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Let me append to your last sentence, =E2=80=9C=E2=80=A6 especially if =
the houses have lawns going all the way down to the lakeshore.=E2=80=9D =
=20
Never did understand fertilizing lawns, but it=E2=80=99s worse if the =
lawns are on a water body.=20
=20
From: naturens-owner@chebucto.ns.ca =
[mailto:naturens-owner@chebucto.ns.ca] On Behalf Of David Webster
Sent: May 31, 2020 12:56 PM
To: naturens@chebucto.ns.ca
Subject: Re: [NatureNS] Winning submissions to Biomimicry contest for =
Youth
=20
Hi John & All,
After a long lapse; getting back to eutrophication.=20
Nutrient rich waters tend to get bad press because, if some limiting =
element (P usually) becomes high then blooms of usually toxic (always ?) =
Blue Green algae are likely. They can fix N so, given ample P, grow like =
weeds then, unlike weeds die, decay etc.
But nutrient poor water is also undesirable; crystal clear water =
devoid of life as in some glacial lakes. As with most matters, a =
Goldilocks balance is desirable.
There was a good article in American Scientist 65(2): 159-170, 1977; =
The Plant-Animal interface in Freshwater Ecosystems; Karen Glaus Porter =
and by good luck I found it.=20
I was especially impressed by "In periods of peak zooplankton =
abundance....the grazer community filtered the entire volume of water in =
a eutrophic (nutrient rich) lake as many as 4.69 times (469%) during one =
day." This was measured using C14.=20
And yes the fertilized and mowed lawn right down to the water is an =
effective way to mess up a lake. But nothing kills a small lake, with =
small water flow, as efficiently as year round houses and septic tanks.=20
YT, DW, Kentville
=20
YT, DW, Kentville
On 5/28/2020 5:24 AM, John and Nhung wrote:
I followed the link, and it does look interesting.
=20
I predict that eutrophication will be a growing problem here, as well, =
if summers get hotter and drier and predicted (Dare we say =E2=80=A6 as =
being experienced?=E2=80=9D) Our studies down here in God=E2=80=99s =
country over the years have been showing a positive relation between =
rainfall and water colour (which can be translated as dissolved humic =
material). When rainfall is low, colour levels drop, and lakes appear =
susceptible to blooms at lower levels of nutrient. Kinda makes sense: =
light penetration is greater when colour is lower and some of those =
organic molecules may react with nutrients.
=20
We suspect phosphorus of being a greater problem that nitrogen in our =
lakes, but the idea is still interesting.
=20
In the meantime, lake and river front property owners can help by =
leaving their shorelines the blazes alone. Wild shorelines do a great =
job of absorbing nutrients and runoff, thereby controlling turbidity, as =
well. Folks, those nice lawns going all the way down to the lake are =
a terrible idea, especially if you fertilize them! =20
=20
Something else to worry about: The science of cyanotoxicology is =
evolving, but they keep discovering a growing number of very nasty =
toxins in blue-green algae. The effects they have on us humans varies, =
but the mix includes carcinogens and some neurotoxins, for a start.
=20
Public education helps, and so do municipal by-laws. But a lot more =
education is needed, and we need PROVINCIAL regulations to control the =
fun and games still being played on lake shores. Regulations with =
consequences for both contractors and property owners.
=20
I could write a lot more but for God=E2=80=99s sake, keep lake shores =
wild!
=20
From: naturens-owner@chebucto.ns.ca =
[mailto:naturens-owner@chebucto.ns.ca] On Behalf Of N Robinson
Sent: May 27, 2020 8:48 PM
To: naturens@chebucto.ns.ca
Subject: [NatureNS] Winning submissions to Biomimicry contest for Youth
=20
"Only in the U.S.A., you say? Pity..."=20
=20
https://mailchi.mp/biomimicry/2020ydcwinners?e=3D9bfd59afac
=20
3rd place, The Bay Protector, may be of interest - dealing with =
eutrophication. =20
=20
Nancy
=20
=20
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