Lake enrichment by submersed macrophytes: A Norwegian whole-lake experience with Elodea canadensis

Rørslett, Bjørn; Berge, D.; Johansen, Stein W.

doi:10.1016/0304-3770(86)90030-6

Cited by 64 publications

(35 citation statements)

References 22 publications

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“…Seasonal growth patterns for E. canadensis are highly variable, with late-starting populations seldom reaching full stand size and/or full-strength in situ phytoplankton inhibition (Ozimek and Balcerzak, 1976;Rørslett et al, 1986). Delayed, stunted E. canadensis growth was observed in Østensjøvatn and other nearby locations during the study year, probably because of a long period of low light availability associated with an unusual high spring water level during the study year (authors' personal observation).…”

Section: > Laboratory Experimentsmentioning

confidence: 99%

Seasonal and scale-dependent variability in nutrient- and allelopathy-mediated macrophyte–phytoplankton interactions

Lombardo

Mjelde

Källqvist

et al. 2013

Knowl. Managt. Aquatic Ecosyst.

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Key-words:Ceratophyllum demersum, Elodea canadensis, nutrients, allelopathy, alternate stable states in shallow lakes macrophyte-phytoplankton interactions were investigated using a dual laboratory and field approach during a growing season, with responses quantified as changes in biomass. Short-term, close-range interactions in laboratory microcosms always led to mutual exclusion of macrophytes (Elodea canadensis or Ceratophyllum demersum) and algae (Raphidocelis subcapitata, Fistulifera pelliculosa) or cyanobacteria (Synechococcus leopoliensis), suggesting regulation by positive feedback mechanisms, progressively establishing and reinforcing a "stable state". Laboratory results suggest that close-range regulation of R. subcapitata and F. pelliculosa by macrophytes was primarily via nutrient (N, P) mediation. Sprig-produced allelochemicals may have contributed to inhibition of S. leopoliensis in C. demersum presence, while S. leopoliensis was apparently enhanced by nutrients leaked by subhealthy (discolored leaves; biomass loss) E. canadensis. Seasonal changes in algal growth suppression were correlated with sprig growth. Marginal differences in in situ phytoplankton patterns inside and outside monospecific macrophyte stands suggest that the nutrient-and/or allelopathy-mediated closerange mechanisms observed in the laboratory did not propagate at the macrophyte-stand scale. Factors operating at a larger scale (e.g., lake trophic state, extent of submerged vegetation coverage) appear to override in situ macrophyte-phytoplankton close-range interactions. RÉSUMÉ Variabilité saisonnière et dépendante de l'échelle dans les interactions macrophytephytoplancton liées aux nutriments et à des relations d'allélopathie Mots-clés :Ceratophyllum demersum, Elodea canadensis, Les interactions macrophytes-phytoplancton ont été étudiées à l'aide d'une approche double de laboratoire et de terrain au cours d'une saison de croissance, avec des réponses quantifiées comme les changements dans la biomasse. Les interactions à court terme et à courte portée dans des microcosmes de laboratoire ont toujours conduit à l'exclusion mutuelle entre des macrophytes (Elodea canadensis ou Ceratophyllum demersum) et des algues (Raphidocelis subcapitata,

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Section: > Laboratory Experimentsmentioning

confidence: 99%

Seasonal and scale-dependent variability in nutrient- and allelopathy-mediated macrophyte–phytoplankton interactions

Lombardo

Mjelde

Källqvist

et al. 2013

Knowl. Managt. Aquatic Ecosyst.

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“…Submerged plants and phytoplankton share similar resources essential for growth. Studies indicated that submerged plants could help inhibit the growth of phytoplankton by competing for nutrients or light (Filzgerald, 1969;Boyd, 1971;Phillips et al, 1978;Rørslett et al, 1986;Ozimek et al, 1990;Van Donk et al, 1993;Mjelde and Faafeng, 1997;Lombardo and Cooke, 2003). Submerged plants could also affect phytoplankton biomass through allelopathic effects.…”

Section: Introductionmentioning

confidence: 99%

Submerged vegetation removal promotes shift of dominant phytoplankton functional groups in a eutrophic lake

Dong

Yang

et al. 2014

Journal of Environmental Sciences

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Historical data indicate that the dominance of submerged plants in Dianchi Lake in the 1960s was characterized by low algal density with dominance of non-toxic group J (Scenedesmus, Pediastrum, etc.). The removal of submerged plants, which began in the 1970s, resulted in the expansion of bloom-forming Microcystis (group M). Laboratory experiments suggested that Microcystis aeruginosa was inclined to grow and develop at elevated temperatures. The growth of Scenedesmus obliquus was slower than that of co-cultivated M. aeruginosa in the absence of Ceratophyllum demersum, especially at higher temperatures. The existence of submerged plant C. demersum could inhibit the growth of the harmful algae M. aeruginosa and this inhibitory effect by C. demersum was enhanced with an increase in temperature. Instead, with C. demersum, the growth of S. obliquus was not inhibited, but the co-cultivated M. aeruginosa was eliminated in a short time. Combined with the historical data and laboratory experiments, it was indicated that the submerged plants might play important roles in the dominance of the non-toxic group J in the historical succession. Consequently, the introduction of the submerged plant such as C. demersum might alter the dominant phytoplankton functional groups from M to J and benefit the restoration of the eutrophic lake.

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“…Possibly the reduction in yield from 4.4 to 2.4 tonnes may be explained by pondweed now forming dense stands in approximately 50% of the 0-10 m depth interval (RØRSLETT et al, 1986;SKURDAL and QVENILD, 1989). Areas with dense Elodea stands are apparently completely avoided and the crayfish production in these areas are substantially reduced.…”

Section: Figurementioning

confidence: 99%

Management Strategies, Yield and Population Development of the Noble Crayfish Astacus Astacus in Lake Steinsfjorden

Skurdal¹,

Garnås²,

Taugbøl

2002

Bull. Fr. Pêche Piscic.

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Lake Steinsfjorden is the most important noble crayfish locality in Norway. The crayfish population has been monitored annually since 1979 including data on total trapping effort, yield and population composition before and after the catching season.The harvest has ranged from 0.7-4.7 kg.ha -1 . The catch per trap night decreased prior to 1991 and the yield was reduced by some 50% over the years 1987-1992 as compared to 1979-1986. This was due to removal of small crayfish, high exploitation and the establishment of dense stands of Canadian pondweed (Elodea canadensis).Baited traps catch a large fraction of crayfish < 95 mm total length minimum size. These should according to the regulations immediately be released into the lake. However, it is apparent from the size composition that release of these small crayfish was rather incomplete. In 1983, trap mesh size was increased from 17.5 mm to 21 mm to reduce the fraction of undersized crayfish in the trap catches, yet no effects of this increased mesh size on crayfish size distribution were observed. The legal season has been reduced three times during the study period. In 1983, the closing date was changed from 31 December to 15 September. In 1989 the legal season was further reduced to two weeks and finally in 1995 to 10 days. This reduced total trap effort by 45%. The shorter season allow many crayfish to moult twice instead of once between seasons and the fraction of large crayfish has thus increased and so has the catch per trap night. Canadian pondweed has established dense annual stands and thus has made large parts of the shallow areas unsuitable for crayfish, causing an overall decrease in crayfish population size and production.

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Lake enrichment by submersed macrophytes: A Norwegian whole-lake experience with Elodea canadensis

Cited by 64 publications

References 22 publications

Seasonal and scale-dependent variability in nutrient- and allelopathy-mediated macrophyte–phytoplankton interactions

Seasonal and scale-dependent variability in nutrient- and allelopathy-mediated macrophyte–phytoplankton interactions

Submerged vegetation removal promotes shift of dominant phytoplankton functional groups in a eutrophic lake

Management Strategies, Yield and Population Development of the Noble Crayfish Astacus Astacus in Lake Steinsfjorden

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