Lennart Persson

Contact Information

Position:

Professor emeritus

personbild

Works at:

Ecology and Environmental Sciences

Address:

Umeå universitet
SE-901 87 Umeå
Sverige

Visiting Address:

KBC-huset, plan 4, Linnaeus väg 6, Umeå, A4-34-15

Tel:

+46 90 786 63 16

Email:

lennart.persson@emg.umu.seEmail 1

lennart.persson@umu.seEmail 2

Lync:

Get in touch via Lync

Web Page:

http://www.emg.umu.se/om-institutionen/personal/persson-lennart Web Page
http://www.emg.umu.se/english/about-the-department/staff/persson-lennart Web Page

Research

Most organisms on Earth undergo major changes in size and/or morphology over their life cycle and the rate by which these changes occur is generally dependent on food supply. In many organisms this involves a change in individual weight many orders of magnitude from that the individual starts to search for resources independently until it reaches maturity. In fact, even in unicellular organisms will the individual cell exhibit at least a doubling (often more) in weight from cell division up to mitosis. This ubiquitous presence of ontogenetic development among organisms sharply contrasts to contemporary ecological theory as presented in standard textbooks where population dynamics is defined as fluctuations in time and space in number of individuals only and ontogenetic variation is totally ignored.

My research interest has over my whole scientific career delt with the implications of ontogenetic variation on population and community processes. Research approaches used include experimental studies from laboratory systems to whole lake experiments, long-term field studies and theoretical modeling. My research has since more than 20 years been carried out in close collaboration with my colleague and friend André M. de Roos, a theoretical biologist at the University of Amsterdam.

Our research has now reached a state of conceptualization where we propose a novel general theory of ecology. In this generic theory, contemporary unstructured ecological theory represents a limiting case only with ontogenetic symmetry within a richer generic theory that also includes ontogenetic asymmetry. Ontogenetic symmetry is defined as the special case when mass-specific rates of biomass production through somatic growth and reproduction and biomass loss through mortality are independent of body size. In all other cases ontogenetic asymmetry prevails. Ontogenetic asymmetry has major implications for both community structure and population dynamics. You can read more about this in our book Population and Community Ecology of Ontogenetic Development recently published in the Princeton University, Monographs in Population Biology Series.

You can also view a seminar (YouTube) entitled Symmetry breaking in ecological systems through different energetic efficiencies of juveniles and adults – a new paradigm unfolds? where I synthesize the main aspects of our present thinking. Also check 4 webinars by André De Roos that cover the most salient results of our book (http://staff.science.uva.nl/~aroos/Research/Webinars/index.html).

Publications 2004-

Author

Title

Year sorteringsordning

Fulltext

Persson, Lennart
Van Leeuwen, Anieke
De Roos, Andre M.

The ecological foundation for ecosystem-based management of fisheries: mechanistic linkages between the individual-, population-, and community-level dynamics
ICES Journal of Marine Science, 71(8): 2268-2280

2014

-

Jäger, Christoph G.
Vrede, Tobias
Persson, Lennart; et al.

Interactions between metazoans, autotrophs, mixotrophs and bacterioplankton in nutrient-depleted high DOC environments: a long-term experiment
Freshwater Biology, 59(8): 1596-1607

2014

-

Huss, Magnus
Persson, Lennart
Borcherding, Jost; et al.

Timing of the diet shift from zooplankton to macroinvertebrates and size at maturity determine whether normally piscivorous fish can persist in otherwise fishless lakes
Freshwater Biology, 58(7): 1416-1424

2013

-

Persson, Lennart
Amundsen, Per Arne
De Roos, Andre M.; et al.

Density-dependent interactions in an Arctic char - brown trout system: competition, predation, or both?
Canadian Journal of Fisheries and Aquatic Sciences, 70(4): 610-616

2013

-

De Roos, Andre M.
Metz, Johan A. J.
Persson, Lennart

Ontogenetic symmetry and asymmetry in energetics
Journal of Mathematical Biology, 66(4-5): 889-914

2013

-

Reichstein, Birte
Schröder, Arne
Persson, Lennart; et al.

Habitat complexity does not promote coexistence in a size-structured intraguild predation system
Journal of Animal Ecology, 82(1): 55-63

2013

-

van Leeuwen, Anieke
Huss, Magnus
Gardmark, Anna; et al.

Predators with multiple ontogenetic niche shifts have limited potential for population growth and top-down control of their prey
American Naturalist, 182(1): 53-66

2013

Download

Persson, Lennart
de Roos, Andre M

Symmetry breaking in ecological systems through different energy efficiencies of juveniles and adults
Ecology, 94(7): 1487-1498

2013

Download

de Roos, A. M.
Persson, Lennart

Population and community ecology of ontogenetic development

2013

-

Nilsson, Karin A.
Persson, Lennart

Refuge availability and within-species differences in cannibalism determine population variability and dynamics
Ecosphere, 4(8): 100-

2013

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Page Editor: Elisabet Carlborg
2013-04-02

Print page

Research area

Freshwater ecology

Video:Symmetry breaking in ecological systems

Seminar:

Symmetry breaking in ecological systems through different energetic efficiencies of juveniles and adults – a new paradigm unfolds?

Lennart Persson, professor in Aquatic Ecology, Umeå university.