Productivity, Growth and Photosynthesis of Two Small `Isoetid' Plants, Littorella Uniflora and Isoetes Macrospora

Boston, Harry L.; Adams, Michael S.

doi:10.2307/2260422

Cited by 72 publications

(39 citation statements)

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“…The most profound changes concerned the L. uniflora. This species is typically found in uncontaminated soft-water lakes characterized by low carbon concentrations (Boston and Adams, 1987;Pedersen et al, 2006). Trophic changes can lead to its partial or complete disappearance.…”

Section: Discussionmentioning

confidence: 99%

Changes in physico-chemical conditions and macrophyte abundance in a shallow soft-water lake mediated by a Great Cormorant roosting colony

2014

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Section: Discussionmentioning

confidence: 99%

Changes in physico-chemical conditions and macrophyte abundance in a shallow soft-water lake mediated by a Great Cormorant roosting colony

2014

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“…1). These changes are accompanied by a slower growth rate and individuals development (Szmeja 1994a), which may be a stress reaction to the deficiency of nutrients (Boston and Adams 1987;Nielsen and Sand-Jensen 1991;Paffen and Roelofs 1991). On the other hand, Lobelia is well adapted to habitats at high risk of destruction.…”

Section: Discussionmentioning

confidence: 99%

The disintegration of populations of underwater plants in soft water lakes enriched with acidic organic matter

Szmeja

Bociąg

2011

Acta Soc Bot Pol

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The characteristics of habitats, individuals and populations of four submerged macrophytes, Lobelia dortmanna L., Isoëtes lacustris L., Sphagnum denticulatum Brid. and Fontinalis antipyretica Hedw., were studied in 12 soft water oligohumic lakes which had no inflow of allochtonic DOM and the DOC concentration in the water was <4.0 mg C dm -3 and 13 humic lakes enriched with allochthonous dissolved organic matter (DOM) from drained peat bogs and ranging in DOC water concentration from 4.1 to 44.0 mg C dm -3 . The analyses of population disintegration were conducted basing on characteristics of individuals (size, habitat, fertility) and populations (aggregation density index, settlement index of the population area). The settlement index of the population area for Lobelia, Fontinalis, Isoëtes, Sphagnum decreased from 8.4 to 6.2 g d.w. m -2 , 4.6 to 0.01 g d.w. m -2 , 85.4 to <0.001 g d.w. m -2 and 39.3 to 7.2 g d.w. m -2 , respectively. Similar trends were observed in aggregation density. The general pattern of the disintegration of populations of these species was always similar. It was independent of the source macrophytes drew resources from or their susceptibility to environmental changes. Individuals began to be eliminated from the deep and central parts of the population area. The remainder of the populations, which persist in the shallowest, best-illuminated part of the area, are themselves endangered by disturbances caused by wavy motion. The only populations of submerged macrophytes which can survive in polyhumic lakes under such conditions are those which are resistant to disturbances common in the shallow littoral (Lobelia dortmanna, Fontinalis antipyretica).KEY WORDS: soft water lakes, macrophytes, DOM, disturbance, population structure, Isoëtes lacustris, Lobelia dortmanna, Sphagnum denticulatum, Fontinalis antipyretica.pes of ecosystems (Faliñski and Venanzoni 1991; Gillet and Gallandt 1996). However, in no other ecosystem is the vegetation structure as simple or has as few species as aquatic ecosystems do. The main element of this structure are dominant aggregations. They have their own rhythm of variations in abundance and density (Szmeja 1994a, b). As such, they are not only structural, but also functional vegetation units. Therefore, the aggregation density and the settlement index of the population area are useful characteristics in the study of the mechanisms of the disintegration of underwater plants populations that are under anthropogenic pressure.It was presumed that since the dominant macrophytes in soft water lakes have diverse plasticity reaction patterns and life strategies, in the sense that Grime proposed (1979), the extinction of species will vary in lakes supplied with DOM. It is hypothesized that the intensity of population collapse in lakes enriched with allochthonous acidic DOM depends on the degree of habitat transformation, the location in the littoral of the population area and life strategy of the species. It was also the intention of this paper to determine whether ...

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“…Quillwort has evolved various adaptations to particular habitats (e.g. Keeley and Busch 1984;Boston and Adams 1987). It does not tolerate competition; this tolerance is not necessary in the particular lakes in which other, competitive plant species cannot thrive.…”

Section: Discussionmentioning

confidence: 99%

Monitoring the Vitality of Isoëtes Lacustris by Using a Non-Destructive Method

Vöge¹

2015

Limnological Review

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Abstract:The aim of ongoing studies was to expand the non-destructive monitoring of Isoëtes lacustris (Vöge 2004) resulting in a description of the vitality and structure of the population. The influence of the environment on the development of the plant was the subject of extended studies carried out between 1995 and 2014 in more than 100 lakes throughout Europe. The environment was characterized through conductivity, pH and Secchi depth of the lake water and the accompanying submersed plant species, as well as the plant performance through the mean number of leaves of 20 sporogenous plants. The counting of the leaves was performed whilst diving. The vitality level was defined based on Vöge (2004) and related to the environmental conditions; these are referred to in the context. The inventory of the accompanying plant species may reflect a changing environment. The method is demonstrated through case examples. A highly significant correlation between the mean and the smallest number of leaves of sporogenous plants enables separating juvenile from adult plants. Finally, recent results show a relationship between the vitality level and the structure of the population.

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Productivity, Growth and Photosynthesis of Two Small `Isoetid' Plants, Littorella Uniflora and Isoetes Macrospora

Cited by 72 publications

References 59 publications

Changes in physico-chemical conditions and macrophyte abundance in a shallow soft-water lake mediated by a Great Cormorant roosting colony

Changes in physico-chemical conditions and macrophyte abundance in a shallow soft-water lake mediated by a Great Cormorant roosting colony

The disintegration of populations of underwater plants in soft water lakes enriched with acidic organic matter

Monitoring the Vitality of Isoëtes Lacustris by Using a Non-Destructive Method

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