Marine Biology

, Volume 121, Issue 1, pp 167–173 | Cite as

Effect of bryozoan colonization on inorganic nitrogen acquisition by the kelps Agarum fimbriatum and Macrocystis integrifolia

  • C. L. Hurd
  • K. M. Durante
  • F. -S. Chia
  • P. J. Harrison


The effect of bryozoan colonization on inorganic nitrogen acquisition by Agarum fimbriatum Harv. and Macrocystis integrifolia Bory., collected from the west coast of Vancouver Island, British Columbia, Canada, was examined in laboratory experiments during June and July 1992. Pieces of kelp blades that were completely covered on one side by the bryozoans Lichenopora novae-zelandiae Busk or Membranipora membranacea, L., or uncolonized (clean treatment), were used to estimate the rate at which nitrate and ammonium were removed from the surrounding seawater. In addition, the rate of ammonium excretion by bryozoans isolated from their associated kelp was measured and also estimated from the results of the uptake experiments. Values obtained were used to estimate the contribution of ammonium excreted by bryozoans to the total amount of inorganic nitrogen available to the associated kelp. Both bryozoan species reduced the ability of the associated kelp to remove nitrate and ammonium from seawater but provided a source of ammonium to the kelp through excretion. The nitrogen status of colonized and clean kelp disks was determined from the ratio of total particulate carbon to total particulate nitrogen (C:N ratio). The C:N ratios for A. fimbriatum colonized with either L. novae-zelandiae or M. membranacea were similar (C:N=12 to 14), and differences between colonized and clean treatments were not significant. For A. fimbriatum, therefore, the C:N ratio indicates that this species was not nitrogen limited at the time of the present study. In contrast, both colonized and clean disks of M. integrifolia were nitrogen limited, but colonized disks (C:N=19) were significantly less limited by nitrogen than clean disks (C:N=29). Results are discussed in relation to the different environments inhabited by both kelp species and are consistent with the hypothesis that ammonium excreted by bryozoans was an important source of inorganic nitrogen to M. integrifolia, but not to A. fimbriatum, at the time of the study.


Nitrogen Ammonium Nitrate Laboratory Experiment West Coast 
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  1. Bernstein BB, Jung N (1980) Selective pressures and coevolution in a kelp canopy community in southern California. Ecol Monogr 49:335–355Google Scholar
  2. Blazka P, Brandl Z, Prochazkova L (1982) Oxygen consumption and ammonia and phosphate release in pond zooplankton. Limnol Oceanogr 27:294–303Google Scholar
  3. Cancino JM, Muñoz J, Muñoz M, Orellana MC (1987) Effects of the bryozoan Membranipora tuberculata (Bosc.) on the photosynthesis and growth of Gelidium rex Santelices et Abbott. J exp mar Biol Ecol 113:105–112Google Scholar
  4. DeBurgh ME, Fankboner PV (1978) A nutritional association between the bull kelp Nereocystis luetkeana and its epizooic bryozoan Membranipora membranacea. Oikos 31:69–72Google Scholar
  5. Dixon J, Schroeter SC, Kastendiek J (1981) Effects of the encrusting bryozoan, Membranipora membranacea, on the loss of blades and fronds by the giant kelp, Macrocystis pyrifera (LAMINAR-IALES). J Phycol 17:341–345Google Scholar
  6. Durante KM, Chia F-S (1991) Epiphytism on Agarum fimbriatum: can herbivore preferences explain distributions of epiphytic bryozoans? Mar Ecol Prog Ser 77:279–287Google Scholar
  7. Gardner WS, Scavia D (1981) Kinetic examination of nitrogen release by zooplankters. Limnol Oceanogr 26:801–810Google Scholar
  8. Hanisak DM (1983) The nitrogen relationships of marine macroalgae. In: Carpenter EJ, Capone DG (eds) Nitrogen in the marine environement. Academic Press, NY, pp 699–730Google Scholar
  9. Hurd CL, Dring MJ (1990) Phosphate uptake by intertidal algae in relation to zonation and season. Mar Biol 107:281–289Google Scholar
  10. Lobban CS (1978a) Translocation of 14C in Macrocystis integrifolia (Phaeophyceae). J Phycol 14:178–182Google Scholar
  11. Lobban CS (1978b) The growth and death of the Macrocystis sporophyte (Phaeophyceae, Laminariales). Phycologia 17:196–212Google Scholar
  12. Muñoz J, Cancino JM, Molina MX (1991) Effect of encrusting bryozoans on the physiology of their algal substratum. J mar biol Ass UK 71:877–882Google Scholar
  13. Oswald RC, Telford N, Seed R, Happey-Wood CM (1984) The effect of encrusting bryozoans on the photosynthetic activity of Fucus serratus L. Estuar cstl Shelf Sci 19:697–702Google Scholar
  14. Roland W (1980) Epiphytism and endophytism of Macrocystis integrifolia and Nereocystis luetkeana: seasonality, succession and tactics on temporary, living substrate. MSc Thesis, Simon Fraser University British Columbia, CanadaGoogle Scholar
  15. Seed R (1986) Ecological pattern in the epifaunal communities of coastal macroalgae. In: Moore PG, Seed R (eds) The ecology of rocky coasts. Columbia University Press, New York, pp 22–35Google Scholar
  16. Smith RG, Wheeler WN, Srivastava LM (1983) Seasonal photosynthetic performance of Macrocystis integrifolia (Phaeophyceae). J Phycol 19:352–359Google Scholar
  17. Vadas RL (1968) The ecology of Agarum and the kelp bed community. PhD Thesis, University of Washington, Seattle, Washington, USAGoogle Scholar
  18. Wheeler WN, Druehl LD (1986) Seasonal growth and productivity of Macrocystis integrifolia in British Columbia, Canada. Mar Biol 90:181–186Google Scholar
  19. Wheeler WN, Srivastava LM (1984) Seasonal nitrate physiology of Macrocystis integrifolia. J exp mar Biol Ecol 76:35–50Google Scholar
  20. Wing BL, Clendenning KA (1971) Kelp surfaces and associated invertebrates. In: North WJ (ed) The biology of giant kelp beds (Macrocystis) in California. Nova Hedwigia 32:319–341Google Scholar
  21. Woollacott RM, North WJ (1971) Bryozoans of California and northern Mexico kelp beds. In: North WJ (ed) The biology of giant kelp beds (Macrocystis) in California. Nova Hedwigia 32:455–479Google Scholar

Copyright information

© Springer-Verlag 1994

Authors and Affiliations

  • C. L. Hurd
    • 1
    • 2
  • K. M. Durante
    • 2
    • 3
  • F. -S. Chia
    • 3
  • P. J. Harrison
    • 1
  1. 1.Department of OceanographyUniversity of British ColumbiaVancouverCanada
  2. 2.Eamfield Marine StationBamfieldCanada
  3. 3.Department of ZoologyUniversity of ZlbertaEdmontonCanada

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