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The ecology of some free-living Ectocarpaceae
Russell, G. (1967). The ecology of some free-living Ectocarpaceae. Helgol. Wiss. Meeresunters. 15(1-4): 155-162. https://dx.doi.org/10.1007/BF01618619
In: Helgoländer Wissenschaftliche Meeresuntersuchungen. Biologische Anstalt Helgoland: Hamburg. ISSN 0017-9957
Also appears in:
Kinne, O.; Aurich, H. (Ed.) (1967). Vorträge und Diskussionen. Erstes Europäisches Symposion über Meeresbiologie = Papers and discussions. First European Symposium on Marine Biology = Rapports et discussions. Premier symposium européen sur biologie marine. European Marine Biology Symposia, 1. Helgoländer Wissenschaftliche Meeresuntersuchungen, 15(1-4). 669 pp., more
Peer reviewed article  

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Keyword
    Marine/Coastal

Author  Top 
  • Russell, G.

Abstract
    1. The work concerning the ecology of free-living marine algae is reviewed briefly.2. The species examined in this investigation are the PhaeophyceaeEctocarpus fasciculatus, E. siliculosus andPilayella littoralis.3. From culture experiments using excised filament fragments as inoculum it is shown that these species can regenerate new tissue from detached pieces.4. The longevity of the free-living plants in nature is assessed using the apparatus illustrated in Figures 1 and 2 and found to be in the region of two months.5. Free-living plants may propagate vegetatively by fragmentation but they also continue to produce unilocular and plurilocular sporangia while in this condition. The fertility of the free-living plants is usually lower than in attached plants.6. The main morphological effects of the free-living state are increase in angle of branch emergence, reduction in length of lateral branches and loss of branch pattern. This is accompanied by reduction in size of reproductive bodies. It is shown thatE. distortus andE. landsburgii constitute free-living ecads ofE. fasciculatus.7. The role of free-livingEctocarpus andPilayella in the entire species populations is thought to be minor but it is suggested that they might form a sublittoral reservoir of material in summer when intertidal conditions may be exacting.

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