NDLI: Contrasting responses of dimictic and polymictic lakes to environmental change: a spatial and temporal study

Content Provider	Springer Nature Link
Author	Taranu, Zofia Ecaterina Köster, Dörte Hall, Roland I. Charette, Theo Forrest, Francine Cwynar, Les C. Gregory Eaves, Irene
Copyright Year	2009
Abstract	Although comparative analyses between dimictic and polymictic lakes have noted the key role of mixing regime in governing water quality, limnologists have historically focused on dimictic lakes, leaving polymictic lakes relatively understudied. In this study, we investigated whether the effects of agricultural development on water quality differed between dimictic and polymictic lakes in a naturally nutrient-rich region of Alberta, Canada. Through a spatial limnological analysis of 36 sites, we found that the relationship between surface water total phosphorus concentration and the percent of agriculture (% Agr) in the catchments differed between dimictic and polymictic lakes, where the proportion of variance explained was much more pronounced in the dimictic (79% explained) than in the polymictic systems (7% explained). Paleolimnological analyses of subfossil chironomids in surface sediment samples (0–1 cm) from 18 of the 36 study lakes, and in sediment core profiles from the dimictic and polymictic basins of a eutrophic lake, showed that water quality differed between mixis groups. We found that the surface sediment chironomid assemblages differed significantly between polymictic and dimictic lakes. Detailed analyses of the sediment cores demonstrated that the two basin types differed in their responses to land-use change through time, as only the dimictic basin showed a parallel increase in anoxia with increasing agricultural development. We suggest that in naturally-fertile landscapes, external nutrient loading exerts a more notable effect on dimictic lakes, whereas internal nutrient loading is more important in polymictic systems.
Starting Page	97
Ending Page	115
Page Count	19
File Format	PDF
ISSN	10151621
Journal	Aquatic Sciences
Volume Number	72
Issue Number	1
e-ISSN	14209055
Language	English
Publisher	SP Birkhäuser Verlag Basel
Publisher Date	2009-11-03
Publisher Place	Basel
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Eutrophication Chironomid Agriculture Mixis Anoxia Life Sciences Ecology Oceanography Marine & Freshwater Sciences Freshwater & Marine Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology Aquatic Science Water Science and Technology Ecology, Evolution, Behavior and Systematics

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