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Journal of Plankton Research Vol.25 no.1 pp.111-117, 2003
© Oxford University Press 2003

SHORT COMMUNICATION

Solar ultraviolet photodegradation of DOC may stimulate freshwater food webs

Hendrika J. De Lange1,*, Donald P. Morris and Craig E. Williamson

Department of Earth and Environmental Sciences, 31 Williams Drive, Lehigh University, Bethlehem, Pa 18015-3188, USA

* Corresponding Author: marieke.delange{at}wur.nl

1 Present Address: Aquatic Ecology And Water Quality Management Group, Department Of Environmental Sciences, Wageningen University, Po Box 8080, 6700 Dd Wageningen, The Netherlands

The UV component in solar radiation increased the availability of DOC for bacterial growth, and led to an increase in bacterial and bacterivore abundance in laboratory plankton cultures. UV radiation may thus stimulate ecosystem productivity by increasing dissolved organic carbon lability and facilitating the transfer of carbon to higher trophic levels via the microbial loop.


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