Aquatic macrophyte richness in Danish lakes in relation to alkalinity, transparency, and lake area

Vestergaard, Ole; Sand‐Jensen, Kaj

doi:10.1139/cjfas-57-10-2022

Cited by 61 publications

(105 citation statements)

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“…Scientists have found that in terrestrial systems, plant richness varies positively with plant abundance (for example, Loreau et al 2001;Rajaniemi 2003) or quadratically (rising then falling) as biomass increases (Chalcraft et al 2004). In a study of 73 Danish lakes, SAV richness was found to vary positively with size of colonized areas (Vestergaard and Sand-Jensen 2002). However, we found no relationship between richness and SAV biomass.…”

Section: Discussioncontrasting

confidence: 76%

Long‐term changes in abundance and diversity of macrophyte and waterfowl populations in an estuary with exotic macrophytes and improving water quality

Rybicki

Landwehr

2007

Limnology & Oceanography

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We assessed species-specific coverage (km 2 ) of a submerged aquatic vegetation (SAV) community in the fresh and upper oligohaline Potomac Estuary from 1985 to 2001 using a method combining field observations of species-proportional coverage data with congruent remotely sensed coverage and density (percent canopy cover) data. Biomass (estimated by density-weighted coverage) of individual species was calculated. Under improving water quality conditions, exotic SAV species did not displace native SAV; rather, the percent of natives increased over time. While coverage-based diversity did fluctuate and increased, richness-based community turnover rates were not significantly different from zero. SAV diversity was negatively related to nitrogen concentration. Differences in functional traits, such as reproductive potential, between the dominant native and exotic species may explain some interannual patterns in SAV. Biomass of native, as well as exotic, SAV species varied with factors affecting water column light attenuation. We also show a positive response by a higher trophic level, waterfowl, to SAV communities dominated by exotic SAV from 1959 to 2001.

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Section: Discussioncontrasting

confidence: 76%

Long‐term changes in abundance and diversity of macrophyte and waterfowl populations in an estuary with exotic macrophytes and improving water quality

Rybicki

Landwehr

2007

Limnology & Oceanography

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“…Trophic status and the size of a reservoir are important factors that determine its richness and diversity (Murphy et al, 1990;Rørslett, 1991;Vestergaard & Sand-Jensen, 2000;Bornette et al, 2001;Lougheed et al, 2001). The present analysis focuses mainly on the role of the macrophytes commonly growing in water reservoirs and their importance for estimating richness and diversity.…”

Section: Discussionmentioning

confidence: 99%

“…Several abiotic and biotic factors determine the aquatic macrophyte richness of lakes. The former group of factors includes, among others, latitude (Heino & Toivonen, 2008), water chemistry and the trophic state (Murphy et al, 1990;Rørslett, 1991;Vestergaard & Sand-Jensen, 2000;Bornette et al, 2001), water level fluctuation (Van Geest et al, 2005;Holm & Clausen, 2006;Maltchik et al, 2007) and the lake area and morphometry (Rørslett, 1991;Gasith & Hoyer, 1998;Vestergaard & Sand-Jensen, 2000;Murphy, 2002;Thomaz et al, 2003). Among the biotic factors, significant effect on the richness of plant species is exerted by dominant freshwater aquatic and wetland plant species (Gopal & Goel, 1993;Gough et al, 1994;Grace & Wetzel, 1998;Ervin & Wetzel, 2002).…”

Section: Introductionmentioning

confidence: 99%

The influence of Ceratophyllum demersum L. and Stratiotes aloides L. on richness and diversity of aquatic vegetation in the lakes of mid-eastern Poland

et al. 2010

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The aim of this study was to estimate the influence of Ceratophyllum demersum L. and Stratiotes aloides L. on the species richness and phytocoenotic diversity of aquatic vegetation in lakes. The study was based on field investigations in the Łęczna-Włodawa Lake District located in mid-eastern Poland. The studied lakes (32) included both polymictic and dimictic reservoirs. Both in the polymictic and dimictic lakes, statistically significant correlation coefficients were obtained between the parameters that characterize Stratiotes aloides (the frequency in the phytosociological relevés, the percent share of Stratiotetum aloidis association in the phytolittoral) and those characteristic for species richness (the total number of hydromacrophytes, the number of charophytes, elodeids, nymphaeids and lemnids), phytocoenotic richness (the mean number of species in the phytosociological relevés) and phytocoenotic diversity (the Shannon-Wiener Index). The communities with a share of S. aloides are characterized by higher species richness. However, not a single case of statistically significant dependency was reported between the parameters that describe C. demersum (the frequency in the phytosociological relevés, the percent share Ceratophylletum demersi association in the phytolittoral) and the vegetation traits in both lake groups. Common occurrence of Stratiotes aloides might be considered to be evidence for good status of an aquatic ecosystem and a very good indicator of species richness and diversity of aquatic vegetation.

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“…Although we were not able to employ any statistical analysis to compare both species in view of the differences in the experiments duration (see reasons in Methods), these results indicate that E. najas would be a more successful species in habitats with low alkalinity, at E. najas and E. densa) increase the photosynthetic rates with increasing alkalinity. Thus, differently from free-floating and emergent species, which depend more on phosphorus and nitrogen for growth (Henry-Silva et al, 2008), alkalinity has been considered as an important variable explaining patterns of occurrence of submersed species (Vestergaard and Sand-Jensen, 2000). These results may be partially explained by the ability these plants have to assimilate bicarbonate, which represents an alternative source of inorganic carbon (Sand-Jansen and Gordon, 1986).…”

Section: Resultsmentioning

confidence: 99%

Inorganic carbon shortage may limit the development of submersed macrophytes in habitats of the Paraná River basin

Freitas¹,

Thomaz²

2011

Acta

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Aim: In this investigation we carried out an experiment to assess whether the growth of Egeria najas and E. densa (two rooted submersed Hydrocharitacea, native to South America) are limited by inorganic carbon or not; Methods: We measured the early plant growth in 3 L microcosms with alkalinities of 100 µM.L -1 and 500 µM.L -1 . These alkalinites represent extremes which are typical of most waters in the Upper Paraná River basin and they represent low and high inorganic carbon (mainly bicarbonate) availabilities, respectively; Results: The elongation of E. densa, and the relative growth rates and root development of both species were significantly higher when they grew in the high alkalinity treatment; Conclusions: Our results strongly suggest that in several habitats and during certain periods of the year, inorganic carbon shortage may limit the growth of both species. In this sense, phosphorus and nitrogen may assume a secondary role as controlling factors of these plants, because they assimilate these nutrients from sediment, where they are usually found in high concentrations. Thus, controlling eutrofication as a strategy to reduce their biomass may not be successful.Keywords: eutrophication, reservoirs, Egeria, bicarbonate, aquatic plants. Resumo: Objetivos:Nesse trabalho nós realizamos um experimento para avaliar se o crescimento de Egeria najas e E. densa (duas espécies de macrófitas aquáticas submersas da família Hydrocharitaceae, nativas da América do Sul) é limitado por carbono inorgânico; Métodos: Nós medimos os estágios iniciais de crescimento de fragmentos em microcosmos de 3 L com alcalinidade de 100 µM.L -1 e 500 µM.L -1 . Esses valores de alcalinidade foram escolhidos por representarem extremos típicos da maioria dos ecossistemas aquáticos da bacia do Alto rio Paraná e representaram baixa e alta disponibilidade de carbono (principalmente bicarbonato), respectivamente; Resultados: O alongamento de E. densa e o crescimento relativo e desenvolvimento de raízes de ambas as espécies foram significativamente maiores quando os fragmentos cresceram no tratamento de alta alcalinidade; Conclusões: Esses resultados indicam que em vários habitats da bacia do rio Paraná e durante certos períodos do ano, baixas concentrações de carbono inorgânico podem limitar o crescimento de ambas as espécies. Dessa forma, o fósforo e o nitrogênio podem assumir um papel secundário como fatores controladores do estabelecimento e crescimento dessas plantas, porque elas assimilam esses nutrientes do sedimento, onde os mesmos são encontrados em elevadas concentrações. Assim, somente o controle da eutrofização como uma estratégia para reduzir a biomassa dessas espécies pode não alcançar sucesso.Palavras-chave: eutrofização, reservatórios, Egeria, bicarbonato, plantas aquáticas. Biological Limnology 58Freitas, A. and Thomaz, SM. Acta Limnologica BrasiliensiaPositive influence of alkalinity on the occurrences of E. najas and E. densa were first suggested in the Paraná River basin in an investigation carried out in several...

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Aquatic macrophyte richness in Danish lakes in relation to alkalinity, transparency, and lake area

Cited by 61 publications

References 0 publications

Long‐term changes in abundance and diversity of macrophyte and waterfowl populations in an estuary with exotic macrophytes and improving water quality

Long‐term changes in abundance and diversity of macrophyte and waterfowl populations in an estuary with exotic macrophytes and improving water quality

The influence of Ceratophyllum demersum L. and Stratiotes aloides L. on richness and diversity of aquatic vegetation in the lakes of mid-eastern Poland

Inorganic carbon shortage may limit the development of submersed macrophytes in habitats of the Paraná River basin

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