 percent) occurring from October to December. The mean percentage of sorus area to blade ranged from 1 to 37 percent, remaining low and fairly constant during the spring and summer, but reaching much higher levels in the fall (when growth is minimal) and early winter. The comparatively low mean annual allocation of blade surface to reproduction (5 percent), was postulated to be due to temperature stress on these plants at the southern limit of distribution, but may instead be typical of the species. Such a small allocation of resources to reproduction nevertheless results in billions of spores per m 2 of substrate, making a major contribution of material potentially available to grazing food webs.

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Productivity and life history of Laminaria longicruris at its southern limit in the Western Atlantic Ocean

Cited by 34 publications

References 26 publications

The potential for seaweed resource development in subarctic Canada; Nunavik, Ungava Bay

The potential for seaweed resource development in subarctic Canada; Nunavik, Ungava Bay

The Effects of Wave Exposure and Depth on the Morphology of Inshore Populations of the Namibian Kelp, Laminaria schinzii Foslie

Allocation of blade surface to reproduction in Laminaria longicruris of Long Island Sound (USA)

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