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Johan Hollander

AREAS OF INTEREST

My interests within biology are questions concerning evolution biology, essentially speciation and evolution of reproductive barriers in non-allopatric systems. I am studying ecological mechanisms responsible for creating disruptive selection among populations, and evolution of reproductive barriers between local adapted populations.

To address these topics I use the marine ovoviviparous periwinkle Littorina saxatilis as a model organism. To examine phenotypic adaptation driven from natural selection or environment induced signals, I employ geometric morphometric analysis (New Morphometrics), which is a highly efficient method to assess shape.

My interests also involve the study of evolution of phenotypic plasticity and life history strategies, especially among divergent populations that has not yet evolved complete reproductive isolation.


PUBLICATIONS

Hollander J. (submitted) Strong selection over a steep environmental gradient impose local adaptation and shifting phenotypic variation in a clad of marine snails. Marine Ecology Progress Series

Uller T., J. Hollander, L. Astheimer & M. Olsson. (submitted) Sex-specific developmental plasticity in response to yolk corticosterone in an oviparous lizard. Journal of Experimental Biology

Sadedin S., Hollander J., Panova M., Johannesson K. & S. Gavrilets (submitted) Case studies and mathematical models of ecological speciation 3: Ecotype formation in a Swedish snail. Molecular Ecology

Kemppainen P., M. Panova, J. Hollander & K. Johannesson (submitted) Reticulate Evolution in Marine Snails – Evidence from Morphology, Microsatellites and Mitochondrial DNA. Evolution

Johannesson K., Sundin A, Lindegarth M, Jonsson P. R., Havenhand J. N. & J. Hollander. (2008) Male Discrimination of Female Mucous Trails Permits Assortative Mating in a Marine Snail Species. Evolution DOI: 10.1111/j.1558-5646.2008.00510.x

Hollander J. 2008. Testing the grain-size model for the evolution of phenotypic plasticity. Evolution 62: 1381-1389. [cover acknowledgment]

Conde-Padín P., R. Cruz, J. Hollander & E. Rolán-Alvarez. 2008. Revealing the mechanisms of sexual isolation in a case of sympatric and parallel ecological divergence. Biological Journal of Linnean Society 94: 513-526.

Hollander J., Adams D. & K. Johannesson. 2006. Evolution of adaptation through allometric shifts in a marine snail. Evolution 60: 2490-2497.

Hollander J., Collyer, M. L., Adams, D.C. & K. Johannesson. 2006. Phenotypic plasticity in two marine snails: constraints superseding life-history. Journal of Evolutionary Biology 19: 1861-1872.

Panova M., Hollander, J. & K. Johannesson. 2006. Site-specific genetic divergence in parallel hybrid zones suggests non-allopatric evolution of reproductive barriers. Molecular Ecology 15: 4021-4031.

Hollander J., Lindegarth M. & K. Johannesson. 2005. Local adaptation but not geographic separation promotes assortative mating in a snail - support for ecological speciation. Animal Behaviour 70: 1209-1217.


From 2002 till 2005, I was part of a scientific network sponsored by the European Union, named EUMAR (European Marine Genetic Biodiversity: www.eumar.tmbl.gu.se). EUMAR delivered baseline information on genetic variation in marine habitats and predicted effects on biodiversity at the genetic level from various human impacts.


To my personal homepage go to:

www.johan-hollander.staff.shef.ac.uk


EVOLUTION AV REPRODUKTIONSBARRIÄRER

Mina intressen inom biologin är evolutionära frågeställningar, främst då artbildningsprocesser och reproduktionsbarriärer i sympatriska system. Min forskning fokuserar på att förstå de ekologiska processer som evolverar fram reproduktionsbarriärer mellan arter. Jag använder den marina, ovovivipara strandsnäckan Littorina saxatilis som modellorganism för att studera de mekanismer som kan generera divergens mellan lokalt anpassade populationer av olika ekotyper. Jag intresserar mig också för att föstå evolution av phenotypisk plasticitet och livshistorie strategier mellan populationer under divergent selektion. För att studera lokalt anpassade populationer har jag använt mig av geometrisk morfologi (Morphometrics) som är en mycket kraftfull metod för att studera fenotypiska formskillnader.

En stor del av arbete har finansierats utav EUMAR (European Marine Genetic Biodiversity: www.eumar.tmbl.gu.se) som är ett europeiskt samarbetsprojekt som involverar ett antal forkargrupper i flera europeiska länder. Detta projekt har till syfte att undersöka biodiversitet på genetisk nivå för att kunna arbeta fram generella riktlinjer vid bevarandet av biologisk mångfald.


VETENSKAPLIGA PUBLIKATIONER

Hollander J. (submitted) Strong selection over a steep environmental gradient impose local adaptation and shifting phenotypic variation in a clad of marine snails. Marine Ecology Progress Series

Uller T., J. Hollander, L. Astheimer & M. Olsson. (submitted) Sex-specific developmental plasticity in response to yolk corticosterone in an oviparous lizard. Journal of Experimental Biology

Sadedin S., Hollander J., Panova M., Johannesson K. & S. Gavrilets (submitted) Case studies and mathematical models of ecological speciation 3: Ecotype formation in a Swedish snail. Molecular Ecology

Kemppainen P., M. Panova, J. Hollander & K. Johannesson (submitted) Reticulate Evolution in Marine Snails – Evidence from Morphology, Microsatellites and Mitochondrial DNA. Evolution

Johannesson K., Sundin A, Lindegarth M, Jonsson P. R., Havenhand J. N. & J. Hollander. (2008) Male Discrimination of Female Mucous Trails Permits Assortative Mating in a Marine Snail Species. Evolution DOI: 10.1111/j.1558-5646.2008.00510.x

Hollander J. 2008. Testing the grain-size model for the evolution of phenotypic plasticity. Evolution 62: 1381-1389. [cover acknowledgment]

Conde-Padín P., R. Cruz, J. Hollander & E. Rolán-Alvarez. 2008. Revealing the mechanisms of sexual isolation in a case of sympatric and parallel ecological divergence. Biological Journal of Linnean Society 94: 513-526.

Hollander J., Adams D. & K. Johannesson. 2006. Evolution of adaptation through allometric shifts in a marine snail. Evolution 60: 2490-2497.

Hollander J., Collyer, M. L., Adams, D.C. & K. Johannesson. 2006. Phenotypic plasticity in two marine snails: constraints superseding life-history. Journal of Evolutionary Biology 19: 1861-1872.

Panova M., Hollander, J. & K. Johannesson. 2006. Site-specific genetic divergence in parallel hybrid zones suggests non-allopatric evolution of reproductive barriers. Molecular Ecology 15: 4021-4031.

Hollander J., Lindegarth M. & K. Johannesson. 2005. Local adaptation but not geographic separation promotes assortative mating in a snail - support for ecological speciation. Animal Behaviour 70: 1209-1217.


Till min personliga hemsida, gå till:

www.johan-hollander.staff.shef.ac.uk

 

 

Johan.Hollander@tmbl.gu.se