Interactions between environmental factors and vertical extension of helophyte zones in lakes in Finland

Schweizerische Zeitschrift für Hydrologie - 2018
A. Keto1, J. Aroviita2, S. Hellsten2
1Ministry of the Environment, Helsinki, Finland
2Finnish Environment Institute, Freshwater Centre, Oulu, Finland

Tóm tắt

Sheltered shores in boreal lakes are typically dominated by emergent helophytes in which the perennating organ lies in soil below the water level, but the aerial shoots protrude above the water. Changes in natural water-level regimes due to hydropower development may significantly affect the longitudinal extent of the helophyte zone. We explored the vertical distribution of helophyte zones under water-level regulation to develop tools for estimating hydropower impacts. We recorded the vertical extension of the three most common helophyte species (Carex L. spp., Equisetum fluviatile L., and Phragmites australis (Cav.) Trin. ex Steud.) along 238 macrophyte transects in four regulated lakes and one nonregulated lake in Finland. We used random forest (RF) models to quantify the degree to which water-level fluctuation and site-specific environmental variables uniquely explained the variation in helophyte zonation. The vertical extension of Carex spp. was most strongly associated with the water-level fluctuation of the open-water period (OWP), followed by Phragmites and Equisetum. Overall, the RF models explained 4–41% of the variation observed in the helophyte zones. The models indicated that OWP fluctuation, slope, openness, and cover of other macrophyte groups were key factors explaining the extent of the helophyte zones. OWP fluctuation was the most important variable for zonation of Carex spp. and the upper limit of Phragmites. Slope was the most significant variable for the lower limit of Equisetum and Phragmites. Our study demonstrates the importance of taking into account natural habitat-level variability to increase confidence in quantifying the environmental impacts of hydropower production. This approach could be used in future impact assessments of new water-level regulation practices.

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Tài liệu tham khảo

Alahuhta J, Hellsten S, Kuoppala M, Riihimäki J (2018) Regional and local determinants of macrophyte community compositions in high-latitude lakes of Finland. Hydrobiologia 812:99

Anhua W, Chow-Fraser P (2006) Synergistic impact of water level fluctuation and invasion of Glyceria on Typha in a freshwater marsh of Lake Ontario. Aquat Bot 84:63–69

Barko JW, Smart RM (1983) Effects of organic matter additions to sediment on the growth of aquatic plants. J Ecol 71:161–175

Blom CWPM, Voesenek LACJ (1996) Flooding: the survival strategies of plants. Trends Ecol Evol 11.7:290–295

Breiman L (2001) Random forests. Mach Learn 45(1):5–32

Coops H, van der Velde G (1995) Seed dispersal, germination, and seedling growth of six helophyte species in relation to water-level zonation. Freshw Biol 34:13–20

Coops H, Geilen N, van der Velde G (1994) Distribution and growth of the helophyte species Phragmites australis and Scirpus lacustris in water depth gradients in relation to wave exposure. Aquat Bot 48:273–284

Coops H, Brink FWB, van der Velde G (1996) Growth and morphological responses of four helophyte species in an experimental water-depth gradient. Aquat Bot 54:11–24

Cutler DR, Edwards TC, Beard KH, Cutler A, Hess KT, Gibson J, Lawler JJ (2007) Random forests for classification in ecology. Ecology 88(11):2783–2792

De’ath G (2007) Boosted trees for ecological modeling and prediction. Ecology 88:243–251

Duarte CM, Kalff J (1986) Littoral slope as a predictor of the maximum biomass of submerged macrophyte communities. Limnol Oceanogr 31:1072–1080

Elveland J (1984) Degeneration of wet hay-meadow vegetation caused by inundation at the stubble. Svensk Botanisk Tidskrift 78:45–58

European Environment Agency (2012) European waters—assessment of status and pressures. EEA Report No 8/2012

European Union (2009) Directive 2009/28/EC of the European Parliament and of the Council on the Promotion of the Use of Energy from Renewable Sources and Amending and Subsequently Repealing Directives 2001/77/EC and 2003/30/EC. Official Journal of the European Union, L140/16

Evtimova VV, Donohue I (2016) Water-level fluctuations regulate the structure and functioning of natural lakes. Freshw Biol 61(2):251–264

Feldmann T (2012) The structuring role of lake conditions for aquatic macrophytes. A thesis for applying for the degree of Doctor of Philosophy in Hydrobiology. Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences

Gao X, Da-Bing G, Zheng-Miao D, Yong-Hong X, Tie-Jun G (2015) Survival strategy in the wetland Sedge Carex brevicuspis (Cyperaceae) in response to flood and drought: avoidance or tolerance? Annales Botanici Fennici 52:401–410

Genuer R, Poggi JM, Tuleau-Malot C (2015) VSURF: an R package for variable selection using random forests. R J 7(2):19–33

Hastie T, Tibshirani R, Friedman J (2001) The elements of statistical learning New York. Springer, New York, pp 115–163

Hellsten S (1997) Environmental factors related to water level regulation—a comparative study in northern Finland. Boreal Environ Res 2:345–368

Hellsten S (2000) Environmental factors and aquatic macrophytes in the littoral zone of regulated lakes, causes, consequences and possibilities to alleviate harmful effects. Dissertation thesis. Acta Universitatis Ouluensis vol A 348, pp 125

Hellsten S (2001) Effects of lake water level regulation on aquatic macrophytes stands and options to predict these impacts under different conditions. Acta Botanica Fennica 171:47 p

Hellsten S, Marttunen M, Visuri M, Keto A, Partanen S, Järvinen EA (2002) Indicators of sustainable water level regulation in Northern River Basins: a case study from the River Paatsjoki water system in Northern Lapland. Archiv für Hydrobiologie Supplements 141(3–4):353–370

Hellsten S, Keto A, Suoraniemi M, Partanen S (2006) Long term changes in the aquatic vegetation of Lake Päijänne, Southern Finland. Verhandlungen des Internationalen Verein Limnologie 29:1167–1173

Keddy PA (1983) Shoreline vegetation in Axe Lake, Ontario: effects of exposure on zonation patterns. Ecology 64:331–344

Keto A, Tarvainen A, Hellsten S, Marttunen M (2008) Use of the water level fluctuation analysis tool (Regcel) in hydrological status assessment of Finnish lakes. Hydrobiologia 613:133–142

Marttunen M, Hellsten S, Keto A (2001) Sustainable development of lake regulation in Finnish lakes. Vatten 57:29–37

Marttunen M, Hellsten S, Glover B, Tarvainen A, Klintwall L, Olsson H, Pedersen T-S (2006) Heavily regulated lakes and the European Water Framework Directive—comparisons from Finland, Norway, Sweden, Scotland and Austria. E-Water. Official Publication of the European Water Association (EWA), Hennef

Nilsson SG, Nilsson IN (1978) Species richness and dispersal of vascular plants to islands in Lake Mockeln, southern Sweden. Ecology 59(3):473–480

Nykänen M (1998) Oulujärven rantakasvillisuuden dynamiikka kaudella 1980–1995 ja siihen vaikuttavista tekijöistä. Unpublished Phil Lic Thesis, University of Oulu, Department of Biology

Palomäki R (1993) Response by macrozoobenthos biomass to water level regulation in some Finnish lake littoral zones. Hydrobiologia 286:17–26

Partanen S (2007) Recent spatiotemporal changes and main determinants of aquatic macrophyte vegetation in large lakes in Finland. Acta Universitatis Ouluensis vol A 495, pp 22–26

Partanen S, Hellsten S (2005) Changes of emergent aquatic macrophyte cover in seven large boreal lakes in Finland with special reference to water level regulation. Fennia Int J Geogr 183(1):57–79

Partanen S, Luoto M (2006) Environmental determinants of littoral paludification in boreal lakes. Limnologica 36:98–109

Partanen S, Keto A, Visuri M, Tarvainen A, Riihimaki J, Hellsten S (2006) The relationship between water level fluctuation and distribution of emergent aquatic macrophytes in large, mildly regulated lakes in the Finnish Lake district. Proc Int Assoc Theor Appl Limnol 29(3):1160

Pearsall WH (1920) The aquatic vegetation of the English lakes. J Ecol 8:163–201

Pietiläinen O-P, Räike A (1999) Typpi ja fosfori Suomen sisävesien minimiravinteina. Suomen Ympäristö 313:64

Riis T, Hawes I (2003) Effect of wave exposure on vegetation abundance, richness and depth distribution of shallow water plants in a New Zealand lake. Freshw Biol 48:75–87

Rintanen T (1996) Changes in the flora and vegetation of 113 Finnish lakes during 40 years. Annales Botanici Fennici 33:101–122

Rørslett B (1989) An integrated approach to hydropower impact assessment. II. Submerged macrophytes in some Norwegian hydro-electric lakes. Hydrobiologia 175:65–82

Rørslett B (1991) Principal determinants of aquatic macrophyte richness in northern European lakes. Aquat Bot 39:173–193

Segal S (1971) Principles on structure, zonation and succession of aquatic macrophytes. Hydrobiologia 12:89–95

Sjöberg K, Danell K (1983) Effects of permanent flooding on Carex-Equisetum wetlands in northern Sweden. Aquat Bot 15(3):275–286

Spence DHN (1982) The zonation of freshwater plants. Adv Ecol Res 12:37–125

Sutela T, Aroviita J, Keto A (2013) Assessing ecological status of regulated lakes with littoral macrophyte, macroinvertebrate and fish assemblages. Ecol Ind 24:185–192

Toivonen H, Nybom C (1989) Aquatic vegetation and its recent succession in the waterfowl wetland Koijärvi. S. Finland. Annales Botanici Fennici 26:1–14

Van den Brink FWB, Van der Velde G, Bosman WW, Coops H (1995) Effects of substrate parameters on growth responses of eight helophyte species in relation to flooding. Aquat Bot 50(1):79–97

Wantzen KM, Rothhaupt K-O, Mortl M, Cantonati M, Tóth LG, Fischer P (eds) (2008) Ecological effects of water-level fluctuations in lakes. Developments in hydrobiology, 204. Springer, Netherlands (Hydrobiologia vol 613)

Weisner SEB (1987) The relation between wave exposure and distribution of emergent vegetation in a eutrophic lake. Freshw Biol 18:537–544

Weisner SEB (1991) Within-lake patterns in depth penetration of emergent vegetation. Freshw Biol 26:133–142

Welling CH, Pederson RL, Van der Valk AG (1988) Recruitment from the seed bank and the development of zonation of emergent vegetation during a drawdown in a prairie wetland. J Ecol 76:483–496

Wilcox DA, Meeker JE (1991) Disturbance effects on aquatic vegetation in regulated lakes in northern Minnesota. Can J Bot 69:1542–1551

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