Cross‐taxon congruence in lake plankton largely independent of environmental gradients

Özkan, Korhan; Davidson, Thomas A.; Søndergaard, Martin; Lauridsen, Torben L.; Bjerring, Rikke; Johansson, Liselotte S.; Svenning, Jens‐Christian

doi:10.1890/13-2141.1

Cited by 36 publications

(26 citation statements)

References 70 publications

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“…N and P have been recognised as co-limiting factors of plankton abundance in shallow lake ecosystems [74][75][76] and they are thus significantly related to the diversity of phytoplankton [77] and submerged macrophytes [76]. Therefore, the observed nutrient reduction in the study lakes might have increased phytoplankton richness by releasing the competitive pressure [78]; this, in turn, may have enhanced the zooplankton richness by allowing niche partitioning [46,[79][80][81]. Analyses of 30 years' data on Lake Zurich also demonstrated a strong association of phytoplankton and zooplankton richness, pointing at the role of food web interactions in sustaining diversity across trophic levels [23].…”

Section: Discussionmentioning

confidence: 99%

“…Phyto-and zooplankton were counted and their biomass was estimated based on size and shape. Details on plankton sampling, identification and counting can be found in Özkan, et al [46]. All taxa were aggregated to genus level due to varying intensity of species-level identification between different plankton groups and potential differences in the identification skills of the taxonomists.…”

Section: Methodsmentioning

confidence: 99%

“…All taxa were aggregated to genus level due to varying intensity of species-level identification between different plankton groups and potential differences in the identification skills of the taxonomists. We screened the plankton data for potential inconsistencies and made corrections with an inclusive approach [46].…”

Section: Methodsmentioning

confidence: 99%

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Long-Term Trends and Temporal Synchrony in Plankton Richness, Diversity and Biomass Driven by Re-Oligotrophication and Climate across 17 Danish Lakes

Özkan

Davidson

Bjerring

et al. 2016

Water

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A two-decade (1989)(1990)(1991)(1992)(1993)(1994)(1995)(1996)(1997)(1998)(1999)(2000)(2001)(2002)(2003)(2004)(2005)(2006)(2007)(2008) time series of lake phyto-and zooplankton, water characteristics and climate in 17 Danish lakes was analysed to examine the long term changes and the effects of lake restoration efforts. The analyses of the pair-wise correlations across time series revealed a strong synchrony in climatic variables among the lakes. A significant, but weak increase in air temperature was observed and resulted in a corresponding increase in surface water temperature only in summer. Lake physico-chemical variables had weaker synchrony than climatic variables. Synchrony in water temperature and stratification was stronger than lake chemistry as the former is mostly affected by atmospheric energy flux. Synchrony in the taxonomic richness of the plankton groups and phytoplankton biomass was apparent, to a similar degree as observed for lake chemistry. The synchrony and the temporal trends in lake chemistry and plankton were more pronounced for the lakes with strong re-oligotrophication. Phytoplankton biomass decreased and plankton richness increased in these lakes, with a shift from Chlorophyta dominance towards more heterogeneous phytoplankton communities. Notably, a widespread significant positive trend in plankton richness was observed not only in lakes with strong re-oligotrophication but across all lakes. The widespread increase in plankton richness coincided with widespread decrease in phosphate and total nitrogen concentrations, as well as with the trends in climate indicating a likely joint effect of nutrient reduction and climate in driving lake plankton. However, temporal changes and synchrony as well as the recovery of richness and composition of lake plankton more coherently corresponded with the nutrient loading reduction across the Danish landscape, while the role of climate control of the lake plankton was less pronounced.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Long-Term Trends and Temporal Synchrony in Plankton Richness, Diversity and Biomass Driven by Re-Oligotrophication and Climate across 17 Danish Lakes

Özkan

Davidson

Bjerring

et al. 2016

Water

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“…In freshwater ecosystems, rather weak but significantly congruent community patterns have been reported between various taxonomic groups (Johnson and Hering, 2010;Özkan et al, 2014). This taxonomic congruence may be due to similar responses to environmental gradients or due to interactions among biological groups (Johnson and Hering, 2010;Padial et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Unravelling the drivers of aquatic communities using disparate organismal groups and different taxonomic levels

Vilmi

Karjalainen

Nokela

et al. 2016

Ecological Indicators

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“…crosstaxon congruence, is one of the most significant challenges facing ecologists, biogeographers, and conservation biologists (Özkan et al, 2014;Rooney & Azeria, 2015;Su, Debinski, Jakubauskas, & Kindscher, 2004;Tisseuil et al, 2013). crosstaxon congruence, is one of the most significant challenges facing ecologists, biogeographers, and conservation biologists (Özkan et al, 2014;Rooney & Azeria, 2015;Su, Debinski, Jakubauskas, & Kindscher, 2004;Tisseuil et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Cross‐taxon congruence of multiple diversity facets of freshwater assemblages is determined by large‐scale processes across China

Molinos

et al. 2019

Freshwater Biology

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An intensively debated issue in ecology is whether variability in the patterns of diversity of different groups of organisms is congruent in space, a phenomenon referred to as cross‐taxon congruence. Whereas this has been previously mainly tested in terms of taxonomic dissimilarity, the role of ecological processes in determining the congruence of multiple diversity facets (i.e. α‐ and β‐diversity, taxonomic, and functional) remains poorly understood. We used a data set of observation records for 469 macrophyte and 543 fish taxa at the catchment‐scale from the existing literature and data bases to test the existence of multi‐faceted congruence patterns and investigate the variables driving them across 214 catchments covering the whole Chinese mainland. We found cross‐taxon congruence of multiple diversity aspects between fish and macrophyte communities. The energy (i.e. diversity is limited by energy availability), area/environmental heterogeneity (i.e. diversity is higher in larger and more heterogeneous areas), and dispersal (i.e. diversity is driven by dispersal) hypotheses were all significantly attributed to the cross‐taxon congruence, suggesting the existence of key repeated mechanisms underlying assemblage organisation. Our study provides new evidence that can further our understanding of the factors and underlying processes explaining cross‐taxon congruence patterns at broad spatial scales in the freshwater realm, the studies of which significantly lag those in the marine and terrestrial realms. The present findings also provide important baseline information for freshwater conservation initiatives.

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Cross‐taxon congruence in lake plankton largely independent of environmental gradients

Abstract: Note: Winter samples were excluded due to varying sampling intensity across years. KORHAN Ö ZKAN ET AL.

Cited by 36 publications

References 70 publications

Long-Term Trends and Temporal Synchrony in Plankton Richness, Diversity and Biomass Driven by Re-Oligotrophication and Climate across 17 Danish Lakes

Long-Term Trends and Temporal Synchrony in Plankton Richness, Diversity and Biomass Driven by Re-Oligotrophication and Climate across 17 Danish Lakes

Unravelling the drivers of aquatic communities using disparate organismal groups and different taxonomic levels

Cross‐taxon congruence of multiple diversity facets of freshwater assemblages is determined by large‐scale processes across China

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