NDLI: Factors regulating epilithic biofilm carbon cycling and release with nutrient enrichment in headwater streams : Stream biofilm carbon cycling

Content Provider	Springer Nature Link
Author	Ziegler, Susan E. Lyon, David R.
Copyright Year	2010
Abstract	This study uses the results from in situ 13C-labeling experiments conducted in six streams representing a gradient in nutrient enrichment to explore how nutrient availability, stoichiometry, and the composition of active biofilm phototrophs may regulate C cycling in epilithic biofilms. Carbon cycling was tracked through epilithic biofilm communities by assessing net primary production (NPP) and 13C-labeling of biofilm phospholipids fatty acids (PLFA), and stream water dissolved organic carbon (DOC) within light and dark enclosure incubations. We used generalized linear models coupled with an information-theoretic approach for model selection to assess which factors most influenced C exchange within and DOC release from these biofilms. The ratio of new C incorporated into heterotrophic bacterial PLFA ia15:0 to total polyunsaturated fatty acids (PUFA) indicated that greatest algal–bacterial exchange occurred in the two most nutrient-poor streams. Further, this ratio was best predicted by newC18:3ω3/PUFA suggesting increased relative activity of some algae relates to reduced algal–bacterial C exchange within these biofilms. Net release of DOC represented 2–45% of NPP with greatest release of DOC having occurred in the two most nutrient-rich streams. Further, the model selection indicated that newC18:3ω3/PLFA was the only highly plausible explanatory factor for net DOC release, while a combination of NPP and newC18:3ω3/PLFA was a strong predictor of the quantity of new C released as DOC. The results presented here indicate factors regulating or correlating with the activity of green algae in these biofilms regulated the exchange of C within and DOC release from these biofilms. This suggests increased algal exudation and greater biofilm development with nutrient enrichment may increase DOC release but reduce bacterial use of autochthonous C within these biofilms.
Starting Page	71
Ending Page	88
Page Count	18
File Format	PDF
ISSN	00188158
Journal	Hydrobiologia
Volume Number	657
Issue Number	1
e-ISSN	15735117
Language	English
Publisher	Springer Netherlands
Publisher Date	2010-05-20
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Dissolved organic carbon Bacterial–algal exchange Exudation 13C-PLFA Carbon cycling Epilithic biofilm Zoology Ecology Freshwater & Marine Ecology
Content Type	Text
Resource Type	Article
Subject	Aquatic Science

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