Document Detail

Endpoint 'floating leaves' of potamogeton natans: a new method to evaluate the development of macrophytes in pond mesocosms.
MedLine Citation:
PMID:  17561778     Owner:  NLM     Status:  MEDLINE    
GOAL, SCOPE AND BACKGROUND: One of the advantages of long-term mesocosm experiments as compared to short-term standard toxicity tests in the laboratory is the potential for detecting secondary effects due to the interaction of species and recovery with biomass of macrophytes being an important endpoint. However, generating biomass data by harvesting is often laborious, time-consuming, costly and restricted to the end of the experiment. Moreover, valuable information may get lost, in particular in single application studies, since maximal primary effects and secondary effects or recovery occur per se at different times. Potamogeton natans was used as an example in order to test whether number and area of floating leaves can be reliably measured and be used as intermediate and final end-points in mesocosm effect studies. METHODS: Digital photos, which were taken of the water surface in the course of an indoor pond mesocosm study on herbicide effects, were subjected to image analysis. The results were compared to wet weight and ash-free dry weight of Potamogeton at the end of the herbicide study. RESULTS AND DISCUSSION: Both number and area of floating leaves indicated the same herbicide effects as wet weight and ash-free dry weight of Potamogeton. Error introduced by the different work steps is small and can be further minimised by a number of method improvements. RECOMMENDATIONS AND PERSPECTIVES: In indoor mesocosm studies, errors due to the perspective adjustment may be circumvented by taking the photos perpendicular to the water surface. Correction for lens aberration, identical light conditions and the use of fluorescence images are considered promising. Field applications are proposed.
Rüdiger Berghahn; Silvia Mohr; Michael Feibicke; Stefan Meinecke; Erik Sperfeld
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Environmental science and pollution research international     Volume:  14     ISSN:  0944-1344     ISO Abbreviation:  Environ Sci Pollut Res Int     Publication Date:  2007 May 
Date Detail:
Created Date:  2007-06-12     Completed Date:  2007-07-11     Revised Date:  2009-08-14    
Medline Journal Info:
Nlm Unique ID:  9441769     Medline TA:  Environ Sci Pollut Res Int     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  190-3     Citation Subset:  IM    
Federal Environmental Agency, Schichauweg 58, 12307 Berlin, Germany.
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MeSH Terms
Fresh Water
Herbicides / toxicity*
Plant Leaves / anatomy & histology,  drug effects,  growth & development
Potamogetonaceae / anatomy & histology,  drug effects,  growth & development*
Toxicity Tests / methods
Reg. No./Substance:

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