Radu Guiasu

Associate Professor

Biology

   York Hall 361
   416-736-2100 x 88174
   rguiasu@glendon.yorku.ca
   https://www.researchgate.net/profile/Radu_Guiasu

Professor Guiasu is the recipient of the Principal's Teaching Excellence Award at Glendon for tenure-track faculty members (2008-2009) and the President's University-Wide Teaching Award at York University (2009-2010). He has earned four university degrees (Specialized Honours B.Sc. in Biology from York; and B.Ed. - Education; M.Sc. and Ph.D. - Zoology from the University of Toronto) and, as an ecologist, he has conducted research in the field, the laboratory, and museum collections.

Environment, Ecology, Ethology, Conservation Biology, Freshwater Biology, Invasion Biology, Astacology, Ichthyology, Evolutionary Biology, Phylogenetics 

Doctorate:
Zoology, University of Toronto
Masters:
Zoology, University of Toronto 



introduced species; ecology; ethology; crayfish; fish; agonistic behaviours; game theory models; interspecific competition; ecosystem changes over time; phylogenetics; conservation biology; biodiversity.

Books

    •    GUIASU, R. C. 2016. Non-native species and their role in the environment.- the need for a broader perspective. Brill Academic Publishers. Leiden and Boston. ISBN 978-90-04-17266-1 (hardcover book) and ISBN 978-90-47-42613-4 (e-book version). XII + 316 pages with 34 illustrations. 
 
     •    GUIASU, R. C. and S. GUIASU. 2003. Entropy in Ecology and Ethology. Nova Science Publishers, Inc., New York. ISBN 1-59033-743-3. 330 pages.

Journal Articles

GUIASU, R. C. 2021. Range expansion of the vulnerable crayfish Creaserinus fodiens (Cottle, 1863) (Decapoda, Cambaridae) in Ontario, Canada, with added notes on the distribution, ecology and conservation status of this species in North America. Crustaceana 94 (4): 467-486. DOI 10.1163/15685403-bja10104 

CORREA, N., R. C. GUIASU, and D. BOLTOVSKOY. 2021. Invasion biology: evidence, assumptions, and conservationism. Anales de la Academia Nacional de Ciencias Exactas, Fisicas y Naturales (Argentina). 72: 179-226. 

GUIASU, R. C. and M. LABIB. 2021. The unreliable concept of native range as applied to the distribution of the rusty crayfish (Faxonius rusticus) in North America. Hydrobiologia 848 (6): 1177-1205.  https://doi.org/10.1007/s10750-021-04523-y 

PEREYRA, P. J. and R. C. GUIASU. 2020. Debate over the importance and meaning of native range in invasion biology: reply to Courchamp et al. Conservation Biology 34 (4): 1044-1046. https://doi.org/10.1111/cobi.13529 

GUIASU, R. C. and C. W. TINDALE. 2018. Logical fallacies and invasion biology. Biology & Philosophy 33:34 (volume 33, article no. 34): pp. 1-24. doi.org/10.1007/s10539-018-9644-0 

GUIASU, R. C. and S. GUIASU. 2014. Weighted Gini-Simpson quadratic index of biodiversity for interdependent species. Natural Science 6: 455-466.     PDF

 GUIASU, R. C. and S. GUIASU. 2012. The weighted Gini-Simpson index: revitalizing an old index of biodiversity. International Journal of Ecology. Volume 2012, Article ID 478728, 10 pages, doi:10.1155/2012/478728   Publisher's Site 
 
GUIASU, R. C. and S. GUIASU. 2011. The weighted quadratic index of biodiversity for pairs of species: a generalization of Rao's index. Natural Science 3 (9): 795-801.     PDF
 
GUIASU, R. C. and S. GUIASU. 2010. Diversity measures and coarse-graining in data analysis with an application involving plant species on the Galapagos Islands. Journal of Systemics, Cybernetics and Informatics 8 (5): 54-64.     PDF
 
GUIASU, R. C. and S. GUIASU. 2010. New measures for comparing the species diversity found in two or more habitats. International Journal of Uncertainty, Fuzziness and Knowledge-Based Systems 18 (6): 691-720.     PDF
 
GUIASU, R. C. and S. GUIASU. 2010. The Rich-Gini-Simpson quadratic index of biodiversity. Natural Science 2 (10): 1130-1137.     PDF
 
GUIASU, R. C. 2009. Conservation, status, and diversity of the crayfishes of the genus Cambarus Erichson, 1846 (Decapoda, Cambaridae). Crustaceana 82 (6): 721-742.     PDF
 
GUIASU, R. C. 2007. Conservation and diversity of the crayfishes of the genus Fallicambarus Hobbs, 1969 (Decapoda, Cambaridae), with an emphasis on the status of Fallicambarus fodiens (Cottle, 1863) in Canada. Crustaceana 80 (2): 207-223.     PDF 
 
GUIASU, R. C., N. SALEH, E. MOZEL, and D. W. DUNHAM. 2005. Low aggression in juvenile burrowing crayfish, Fallicambarus fodiens (Cottle, 1863) (Decapoda, Cambaridae). Crustaceana 78 (4): 421-428.     PDF 

GUIASU, R. C. and S. GUIASU. 2003. Conditional and weighted measures of ecological diversity. International Journal of Uncertainty, Fuzziness and Knowledge-Based Systems 11 (3): 283-300.     PDF
 
GUIASU, R. C. and D. W. DUNHAM. 2002. Observations on the timing of moulting events in the crayfish Cambarus robustus Girard, 1852 (Decapoda, Cambaridae). Crustaceana 74 (11): 1365-1378.     PDF
 
PUNZALAN, D., R. C. GUIASU, D. BELCHIOR, and D. W. DUNHAM. 2001. Discrimination of conspecific-built chimneys from human-built ones by the burrowing crayfish Fallicambarus fodiens (Decapoda, Cambaridae). Invertebrate Biology 120 (1): 58-66.     PDF 

GUIASU, R. C. and D. W. DUNHAM. 1999. Aggressive interactions between the crayfishes Cambarus bartonii bartonii and C. robustus (Decapoda, Cambaridae): interspecific and intraspecific contests. Journal of Crustacean Biology 19 (1): 131-146.     PDF 

GUIASU, R. C. and D. W. DUNHAM. 1999. Agonistic contests in male Form I Cambarus bartonii bartonii (Fabricius, 1798) (Decapoda, Cambaridae) crayfish and a comparison with contests of the same type in Cambarus robustus Girard, 1852. Crustaceana 72 (9): 1079-1091.     PDF
 
GUIASU, R. C. and D. W. DUNHAM. 1998. Inter-form agonistic contests in male crayfishes, Cambarus robustus (Decapoda, Cambaridae). Invertebrate Biology 117 (2): 144-154.     PDF
 
GUIASU, S. and R. C. GUIASU. 1998. Comparison between some probabilistic indicators useful in the behavioural classification. International Journal of Mathematical and Statistical Sciences 7 (1): 39-59.     PDF
 
GUIASU, R. C. and R. WINTERBOTTOM. 1998. Yellow juvenile colour pattern, diet switching, and the phylogeny of the surgeonfish genus Zebrasoma (Percomorpha, Acanthuridae). Bulletin of Marine Science 63 (2): 277-294.     PDF
 
GUIASU, R. C. and D. W. DUNHAM. 1997. Initiation and outcome of agonistic contests in male Form I Cambarus robustus Girard 1852 crayfish (Decapoda, Cambaridae). Crustaceana 70 (4): 480-496.     PDF 
 
GUIASU, R. C. and D. W. DUNHAM. 1997. Agonistic interactions in male Form II Cambarus robustus Girard 1852 crayfish (Decapoda, Cambaridae) and a comparison between male Form I and Form II intra-form contests. Crustaceana 70 (6): 720-736.     PDF  

GUIASU, R. C. , D. W. BARR, and D. W. DUNHAM. 1996. Distribution and status of crayfishes of the genera Cambarus and Fallicambarus (Decapoda, Cambaridae) in Ontario, Canada. Journal of Crustacean Biology 16 (2): 373-383.     PDF 

GUIASU, R. C., D. W. DUNHAM, and D. W. BARR. 1996. Interspecific agonistic contests between male Cambarus bartonii bartonii (Fabricius 1798) and Cambarus robustus Girard 1852 (Decapoda, Cambaridae) crayfish and the possible competition between the two species in Ontario, Canada. Freshwater Crayfish 11 (Proceedings of the International Association of Astacology Eleventh Symposium): 364-377.     PDF 

GUIASU, R. C. and R. WINTERBOTTOM. 1993. Osteological evidence for the phylogeny of the recent genera of surgeonfishes (Percomorpha, Acanthuridae). Copeia 1993 (2): 300-312.     PDF

Book Chapters

    •    GUIASU, R. C. and S. GUIASU. 2009. Coarse-graining in data analysis with an application involving plant species on the Galapagos Islands. In: Baralt, J., Callaos, N., Chu, H-W, Lesso, W., and C. D. Zinn (Eds.): Proceedings of the 13th World Multi-Conference on Systemics, Cybernetics and Informatics. Volume III: 111-118. International Institute of Informatics and Systemics, Inc. Orlando, Florida, U.S.A., 292 pages.     PDF
 
     •    GUIASU, R. C. 2002. Cambarus. Chapter 16. pp. 609-634 (+ 2 colour plates). In: Holdich, D. M. (Ed.): Biology of Freshwater Crayfish. Blackwell Science, Ltd., Oxford, UK, 702 pages.     PDF
 
     •    GUIASU, R. C. and D. W. DUNHAM. 1999. Aggression and competition in the surface water Cambarus (Decapoda, Cambaridae) crayfish species of Ontario, Canada: an overview. In: Schram, F. R. and J. C. von Vaupel Klein (Eds.): Crustaceans and the Biodiversity Crisis - Proceedings of the Fourth International Crustacean Congress, Amsterdam, The Netherlands, July 20-24, 1998. Volume 1: 701-717. Brill Academic Publishers, Leiden, The Netherlands, 1021 pages.     PDF
 

Other Publications

GUIASU, R. C. 2008. Specious claims? (Invasive species). ROM - The Magazine of the Royal Ontario Museum 40 (4): 26-33. (Spring 2008 issue - cover story).     PDF
 
GUIASU, R. C. 2002. Tunnel syndrome. Rotunda - The Royal Ontario Museum Magazine 35 (1): 22-27 (Summer/Fall 2002 issue).    
 
GUIASU, R. C. 2015. Dire warning on fire ants overstated. Letter to the Editor. The Toronto Star. Thursday, January 1, 2015.    
 
GUIASU, R. C. 2010. New plants are no threat to biodiversity. Letter to the Editor. The Toronto Star. Thursday, July 22, 2010.    
 
GUIASU, R. C. 2008. Invasive controversy: a reply to Nicholas Mandrak. ROM - The Magazine of the Royal Ontario Museum 41 (1): 6. (Summer 2008 issue).     PDF
 
GUIASU, R. C. 2008. Book review of "A Primer of Conservation Biology" (2008) by Richard Primack. Sinauer Associates, Inc., Sunderland, Massachusetts, U.S.A. The Canadian Field-Naturalist 122 (1): 89-90.    
 
GUIASU, R. C. 2007. Book review of "New Zealand - A Natural History" (2006) by Tui De Roy and Mark Jones. Firefly Books, Canada. The Canadian Field-Naturalist 121 (1): 109-110.    
 
SALEH, N., L. MOZEL, R. C. GUIASU, and D. DUNHAM. 2002. Agonistic interactions in the semi-terrestrial crayfish Fallicambarus fodiens: the dynamics between winners and losers. Integrative and Comparative Biology 42 (6): 1304.    
 
 GUIASU, R. C. and D. W. DUNHAM. 2002. The ecology, behaviour, and conservation of the vulnerable burrowing crayfish Fallicambarus fodiens (Decapoda, Cambaridae). Integrative and Comparative Biology 42 (6): 1238.   

President's University-Wide Teaching Award - York University - 2010 

Principal's Teaching Excellence Award - Glendon College, York University - 2009 

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