Gradients, Species Richness and Communities in Eastern Finnish Sloping Fens

Laitinen, Jarmo T.; Oksanen, Jari; Kaakinen, Eero; Peterka, Tomáš; Moen, Asbjørn; Tahvanainen, Teemu

doi:10.5735/085.058.0415

Cited by 6 publications

(5 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As expected, the pH and concentrations of Ca and Mg were higher in the fen flarks than in transitional communities and bogs. Groundwater pH and Ca concentration are relatively low in the whole Fennoscandia due to glacial history and calcium‐poor bedrock (Hájek et al, 2021 ), and boreal fens with weak minerotrophy and poor mineral buffering capacity (Tahvanainen et al, 2002 ) are sensitive to acidification, which may increase susceptibility to Sphagnum increase and FBT (Tahvanainen, 2011 ). Once established, Sphagnum mosses can further lower pH by the production of organic acids and cation exchange (Clymo, 1963 , 1964 ; Schweiger & Beierkuhnlein, 2017 ).…”

Section: Discussionmentioning

confidence: 99%

“…In our study sites, DOC concentration was slightly but not significantly elevated in the transition zones, while in bogs DOC was significantly higher than in the fens and transition zones. Increased DOC concentrations likely connect to the lowered pH, as organic acids are mainly responsible for acidity in mire waters (Tahvanainen et al, 2002 ), but more detailed water chemical analyses and monitoring would be needed to assess the role of water chemistry.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Inference of future bog succession trajectory from spatial chronosequence of changing aapa mires

Kolari

Tahvanainen

2023

Ecology and Evolution

Self Cite

View full text Add to dashboard Cite

Climate change‐driven vegetation changes can alter the ecosystem functions of northern peatlands. Several case studies have documented fen‐to‐bog transition (FBT) over recent decades, which can have major implications, as increased bog growth would likely cause cooling feedback. However, studies beyond individual cases are missing to infer if a common trajectory or many alternatives of FBT are in progress. We explored plant community and hydrology patterns during FBT of 23 boreal aapa mire complexes in Finland. We focused on mires where comparisons of historical (1940–1970) and new (2017–2019) aerial photographs indicated an expansion of Sphagnum‐dominated zones. Vegetation plot and water chemistry data were collected from string‐flark fens, transition zones with indications of Sphagnum increase, and bog zones; thus, in a chronosequence with a decadal time span. We ask, is there a common trajectory or many alternatives of FBT in progress, and what are the main characteristics (species and traits) of transitional plant communities? We found a pattern of fen‐bog transitions via an increase in Sphagnum sect. Cuspidata (mainly S. majus and S. balticum), indicating a consistently high water table. Indicators only of transitional communities were scarce (Sphagnum lindbergii), but FBT had apparently facilitated shallow‐rooted aerenchymatous vascular plants, especially Scheuchzeria palustris. Water pH consistently reflected the chronosequence with averages of 4.2, 3.9, and 3.8, from fen to transition and bog zones. Due to weak minerotrophy of string‐flark fens, species richness increased towards bogs, but succession led to reduced beta diversity and homogenization among bog sites. Decadal chronosequence suggested a future fen‐bog transition through a wet phase, instead of a drying trend. Transitional poor‐fen vegetation was characterized by the abundance of Sphagnum lindbergii, S. majus, and Scheuchzeria palustris. Sphagnum mosses likely benefit from longer growing seasons and consistently wet and acidic conditions of aapa mires.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Inference of future bog succession trajectory from spatial chronosequence of changing aapa mires

Kolari

Tahvanainen

2023

Ecology and Evolution

Self Cite

View full text Add to dashboard Cite

show abstract

“…For areas of 3–4,000 m 2 , as those colonized by the target vegetation in the selected river sections, the ideal number of spatial replicas was set to six (Brusa et al, 2017). All plots were characterized in terms of species presence (both native and alien), and ground‐projected cover area estimated by geometric class centres (approximately corresponded to cover percentages of 71, 35, 18, 8.8, 4.4, 2.2, 1.1, 0.56, 0.28 and 0.14) as proposed by Oksanen (1976) and applied in comparable contexts by Bolpagni and Piotti (2016).…”

Section: Methodsmentioning

confidence: 99%

A longitudinal snapshot of pioneer plant patterns along lowland temperate rivers

Bolpagni

2022

River Research & Apps

View full text Add to dashboard Cite

Overexploitation of water, loss of dynamism and current climate change cause river drought and baseflow events that are globally increasingly intense and prolonged. This strongly affects riverine plant communities, especially those of seasonally exposed sediments. However, few data are available concerning this key component of river biodiversity currently. Furthermore, the role of alien species is expected to be important in riverbeds since fluvial corridors have an extraordinary susceptibility to be invaded and act as primary routes for invader dispersal. This study provides a systematic investigation of the longitudinal patterns of pioneer plants-in terms of richness and cover-in three mid-size rivers (Ticino, Adda and Oglio rivers) in northern Italy, from 15 different sampling sites. The alien plants dominated the pioneer richness (52 out of 91 species, 57% of the total richness found), whereas plant cover followed less-defined patterns. Along the upstream-downstream gradient, native plants showed a steep decline (À69% in richness and À52% in cover rates on average), only partially offset by the local (extremely variable) changes in alien taxa (À41% on average, in the range of À2.7 to +4.1 species per plot and with cover rates varying form À10 to +1,018%). The magnitude and sign of the detected trends strongly reflected individual river identity. Further investigations are required to better assess the role of hydromorphology in driving the riverine pioneer plant assemblages.

show abstract

“…The second example includes ordinal responses on a five‐degree Hult‐Sernander‐Du Rietz scale (Du Rietz, 1921; Oksanen, 1976). Vascular plant cover was recorded in n = 135 one‐square‐meter plots unequally divided over four transects (Cramer & Hytteborn, 1987).…”

Section: Worked Examplesmentioning

confidence: 99%

“…The second example includes ordinal responses on a five-degree Hult-Sernander-Du Rietz scale (Du Rietz, 1921;Oksanen, 1976).…”

Section: Fieldlayervegetationon Skabbholmenswedenmentioning

confidence: 99%

Concurrent ordination: Simultaneous unconstrained and constrained latent variable modelling

2022

View full text Add to dashboard Cite

In community ecology, unconstrained ordination can be used to indirectly explore drivers of community composition, while constrained ordination can be used to directly relate predictors to an ecological community. However, existing constrained ordination methods do not explicitly account for community composition that cannot be explained by the predictors, so that they have the potential to misrepresent community composition if not all predictors are available in the data. We propose and develop a set of new methods for ordination and joint species distribution modelling (JSDM) as part of the generalized linear latent variable model (GLLVM) framework, that incorporate predictors directly into an ordination. This includes a new ordination method that we refer to as concurrent ordination, as it simultaneously constructs unconstrained and constrained latent variables. Both unmeasured residual covariation and predictors are incorporated into the ordination by simultaneously imposing reduced rank structures on the residual covariance matrix and on fixed‐effects. We evaluate the method with a simulation study, and show that the proposed developments outperform canonical correspondence analysis (CCA) for Poisson and Bernoulli responses, and perform similar to redundancy analysis (RDA) for normally distributed responses, the two most popular methods for constrained ordination in community ecology. Two examples with real data further demonstrate the benefits of concurrent ordination, and the need to account for residual covariation in the analysis of multivariate data. This article contextualizes the role of constrained ordination in the GLLVM and JSDM frameworks, while developing a new ordination method that incorporates the best of unconstrained and constrained ordination, and which overcomes some of the deficiencies of existing classical ordination methods.

show abstract

Gradients, Species Richness and Communities in Eastern Finnish Sloping Fens

Cited by 6 publications

References 35 publications

Inference of future bog succession trajectory from spatial chronosequence of changing aapa mires

Inference of future bog succession trajectory from spatial chronosequence of changing aapa mires

A longitudinal snapshot of pioneer plant patterns along lowland temperate rivers

Concurrent ordination: Simultaneous unconstrained and constrained latent variable modelling

Contact Info

Product

Resources

About