Holocene shifts in the primary producer community of large, shallow European Lake Peipsi, inferred from sediment pigment analysis
Laen...
Kuupäev
2019
Kättesaadavus
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Springer
Abstrakt
We used HPLC to identify and quantify
pigments in a Holocene sediment record from large,
shallow Lake Peipsi, Estonia. The aim of our study
was to track the influence of long-term climate change
(i.e. temperature fluctuations) on past dynamics of
aquatic primary producers. Sedimentary pigments
were separated and quantified in 182 samples that
span the last ca. 10,000 years. There was an increasing
trend in sedimentary pigment concentrations from
basal to upper sediment layers, suggesting a gradual
increase in lake trophic status through time. Using
additive models, our results suggested that primary
producer dynamics in Lake Peipsi were closely related
to temperature fluctuations. We, however, identified two periods (early Holocene and after ca. 2.5 cal ka
BP) when the relationship between primary producer
composition and temperature was weak, suggesting
the influence of additional drivers on the primary
producer community. We postulate that: (a) the
increase of primary producer biomass in the early
Holocene could have been caused by input of
allochthonous organic matter and nutrients from the
flooded areas when water level in Lake Peipsi was
increasing, and (b) changes in the abundance and
structure of primary producer assemblages since ca.
2.5 cal ka BP was related to widespread agricultural
activities in the Lake Peipsi catchment. These results
suggest that human activities can disrupt the relationship between the primary producer community and
temperature in large, shallow lakes.
This research was supported by institutional research grants IUT21-2, IUT1-8 and PRG323 and Estonian Science Foundation Grants Nos. 6741, 7888 and 9102. We acknowledge colleagues S. Veski, A. Heinsalu and J. Vassiljev for sediment coring and establishing the chronology, and A. Leeben for participating in the early stage of manuscript development. We are grateful for the comments and corrections made by two anonymous reviewers of the manuscript.
This research was supported by institutional research grants IUT21-2, IUT1-8 and PRG323 and Estonian Science Foundation Grants Nos. 6741, 7888 and 9102. We acknowledge colleagues S. Veski, A. Heinsalu and J. Vassiljev for sediment coring and establishing the chronology, and A. Leeben for participating in the early stage of manuscript development. We are grateful for the comments and corrections made by two anonymous reviewers of the manuscript.
Kirjeldus
Märksõnad
climate change, Holocene, paleolimnology, shallow lake, sedimentary pigments, Lake Peipsi, articles