Is there light after depth? Distribution of periphyton chlorophyll and productivity in lake littoral zones
Vadeboncoeur, Y., Devlin, S., McIntyre, P. B., & Zanden, M. J. V. (2014). Is there light after depth? Distribution of periphyton chlorophyll and productivity in lake littoral zones. Freshwater Science, 33(2), 524-536. https://doi.org/10.1086/676315
Julkaistu sarjassa
Freshwater SciencePäivämäärä
2014Tekijänoikeudet
© 2014 by The Society for Freshwater Science. Published in this repository with the kind permission of the publisher.
Periphyton and phytoplankton contribute to the base of lake food webs, and both groups of microalgae
are influenced by resources and physical forcing. Spatial variation in light availability interacts with the physical
dynamics of the water column to create predictable depth gradients in resources and disturbance that may
differentially affect periphyton vs phytoplankton. We characterized the depth distribution of chlorophyll and
productivity of periphyton on sediments (epipelon) and phytoplankton in the euphotic zones of 13 oligomesotrophic
lakes that span a large size gradient (0.017–32,600 km2
). Epipelic chlorophyll usually increased with
depth in the epilimnion. Light was the primary driver of the consistent within-lake patterns in periphyton productivity
across this lake-size gradient. In 5 lakes, epipelic periphyton exhibited a unimodal distribution of productivity
with depth in the photic zone, but no evidence of photoinhibition was found for periphyton. Rather, patterns
in sediment N and P and observed changes in biofilm structure were consistent with determination of epipelic
biomass by disturbance at depths ≤1 m in the smaller lakes and by light limitation at depths >1 m. Further quantification
of the effects of disturbance on epipelon is needed. Nonetheless, our data demonstrate that the perceived
high spatial variability in periphyton biomass and productivity is not an impediment to development of robust
models of whole-lake primary production that include both phytoplankton and periphyton.
...
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North American Benthological SocietyISSN Hae Julkaisufoorumista
2161-9565Asiasanat
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https://converis.jyu.fi/converis/portal/detail/Publication/23735745
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