Anna Hargreaves

Assistant Professor,
McGill University

Department of Biology
Personal page


Biodiversity Post-Doctoral Fellow, University of British Columbia. 2016
PhD, Queen's University. 2014
MSc, University of Calgary. 2007
BSc, Trent University. 2003


My research focuses on interactions among species (biotic interactions) and the dynamics of species range limits. Much of my research is field-based; I conduct large- and small-scale experiments in natural environments to test and refine theoretical ideas in ecology and evolution that have practical conservation relevance. I am especially interested in adaptation in range-edge populations, interactions among flowers and their visitors, and the role biotic interactions play in shaping species’ geographic distributions.

QCBS students

Shannon Meadley Dunphy

(Start: 2018)
Love/hate thy neighbour: neighbour shifts from hosts to competitors across the ranges of hemi-parasitic plants

Cole Larsen

(Start: 2018)
Dispersal evolution across temporally & spatially variable landscapes

Ella Martin

(Start: 2020)
Other QCBS (co-)supervisor: Andrew Hendry
Eco-evolutionary dynamics of seed predators and plant communities in the Galapagos Islands

Joshua Persi

(Start: 2018)
Non-temperature determinants of species' range limits

Antonio Rodriguez-Campbell

(Start: 2020)
What drives global patterns in the strength of species interactions?

Involvement within the QCBS

Examples of species studied

Aloe maculata


28- Adaptation across geographic ranges is consistent with strong selection in marginal climates and legacies of range expansion
Journal Article
Bontrager M , Usui T , Lee‐Yaw J A , Anstett D N , Branch H A , Hargreaves A L , Muir C D , Angert A L ,
2021 Evolution (Date Added: 2021-05-19)

26- Author Correction: Clustered versus catastrophic global vertebrate declines (Nature, (2020), 588, 7837, (267-271), 10.1038/s41586-020-2920-6)
Journal Erratum
Leung B , Hargreaves A L , Greenberg D A , McGill B , Dornelas M , Freeman R ,
2021 Nature (Date Added: 2021-02-09)

25- Clustered versus catastrophic global vertebrate declines
Journal Article
Leung B , Hargreaves A L , Greenberg D A , McGill B , Dornelas M , Freeman R ,
2020 Nature (Date Added: 2020-11-27)

24- Spatial distribution and conservation hotspots of mammals in Canada
Journal Article
Cameron V , Hargreaves A L ,
2020 Facets (Date Added: 2020-11-12)

23- Miniaturizing landscapes to understand species distributions
Journal Article
Larsen C D , Hargreaves A L ,
2020 Ecography (Date Added: 2020-04-12)

22- Local adaptation to biotic interactions: A meta-analysis across latitudes
Journal Article
Hargreaves A L , Germain R M , Bontrager M , Persi J , Angert A L ,
2020 American Naturalist (Date Added: 2020-03-09)

21- Lasting signature of forest fragmentation
Journal Article
Hargreaves A ,
2019 Science (Date Added: 2019-12-22)

20- Thermal tolerance patterns across latitude and elevation
Journal Article
Sunday J , Bennett J M , Calosi P , Clusella-Trullas S , Gravel S , Hargreaves A L , Leiva F P , Verberk W C E P , Olalla-Tárraga M ,
2019 Philosophical transactions of the Royal Society of London. Series B, Biological sciences (Date Added: 2019-07-08)

19- Narrow entrance of short-tubed Aloe flowers facilitates pollen transfer on long sunbird bills
Journal Article
Hargreaves A , Langston G , Johnson S ,
2019 South African Journal of Botany (Date Added: 2019-05-20)

18- Seed predation increases from the Arctic to the Equator and from high to low elevations
Journal Article
Hargreaves A L , Suárez E , Mehltreter K , Myers-Smith I , Vanderplank S E , Slinn H L , Vargas-Rodriguez Y L , Haeussler S , David S , Muñoz J , Carlos Almazán-Núñez R , Loughnan D , Benning J W , Moeller D A , Brodie J F , Thomas H J , Morales M P A ,
2019 Science Advances (Date Added: 2019-03-04)

17- Local adaptation primes cold-edge populations for range expansion but not warming-induced range shifts
Journal Article
Hargreaves A L , Eckert C G ,
2018 Ecology Letters (Date Added: 2018-11-21)

16- Expanding, shifting and shrinking: The impact of global warming on species’ elevational distributions
Journal Article
Freeman B G , Lee-Yaw J A , Sunday J M , Hargreaves A L ,
2018 Global Ecology and Biogeography (Date Added: 2018-09-23)

15- Local adaptation interacts with expansion load during range expansion: Maladaptation reduces expansion load
Journal Article
Gilbert, KJ, Sharp, NP, Angert, AL, Conte, GL, Draghi, JA, Guillaume, F, Hargreaves, AL, Matthey-Doret, R, Whitlock, MC
2017 American Naturalist (Date Added: 2018-01-19)

14- Adaptation to fragmentation: Evolutionarydynamics driven by human influences
Journal Article
Cheptou, PO, Hargreaves, AL, Bonte, D, Jacquemyn, H
2017 Philosophical Transactions of the Royal Society B: Biological Sciences (Date Added: 2018-01-19)

13- Fitness declines towards range limits and local adaptation to climate affect dispersal evolution during climate-induced range shifts
Journal Article
Hargreaves, AL, Bailey, SF, Laird, RA
2015 Journal of Evolutionary Biology (Date Added: 2018-01-19)

12- High-elevation range limit of an annual herb is neither caused nor reinforced by declining pollinator service
Journal Article
Hargreaves, AL, Weiner, JL, Eckert, CG
2015 Journal of Ecology (Date Added: 2018-01-19)

11- Evolution of dispersal and mating systems along geographic gradients: Implications for shifting ranges
Journal Article
Hargreaves, AL, Eckert, CG
2014 Functional Ecology (Date Added: 2018-01-19)

10- Are species' range limits simply niche limits writ large? A review of transplant experiments beyond the range
Journal Article
Hargreaves, AL, Samis, KE, Eckert, CG
2014 American Naturalist (Date Added: 2018-01-19)

9- Floral traits mediate the vulnerability of aloes to pollen theft and inefficient pollination by bees
Journal Article
Hargreaves, AL, Harder, LD, Johnson, SD
2012 Annals of Botany (Date Added: 2018-01-19)

8- Concentrations of 17 elements, including mercury, in the tissues, food and abiotic environment of arctic shorebirds
Journal Article
Hargreaves, AL, Whiteside, DP, Gilchrist, G
2011 Science of the Total Environment (Date Added: 2018-01-19)

7- Concentrations of 17 elements, including mercury, and their relationship to fitness measures in arctic shorebirds and their eggs
Journal Article
Hargreaves, AL, Whiteside, DP, Gilchrist, G
2010 Science of the Total Environment (Date Added: 2018-01-19)

6- Native pollen thieves reduce the reproductive success of a hermaphroditic plant, Aloe maculata
Journal Article
Hargreaves, AL, Harder, LD, Johnson, SD
2010 Ecology (Date Added: 2018-01-19)

5- Consumptive emasculation: The ecological and evolutionary consequences of pollen theft
Journal Article
Hargreaves, AL, Harder, LD, Johnson, SD
2009 Biological Reviews (Date Added: 2018-01-19)

4- Aloe inconspicua: The first record of an exclusively insect-pollinated aloe
Journal Article
Hargreaves, AL, Harder, LD, Johnson, SD
2008 South African Journal of Botany (Date Added: 2018-01-19)

3- Empty flowers as a pollination-enhancement strategy
Journal Article
Bailey, SF, Hargreaves, AL, Hechtenthal, SD, Laird, RA, Latty, TM, Reid, TG, Teucher, AC, Tindall, JR
2007 Evolutionary Ecology Research (Date Added: 2018-01-19)

2- Dark, bitter-tasting nectar functions as a filter of flower visitors in a bird-pollinated plant
Journal Article
Johnson, SD, Hargreaves, AL, Brown, M
2006 Ecology (Date Added: 2018-01-19)

1- Do floral syndromes predict specialization in plant pollination systems? An experimental test in an "ornithophilous" African Protea
Journal Article
Hargreaves, AL, Johnson, SD, Nol, E
2004 Oecologia (Date Added: 2018-01-19)