+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

Algal community response to experimental and interannual variation in hydrology in an Alaskan boreal fen

Algal community response to experimental and interannual variation in hydrology in an Alaskan boreal fen

Freshwater Science 32(1): 1-11

Floristic studies indicate the abundance of microalgae in northern boreal peatlands, but we know relatively little about their ecology or how they will respond to changes in environmental conditions expected in this region as climate changes. We examined changes in algal community structure at sites exposed to a long-term water-table manipulation, including drought (lowered water-table treatment), flooding (raised water-table treatment), and control (no manipulation) treatments in an Alaskan fen. In previous years, continuous algal colonization typically would have occurred only in the raised water-table treatment, but a spring flood inundated experimental plots and provided a unique opportunity to examine algal community response to rewetting after long-term drought. This event allowed us to investigate how much ecosystem memory of the antecedent water-table manipulations regulated the ability of taxa to recolonize sites after prolonged drought compared to sites that had been continuously flooded. Despite no differences in water-table position among treatments at the time of sampling, surface-water nutrient concentrations were higher in the lowered water-table treatment relative to the other treatments after the spring thaw. This difference corresponded with greater algal abundance and biovolume in the lowered water-table treatment relative to the control and raised water-table treatments. Higher abundance and biovolume was driven mainly by filamentous green algae (Chlorophyta), especially Oedogonium, Spirogyra, and Microspora. Diatoms were most abundant in the raised water-table treatment, whereas chrysophytes were most abundant in the control treatment. Across all water-table treatments, N-fixing cyanobacteria increased as nutrients and water-table position declined over time. The differences in algal community structure among water-table treatments suggest that alternating drought and flooding events expected with climate change may significantly alter algal-driven functions in boreal wetlands.

Please choose payment method:

(PDF emailed within 0-6 h: $19.90)

Accession: 037390779

Download citation: RISBibTeXText

DOI: 10.1899/11-131.1

Related references

Interannual variation of the algal invertebrate turf community in a central california giant kelp forest. American Zoologist 28(4): 31A, 1988

Interannual variation in copepod nauplii prey of larval fish in an alaskan bay. ICES Journal of Marine Science 48(2): 157-166, 1991

Nematode community shifts in response to experimental warming and canopy conditions are associated with plant community changes in the temperate-boreal forest ecotone. Oecologia 175(2): 713-723, 2014

Interannual variation and climatic regulation of the CO2 emission from large boreal lakes. Global Change Biology 11(8): 1368-1380, 2005

Response of plant community structure and primary productivity to experimental drought and flooding in an Alaskan fen 1. Canadian Journal of Forest Research 45(2): 185-193, 2015

Flood disturbance, algal productivity, and interannual variation in food chain length. Oikos 90(1): 20-27, 2000

Flood Disturbance, Algal Productivity, and Interannual Variation in Food Chain Length. Oikos 90(1): 20-27, 2000

Vertical tilt structure of East Asian trough and its interannual variation mechanism in boreal winter. Theoretical and Applied Climatology 115(3-4): 667-683, 2014

Effects of Acidification and Alkalinization on a Periphytic Algal Community in an Alaskan Wetland. Wetlands 30(6): 1193-1202, 2010

Interannual variation in diatom bloom dynamics: roles of hydrology, nutrient limitation, sinking, and whole lake manipulation. Water Research 41(12): 2551-2562, 2007

Zooplankton community response to experimental acidification in boreal shield lakes with different ecological histories. Canadian Journal of Fisheries and Aquatic Sciences 64(6): 887-898, 2007

Spatial and temporal variation in moss-associated dinitrogen fixation in coniferous- and deciduous-dominated Alaskan boreal forests. Plant Ecology 219(7): 837-851, 2018

Pinus and Betula pollen accumulation rates from the northern boreal forest as a record of interannual variation in July temperature. JQS. Journal of Quaternary Science 24.5, 2009

Plant community composition as a predictor of regional soil carbon storage in Alaskan boreal black spruce ecosystems. Ecosystems 11(4): 629-642, 2008

Hydrology is reflected in the functioning and community composition of methanotrophs in the littoral wetland of a boreal lake. Fems Microbiology Ecology 75(3): 430-445, 2011