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Effects of secondarily treated sewage effluent on intertidal macroalgal recruitment processes
Bellgrove, A.; Clayton, M.N.; Quinn, G.P. (1997). Effects of secondarily treated sewage effluent on intertidal macroalgal recruitment processes. Mar. Freshw. Res. 48(2): 137-146
In: Marine and Freshwater Research. CSIRO: East Melbourne. ISSN 1323-1650, more
Peer reviewed article  

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Keyword
    Marine

Authors  Top 
  • Bellgrove, A.
  • Clayton, M.N.
  • Quinn, G.P.

Abstract
    Effluent is discharged below the low-water mark at Boags Rocks, Victoria, Australia, at an average rate of 437 x 10 super(6) L day super(-1). Three study sites following a gradient of pollution from high (at Boags Rocks) to intermediate (Cape Schanck) to unpolluted (Cheviot Beach) were chosen for the main experiments. Surveys of the algal assemblages were conducted in spring and summer and showed the absence of the pre-discharge dominant Hormosira banksii at Boags Rocks and an abundance of turf-forming and ephemeral species at the two polluted sites. There was no evidence that the treated sewage detrimentally affected either the availability of propagules (asexual spores, gametes, zygotes or fragments) or macroalgal recruitment to artificial or natural substrata. Opportunistic genera such as Ulva and EnteromorphaH. banksii zygotes in water samples from various habitats showed very limited dispersibility for this species. The small dispersal shadow of H. banksii, combined with the environmental pressures placed on establishing zygotes, would severely limit the re-establishment of this species at polluted sites, even if given suitable conditions.

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