Zur Frage: Führt der Donaustrom autochthones Plankton?

Wawrik, Friederike

doi:10.1127/agdonauforschung/1/1962/28

Cited by 5 publications

(4 citation statements)

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“…That is to say, it is evidently not necessary to impose the condition of limnetic reservoirs in the catchment of a given river for the introduction of a true plankton. The analysis of the development of populations in the River Meuse (France/Belgium) presented by Descy & Gosselain (1994, this volume), as well as the observations of Kbhler (1994;this volume), that typically fluvial species of centric diatom or chlorococcal green alga develop within the interconnecting river channels provides corroborative evidence that the interpretation is correct (see Descy, 1987) and supports previous suggestions that the species which build up their population levels in rivers do often arise within the rivers themselves (Wawrik, 1962;Reynolds & Glaister, 1993).…”

Section: Rivers -Retaining the Inoculumsupporting

confidence: 71%

Are phytoplankton dynamics in rivers so different from those in shallow lakes?

Reynolds¹,

1994

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This paper introduces a series of contributions to the ninth meeting of the International Association of Phytoplankton Taxonomy and Ecology, held in Belgium during July, 1993. It draws from the original papers a synthesis which supports the view that the successful species in rivers and turbid shallow lakes are selected primarily on their ability to survive high-frequency irradiance fluctuations as they are circulated through steep light gradients. The selective distinction is less than that which discriminates between plankton of deep lakes and shallow lakes or even between clear and turbid shallow ones. River plankton is, however, dependent on fast growth rates but its survival in rivers is aided by a suite of water-retentive mechanisms. The ecology of turbid systems is dominated by physical interactions, those biotic interactions traditionally believed to regulate limnetic communities being suppressed and rarely well-expressed.

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Section: Rivers -Retaining the Inoculumsupporting

confidence: 71%

Are phytoplankton dynamics in rivers so different from those in shallow lakes?

Reynolds¹,

1994

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“…Compared to limnetic phytoplankton, few genera of algae achieve dominance, or even become abundant, within rivers. If resuspended benthic forms and those limnoplanktonic forms clearly gleaned from tributary lakes are excluded, the commoner genera cited in the numerous case studies (classics include those of Zacharias, 1898;Fritsch, 1902;Kofoid, 1903;Butcher, 1924;Margalef, 1960; notable subsequent examples include those of Liepolt, 1961;Wawrik, 1962;Greenberg, 1964;Swale, 1969;Lack, 1971;Williams, 1972;Holmes & Whitton, 1981;Jones & Barrington, 1985;Descy, 1987;Sabater & Mufioz, 1990;Khler, 1993) are conspicuously few: centric diatoms, including Cyclotella and Stephanodiscus; pennate diatoms, including Navicula, Nitzschia and Synedra; green algae of the order Chlorococcales (e.g. Ankistrodesmus, Chlorella, Crucigenia, Dactylococcus, Golenkinia, Pediastrum, Scenedesmus and Tetraddron); Cryptomonads; occasionally, filamentous cyanobacteria (Oscillatoria, Pseudanabaena), more rarely, colonial Aphanizomenon or Microcystis (see especially Sabater & Mufioz, 1990;Kbhler, 1993).…”

Section: Plankton Selection In Riversmentioning

confidence: 99%

The long, the short and the stalled: on the attributes of phytoplankton selected by physical mixing in lakes and rivers

Reynolds

1994

Hydrobiologia

172

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Paradoxically, although turbulence characterises the open water environments of planktonic organisms in lakes, rivers and seas, most species of phytoplankton are smaller than the size of the smallest eddies dissipating the energy and, so, must function in an immediate medium which is inherently viscous. Intensively mixed systems, such as wind-stirred shallow lakes, rivers and estuaries, however, constantly readjust the vertical position of suspended algae and, often, other non-living, light-absorbing particles with the effect that the light field to which the algae are subject is erratic and the received day-time light dose is aggregately depressed: cells need to photoadapt accordingly. In fluvial environments the additional constraint of rapid, horizontal, supposedly unidirectional, transport is applied, requiring the attribute of rapid processing of primary products and cell replication. Significant downstream recruitment, however, is benefitted by the presence of so-called 'dead-zones' which retain water (and suspended plankton) sufficiently to accommodate additional cell divisions.

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“…Naidenow, 1966Naidenow, , 1984. The origin of the Danubian phytoplankton was extensively discussed by Wawrik (1962). It is autochthonous in her opinion.…”

Section: Introductionmentioning

confidence: 99%

Shallows of the lower Danube as additional sources of potamoplankton

Stoyneva

1994

Hydrobiologia

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This paper presents studies on the algal flora of the Bulgarian Danube section during three summer periods (1980)(1981)(1982) and during the four seasons of 1987/1988. The following variables were investigated: 1) species composition of the river phytoplankton and the phytobenthos; 2) frequency quotients of the species; 3) number of species at the investigated sites; 4) phytoplankton numbers and biomass; 5) floristic similarity between the sites. The data show the existence of a dynamic connection between phytoplankton and phytobenthos. The shallows in the midstream and river arms play an important role as potamoplankton sources during the periods of low waters. It is comparable with the role of the adjacent wetlands to which previously priority was given. This is especially so below 597th river kilometer.

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Zur Frage: Führt der Donaustrom autochthones Plankton?

Cited by 5 publications

References 0 publications

Are phytoplankton dynamics in rivers so different from those in shallow lakes?

Are phytoplankton dynamics in rivers so different from those in shallow lakes?

The long, the short and the stalled: on the attributes of phytoplankton selected by physical mixing in lakes and rivers

Shallows of the lower Danube as additional sources of potamoplankton

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