Spatial patterns in aquatic vegetation composition and environmental covariates along chains of lakes in the Kokemäenjoki watershed (S. Finland)

Mäkelä, Suvi; Huitu, Eeva; Арвола, Лаури

doi:10.1016/j.aquabot.2004.08.006

Cited by 48 publications

(30 citation statements)

References 17 publications

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“…Their area is 245 km 2 (mean 6 standard deviation 0.40 6 3.03, median 0.008 km 2 ), which is 15% of the landscape area (Statistics of Finnish Environment Institute; Bergströ m et al 2007). The chemical properties of the 12 study lakes (Table 2) correspond well to those in the whole study region (Mä kelä et al 2004, Finnish Environment Institute, OIVA service on environmental and geographic information). The pelagic fluxes for lake size classes , 0.01, 0.01-0.1, 0.1-1, 1-10, and 10-50 km 2 were estimated by multiplying the area of the size class by the mean annual flux of CO 2 and CH 4 in the respective size class.…”

Section: Lakementioning

confidence: 55%

Lake‐size dependent physical forcing drives carbon dioxide and methane effluxes from lakes in a boreal landscape

Kankaala

Huotari

Tulonen

et al. 2013

Limnology & Oceanography

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We studied the concentrations and diffusive fluxes of carbon dioxide (CO 2 ) and methane (CH 4 ) in 12 lakes in a size range of 0.004-35 km 2 and mean total organic carbon (TOC) range of 6-25 mg L 21 , located in the southern boreal area of Finland. TOC, mainly originating from the catchment, was the best predictor of concentrations and areal CO 2 effluxes in the whole lake-area range, but among the lakes with an area , 1 km 2 having an anoxic hypolimnion during summer, the areal effluxes were also related to lake size and an index of turbulence. The concentration and areal effluxes of CH 4 from the lakes' pelagic zones were related more closely to lake-sizerelated water column stability and turbulent mixing than directly to TOC. The total regional flux estimate from 619 lakes in the region of 1600 km 2 showed that seven lakes with an area of 10-50 km 2 were responsible for 57-69% of the pelagic CO 2 effluxes and about half of the sum of pelagic and littoral CH 4 effluxes from the lakes. The proportion accounted for by the small lakes (area , 1 km 2 ) in the gas effluxes was 1.4-2.1 times higher, 18-26% for CO 2 and 21-26% for CH 4 , than their areal proportion (12.5%) in the landscape, although numerically these small lakes predominate in the whole lake population (96%).Most inland waters worldwide have been shown to be supersaturated with the greenhouse gases (GHG) carbon dioxide (CO 2 ) and methane (CH 4 ), and thus release these gases to the atmosphere (Cole et al. 1994;Bastviken et al. 2004). The GHG supersaturation indicates that freshwater ecosystems play an important role in the global carbon cycle by mineralizing and/or accumulating terrestrial organic carbon (Tranvik et al. 2009). By applying Pareto distribution analysis, Downing et al. (2006) estimated that . 99% of the world's lakes have an area , 1 km 2 and these small lakes form , 43% of the global lake area. Thus, in many recent analyses of lake-rich landscapes, the role of small lakes has received much attention, because the small headwater lakes are more typically characterized by higher concentrations of allochthonous organic carbon than the larger lowland lakes (Xenopoulos et al. 2003;Hanson et al. 2007;Einola et al. 2011). In the boreal region, high fluxes of total organic carbon (TOC), originating mainly from peatland and forested catchments (Kortelainen 1993;Humborg et al. 2010), are among the most important factors contributing to CO 2 supersaturation and oxygen consumption in the lake water columns and sediments (Salonen et al. 1983;Larsen et al. 2011). As a result of anaerobic decomposition of organic matter, high concentrations of CH 4 are typical in eutrophic lakes with an anoxic hypolimnion but also in sheltered forest lakes, which likewise develop marked and prolonged hypolimnetic anoxia. It has been suggested that spring and fall mixing periods are generally the periods of the greatest effluxes of GHG into the atmosphere. However, rainy periods may also be followed by efflux peaks , and thus precipitation influences the inte...

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Section: Lakementioning

confidence: 55%

Lake‐size dependent physical forcing drives carbon dioxide and methane effluxes from lakes in a boreal landscape

Kankaala

Huotari

Tulonen

et al. 2013

Limnology & Oceanography

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“…The specific character of the substrates (mostly organic and frequently peat bottoms) inhabited massively by this species was also emphasized [8,9,11,23,25]. Moreover the findings of some authors [9,26] showed that the phytocoenoses formed by N. pumila were ecologically distinct from those of N. lutea and N. candida. The results of this study demonstrated the distinct character of each of the habitats of N. pumila and H. verticillata.…”

Section: Discussionmentioning

confidence: 99%

Ecology of rare water plant communities in lakes of north-eastern Poland

Jabłońska

Kłosowski

2012

Acta Soc Bot Pol

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. Their values were lower in waters of the H. verticillata phytocoenoses. The habitats of all the three types of rare phytocoenoses differed considerably from those of N. lutea. The most significant differences were found between the N. lutea and N. pumila phytocoenoses and the smallest differences were between the patches of N. lutea and N. candida. The properties of water were more important in differentiating the habitats of the phytocoenoses studied than the substrate properties. Due to alkalization and increase in water hardness in the lakes studied the stands of N. pumila are among the most threatened. The patches of N. candida and H. verticillata, which occur in waters with a wider range of hardness and tolerating a slight increase in trophy, can still continue to persist in the lakes for a long time.

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“…Many studies have correlated the distribution of different aquatic macrophytes with water chemistry in lakes (Spence 1967, James et al 2005) and running waters (Whitton 1979, Schneider & Melzer 2003. Several limnological parameters were found to be responsible for the distribution pattern of hydrophytes, such as pH (Palmer et al 1992), alkalinity (Vestergaard & SandJensen 2000), conductivity (Mäkelä et al 2004) and nutrients (Heegard et al 2001) but most observations have been restricted to temperate regions during the peak growth period of aquatic vegetation.…”

Section: Introductionmentioning

confidence: 99%

Presence of tropical hydrophytes in relation to limnological parameters - a study of two freshwater ponds in Kolkata, India

Mukhopadhyay

Dewanji

2005

Ann. Limnol. - Int. J. Lim.

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The presence of different species of hydrophytes was investigated in relation to Secchi disk visibility, pH, dissolved oxygen, electrical conductivity, total Kjeldahl nitrogen, total phosphorus and chlorophyll-a concentration in two tropical ponds nearby Kolkata, India, during a three years period (June 1999 to May 2002. The dominant flora in the ponds namely, Alternanthera philoxeroides, Nymphoides hydrophylla, Lemna aequinoctialis, and Vallisneria spiralis were found to subsist over a wide amplitude of nutrient levels thereby showing their adaptability to highly eutrophic ecosystems, a common feature of the tropics. However, the presence of some minor species could be associated with a narrow range of specific limnological variables.

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Spatial patterns in aquatic vegetation composition and environmental covariates along chains of lakes in the Kokemäenjoki watershed (S. Finland)

Cited by 48 publications

References 17 publications

Lake‐size dependent physical forcing drives carbon dioxide and methane effluxes from lakes in a boreal landscape

Lake‐size dependent physical forcing drives carbon dioxide and methane effluxes from lakes in a boreal landscape

Ecology of rare water plant communities in lakes of north-eastern Poland

Presence of tropical hydrophytes in relation to limnological parameters - a study of two freshwater ponds in Kolkata, India

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