NDLI: Coupled use of sediment phosphorus speciation and pigment composition to infer phytoplankton phenology over 700 years in a deep oligotrophic lake

Content Provider	Springer Nature Link
Author	Kpodonu, Alfred Theodore N. K. Hamilton, David P. Hartland, Adam Laughlin, Daniel C. Lusk, Christopher H.
Copyright Year	2016
Abstract	Restoration and management of lake ecosystems require an understanding of natural variability in primary productivity and the factors that drive change. To understand long-term changes in, and relationships amongst phosphorus species and phytoplankton groups, a sediment core was retrieved from Lake Okataina in the central North Island of New Zealand. The core was dated to include a period of approximately 700 years, from pre-human settlement to its current state, close to natural reference conditions. Pigments representing different planktonic groups were measured vertically through the core at 1 cm intervals, as well as phosphorus fractions associated with apatite and CaCO3, Fe and Mn (oxy) hydroxides, Al (oxy) hydroxides and labile phosphorus. Highly significant correlations were established amongst the algal groups and the phosphorus species. Diatoms were strongly correlated with phosphorus fractions associated with permanent burial, while cyanobacteria and green algae were correlated with potentially bioavailable phosphorus. Green algae, cyanobacteria and cryptophytes co-dominated when diatom populations were reduced, and vice versa. Using multiple linear regression, phosphorus fractions could be used to hindcast historical variations in the composition of algal communities (as inferred from pigments), with the exception of alloxanthin (representative of cryptophytes). Our approach provides a technique for a relatively rapid assessment of long-term changes in the major phytoplankton groups in lakes and may be used to infer natural variability in the reference state as well as partitioning the extent of alteration of phytoplankton community composition between human and natural disturbances.
Starting Page	181
Ending Page	196
Page Count	16
File Format	PDF
ISSN	01682563
Journal	Biogeochemistry
Volume Number	129
Issue Number	1-2
e-ISSN	1573515X
Language	English
Publisher	Springer International Publishing
Publisher Date	2016-07-19
Publisher Place	Cham
Access Restriction	Subscribed
Subject Keyword	Algal pigments Phosphorus speciation Reference state Natural variability Invasive mammals Phenology Biogeosciences Ecosystems Environmental Chemistry Life Sciences
Content Type	Text
Resource Type	Article
Subject	Earth-Surface Processes Environmental Chemistry Water Science and Technology

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