Jan Ohlberger

• Ohlberger, Jan Philipp; Langangen, Øystein; Winfield, Ian J & Vindenes, Yngvild (2019). The importance of variation in offspring body size for stability in cannibalistic populations. Oikos.  ISSN 0030-1299.  129(1), s 59- 69 . doi: 10.1111/oik.05507 Show summary

  Animals exhibit remarkable intraspecific variation in phenotypic traits such as body size. Understanding how such trait variation affects population and ecosystem dynamics is critically important, because future environmental change and human impacts are expected to alter phenotypic trait distributions. In species with seasonal reproduction, offspring size variation within cohorts is ubiquitous, yet we know little about its implications for population stability. In addition, long‐term monitoring data indicate that changes in offspring size variation occur at ecologically relevant time scales. Here, we study the consequences of changing offspring size variation by developing and analysing an integral projection model (IPM). Our model accounts for size‐dependent cannibalism as well as additional density regulation occurring during the first year. The model is parameterized using literature values and long‐term monitoring data for pike Esox lucius, a common fish predator in temperate freshwater ecosystems, but the general model structure applies to a wide range of size‐structured organisms. Our analyses demonstrate that a wide size distribution of offspring promotes stable dynamics, whereas narrow distributions can be destabilizing because cannibalism increases the annual variation in mean offspring mortality. Our results indicate that the stabilizing effect of offspring size variation is likely an important property of size‐structured organisms with seasonal reproduction and cannibalistic behaviour. This work highlights the importance of intracohort trait variation and describes how variation in body size can shape the dynamics of animal populations.

• Langangen, Øystein; Ohlberger, Jan; Stige, Leif C.; Durant, Joel M.; Ravagnan, Elisa; Stenseth, Nils C. & Hjermann, Dag Ø. (2017). Cascading effects of mass mortality events in Arctic marine communities. Global Change Biology.  ISSN 1354-1013.  23(1), s 283- 292 . doi: 10.1111/gcb.13344 Full text in Research Archive.
• Langangen, Øystein; Olsen, Erik Joel Steinar; Stige, Leif Christian; Ohlberger, Jan Philipp; Yaragina, Natalia A.; Vikebø, Frode Bendiksen; Bogstad, Bjarte; Stenseth, Nils Christian & Hjermann, Dag Øystein (2017). The effects of oil spills on marine fish: Implications of spatial variation in natural mortality. Marine Pollution Bulletin.  ISSN 0025-326X.  119(1), s 102- 109 . doi: 10.1016/j.marpolbul.2017.03.037 Full text in Research Archive.
• Edeline, Eric; Groth, Andreas; Cazelles, Bernard; Claessen, David; Winfield, Ian J.; Ohlberger, Jan Philipp; Vøllestad, Leif Asbjørn; Stenseth, Nils Christian & Ghil, Michael (2016). Pathogens trigger top-down climate forcing on ecosystem dynamics. Oecologia.  ISSN 0029-8549.  181, s 519- 532 . doi: 10.1007/s00442-016-3575-8
• Patin, Rémi; Rogers, Lauren & Ohlberger, Jan Philipp (2016). Using a state-space population model to detect age-dependent species interactions. Canadian Journal of Fisheries and Aquatic Sciences.  ISSN 0706-652X.  73(5), s 811- 818 . doi: 10.1139/cjfas-2015-0004
• Ohlberger, Jan Philipp & Langangen, Øystein (2015). Population resilience to catastrophic mortality events during early life stages. Ecological Applications.  ISSN 1051-0761.  25(5), s 1348- 1356 . doi: 10.1890/14-1534.1.sm
• Hidalgo, Manuel; Olsen, Esben Moland; Ohlberger, Jan; Saborido-Rey, Francisco; Murua, Hilario; Piñeiro, Carmen & Stenseth, Nils Christian (2014). Contrasting evolutionary demography induced by fishing: The role of adaptive phenotypic plasticity. Ecological Applications.  ISSN 1051-0761.  24(5), s 1101- 1114 . doi: 10.1890/12-1777.1
• Ohlberger, Jan; Rogers, Lauren & Stenseth, Nils Christian (2014). Stochasticity and determinism: How density-independent and density-dependent processes affect population variability. PLOS ONE.  ISSN 1932-6203.  9(6) . doi: 10.1371/journal.pone.0098940 Full text in Research Archive.
• Ohlberger, Jan; Thackeray, Stephen J.; Winfield, Ian J.; Maberly, Stephen C. & Vøllestad, Leif Asbjørn (2014). When phenology matters: Age-size truncation alters population response to trophic mismatch. Proceedings of the Royal Society of London. Biological Sciences.  ISSN 0962-8452.  281(1793) . doi: 10.1098/rspb.2014.0938
• Vindenes, Yngvild; Edeline, Eric; Ohlberger, Jan; Langangen, Øystein; Winfield, Ian J.; Stenseth, Nils Christian & Vøllestad, Leif Asbjørn (2014). Effects of climate change on trait-based dynamics of a top predator in freshwater ecosystems. American Naturalist.  ISSN 0003-0147.  183(2), s 243- 256 . doi: 10.1086/674610 Full text in Research Archive.
• Ohlberger, Jan (2013). Climate warming and ectotherm body size - from individual physiology to community ecology. Functional Ecology.  ISSN 0269-8463.  27(4), s 991- 1001 . doi: 10.1111/1365-2435.12098
• Ohlberger, Jan; Brannström, Åke & Dieckmann, Ulf (2013). Adaptive Phenotypic Diversification along a Temperature-Depth Gradient. American Naturalist.  ISSN 0003-0147.  182(3), s 359- 373 . doi: 10.1086/671169 Full text in Research Archive.
• Ohlberger, Jan; Villar, Jaime Otero; Edeline, Eric; Winfield, Ian J.; Stenseth, Nils Christian & Vøllestad, Leif Asbjørn (2012). Biotic and abiotic effects on cohort size distributions in fish. Oikos.  ISSN 0030-1299. . doi: 10.1111/j.1600-0706.2012.19858.x
• Mehner, Thomas; Busch, Susan; Clemmesen, Catriona; Helland, Ingeborg Palm; Hölcker, Franz; Ohlberger, Jan & Peck, Myron A. (2012). Ecological commonalities among pelagic fishes: comparison of freshwater ciscoes and marine herring and sprat. Marine Biology.  ISSN 0025-3162.  159, s 2583- 2603 . doi: 10.1007/s00227-012-1922-9
• Ohlberger, Jan; Langangen, Øystein; Stenseth, Nils Christian & Vøllestad, Leif Asbjørn (2012). Community-Level Consequences of Cannibalism. American Naturalist.  ISSN 0003-0147.  180(6), s 791- 801 . doi: 10.1086/668080 Full text in Research Archive.
• Ohlberger, Jan; Mehner, Thomas; Staaks, Georg & Hölker, F. (2012). Intraspecific temperature dependence of the scaling of metabolic rate with body mass in fishes and its ecological implications. Oikos.  ISSN 0030-1299.  121, s 245- 251 . doi: 10.1111/j.1600-0706.2011.19882.x
• Langangen, Øystein; Edeline, Eric; Ohlberger, Jan; Winfield, Ian J.; Fletcher, Janice M.; James, J. Ben; Stenseth, Nils Christian & Vøllestad, Leif Asbjørn (2011). Six decades of pike and perch population dynamics in Windermere. Fisheries Research.  ISSN 0165-7836.  109, s 131- 139 . doi: 10.1016/j.fishres.2011.01.029
• Ohlberger, Jan; Edeline, Eric; Vøllestad, Leif Asbjørn; Stenseth, Nils Christian & Claessen, David (2011). Temperature-Driven Regime Shifts in the Dynamics of Size-Structured Populations. American Naturalist.  ISSN 0003-0147.  177(2), s 211- 223 . doi: 10.1086/657925
• Ohlberger, Jan; Langangen, Øystein; Edeline, Eric; Claessen, David; Winfield, Ian J.; Stenseth, Nils Christian & Vøllestad, Leif Asbjørn (2011). Stage-specific biomass compensation by juveniles in response to increased adult mortality in a wild fish population. Ecology.  ISSN 0012-9658.  92(12), s 2175- 2182 . doi: 10.1890/11-0410.1
• Ohlberger, Jan; Langangen, Øystein; Edeline, Eric; Olsen, Esben Moland; Winfield, Ian J.; Fletcher, Janice M.; James, J. Ben; Stenseth, Nils Christian & Vøllestad, Leif Asbjørn (2011). Pathogen-induced rapid evolution in a vertebrate life-history trait. Proceedings of the Royal Society of London. Biological Sciences.  ISSN 0962-8452.  278(1702), s 35- 41 . doi: 10.1098/rspb.2010.0960

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• Bellier, Edwige; Langangen, Øystein & Ohlberger, Jan Philipp (2017). Stage-dependent interactions of two harvested competitors.
• Ohlberger, Jan (2014). Adaptive phenotypic diversification along a temperature-depth gradient – an evolutionary model based on laboratory and field data.
• Ohlberger, Jan (2013). Stochasticity and determinism: How density-independent and density-dependent processes affect population variability.
• Vindenes, Yngvild; Edeline, Eric; Ohlberger, Jan; Langangen, Øystein; Winfield, Ian J.; Stenseth, Nils Christian & Vøllestad, Leif Asbjørn (2013). Effects of climate warming on trait-based dynamics in a freshwater top predator.
• Vindenes, Yngvild; Edeline, Eric; Ohlberger, Jan; Langangen, Øystein; Winfield, Ian J.; Stenseth, Nils Christian & Vøllestad, Leif Asbjørn (2013). Trait-based dynamics of a top predator in freshwaters and effects of climate change.
• Vindenes, Yngvild; Ohlberger, Jan; Langangen, Øystein & Winfield, Ian J. (2013). How does carrying capacity depend on temperature? A density dependent IPM for pike (Esox lucius).
• Ohlberger, Jan (2012). Biomass overcompensation revealed by long-term time series data from Windermere.
• Ohlberger, Jan (2012). Cannibalism effects on species interactions and community structure.
• Ohlberger, Jan (2012). Community-level consequences of cannibalism.
• Ohlberger, Jan (2012). Ecological and evolutionary responses to size-selective mortality caused by a disease outbreak in Windermere perch.
• Ohlberger, Jan (2012). Ecological and evolutionary responses to size-selective mortality – a disease outbreak in Windermere perch as a large-scale natural experiment.
• Rouyer, Tristan Alexander; Sadykov, Alexander; Ohlberger, Jan & Stenseth, Nils Christian (2012). Does increasing mortality change the response of fish populations to environmental fluctuations?. Ecology Letters.  ISSN 1461-023X.  15(7), s 658- 665 . doi: 10.1111/j.1461-0248.2012.01781.x
• Ohlberger, Jan (2011). Stage-specific biomass overcompensation by juveniles in response to increased adult mortality.
• Ohlberger, Jan; Edeline, Eric; Vøllestad, Leif Asbjørn; Stenseth, Nils Christian & Claessen, David (2011, 10. januar). PR: Temperature Driven Regime Shifts in the Dynamics of Size-Structured Populations. [Internett].  American Society of Naturalists.
• Ohlberger, Jan (2010). An empirically calibrated model of adaptive diversification along an environmental temperature‐depth gradient.
• Ohlberger, Jan (2010). Temperature-driven regime shifts in size-structured populations.
• Ohlberger, Jan (2009). A physiological pathway in coregonid speciation.

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