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<DIV><B>Subject:</B> Re: not ragworms? Some can handle anoxic conditions...defies biochem maybe On Tue, Jan 6, 2015 at 9:52 PM, Dusan Soudek <soudekd@ns.sympatico.ca> wrote: > I can see that a well-deigned and properly maintained (i.e., mechanically > aerated) sewage lagoon or engineered marsh can support a highly diverse and > productive ecosystem. But not if the decomposing sewage makes the water > column anoxic. Nothing but anaerobic bacteria survive there... > Dusan Soudek > > > From: David & Alison Webster > Sent: Tuesday, January 06, 2015 8:19 PM > To: naturens@chebucto.ns.ca > Subject: Re: [NatureNS] Sewer Strolls: Before and After Harbour Cleanup ? > > Hello: > Would not many forms of zooplankton species > Feed directly on soup that is made out of feces ? > And thus form a meal for the next larger size > Until some can be seen using unaided eyes. > Yt, DW, Kentville > > ----- Original Message ----- > From: Dusan Soudek > To: naturens@chebucto.ns.ca > Sent: Tuesday, January 06, 2015 6:59 PM > Subject: RE: [NatureNS] Sewer Strolls: Before and After Harbour Cleanup ? > > These are interesting observations. I can see how fertilizing a harbour with > sewage will increase its primary production and shift if from attached > plants (kelp, eelgrass, etc.) to phytoplankton. But I doubt that the > unmentionables we flush down our toilets are directly available to seabirds > and seals as food. The stuff forms local sewage upwellings (sewage is warm), > is dispersed by tidal currents, and broken down by decomposers, which > eventually liberate the phosphates and nitrates... > Dusan Soudek > > On January 6, 2015 at 12:40 PM jen cooper <iffercooper@hotmail.com> wrote: > > Hello all, > > I can't speak to Halifax Harbour but for comparison... > The Sydney side of Sydney harbour was fitted with wastewater infrastructure > within the last ten years. Since the diversion of wastewater the clusters of > diving ducks and seals, have either left or are very obviously not as > plentiful as they used to be. On the west side of the harbour where > infrastructure is yet to come (but on the way!) ducks still frequent the > outfalls. > > My two cents on why, are these: > > Wastewater does cause eutrophication, fertilizing plants and algae (an > onwards up the web). Food availability would definatley be different at > outfalls than where there are none. > > Often times, here, the warmer water at outfalls causes openings in the ice. > In some areas these are the only access points to the water. > > :) Jen > > > ________________________________ > From: soudekd@ns.sympatico.ca > To: naturens@chebucto.ns.ca > Subject: Re: [NatureNS] Sewer Strolls: Before and After Harbour Cleanup ? > Date: Sun, 4 Jan 2015 18:21:18 -0400 > > Joanne, > an excellent question. A broader one is what is it that attracts birds to > the outfalls? The warm temperature of the discharge? it seems that a lot of > the herring and great black-backed gulls that used to frequent the Point > Pleasant Park outfalls were just bathing. Lots of preening, wind fluttering, > etc. is the attraction the fish that are themselves attracted to this warm > water? The sewage itself? > Dusan Soudek > From: Joanne Cook > Sent: Sunday, January 04, 2015 5:44 PM > To: naturens@chebucto.ns.ca > Subject: Re: [NatureNS] Sewer Strolls: Before and After Harbour Cleanup ? > Dusan, > > I was wondering the same thing yesterday, and also wondering about the > temperature of the current effluent, and what effects it has - if any - > where it emerges. > > cheers, > Joanne > > > > ____________________________________ > Do not meddle with the Forces of Nature, for you are small, insignificant, > and biodegradable. > ____________________________________ > On Sun, Jan 4, 2015 at 5:25 PM, Dusan Soudek <soudekd@ns.sympatico.ca> > wrote: > > Just curious: Have there been any noticeable changes in the numbers and > species of waterfowl associated with Halifax Harbour sewer outlets since the > Harbour Solutions project was completed? Only a small percentage of the > city’s raw sewage gets dumped into the harbour these days, more so after > periods of heavy rainfall when the sewage plants are overwhelmed by > discharge from combined sewers... > Dusan Soudek > > > > > No virus found in this message. > Checked by AVG - www.avg.com > Version: 2015.0.5577 / Virus Database: 4257/8882 - Release Date: 01/06/15
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