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Subject: Re: PAR Sensors
From: Michael Lizotte <[log in to unmask]>
Reply-To:Michael Lizotte <[log in to unmask]>
Date:Fri, 7 Jun 1996 08:34:18 -0500

text/plain (16 lines)

I would clarify one point in agreeing with William Henley: remember that a
"flat response" can be a slope if the units are photons (einsteins) rather
than energy (watts), as mentioned by Phillip Orr.  The main point is that
you cannot build a universal weighted spectrum PAR sensor to cover all the
possibilities with algae (amongst taxa or even for acclimation by a single
species).  For algae, a  spectrally-weighted light intensity, which would be
important to know where light is limiting photosynthesis, can be calculated
as something like Photosynthetically Usable Radiation (PUR: Morel, 1978,
Deep-Sea Res. 25:673-688).  Estimating PUR requires knowledge of the
spectrum of light and the absorption spectrum of the algae.
Michael P. Lizotte                      //tel. 414-424-0845
Department of Biology & Microbiology    //fax  414-424-0845
University of Wisconsin Oshkosh         [log in to unmask]
800 Algoma Blvd.
Oshkosh, WI  64901-8640

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