James J. Roper, PhD

Tropical Ecology & Ornithology
Forest Ecology & Animal Behaviour Working Group

Centro Universitário de Vila Velha
Laboratório de Ecologia e Conservação da Biodiversidade – LECB

Universidade Federal do Paraná
Programa de Pos-graduação em Ecologia e Conservação

E-mail: jroper@tropicalcc.org
Tele: 55 41 36730409
Celular: 55 41 98182559
Skype: jjroper


PhD, Ecology & Evolution
University of Pennsylvania
MSc, Zoology
Arizona State University
BSc, Zoology
Oklahoma State University

Research Interests
I am interested in a broad variety of ecological and evolutionary questions, especially those having to do with how reproductive strategies influence population dynamics. Most of my research includes analysis of reproductive success and survival and can include any species of terrestrial vertebrates.

I am also interested in how we go about answering ecological and evolutionary questions, both theoretically and pragmatically. I have been teaching biostatistics here in Brazil since 1998. Statistical tools provide a variety of ways to answer as well as ask interesting questions.

Given these interests, the interface between these areas and conservation biology is also important. One of several areas that intrigues me now is how we can understand population dynamics of rare species (as many endangered species are!) given the problem of small sample sizes (and associated issues). Also, today, introduced species are cause problems worldwide and we need to better understand population dynamics to anticipate the future consequences of this growing problem.

Teaching Experience
Field ecology and conservation (Venezuela, Panama, Brazil, Peru, Costa Rica); Ecology (general, tropical, advanced); Biostatistics; Ornithology; Animal Behaviour

Recent Research Contributions

Lima, A. M. X., & Roper, J. J. 2013. Early singing onset in the black-cheeked gnateater (Conopophaga melanops). Revista Brasileira de Ornitologia, 21: 5–9.

Coradello, M. A., Morais, R. N., Roper, J. J., Spercoski, K. M., Massuda, T., Nogueira, S. S. C., & Nogueira-Filho, S. L. G. 2012. Validation of a fecal glucocorticoid metabolite assay for collared peccaries (Pecari tajacu). Journal of Zoo and Wildlife Medicine, 43: 275–282. doi:10.1638/2011-0046.1

Marini, M. Â., Borges, F. J. A., Lopes, L. E., Sousa, N. O. M., Gressler, D. T., Santos, L. R., Roper, J. J. 2012. Breeding biology of birds in the cerrado of central Brazil. Ornitologia Neotropical, 23:385–405.

Hiert, C., Roper, J. J., & Moura, M. O. 2012. Constant breeding and low survival rates in the subtropical Striped Frog in southern Brazil. Journal of Zoology, doi:10.1111/j.1469-7998.2012.00938.x

Niedfeld, M.R. and Roper, J. J. 2011. An Experimental Test of the Benefits of Hatching Asynchrony in the Rufous Hornero (Furnarius rufus). Revista Brasileira de Ornitologia 19:1-5.

Carmen, M. R., Bullard, S. G., Rocha, R. M., Lambert, G., Dijkstra, J. A., Roper, J. J., Goodwin, A., Caremn, M. M. and Vail, E. M. 2011. Ascidians at the Pacific and Atlantic entrances to the Panama Canal. Aquatic Invasions 6 (doi: 10.3391/ai.2011.6.4)

Kremer, L. P., Rocha, R. M. and Roper, J. J. 2010. An experimental test of colonization ability in the potentially invasive Didemnum perlucidum. Biological Invasions 12:1581 (doi: 10.1007/s10530-009-9571-8).

Roper, J, J., Sullivan, K. A., Ricklefs, R. E. 2010. Avoid nest predation when predation rates are low, and other lessons: testing the tropical-temperate nest predation paradigm. Oikos 119: 719–729.

Kremer, L., Rocha, R. and Roper, J. J. 2010. An experimental test of colonization ability in the potentially invasive Didemnum perlucidum (Tunicata, Ascidiacea). Biol Invasions 12:1581–1590

Lima, A. M. X. and Roper, J. J. 2009. Population dynamics of the black-cheeked gnateater (Conopophaga melanops, Conopophagidae) in southern Brazil. Journal of Tropical Ecology 25:605–613.

Lima, A. M. X. and Roper, J. J. 2009. The use of playbacks can influence encounters with birds: an experiment. Revista Brasileira de Ornitologia, 17:37-40.

Ritzmann, N. F., Rocha, R. M. and Roper, J. J. 2009. Sexual and asexual reproduction in Didemnum rodriguesi (Ascidiacea, Didemnidae). Iheringia 99:106-110

Cardoso, M.Z., Roper, J. J., Gilbert, L.E. 2009. Prenuptial agreements: mating frequency predicts gift-giving in Heliconius species. Entomologia Experimentalis et Applicata 131:109-114 doi:10.1111/j.1570-7458.2009.00837.x

Pichorim, M., Roper, J. J. and Monteiro Filho, E. L. de A. 2009. Experimental Study of Nest-site Selection in the Biscutate Swift (Streptoprocne biscutata, Aves: Apodidae) in Southern Brazil. doi:10.1111/j.1744-7429.2008.00457.

Rafael, M. S., Hereira-Rojas, W. J., Roper, J. J., Nunomura, S.M. and Tadei, W.P. 2008. Potential control of Aedes aegypti (Diptera: Culicidae) with Piper aduncum L. (Piperaceae) extracts demonstrated by chromosomal biomarkers and toxic effects on interphase nuclei. Genetics and Molecular Research, 7:772-781

Popp, L. G., Serafini, P. P., Reghelin, A. L., Spercoski, K. P., Roper, J. J. and Morais, R. N. 2008. Annual pattern of fecal corticoid excretion in captive Red-Tailed parrots (Amazona brasiliensis). Journal of Comparative Physiology – B. DOI 10.1007/s00360-007-0241-9

Tolentino, K. Roper, J. J., Passos, F. C. and Strier, K. B. 2008. Mother-offspring associations in Northern muriquis, Brachyteles hypoxanthus. American Journal of Primatology. 70:301–305

Neves, C. S., Rocha, R. M., Roper, J. J. 2007. Artificial substrate use by introduced and cryptogenic marine species in Paranaguá Bay, southern Brazil. Biofouling:319-330.

Machado, R. A. ; Roper, J. J. 2007. Agalychnis callidryas Reproduction. Herpetological Review. 38: 177

Roper, J. J. 2006. What does “Wildlife Management” mean for Brazil?. Natureza e Conservação, Brazil, 4:107-116.

Roper, J. J. 2005. Dicas para escrever em inglês – Do’s and Don’t’s. Ararajuba: Revista Brasileira de Ornitologia, São Leopoldo, RS, v. 13, n. 2, p. 193-196.
Sari, L. T. Ribeiro-Costa, C. S. Roper, J. J. 2005. Dinâmica populacional de bruquíneos (Coleóptera, Chrysomelidae) em Senna multijuga (Rich.)H. S. Irwin & Barneby (Caesalpinaceae). Revista Brasileira de Zoologia 22: 169-174.

Roper, J. J. 2005. Sexually Distinct Songs in the Duet of the Sexually Monomorphic Rufous Hornero (Furnarius rufus). Journal of Field Ornithology, 76:235-237.

Torres, R. A., Roper, J. J., Foresti, F., Oliveira, C. 2005. Surprising genomic diversity in the Neotropical fish Synbranchus marmoratus (Teleosti, Synbranchidae): how many species?. Neotropical Ichthyology, 3:127-134.

Roper, J. J. 2005. Try and try again: Nest Predation Favors Persistence in a Tropical Bird. Ornitología Neotropical 16:253-262.

Lima, A. M. X., Roper, J. J. 2004. Aves de remanescentes florestais em áreas urbanas: ferramentas para a conservação. Anais do IV Congresso Brasileiro de Unidades de Conservação, Curitiba, p. 17-21.

Roper, J. J. 2003. Biased sex ratio or biased analysis?. Natureza & Conservação, 1:63-65.

Roper, J. J. 2003. Nest-sites influence predation differently at natural and experimental nests. Ornitología Neotropical, 14:1-14.

Martin, T. E., Roper, J. J. 1988. Nest Predation And Nest-Site Selection In A Western Population of the Hermit Thrush. Condor 90:51-57