Remarkable richness of aquatic macrophytes in 3-years old re-established Lake Fil, Denmark

Baastrup‐Spohr, Lars; Kragh, Theis; Petersen, K. R. L.; Moeslund, Bjarne; Schou, Jens C; Sand‐Jensen, Kaj

doi:10.1016/j.ecoleng.2016.06.081

Cited by 18 publications

(11 citation statements)

References 34 publications

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“…With the creation of many new, shallow, eutrophic Danish lakes, we had the opportunity to study the temporal immigration, establishment, and turnover of submerged macrophyte species. Macrophyte species managed to colonise the habitat shortly after a new lake was established, as also seen in previous studies (Aronson & Galatowitsch, 2008;Baastrup-Spohr, Kragh, et al, 2016). This positive effect of lake age on species richness, on average, persisted for about 20 years, whereas species richness decreased markedly in gradually older lakes (hypothesis 1).…”

Section: Species Colonisation and Richnesssupporting

confidence: 80%

“…Macrophyte species managed to colonise the habitat shortly after a new lake was established, as also seen in previous studies (Aronson & Galatowitsch, 2008;Baastrup-Spohr, Kragh, et al, 2016). Macrophyte species managed to colonise the habitat shortly after a new lake was established, as also seen in previous studies (Aronson & Galatowitsch, 2008;Baastrup-Spohr, Kragh, et al, 2016).…”

Section: Species Colonisation and Richnesssupporting

confidence: 80%

“…Only lower error bars are shown to avoid overlapping ββ-Lake age (years) Lake age (years) remote lakes, as documented in the new Lake Fil (Baastrup-Spohr, Kragh, et al, 2016). Right: The mean relative within-lake β-diversity of each of the lake groups partitioned into species replacement (grey) and changes in species richness (white).…”

Section: Species Colonisation and Richnessmentioning

confidence: 99%

“…Error bars are the standard error of the mean. Only lower error bars are shown to avoid overlapping remote lakes, as documented in the new Lake Fil (Baastrup-Spohr, Kragh, et al, 2016). Species may also derive from ditches or canals in the flooded area, and possibly by sprouting from the seed bank in the soil when a lake had been present at the location of the new lake many decades or even centuries earlier (Alderton et al, 2017;Bakker et al, 2013).…”

Section: Species Colonisation and Richnessmentioning

confidence: 99%

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Temporal development of biodiversity of macrophytes in newly established lakes

2019

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1. Every year, a vast number of wetlands are constructed to restore ecosystem function and biodiversity, thus counteracting massive historical losses by reclamation to farmland. However, our knowledge of the long-term effects on biodiversity, particularly of large systems such as lakes, is very limited.2. Our objective was to follow the development of macrophytes over 3-4 decades in 24 new, shallow, eutrophic lakes in order to test the hypotheses that: (1) species richness reaches a maximum after some years and then declines; and (2) species composition changes substantially from small early colonisers to taller, competitive later colonisers, which causes ongoing high β-diversity. A generalised linear mixed-effect model showed that species richness was relatedto lake size, phosphorus concentration and spatial setting, which are known to influence natural lakes as well. Moreover, species composition and richness were affected by lake age. Species colonised rapidly and richness peaked at an intermediate age and then declined.4. Temporal species turnover within lakes was high in three lake age groups of ≤10, 11-20 or >20 years since establishment, although lowest after 11-20 years.Species replacement tended to contribute most to β-diversity in the youngest lakes, whereas richness fluctuated in older lakes and appeared to contribute most to temporal turnover there. 5. Early colonisers in ≤10-year-old lakes were commonly replaced by tall canopyforming species in 11-20-year-old lakes, probably as a result of increasing competition for light and space over time. After 20 years, rootless Ceratophyllum submersum as well as species with floating and emergent leaves became dominant, potentially due to the gradual accumulation of more organic sediment difficult to root and grow in, along with gradually reduced light penetration in the water.6. Establishing new lakes for biodiversity remains a challenge because of the falling richness and continuous species turnover with lake age, but our results suggest that constructing large, nutrient-poor lakes in species-rich landscapes ensures the best prerequisites for obtaining diverse communities. K E Y W O R D Saquatic plants, community composition, ecological succession, restoration, wetlands

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Section: Species Colonisation and Richnesssupporting

confidence: 80%

Section: Species Colonisation and Richnesssupporting

confidence: 80%

Section: Species Colonisation and Richnessmentioning

confidence: 99%

Section: Species Colonisation and Richnessmentioning

confidence: 99%

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Temporal development of biodiversity of macrophytes in newly established lakes

2019

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“…Recruitment of new species following improved environmental conditions can be substantially delayed compared to changes in the environmental conditions (Sand‐Jensen et al., ). Slow recruitment can be due to absence of macrophyte‐rich habitats upstream or near the focal sites (Baastrup‐Spohr et al., ; Brederveld, Jahnig, Lorenz, Brunzel, & Soons, ; Dahlgren & Ehrlén, ). Also, the previous eutrophication can have impoverished sediment conditions for anchorage and root function of colonising macrophytes through accumulation of soft and easily degradable organic matter (Raun, Borum, & Sand‐Jensen, ; Sand‐Jensen & Møller, ; Valdemarsen et al., ).…”

Section: Discussionmentioning

confidence: 99%

Recovery of lake vegetation following reduced eutrophication and acidification

et al. 2017

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In recent decades, many aquatic ecosystems in Europe and North America have experienced reduced inputs of nutrients and acidifying substances because of improved sewage treatment and reduced emission of sulphur oxides. We evaluated the consequences of these efforts to changes in water chemistry, species richness and community composition of aquatic macrophytes in 56 lakes in Denmark around 1990 and again around 2010. Reductions in lake water concentrations of phosphorus and nitrogen were strongest in eutrophic and hypertrophic lakes, for example, lakes which had been heavily affected by domestic sewage. These changes translated into decreased algal biomass in the most eutrophied lakes. Oligo‐ and mesotrophic lakes did not change significantly in terms of nutrients or algal biomass. Water clarity increased across all lakes but not significantly in specific trophic lake groups. Alkalinity and pH increased significantly (up to 2 pH‐units) in low‐alkaline lakes, while well‐buffered high‐alkaline lakes (>0.5 meq/L) did not show any change. Macrophyte species richness per lake increased, on average, by 13% during the 20‐year study period. The increase was strongest in species preferring nutrient‐rich conditions and could be directly attributed to reductions in phytoplankton biomass in lakes of medium water clarity. The similarity among all lakes in terms of species composition increased over the study period. This development was closely related to higher average species richness and was mainly caused by recolonisation of lakes, recovering from past eutrophication, by relatively common species (e.g., Lemna trisulca, Sparganium emersum and Potamogeton berchtoldii). Higher pH in low‐alkaline lakes was accompanied by a shift from acid‐tolerant to more acid‐sensitive species. Our results demonstrate that investment in pollution control has been successful in terms of markedly improving water quality of lakes and, with a time lag, macrophyte species richness. Although relatively common species have spread across lakes and resulted in homogenised macrophyte communities, continued efforts to reduce pollution could ensure the survival of rare specialist species and perhaps even increase their abundance in the future.

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Groundwater–surface water interaction in Denmark

2023

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The study of groundwater–surface water interaction has attracted growing interest among researchers in recent years due to its wide range of implications from the perspectives of water management, ecology and contamination. Many of the studies shed light on conditions on a local scale only, without exploring a regional angle. To provide a broad and historical overview of groundwater–surface water interaction, a review of research carried out in Denmark was undertaken due to the high density of studies conducted in the country. The extent to which this topic has been investigated is related to Denmark's physiography and climate, the presence of numerous streams and lakes combined with shallow groundwater, and historical, funding, and administrative decisions. Study topics comprise groundwater detection techniques, numerical modeling, and contaminant issues including nutrients, ranging from point studies all the way to studies at national scale. The increase in studies in recent decades corresponds with the need to maintain the good status of groundwater‐dependent ecosystems and protect groundwater resources. This review of three decades of research revealed that problems such as the difference in scales between numerical models and field observations, interdisciplinary research integrating hydrological and biological methods, and the effect of local processes in regional systems remain persistent challenges. Technical progress in the use of unmanned aerial vehicles, distributed temperature sensing, and new cost‐effective methods for detecting groundwater discharge as well as the increasing computing capacity of numerical models emerge as opportunities for dealing with complex natural systems that are subject to modifications in future triggered by climate change.This article is categorized under: Science of Water > Hydrological Processes Science of Water > Water and Environmental Change Water and Life > Nature of Freshwater Ecosystems

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Remarkable richness of aquatic macrophytes in 3-years old re-established Lake Fil, Denmark

Cited by 18 publications

References 34 publications

Temporal development of biodiversity of macrophytes in newly established lakes

Temporal development of biodiversity of macrophytes in newly established lakes

Recovery of lake vegetation following reduced eutrophication and acidification

Groundwater–surface water interaction in Denmark

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