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Thanks Steve, Dec 17, 2015
This =
http://www.rspb.org.uk/ourwork/conservation/advice/farmhedges/loss_gain.a=
spx
gives information and some background also. All hedgerows are equal but =
some are more equal than others.
DW
----- Original Message -----=20
From: Stephen Shaw=20
To: naturens@chebucto.ns.ca=20
Sent: Thursday, December 17, 2015 7:53 PM
Subject: Re: [NatureNS] UK Butterflies decline
To quantify Dave=92s comment a bit more from the same useful source =
that he has dug up (cited again below): 450,000 km of hedgerows were =
left by the 1990s, and 121,000 km had been lost, so the total aboriginal =
length in, say, the Middle Ages would have been ~571,000 km. A loss of =
121,000 km by the 1990s therefore represents a ~21.2 percent loss of the =
total original hedgerow in UK. Of the current remainder, 190,000 km are =
estimated to be species rich and =91ancient=92. =20
=20
Unusefully, the article doesn=92t say whether the losses have been =
concentrated more on the species rich hedgerows. If this were so, the =
losses of this superior habitat would have been greater than 21%. The =
poor condition of even the remaining hedgerow is attributed to excessive =
use of fertilizer and pesticides in intensive farming, and decline in =
traditional management practices. This article concerns hedgerows, and =
doesn=92t touch on the massive deforestation in much of the UK, to fuel =
such early practices as charcoal production for iron smelting.=20
On a comparative technical point, we've also been back several times =
in the last few years, using rental cars in England, Scotland and Wales. =
At least as the main driver, I couldn=92t hazard a guess at the state =
of the hedgerows because even though UK major road surfaces are =
generally much better maintained than here, traffic density and speed =
there in England at least is frightening these days, such that loss of =
attention for even a second or two to view the scenery would likely lead =
to annihilation. Parking a car on the side of the road is often now =
difficult to almost impossible, even in small villages. Next time I =
think we had better take a bus tour. =20
Steve (Hfx) =20
On Dec 17, 2015, at 10:32 AM, David & Alison Webster =
<dwebster@glinx.com> wrote:
Thanks Peter,
Perceived loss may depend upon the time frame involved and the =
specific area. According to =
http://www.wildlifetrusts.org/wildlife/habitats/hedgerows
some 121,000 km of hedgerows had been lost in the UK by the 1990.
This may be small or large relative to the total remaining; not =
sure.
I would expect the impact of habitat shrinkage on a population =
to frequently be delayed until some other factor, e.g. adverse weather, =
caused a dramatic decline in numbers. In such circumstances, sparse =
habitat, could readily preclude recovery.
Yt, Dave Webster, Kentville
----- Original Message -----
From: Hubcove@aol.com
To: naturens@chebucto.ns.ca
Sent: Wednesday, December 16, 2015 9:07 PM
Subject: Re: [NatureNS] UK Butterflies decline
In our frequent visits to the UK we haven't noticed much decline =
in hedgerows, probably because there are quite strict regulation =
governing their removal
Peter Stow
Hubbards
In a message dated 2015-12-16 8:32:43 P.M. Atlantic Standard Time, =
dwebster@glinx.com writes:
Hi Steve & All, Dec 16, 2015
It seems odd that there was no mention of the obvious; loss =
of hedgerows by consolidation of fields and crop specialization which =
would surely imply for some species not only loss of habitat but habitat =
fragmentation.
Yt, DW, Kentville=20
----- Original Message -----
From: Stephen Shaw
To: naturens@chebucto.ns.ca
Sent: Wednesday, December 16, 2015 6:38 PM
Subject: [NatureNS] UK Butterflies decline
Continuing an earlier thread, this short Guardian article =
summarizes a robust increase in a few, but drastic decline in many =
species, in UK. Causes unknown but pesticides and climate change among =
suspects fingered. =20
Steve (Hfx)
Begin forwarded message:
Subject: UK Butterflies decline
Date: December 15, 2015 at 11:57:09 AM AST
=
http://www.theguardian.com/environment/2015/dec/15/decline-in-over-three-=
quarters-uk-butterfly-species-final-warning-says-chris-packham?utm_source=
=3Desp&utm_medium=3DEmail&utm_campaign=3DGU+Today+main+Charity+appeal+151=
215&utm_term=3D143781&subid=3D14439812&CMP=3DEMCNEWEML6619I
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<DIV>Thanks Steve, =
=20
Dec 17, =
2015</DIV>
<DIV> This <A=20
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<DIV>gives information and some background also. All hedgerows are equal =
but=20
some are more equal than others.</DIV>
<DIV>DW</DIV>
<BLOCKQUOTE=20
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