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THE REALIZED PROGRAMME

ProDynamics'96

Workshop
PROgress in Theory and Applications of Modelling Aquatic Population DYNAMICS
March 5-9, 1996
University of Hamburg, Germany

CONFERENCE SITE

University of Hamburg
GEOMATIKUM Bldg., Lecture Hall No. 2
Bundesstr. 55
D-20146 Hamburg, Germany

Introduction
International Scientific Committee
Local Organizing Committee
Final Programme
Poster Session
Publication of Proceedings

Introduction

Current environmental research faces an unprecedented challenge. The needs to stabilize and to improve the rapidly deteriorating state of the environment as well as to enhance its capacity to sustain an ever increasing stress due to human impacts have become of paramount importance.

Epistemological problems arise when dealing with complex ecological systems. The prevailing scientific methods have developed in the traditional sciences for the purpose of understanding mechanistic. Despite empirical evidence demonstrating the inadequacy of such thinking in the realm of complex systems, old approaches still prevail and new ideas have yet to be developed.

ProDynamics'96 - an interdisciplinary meeting on aquatic system studies has brought together about 100 theoretical and experimental scientists from 22 countries and promoted the exchange of recent results and ideas on the emergence and implications of complex temporal, spatial and spatio-temporal structures in the dynamics of aquatic populations. Theoretical studies of aquatic biological, chemical and physical processes and of their interactions as well as their applications, ranging from water-quality and ecosystem models to management strategies, have been presented. The feedback from participants has shown that one of the main outcomes of the workshop has been progress towards building a bridge between scientific understanding and decision-making in such complex environmental systems.

The editors of Environmental Modeling & Assessment (Baltzer Publ.) have agreed to publish, in a special issue, a selection of carefully refereed papers from those presented at the workshop. The spectrum of topics covers trophic network analyses, mathematical studies of pattern-forming capacities of population-dynamical biomass-based models, individual-based and dynamic-energy-budget modelling of the impacts of environmental stress as well as complex simulation models of certain marine and estuarine ecosystems.

The organizers of the workshop acknowledge the financial and administrative support by the GKSS Research Centre Geesthacht as well as by the Deutsche Forschungsgemeinschaft.

International Scientific Committee

Job W. Baretta (Hørsholm, Denmark)
J. Gomes Ferreira (Monte de Caparica, Portugal)
Ursula Gaedke (Konstanz, Germany)
Thomas G. Hallam (Knoxville, TN, USA)
Horst Malchow, Chairman (Osnabrück, Germany)
Roger M. Nisbet (Santa Barbara, CA, USA)
Cosimo Solidoro (Venice, Italy)
Lewi Stone (Tel Aviv, Israel)

Local Organizing Committee

Iris Grabemann (GKSS Research Centre Geesthacht)
Jens Kappenberg (GKSS Research Centre Geesthacht)
Horst Malchow, Chairman (University of Osnabrück)
Walter Puls (GKSS Research Centre Geesthacht and University of Hamburg)
Eckart Steffen (GKSS Research Centre Geesthacht)

Programme

Tuesday, March 5

11.00-14.00
Registration in the lobby of the Geomatikum
14.00-14.15
Opening and introductory remarks

Session 1: Theoretical concepts I - Environmental stress

Chair: Job W. Baretta (Hørsholm)

14.15-15.00
Thomas G. Hallam (Knoxville, TN). Ecological requisites for aquatic assessment: Bioassays and dynamics in chemically stressed populations and communities.
15.00-15.45
Roger M. Nisbet (Santa Barbara, CA). Energetic response to environmental stress: Relating effects at suborganismal, individual and population levels.
15.45-16.15
Will Wilson (Durham, NC). Cooperation and competition along environmental gradients.

· 16.15-16.45: Coffee Break

Session 2: Food web studies

Chair: Lewi Stone (Tel Aviv)

16.45-17.30
Ursula Gaedke (Konstanz). A comparison of whole-community and ecosystem approaches (biomass size distributions, food web analysis, network analysis, simulation models) to study the structure, function and regulation of pelagic food webs.
17.30-18.00
Kai-W. Wirtz (Kassel). Effective variables in ecosystem models: A new technique to describe adaptation and successsion of plankton communities.
18.00-18.30
Heino O. Fock (Büsum). State diagram of community dynamics.

· 19.00: Welcome Beer in the lobby of the Geomatikum Bldg.

Wednesday, March 6

Session 3: The North and Baltic Sea ecosystems

Chair: Niall Broekhuizen (Hamilton)

09.00-09.45
Job W. Baretta (Hørsholm). Ecological modelling of regional seas: Necessary and unnecessary complexity. Lessons from ERSEM.
09.45-10.15
Andy Bryant, Bill Robertson & Mike Heath (Aberdeen & Glasgow). A model of Calanus finmarchicus spatio-temporal dynamics in the northern North Sea.
10.15-10.45
Francois Carlotti & Dag Slagstad (Villefranche). Population dynamics model of copepod species coupled with a 1D model of phytoplankton dynamics.

· 10.45-11.15: Coffee Break

11.15-12.00
Albertus G. Brinkman (Texel). Is it useful to implement size related process descriptions in an ecosystem model?
12.00-12.30
Thomas Fast, Agmar Müller & Angela Wilhelm (Geesthacht). Modelling of the ecosystem Sylt-Rømø bight.
12.30-13.00
Jürgen Rahmel & Wolfgang Ebenhöh (Norderney & Oldenburg). Assessment of consequences of nutrient reduction measures for the Wadden Sea by use of the AQEM model.

· 13.00-14.30: Lunch Break

14.30-15.00
Kurt Jensen (Hørsholm). The use of ecological models in environmental management of marine projects.
15.00-15.30
Hanne K. Bach (Hørsholm). Modelling of the annual variability of eelgrass biomass and depth distribution.
15.30-16.00
Joachim W. Dippner (Hamburg). Natural variability of a pelagic ecosystem.
16.00-16.30
Sergej V. Semovski (Sopot). Numerical methods of data assimilation in marine ecosystem models.

· 16.30-17.00: Coffee Break

17.00-19.00
Poster Session and General Discussion

Thursday, March 7

Session 4: Theoretical concepts II - Spatio-temporal pattern formation

Chair: Horst Malchow (Osnabrück)

09.00-09.10
Horst Malchow (Osnabrück). Introductory remarks.
09.10-09.55
John Kessler (Tucson, AZ). Individual and collective dynamics of swimming micro-organisms.
09.55-10.25
Sergei V. Petrovskii (Moscow). Modelling of open-sea ecological impact: Impact wave localization and pattern formation.
10.25-10.55
Michael Menzinger & Arkady Rovinsky (Toronto). Differential advection of predator and prey: Its role in the patchiness and enhancement of productivity of the plankton ecosystem.

· 10.55-11.25: Coffee Break

11.25-12.00
Alexander B. Medvinsky, Eckart Steffen & Horst Malchow (Pushchino, Geesthacht & Osnabrück). Spatio-temporal patterns in a nutrient-plankton-fish model.
12.00-12.30
Louise Matthews & John Brindley (Leeds). An excitable medium model for patchiness in plankton populations.
12.30-13.00
Nian She (Seattle, WA). Detecting chaos in aquatic systems.

· 13.00-14.30: Lunch Break

Session 5: Theoretical concepts III - Plankton: Its preys and predators

Chair: J. Gomes Ferreira (Monte de Caparica)

14.30-15.00
Christian Jost & Roger Arditi (Paris). The PEG model in the context of food chains and different functional responses.
15.00-15.30
Jerzy Michalski, Roger Arditi & Jean-Christophe Poggiale (Lausanne, Paris & Marseille). Space heterogeneity and strong predation: Emergence of the ratio-dependence.
15.30-16.00
Markus Kirkilionis (Amsterdam). Structural perturbations of models describing planktonic distributions.
16.00-16.30
Hiroyuki Matsuda, Tokio Wada, Yasuhiro Takeuchi & Yoshiharu Matsumiya (Fukuoka, Yokohama, Hamamatsu & Tokyo). Population dynamics of plankton-feeding pelagic fishes in Japan: Cyclic advantage hypothesis.

· 16.30-17.00: Coffee Break

17.00-17.30
William Silvert (Dartmouth). The role of interactions in long-term population cycles.
17.30-18.00
Hinnerk Boriss & Jonathan Roughgarden (Ploen & Stanford, CA). Sustainable harvesting rates for populations in fluctuating environments.
18.00-18.30
Sami Souissi & Paul Nival (Villefranche). Population dynamics of interacting species: Modelling and consequences of human exploitation.

· 19.30: Conference Dinner at Historischer Gasthof "Anno 1750"

Friday, March 8

Session 6: The Mediterranean and Black Sea ecosystems

Chair: Temel Oguz (Erdemli) & Cosimo Solidoro (Venice)

09.00-09.45
Cosimo Solidoro, E.V. Brando, D. Franco, Roberto Pastres, I. Polenghi & Giovanni Pecenik (Venice). Macroalgae simulation in a 3D water quality model of Venice Lagoon.
09.45-10.15
Andrea Bergamasco & Sandro Carniel (Venice). Modelling the coupled ecosystem Venice Lagoon - Adriatic Sea.
10.15-10.45
Cedric Bacher (Nantes). Modelling the impact of filter-feeders on the primary production. Application to the Thau lagoon.

· 10.45-11.15: Coffee Break

11.15-12.00
Marie-Helene Tusseau & Mortier Laurent (Montrouge & Paris). Biogeochemical modelling of the Gulf of Lions: Sensitivity to hydrodynamics.
12.00-12.30
Andrea Balzano, Roberto Pastres, Cinzia Rossi & Cosimo Solidoro (Cagliari & Venice). A transport-based ecological model for an eutrophic lagoon in Sardinia.
12.30-13.00
Temel Oguz, Huge Ducklow, Paola Malanotte-Rizzoli & Umit Unluata (Erdemli, Gloucester Point, VA & Cambridge, MA). Simulation of annual plankton productivity cycle in the Black Sea by a 1D physical-biological model.

· 13.00-14.30: Lunch Break

Session 7: Rivers and estuaries

Chair: Jens Kappenberg (Geesthacht)

14.30-15.00
Rainer Brüggemann & C.E.W. Steinberg (Neuherberg & Berlin). A comparative evaluation of aquatic effect tests.
15.00-15.30
Niall Broekhuizen, J.C. Rutherford, J.M. Quinn & M.R. Scarsbrook (Hamilton). Land-use patterns and community dynamics in stream ecosystems: An integrated experimental and modelling program.
15.30-16.00
Deborah Hart, P.J. Mulholland, E.R Marzoff, D.L. DeAngelis & S.P. Hendricks (Tel Aviv & Knoxville). Changes in stream characteristics under varying flow and seasonal characteristics.

· 16.00-16.30: Coffee Break

16.30-17.00
Iris Grabemann, Peter Löbel & Agmar Müller (Geesthacht). Loads of the Weser estuary to the North Sea and their seasonal variations.
17.00-17.30
Susanne Rolinski & Kirsten Wolfstein (Hamburg). How to remain in fresh water: Model simulations of algae populations in a tidal estuary.
17.30-18.00
Friedhelm Schroeder (Geesthacht). Water quality in the Elbe estuary: Significance of different processes for the oxygen deficit at Hamburg.

Saturday, March 9

Session 8: Specific ecosystems and modelling techniques

Chair: Thomas G. Hallam (Knoxville, TN)

09.00-09.45
Lewi Stone (Tel Aviv). Coral reef biodiversity and habitat destruction: A model.
09.45-10.15
Pedro Duarte & J. Gomes Ferreira (Monte de Caparica). Dynamic modelling of photosynthesis in marine and estuarine ecosystems.

· 10.15-10.30: Break

10.30-11.00
Broder Breckling, Hauke Reuter & Ulrike Middelhoff (Kiel). An object-oriented modelling strategy to depict activity patterns of organisms in heterogeneous environments.
11.00-11.30
Andre M. de Roos (Amsterdam). Relating individual life-history and population dynamics in Daphnia pulex: Is the population more than a collection of individuals?
11.30-12.00
Janusz Uchmanski (Lomianki). Individual-based modelling: An attempt to classify ecological models.

· 12.00: Closing

Poster Session (Wednesday evening)

(Contributions in alphabetical order of the 1st authors)

Theoretical Aspects

Andrew M. Edwards & John Brindley (Leeds). A rational dynamical systems approach to plankton population modelling.
Ralf Engbert (Potsdam). Spatial structure and extinction in microparasitic infectious diseases.
Paolo Fergola, C. Tenneriello & W.D. Wang (Napoli & Chongqing). Chemostat equations in a polluted environment with delayed nutrient recycling.
Reinhard Heerkloss, Reinhard Mahnke & Natalia Lyssenko (Rostock & Jaroslavl). Chaotic dynamics of a planktonic food web under experimental conditions.
Amit Huppert & Lewi Stone (Tel Aviv). El Nino: Noise driven chaos?
Wolfgang Jansen (Potsdam). Persistence in Lotka-Volterra and replicator systems.
Sinkyu Kang (Umea). Examination of compensatory response in trophic cascade with size-selective consumption model.
Tibor Kmet' (Nitra). Diffusive model of material recycling in a closed aquatic ecosystem.
Morten Liberoth & Erik Mosekilde (Lyngby). Bifurcation structure of a model of competing bacterial populations.
Stefanie Locher-Beland (Hamburg). Study of the existence and stability of year-periodic solutions for mathematical models of marine ecosystems.
Natalia Lyssenko, Reinhard Heerkloss & Reinhard Mahnke (Jaroslavl & Rostock). Phase space diagrams of planktonic food webs.
Alexander B. Medvinsky, M.A. Tsyganov, I.B. Kresteva, I.V. Lysochenko, V.V. Kravchenko & G.R. Ivanitsky (Moscow). Cellular automata models of fluctuation effects in cell communities.
Jonathan W. Pitchford & John Brindley (Leeds). A general model of phytoplankton-nutrient interaction.
Wojciech Szeligiewicz (Lomianki). Consequences of neglecting density- dependent effects in models of phytoplankton dynamics.
Suzanne Touzeau & Jean-Luc Gouze (Sophia Antipolis). On the stock-recruitment relationships.

Applicational Aspects

Denis van Eeckhout & Christiane Lancelot (Brussels). Modelling changes in the foodweb structure of the NW Black Sea ecosystem from 1960 to present.
Deborah Hart, Lewi Stone, Alexander Stern, Tom Berman, Silke Hochstädter, Dietmar Straile & Ursula Gaedke (Tel Aviv, Tiberias & Konstanz). Modelling the energy and nutrient flows in Lake Kinneret (Israel) and Lake Constance (Germany).
Silke Hochstädter, Dietmar Straile, Ursula Gaedke & Lewi Stone (Konstanz & Tel Aviv). Potentials and limitations in modelling the energy and nutrient flow in the Lake Constance food web with special emphasis on the contribution of phytoplankton and bacteria.
Matthias R.M. Hofmann, A. Wischmeyer, U. Bathmann, D. Wolf-Gladrow (Bremerhaven). Phytoplankton dynamics in the Weddell Sea.
Galina V. Lebedeva, Galina Yu. Riznichenko, Sergei I. Pogosyan (Moscow). The relationship between fluorescence parameters of individual microalgae cells and photosynthetic activity of the entire population. Mathematical model.
Alexander S. Lopukhin, Yurij G. Kamenir & Onno Hoffmeister (Sevastopol & Berlin). Nontraditional analysis of the microplankton structure: Size- spectral characteristic of the functional parameters of the community as a single whole. (presented by I. Polikarpov, Sevastopol)
Giovanni Pecenik, Roberto Pastres, Cosimo Solodoro, I. Polenghi, S. & C. Dejak (Venice). A transport 3D model of the Garda Lake: General circulation pattern.
Igor Polikarpov (Sevastopol). Pattern formation and dynamics in protistan communities: Modelling and field experiments.
Alex H. Ross (Christchurch). Modelling the sustainability of cultured shell fisheries.
Mona Vetter & Gottfried Jetschke (Jena). The effect of natural disturbances on the diversity of a benthic community in small rivers.
Marimar G. Villagarcia-Ubeda (Las Palmas). Modelling passive pollution through cellular automata in the coast.