Spatial and temporal variability in recruitment of the cyanobacterium Gloeotrichia echinulata in an oligotrophic lake

  • Carey C
  • Weathers K
  • Ewing H
 et al. 
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Recruitment from dormant stages in the benthos can provide a critically important inoculum for sur- face populations of phytoplankton, including bloom-forming cyanobacteria. For example, water-column popu- lations of the large (1–3-mm diameter) colonial cyanobacterium Gloeotrichia echinulata (Smith) P. Richter can be strongly subsidized by benthic recruitment. Therefore, understanding controls on recruitment is essential to an investigation of the factors controlling Gloeotrichia blooms, which are increasing in low-nutrient lakes across northeastern North America. We quantified surface abundances and recruitment from littoral sediments at multiple near-shore sampling sites in oligotrophic Lake Sunapee, New Hampshire, USA, during the summers of 2005–2012 and used this data set—the longest known record of cyanobacterial recruitment—to investigate potential drivers of interannual differences in Gloeotrichia recruitment. We found extensive spatiotemporal variability in recruitment. Recruitment was higher at some sites than others, and within seasons, recruitment into replicate traps at the same site was generally more similar than recruitment at different sites. These data suggest that local factors, such as substrate quality or the size of the seed bank, may be important controls on recruitment. Benthic recruitment probably accounted for

Author-supplied keywords

  • akinetes
  • and adverse e ff
  • benthic
  • climate change
  • cyanobacteria can impair the
  • dormancy
  • ects on planktonic
  • food webs
  • functioning of freshwater
  • havens 2008
  • lake strati fi cation
  • lakes via toxicity
  • pelagic coupling
  • phytoplankton
  • reviewed by paerl 1988
  • scums
  • there-

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  • Cayelan C Carey

  • Kathleen C Weathers

  • Holly A Ewing

  • Meredith L Greer

  • Kathryn L Cottingham

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