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This is a multi-part message in MIME format. ------=_NextPart_000_0057_01D029FB.1FF58AA0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable 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=20 Sent: Tuesday, January 06, 2015 8:19 PM To: naturens@chebucto.ns.ca=20 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 -----=20 From: Dusan Soudek=20 To: naturens@chebucto.ns.ca=20 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...=20 Dusan Soudek=20 On January 6, 2015 at 12:40 PM jen cooper <iffercooper@hotmail.com> = wrote:=20 Hello all,=20 I can't speak to Halifax Harbour but for comparison...=20 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.=20 My two cents on why, are these:=20 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.=20 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.=20 :) Jen=20 -------------------------------------------------------------------------= --- From: soudekd@ns.sympatico.ca=20 To: naturens@chebucto.ns.ca=20 Subject: Re: [NatureNS] Sewer Strolls: Before and After Harbour = Cleanup ?=20 Date: Sun, 4 Jan 2015 18:21:18 -0400=20 Joanne,=20 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?=20 Dusan Soudek=20 From: Joanne Cook=20 Sent: Sunday, January 04, 2015 5:44 PM=20 To: naturens@chebucto.ns.ca=20 Subject: Re: [NatureNS] Sewer Strolls: Before and After Harbour = Cleanup ?=20 Dusan,=20 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.=20 cheers,=20 Joanne=20 ____________________________________=20 Do not meddle with the Forces of Nature, for you are small, = insignificant, and biodegradable.=20 ____________________________________=20 On Sun, Jan 4, 2015 at 5:25 PM, Dusan Soudek = <soudekd@ns.sympatico.ca> wrote:=20 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=E2=80=99s 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...=20 Dusan Soudek=20 =20 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 ------=_NextPart_000_0057_01D029FB.1FF58AA0 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable <HTML xmlns=3D"http://www.w3.org/1999/xhtml"><HEAD> <META content=3D"text/html; charset=3DUTF-8" http-equiv=3DContent-Type> <META name=3DGENERATOR content=3D"MSHTML 8.00.6001.23588"> <STYLE></STYLE> </HEAD> <BODY dir=3Dltr bgColor=3D#ffffff> <DIV dir=3Dltr> <DIV style=3D"FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE: 12pt"> <DIV>I can see that a well-deigned and properly maintained (i.e., = mechanically=20 aerated) sewage lagoon or engineered marsh can support a highly diverse = and=20 productive ecosystem. But not if the decomposing sewage makes the water = column=20 anoxic. Nothing but anaerobic bacteria survive there...</DIV> <DIV>Dusan Soudek</DIV> <DIV> </DIV> <DIV=20 style=3D"FONT-STYLE: normal; DISPLAY: inline; FONT-FAMILY: 'Calibri'; = COLOR: #000000; FONT-SIZE: small; FONT-WEIGHT: normal; TEXT-DECORATION: = none"> <DIV style=3D"FONT: 10pt tahoma"> <DIV> </DIV> <DIV style=3D"BACKGROUND: #f5f5f5"> <DIV style=3D"font-color: black"><B>From:</B> <A = title=3Ddwebster@glinx.com=20 href=3D"mailto:dwebster@glinx.com">David & Alison Webster</A> </DIV> <DIV><B>Sent:</B> Tuesday, January 06, 2015 8:19 PM</DIV> <DIV><B>To:</B> <A title=3Dnaturens@chebucto.ns.ca=20 href=3D"mailto:naturens@chebucto.ns.ca">naturens@chebucto.ns.ca</A> = </DIV> <DIV><B>Subject:</B> Re: