[NatureNS] Sewer Strolls: Before and After Harbour Cleanup ?

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&lt;DIV&gt;&lt;B&gt;Subject:&lt;/B&gt; 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.
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