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Effects of secondarily treated sewage effluent on intertidal macroalgal recruitment processes

Bellgrove, Alecia, Clayton, MN and Quinn, GP 1997, Effects of secondarily treated sewage effluent on intertidal macroalgal recruitment processes, Marine and Freshwater Research, vol. 48, no. 2, pp. 137-146.


Title Effects of secondarily treated sewage effluent on intertidal macroalgal recruitment processes
Author(s) Bellgrove, AleciaORCID iD for Bellgrove, Alecia orcid.org/0000-0002-0499-3439
Clayton, MN
Quinn, GP
Journal name Marine and Freshwater Research
Volume number 48
Issue number 2
Start page 137
End page 146
Total pages 10
Publication date 1997-01-01
ISSN 1323-1650
Summary Effluent is discharged below the low-water mark at Boags Rocks, Victoria, Australia, at an average rate of 437 x 106 L day-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 Enteromorpha showed very high recruitment and propagule densities in the water column at polluted sites, apparently benefiting from the increased nutrient loads. Investigation of the number of H. 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.
Field of Research MD Multidisciplinary
Persistent URL http://hdl.handle.net/10536/DRO/DU:30094036

Document type: Journal Article
Collections: Provisional Records Queue
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