10.5061/DRYAD.TP1CS
Török, Péter
Hungarian Academy of Sciences
T-Krasznai, Enikő
Department of Environment and Conservation
B-Béres, Viktória
Department of Environment and Conservation
Bácsi, István
University of Debrecen
Borics, Gábor
MTA Centre for Ecological Research
Tóthmérész, Béla
Hungarian Academy of Sciences
Data from: Functional diversity supports the biomass-diversity humped-back
relationship in phytoplankton assemblages
Dryad
dataset
2016
functional redundancy
humpback model
functional strategies
unimodal curve
ecological strategy
1992-2002
2016-12-14T00:00:00Z
2016-12-14T00:00:00Z
en
https://doi.org/10.1111/1365-2435.12631
2404461 bytes
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CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
Modelling the relationship between biomass and diversity in phytoplankton
assemblages provides new insights into the mechanisms responsible for the
coexistence of species, even in terrestrial ecosystems. We tested the
biomass–diversity relationship in lake phytoplankton along a wide biomass
gradient using functional species groups. We hypothesized that changes in
the taxonomic diversity of the phytoplankton along a biomass gradient are
associated with altered functional diversity. For the analyses, in total
768 samples were collected from 30 oxbows, reservoirs and lakes in the
Hungarian Lowland Region and analysed between 1992 and 2002. We found that
the diversity and also the number of functional species groups showed a
humped-back curve similar to the species richness. The changes in
functional group composition act as a good proxy for phytoplankton species
responses. We found that the peak of the number of strategy groups and
their Shannon diversity was at a much lower biomass than that of species
richness. We revealed the fine-scale effects of increasing the dominance
of respective species or species groups with increasing biomass. This
increase was well reflected by the changes in the functional
characteristics: first, the species evenness; then, the Shannon diversity;
and finally, the species richness started to decrease with increasing
biomass. Cyanoprokaryota were positively correlated with increasing
biomass and negatively with the increase in species richness; thus, the
high increase both in their abundance and biomass can be responsible for
the abruptly decreasing part of the humped-back curve. We detected a
humped-back curve between biomass and diversity, where the peak compared
to terrestrial plant communities tended to be towards high biomass scores,
that is, >60% instead of the 20–60% of the biomass range typical
for terrestrial plant communities. Marked differences in the structural
and dynamic features of phytoplankton assemblages and terrestrial plant
communities are likely responsible for this difference.
Phytoplankton and Enviromental variables dataPhytoplankton taxa with
individual biomass scores (768 samples, 896 species), Environmental
variables: total nitrogen (TN; 297 samples), total phosphorus (TP; 339),
total suspended solids (TSS; 351) and for Secchi depth (97 data). For TN
(summarised the amount of different nitrogen forms), TP (measured by the
acid molybdate method) and TSS (measured by the gravimetric method) the
Hungarian national guidelines were used. The site numbering follows the
order of Sampled Waterbodies table Supporting Information File of the
paper.Torok-et-al-Funct-Ecol-Funct-Div.xlsx
East Hungary