Dr Tim Kedwards tim.t.j.kedwards at gbjha.zeneca.com
Fri Jun 28 02:53:24 EST 1996

Please find attached below details of the forthcoming workshop. If you require any further 
information feel free to contact me directly.



Dr Tim Kedwards
ZENECA Agrochemicals
Ecological Risk Assessment Section
Jealott's Hill Research Station
Bracknell, UK
RG42 6ET

Tel:		+44 (0) 1344 414107
Fax:		+44 (0) 1344 414124
Email:		Tim.T.J.Kedwards at gbjha.zeneca.com
Disclaimer:-	'The opinions expressed herein are my personal opinions
		and do not necessarily represent those of my employer'



Saturday, 16 November 1996, 8:30 - 5:30, Washington Hilton and Towers
Presented in conjunction with the SETAC 17th Annual Meeting, 
Washington, D.C.

Frameworks for ecological risk assessment often culminate in the 
evaluation of effects under simulated or actual environmental conditions.
 A fundamental objective of such semi-field and field studies is to investigate
effects at the community and ecosystem level.  To this end, data are collected on 
a large number of  ecological variables, including manipulative experiments (artificial
streams, mesocosms, terrestrial field trials), environmental monitoring (before/after,
upstream/downstream), and ecological surveys (plants, bird census).

Data from these studies are usually evaluated by using univariate 
statistics (e.g. analysis of variance, concentration-response regression).  These have 
limitations because it is only possible to look at a limited number of variables 
within the ecosystem at any one time, limiting effects determination to the 
population level, whereas the objective is normally to understand effects at higher 
levels of organization.

The advent of greater computing power and recent developments of new 
multivariate statistical tools has made available a variety of techniques (e.g. 
CANOCO, RIFFLE, PRIMER) with the potential to overcome some of these previous 
limitations.  Consequently, there is growing interest among ecotoxicologists in 
applying such techniques to field studies in order to be able to generate true 
community and ecosystem endpoints.  This workshop will provide an excellent 
opportunity for interested individuals to meet and exchange views on these approaches
and allow developers of the statistical approaches to discuss the development and
application of the techniques.  

The objective of this workshop is to provide information on and  generate discussion
of multivariate statistical techniques in ecotoxicological field studies, focusing on the
application of techniques for generating community and ecosystem level statistics,
rather than mathematical derivation.

Attendance will be limited to 100 people to maximize information 
Registration is first-come, first served.  The registration fee is 
$255, and forms can be obtained from the SETAC Office.

Workshop proceedings will be provided to all registrants at no 
additional cost, and will be available for purchase by others after the workshop.

                         SETAC Office
                    1010 North 12th Avenue
                   Pensacola, Florida  32501
     T 904-469-1500    F 904-469-9778    E setac at setac.org

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