The Rollinson Lab 

Evolutionary ecology, long-term data, environmental change

22) Rollinson N., Rowe L. in press. Oxygen limitation at the larval stage and the evolution of maternal investment per offspring in aquatic environments. The American Naturalist

21) Armstrong D., Keevil M., Rollinson N., Brooks R.J., in press. Subtle variation in indeterminate growth leads to major variation in survival and lifetime reproductive output in a long-lived reptile. Functional Ecology

20) Edge C.B.*, Rollinson N.*, Brooks R.J., Congdon J., Iverson J., Janzen F., and Litzgus J.  2017 Phenotypic plasticity of nest timing in a post-glacial landscape: how do long-lived reptiles adapt to thermal time constraints?  Ecology. 98 512-524
*Author contribution was equal

19) Rollinson N., Rowe L. 2016. The positive correlation between maternal size and offspring size: fitting pieces of a life-history puzzle. Biological Reviews 91:1134-1148

18) Rollinson N., Rowe L. 2015. Persistent directional selection on body size and a resolution to the paradox of stasis.  Evolution 69:2441-2451

17) Rollinson N., Hackett D. 2015. Experimental assessment of agonistic behavior, chemical communication, spacing, and intersexual associations of the red-backed salamanders near its northern range limit. Canadian Journal of Zoology 93:773-781

16) Rollinson N*., Keith D.A.*, Debes P.V., Houde A.L.S., McBride M., Hutchings J.A. 2014. Risk assessment of inbreeding and outbreeding depression in a captive breeding program.
Conservation Biology. 28:529–540      

*Author contribution was equal

15) Rollinson N., Hutchings J.A. 2013. Environmental quality predicts optimal egg size in the wild.
The American Naturalist. 182:76–90

14) Rollinson N.*, Edge C.B.*, Brooks R.J. 2013. Recurrent violations of invariant rules for offspring size: evidence from turtles and the implications for small clutch size models. Oecologia.  172: 973–982
*Author contribution was equal

13) Stahlschmidt Z.R., Rollinson N., Acker M., Adamo S.A. 2013. Are all eggs created equal? Food availability and the fitness tradeoff between reproduction and immunity. Functional Ecology. 27:800–806

12) Rollinson N., Hutchings J.A. 2013. The relationship between offspring size and fitness: integrating theory and empiricism. Ecology. 94: 315–324

11) Congdon J.D., Gibbons J.W. , Brooks R.J., Rollinson N., Tsaliagos R.N. 2013. Indeterminate growth in long-lived freshwater turtles as a component of individual fitness. Evolutionary Ecology. 27: 445–459

10) Rollinson N., Farmer R.G., Brooks R.J. 2012. Widespread reproductive variation in North American turtles: temperature, egg size and optimality. Zoology. 115:160-169
*Featured on the cover of Zoology (June 2012)

9) Rollinson N., Hutchings J.A. 2011. Body size-specific maternal effects on the offspring environment shape juvenile phenotypes in Atlantic salmon. Oecologia. 166:889-98
8) Rollinson N., Hutchings J.A. 2011. Why does egg size of salmonids increase with the mean size of popultion spawning gravels?  Canadian Journal of Fisheries and Aquatic Sciences. 68:1307-1315

7) Rollinson N., Hutchings J.A. 2010. Why does egg size increase with maternal size? Effects of egg size and egg density on offspring phenotypes. Evolutionary Ecology Research. 12:949-960
6) Rollinson N., Brooks R.J. 2008. Optimal offspring provisioning when egg size is 'constrained’: a case study with the painted turtle. Oikos. 117:144-151
5) Rollinson N., Brooks R.J. 2008. Sources and significance of among individual reproductive variation in a northern population of painted turtles. Copeia. 2008:533-541

4) Rollinson N., Tattersall G.J., Brooks R.J. 2008. Overwintering habitats of a northern population of Painted Turtles (Chrysemys picta): winter temperature selection and dissovled oxygen concentrations. Journal of Herpetology. 42:312-321
3) Carrière M.A., Rollinson N., Suley A.N., Brooks R.J. 2008. Thermoregulation when the growing  season is short: sex-biased basking patterns in a northern population of painted turtles.
Journal of Herpetology. 42:206-209

2) Rollinson N., Brooks R.J. 2007. Marking nests increases the frequency of nest depredation in a northern population of painted turtles. Journal of Herpetology. 41:174-176
1) Rollinson N., Brooks R.J. 2007. Proximate constraints on reproductive output in a northern population of painted turtles: an empirical test of the bet-hedging paradigm.
Canadian Journal of Zoology. 85:177-184

News Archive

Winter 2018
Njal is appointed to the Amphibians and Reptiles Species Specialist Subcommittee of COSEWIC

Spring 2017
Patrick Moldowan wins a prestigious Alexander Graham Bell CGS-Doctoral Award!

Melanie Massey wins a prestigious Alexander Graham Bell CGS-M Award!

December 16th, 2016
Melanie Massey wins UofT's TA of the year award - congrats Melanie!

September 1st, 2016

Hollis Dahn wins a prestigious Connaught Scholarship. Congrats Hollis!

April 22nd 2016
Njal is awarded the 2016 Canadian Society for Ecology and Evolution Early Career Award.  This award recognizes outstanding accomplishments and promising future research potential in ecology and evolution by scientists early in their careers.

September 11th, 2015
New paper "Persistent directional selection on body size and a resolution to the paradox of stasis" is covered on the eco-evo blog.

August 15th, 2014

This entry is a plug for the excellent programs offered by NIMBioS. Last week Njal attended a NIMBioS tutorial on evolutionary quantitative genetics at the University of Tennessee. The workshop was amazing, both in terms of content and instruction. Njal strongly encourage all evolutionary ecologists to check out the NIMBioS website, and the ongoing tutorials they offer.

September 3rd,
In a good-natured blog post, Njal's PhD examiner, Dr. Andrew Hendry (McGill) criticized the conclusion of Njal's PhD thesis.
Njal defended his conclusion in a tongue-in-cheek reply to Andrew. The exchange has since been picked up by Dynamic Ecology and the Carnival of Evolution.