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Short-term dispersal of kelp fauna to cleared (kelp-harvested) areas
Waage-Nielsen, E.; Christie, H.C.; Rindle, E. (2003). Short-term dispersal of kelp fauna to cleared (kelp-harvested) areas, in: Jones, M.B. et al. (Ed.) Migrations and Dispersal of Marine Organisms: Proceedings of the 37th European Marine Biology Symposium held in Reykjavik, Iceland, 5-9 August 2002. Developments in Hydrobiology, 174: pp. 77-91
In: Jones, M.B. et al. (Ed.) (2003). Migrations and Dispersal of Marine Organisms: Proceedings of the 37th European Marine Biology Symposium held in Reykjavik, Iceland, 5-9 August 2002. Reprinted from Hydrobiologia, 503. Developments in Hydrobiology, 174. Kluwer Academic: Dordrecht. ISBN 1-4020-1736-7. XII, 262 pp., more
In: Dumont, H.J. (Ed.) Developments in Hydrobiology. Kluwer Academic/Springer: The Hague; London; Boston; Dordrecht. ISSN 0167-8418, more

Also published as
  • Waage-Nielsen, E.; Christie, H.C.; Rindle, E. (2003). Short-term dispersal of kelp fauna to cleared (kelp-harvested) areas. Hydrobiologia 503: 77-91, more

Available in  Authors 
    VLIZ: Proceedings [56435]
Document type: Conference paper

Keywords
    Artificial substrata; Dispersion; Kelps; Marine invertebrates; Recovery; Laminaria hyperborea (Gunnerus) Foslie, 1884 [WoRMS]; Marine

Authors  Top 
  • Waage-Nielsen, E.
  • Christie, H.C.
  • Rindle, E.

Abstract
    The kelp Laminaria hyperborea forms large forests and houses a numerous and diverse fauna, especially in the kelp holdfast and stipe epiphytes. Kelp harvesting creates cleared areas and fragmentizes the kelp forest. We investigated the dispersal ability of kelp fauna to cleared, harvested areas by studying their colonization pattern to artificial substrata (kelp mimics) exposed for a short (3 days) and longer time period (35 days) at different sites within the kelp forest (one site) and at a cleared area (two sites). Most of the kelp fauna (111 species) showed a rapid dispersal and colonized the artificial substrata within the cleared area. The similarity of the faunal community in the mimics with the natural kelp holdfast community increased with the length of the exposure period. During the experiments, 87% of the mobile species in the kelp plants were found in the kelp mimics, indicating good dispersal for slow-moving animals like gastropods, polychaetes and tube-building crustaceans. Relating the frequency of the different faunal groups in the untrawled kelp forest to their frequency in the kelp mimics, showed gastropods, amphipods and decapods to have relatively high dispersal rates, whereas isopods, bivalves, polychaetes and tanaids showed a lower dispersal rate than expected. Amphipods dispersed as juveniles and adults. No significant differences were found between the faunal composition and number of species in the mimics placed inside the kelp forest and in the cleared area. Remaining holdfasts and pebbles were identified as refuges/alternative habitats in the harvested area, and may together with the nearest kelp vegetation, serve as sources for colonization to new substrata. The high dispersal ability of most of the kelp fauna provides maintenance of the faunal composition of disturbed habitats and ensures colonization of recovering algal habitats regardless of reproduction strategy.

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