Identification of signals describing pairwise interaction in plankton, bacteria and bacteriophage : a study of model, microcosm and lake
Doctoral thesis, Peer reviewed
Paper D: Brendan, J.M.B.; Kerr, B.; Jessup, C.M.; Hughes, J.B.; Sandvik, G.: Trade-offs and coexistence in microbial microcosms. Published in Antonie van Leeuwenhoek 81(2002), No. 1-4, p. 107-115. Copyright 2002 Kluwer Academic Publishers. (1.155Mb)
Paper C: Sandvik, G.; Jessup, C.M.; Seip, K.L.; Bohannan, B.J.M.: Using the angle frequency method to detect signals of competition and predation in experimental time series. Published in Ecology letters 7(2004), No. 8, p. 640-652. Copyright 2002 Blackwell. (191.0Kb)
Paper B: Sandvik, G.; Seip, K.L.; Pleym, H.: Extracting signals of predation and competition from paired plankton time series. Published in Archiv für Hydrobiologie 157(2003), No. 4, p. 455-471. Copyright 2003 E.Schweizerbart'sche Verlagsbuchhandlung. http://www.schweizerbart.de (1.502Mb)
Paper A: Sandvik, G.; Seip, K.L.; Pleym, H.: An anatomy of interactions among species in a seasonal world. Published in Oikos 99(2002), No. 2, p. 260-271. Copyright 2002 Blackwell. (1.381Mb)
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This study concerns interaction between organisms. Such interactions are often studied through organism abundances over periods of time (time-series). Time-series reflect both internal (biological) and external (environmental) factors and the separation of these factors from time-series is a non-trivial task. The first two papers represent an introductory stage where a new approach to time-series analysis is presented and where two-species interactions are explored with synthetic data obtained from model simulations and lake plankton data. Paper 3 reports on time-series analysis of an experimental ecological system in which interactions are studied in greater detail. Paper 4 covers experiments testing the stability of demographic trade-offs in microcosms. By doing nearly equivalent analyses within a range of ??cological realism??of the time-series, this thesis puts the suggested method through a systematic test and explores some basic assumptions in time-series analysis. The first part of the thesis consists of a summary where this work is presented and discussed in the context of current time-series analysis. The second part contains the four papers.
Avhandling (dr.ing.) - Høgskolen i Telemark / Norges teknisk-naturvitenskapelige universitet. The thesis also contains the following papers: Paper 1: Gunnar Sandvik, Knut L. Seip & Harald Pleym. 2002. An anatomy of interactions among species in a seasonal world. Oikos 99: 260-271. Paper 2: Gunnar Sandvik, Knut L. Seip & Harald Pleym. 2003. Extracting signals of predation and competition from paired plankton time-series. Archive für Hydrobiologie 154(4): 455-471. Paper 3: Gunnar Sandvik, Christine Jessup, Knut L. Seip & Brendan Bohannan. 2004. Using the angle frequency method to detect signals of competition and predation in experimental time series. Ecology Letters 7(8): 640-652. Paper 4: Brendan J. M. Bohannan, Ben Kerr, Christine Jessup, Jennifer Hughes, & Gunnar Sandvik. 2002. Trade-offs and coexistence in microbial microcosms. Antonie van Leeuwenhoek 81: 107??15.