Charisma: a spatial explicit simulation model of submerged macrophytes

An individual-based spatially explicit model ('Charisma') designed to simulate the growth of one or more competing species of submerged macrophytes is presented An important problem in lake management is the replacement of submerged plant species by competing species with undesirable properties. Although dynamics of rooted aquatic macrophytes have been extensively modeled, competition between different species has hardly been addressed so far. We present an individual-based spatially explicit model ('Charisma') designed to simulate the growth of one or more competing species of submerged macrophytes. The model behavior easily becomes rather complex and puzzling if we study more than one species. This probably reflects the complexity as it really occurs in nature, but poses a challenge for calibrating and understanding the model. To control this complexity, we used a flexible design facilitating the elimination of feedback loops and processes to trace the causes of the complex behavior of the model. The resulting realistic, yet transparent' model appeared useful in many aspects for bridging the existing gap between theory and reality. As an example, we present an analysis of competition between the charophyte Chura aspera Deth. ex Willd. and pondweed Potamogeton pectinatus L. The model suggests that alternative equilibria may arise as a result of two positive feedbacks: the enhancement of transparency by macrophytes and a feedback caused by bicarbonate competition. (C) 2002 Elsevier Science B.V, All rights reserved.

[1]  A preliminary model for growth of Ceratophyllum demersum L. , 1981 .

[2]  M. J. M. Hootsmans,et al.  A growth analysis model for Potamogeton pectinatus L. , 1994 .

[3]  Marten Scheffer,et al.  MEGAPLANT: a simulation model of the dynamics of submerged plants , 1993 .

[4]  O. Klepper,et al.  A model of carbon flows in relation to macrobenthic food supply in the Oosterschelde estuary (S.W. Netherlands) , 1989 .

[5]  P. Duarte,et al.  Modelling growth of Ruppia cirrhosa , 2000 .

[6]  T. V. Madsen,et al.  Growth limitation of submerged aquatic macrophytes by inorganic carbon , 1995 .

[7]  Martin Søndergaard,et al.  Impact of submerged macrophytes on phytoplankton in shallow freshwater lakes , 1998 .

[8]  D. Tilman.  Resource Competition between Plankton Algae: An Experimental and Theoretical Approach , 1977 .

[9]  B. Osborne,et al.  Light and Photosynthesis in Aquatic Ecosystems. , 1985 .

[10]  S. Park,et al.  A stoichiometric model for water quality interactions in macrophyte dominated water bodies , 1997 .

[11]  J. Goudriaan,et al.  A simple and fast numerical method for the computation of daily totals of crop photosynthesis. , 1986 .

[12]  Mark Westoby,et al.  The Self-Thinning Rule , 1984 .

[13]  M. Scheffer,et al.  Dominance of charophytes in eutrophic shallow lakes : when should we expect it to be an alternative stable state? , 2002 .

[14]  A mathematical model of an estuarine seagrass , 1997 .

[15]  E. Best,et al.  Sediment-related growth limitation of Elodea nuttallii as indicated by a fertilization experiment , 1996 .

[16]  F. Wortelboer.  A model on the competition between two macrophyte species in acidifying shallow soft-water lakes in the Netherlands , 1990, Hydrobiological Bulletin.

[17]  Edward J. Rykiel,et al.  Testing ecological models: the meaning of validation , 1996 .

[18]  M. Scheffer,et al.  Aquatic macrophytes: restore, eradicate or is there a compromise? , 2002 .

[19]  E. Best,et al.  Seasonal growth of the submerged macrophyte Ceratophyllum demersum L. in mesotrophic Lake Vechten in relation to insolation, temperature and reserve carbohydrates , 1987, Hydrobiologia.

[20]  N. Knowlton.  Thresholds and Multiple Stable States in Coral Reef Community Dynamics , 1992 .

[21]  C. D. Collins,et al.  A macrophyte submodel for aquatic ecosystems , 1989 .

[22]  M. Barrat-Segretain,et al.  Recolonization of cleared patches by macrophytes: Modelling with point processes and random mosaics , 1997 .

[23]  Marten Scheffer,et al.  Ecological models and the pitfalls of causality , 1994, Hydrobiologia.

[24]  P. Taylor,et al.  Theoretical studies on the coexistence of competing species under continuous-flow conditions. , 1975, Canadian journal of microbiology.

[25]  De Chen,et al.  A mechanistic model for submerged aquatic macrophyte photosynthesis: Hydrilla in ambient and elevated CO2 , 1996 .

[26]  J. Barko,et al.  Comparative Influences of Light and Temperature on the Growth and Metabolism of Selected Submersed Freshwater Macrophytes , 1981 .

[27]  H. Bach.  A dynamic model describing the seasonal variations in growth and the distribution of eelgrass (Zostera marina L.) I. Model theory , 1993 .

[28]  M. Berg,et al.  A comparative study of the use of inorganic carbon resources by Chara aspera and Potamogeton pectinatus , 2002 .

[29]  M. L. Meijer,et al.  Biomanipulation in the Netherlands: 15 years of experience. , 2000 .

[30]  A. McDonnell,et al.  MACROPHYTE GROWTH IN SHALLOW STREAMS: BIOMASS MODEL , 1986 .

[31]  J. Janse,et al.  A model of ditch vegetation in relation to eutrophication , 1998 .

[32]  M. Scheffer.  Ecology of Shallow Lakes , 1997, Population and Community Biology Series.

[33]  Marten Scheffer,et al.  Alternative attractors may boost uncertainty and sensitivity in ecological models , 2003 .

[34]  Marten Scheffer,et al.  Super-individuals a simple solution for modelling large populations on an individual basis , 1995 .

[35]  M. Hootsmans.  Modelling Potamogeton pectinatus: for better or for worse , 1999 .

[36]  M. Scheffer,et al.  Distribution and dynamics of submerged vegetation in a chain of shallow eutrophic lakes , 1992 .

[37]  Erik Jeppesen,et al.  The Structuring Role of Submerged Macrophytes in Lakes , 1998, Ecological Studies.

[38]  R. H. Hodgson.  Growth and Carbohydrate Status of Sago Pondweed , 1966 .

[39]  Jan E. Vermaat,et al.  Lake Veluwe, a Macrophyte-dominated System under Eutrophication Stress , 1994, Geobotany.

[40]  David P. Hamilton,et al.  Interrelations between phytoplankton, submerged macrophytes, black swans (Cygnus atratus) and zooplankton in a shallow New Zealand lake , 1988 .

[41]  R. Wetzel,et al.  Modeling submersed macrophyte growth in relation to underwater light climate: modeling approaches and application potential , 2001, Hydrobiologia.

[42]  R. C. Phillips,et al.  Handbook of seagrass biology : an ecosystem perspective , 1980 .

[43]  William D. Taylor,et al.  Models of aquatic plant productivity: a review of the factors that influence growth , 1997 .

[44]  Takashi Asaeda,et al.  Modelling the effects of macrophytes on algal blooming in eutrophic shallow lakes , 1997 .

[45]  J. Schutten,et al.  Predicting the hydraulic forces on submerged macrophytes from current velocity, biomass and morphology , 2000, Oecologia.

[46]  A. Muhammetoglu,et al.  A three-dimensional water quality-macrophyte interaction model for shallow lakes , 2000 .

[47]  R. Wetzel,et al.  A model of Zostera marina L. Photosynthesis and growth: Simulated effects of selected physical-chemical variables and biological interactions , 1986 .

[48]  I. Ikusima.  Ecological Studies on the Productivity of Aquatic Plant Communities IV Light Condition and Community Photosynthesic Production , 1970 .

[49]  L. Kautsky.  Seed and tuber banks of aquatic macrophytes in the Askö area, northern Baltic proper , 1990 .

[50]  K. Murphy,et al.  Aquatic Weeds: The Ecology and Management of Nuisance Aquatic Vegetation , 1990 .

[51]  A. McDonnell,et al.  Development of a partitioned-biomass model for rooted macrophyte growth , 1997 .

[52]  P. Herman,et al.  SMOES: a simulation model for the Oosterschelde ecosystem , 1994, Hydrobiologia.

[53]  D. Spencer.  Early growth of Potamogeton pectinatus L. in response to temperature and irradiance: Morphology and pigment composition , 1986 .

[54]  R. S. Booth,et al.  A Production Model for Myriophyllum spicatum L. , 1975 .