[Odonata-l] RFI - Bti and Bsph larvicides - indirect effects on non-targets (including Odonata)

[Kathy &/or Dave Biggs]

Colin,

Please let me know what you hear back.

My own experience is that, in my 22' backyard pond where I've used Bti 
for ~5 years, the # of both dragonflies and tadpoles maturing in the 
pond is down. I'm assuming that the dragonfly nymph are eating each 
other for prey more, and also the tadpoles. This concerns me mainly in 
that the frogs are in trouble worldwide.....and I miss seeing all the 
Cardinal Meadowhawks emerging. Now I get mostly Darners.

Cheers!!
Kathy Biggs

-- 
California Dragonflies	       http://www.sonic.net/dragonfly
Southwest Dragonflies	       http://southwestdragonflies.net/
Bigsnest Wildlife Pond	       http://www.bigsnestpond.net/
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Kathy and Dave Biggs	       bigsnest at sonic.net      707-823-2911
308 Bloomfield Rd.             Sebastopol, CA  95472 
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http://www.sonic.net/~bigsnest/azaleacreekpublishing/ 
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Jones, Colin (MNR) wrote:

> Hi all,
>
>  
>
> Does anyone know of any studies and resulting literature looking at 
> the effects on non-target organisms (e.g. Odonata) due to the use of 
> Bti and Bsph to control mosquitoes?
>
>  
>
> I know that quite a bit of work has been done on direct effects to 
> non-targets (largely concluding the effects to be minimal) but I don't 
> know of any work that has examined the indirect effects (i.e., 
> ecological effects related to reduced prey availability, for example). 
> Is anyone aware of any work that has, or is currently being done, in 
> this field? If so, are you able to point me to published or 
> unpublished literature or preliminary findings?
>
>  
>
> Thanks in advance for any help you can provide.
>
>  
>
> Cheers,
>
>  
>
> Colin
>
> */ _______________________________ /**/ /*
>
> */ Colin Jones
> /*// Natural Heritage Project Zoologist ///
> // Natural Heritage Information Centre //
> // Ontario Ministry of Natural Resources //
> // 705-755-2166 //
> // colin.jones at ontario.ca <mailto:colin.jones at ontario.ca> //
> / // http://nhic.mnr.gov.on.ca/nhic_.cfm //
>
> // Working with conservation partners to track Ontario 's biodiversity //
>
>  
>
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>
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