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57. Persad, A.B., J. Siefer, , R. Montan, S. Kirby, O.J. Rocha, M.E. Redding, C.M. Ranger, A.W. Jones. 2013. Effects of emerald ash borer infestation on the structure and material properties of ash trees.  Arboriculture and Urban Forestry, 39: 11-16.

 

56. Loáisiga, C.H., O.J. Rocha, A. K. Brantestam, B. Salomon,and Arnulf Merker. 2012. Genetic diversity and gene flow in six accessions of Meso-America teosintes. Genetic Resources and Plant Evolution 59: 95-111

 

55. Brown, J.E., J. M. Bauman, J. F. Lawrie, O.J. Rocha, and R. C. Moore. 2012. The Structure of Morphological and Genetic Diversity in Natural Populations of Carica papaya (Caricaceae) in Costa Rica. Biotropica 44: 179-188.

 

54. Hardesty B.D., J. J. Le Roux, O. J. Rocha, J.Y. Meyer, D. Westcott1 and A. M. Wieczorek. 2011.  Getting there from here – testing the paradigm of invasion success. Diversity and Distributions 18: 147-157.

 

53. Rojas F., O. Murillo, G. Aguilar, O.J. Rocha, and  E. Araya. 2011. Análisis genotípico en Vochysia guatemalensis Donn Smith (Vochysiaceae) mediante microsatellites. Revista Forestal Mesoamericana Kurú (Costa Rica) 8:10-19.

 

52. Hernandez-Ugalde J, J. Mora-Urpi and O.J. Rocha. 2011 Genetic relationships among wild and cultivated populations of peach palm (Bactris gasipaes Kunth, Palmae): evidence for multiple independent domestication events. Genetic Resources and Crop Evolution 58: 571-583.

 

51. Constance E. Hausman, John F. Jaeger, and O.J. Rocha (2010) Impacts of the emerald ash borer (EAB) eradication and tree mortality: potential for a secondary spread of invasive plant species. Biological Invasions 12: 2013-2023.

                    

50. Marco V. Gutiérrez-Soto, L Fallas, N.M. Holbrooke, O.J. Rocha and N. Vazquez. (2010). Pioneer trees of the dry forest:  Phenology, lignotubers, and water relations of Cochlospermum vitifolium (Cochlospermaceae). Biotropica 42: 104-111.

 

49. Leiva JA, Mata R, Rocha OJ, Gutiérrez-Soto MV (2009) Cronología de la regeneración del bosque tropical seco en Santa Rosa, Guanacaste, Costa Rica. I. Características edáficas. Revista de Biología Tropical 57: 801-836.

 

48. Leiva JA, Mata R, Rocha OJ, Gutiérrez-Soto MV (2009) Cronología de la regeneración del bosque tropical seco en Santa Rosa, Guanacaste, Costa Rica. II. La vegetación en relación con el suelo. Revista de Biología Tropical 57: 817-836.

 

47. Daniel Barrantes, Gabriel Macaya, Luigi Guarino, Jean Pierre Baudoin and Oscar J. Rocha. (2008). The impact of local extinction on genetic structure of wild populations of lima beans (Phaseolus lunatus) in the Central Valley of Costa Rica: consequences for the conservation of plant genetic resources. Revista de Biología Tropical 56: 1023-1041.

 

46. Hernandez J.A., O.J. Rocha  and J. Mora Urpí. (2008). Diversidad genética y relaciones de parentesco de las poblaciones silvestres y cultivadas de Pejibaye (Bactris gasipaes Kunth, Palmae), utilizando marcadores microsatélites. Revista de Biología Tropical 56: 217-245.

 

45. Oscar J. Rocha, Maria E. Zaldivar, Luis Castro, Emilio Castro, and Ramiro Barrantes.  2008. Microsatellite variation of cassava (Manihot esculenta Crantz) in home gardens of Chibchan Amerindians from Costa Rica. Conservation Genetics 9: 107 – 118.

 

44. Abdelnour, A., and Oscar J. Rocha.  2008. Genetic characterization of a collection of chayote (Sechium edule Jacq. SW) in Costa Rica using isozyme markers. Genetic Resources and Crop Evolution 55: 163-170.

 

43. Peters M.B., C. Hagen, D.W. Trapnell, J.L. Hamrick, O. Rocha , P.E. Smouse, and T. C. Glenn.  2008.  Isolation and characterization of microsatellite loci in the Guanacaste tree, Enerolobium cyclocarpum. Molecular Ecology Notes 8: 129-131.

 

42. Baudoin, J.P., O. J. Rocha, J. Degreef, A. Maquet, and L. Guarino.  2007. In situ conservation strategy for wild Lima bean (Phaseolus lunatus L.) in the Central Valley of Costa Rica: a case study of short-lived perennial plants with a mixed mating system. In: N. Maxted, B.V. Ford Lloyd, S.P. Kell, J. Iriondo and E. Dulloo (eds), Crop Wild Relative Conservation and Use. CABI Internacional Press, pp. 364-379.

 

41. Oscar J. Rocha, Braulio Vílchez and Ana Araya.   2006.  A mast fruiting episode of Peltogyne purpurea in the Osa Peninsula, Costa Rica. Revista de Biología Tropical.  54: 1151-1155.

 

40. Vílchez,  B. and Oscar J. Rocha.  2006.  Estudio de una población de Peltogyne purpurea Pittier en un bosque intervenido de la Península de Osa, Costa Rica. Revista de Biología Tropical. 54: 1019-1029.

 

39. Araya, E. O. Murillo, G. Aguilar and O. Rocha. 2006. Relaciones genéticas en una colección de clones de Gmelina arborea reveladas con marcadores AFLP Kurú: Revista Forestal 3 (1): 1-8.

 

38. Araya E, O. Murillo, G. Aguilar, O. Rocha, S. Woolbright and P. Keim. 2005. Possibilities of breeding teak (Tectona grandis L.f) in Costa Rica by AFLP markers. Kurú: Revista Forestal 2 (5): 1-8.

 

37. Mena Alí, J.I. and O.J. Rocha. 2005.  Selective seed abortion affects the performance of the offspring in Bauhinia ungulata (Fabaceae). Annals of Botany 95: 1017-1023.

 

36. Mena Alí, J.I. and O.J. Rocha. 2005.  Effect of ovule position within the pod on the probability of seed production in Bauhinia ungulata (Fabaceae). Annals of Botany 95: 449-455.

 

35. M. E. Zaldivar, O. Rocha, K. E. Glander, G. Aguilar, A. S. Huertas, G. A. Gutierrez-33. Espeleta, R. Sanchez and G. Wong.  2004.  Distribution, ecology, life history, genetic variation, and risk of extinction of nonhuman primates from Costa Rica. Revista de Biología Tropical 52: 679-693.

 

34. Baudoin, J.P., O. J. Rocha, J. Degreef, A. Maquet, and L. Guarino. 2004. Ecogeography, demography diversity and conservation of Phaseolus lunatus L. in the Central Valley of Costa Rica. Systematic and Ecogeographic studies on crop gene pools 12. International Plant Genetic Resources Institute, Rome, Italy.

 

33. María Eugenia Zaldivar, Oscar J. Rocha, Gabriel Aguilar, Luis Castro, Emilio Castro, and Ramiro Barrantes. 2004. Genetic variation of cassava (Manihot esculenta) cultivated by Chibchan Amerindians from Costa Rica. Economic Botany 58 (2): 204-215.

 

32. Vílchez, B, O.J. Rocha.  2004. Fenología y biología reproductiva del nazareno (Peltogyne purpurea Pittier) en un bosque intervenido de la Peninsula de Osa, Costa Rica, América Central. Kurú: Revista Forestal 1(1): 1-14.

 

31. Lara A. R. Valverde, O. Rocha and L. Gómez.  2003.  Variabilidad y diferenciación genética en cuatro poblaciones de la planta medicinal Psychotria acuminata en Costa Rica. Agronomía Costarricense 27: 29-42.

 

30. Vargas E.M., E.  Castro, G. Macaya and O. J. Rocha.  2003  Variación del tamaño de frutos y  semillas en 38 poblaciones silvestres de Phaseolus lunatus L. del Valle Central de Costa Rica. Revista de Biología Tropical 51: 707-724.

 

29. Zaldivar, M.E., K.E. Glander, O. J. Rocha, G. Aguilar, E. Vargas, G.A. Gutierrez Espeleta and R. Sanchez.  2003.  Genetic variation of mantled howler monkeys (Alouatta palliata) from Costa Rica.  Biotropica 35: 375-381.

 

28. Cespedes, M., M.V. Gutierrez, N. Holbrooke and O.J. Rocha.  2003. Restoration of genetic diversity in the dry forest tree Swietenia macrophylla (Meliaceae) after pasture abandonment in Costa Rica.  Molecular Ecology 12: 3210-3212.

 

27. M.J. Perich, O. J. Rocha, N.L. Castro, A.W. Alfaro, K.B. Platt, T. Solano and W.A. Rowley. 2003.  Evaluation of the Efficacy of Lambda-Cyhalothrin Applied by Three Spray Application Methods for Emergency Control of Aedes aegypti in Costa Rica. Journal of the American Mosquito Control Association. 19 (1): 58-62.

 

26. O.J. Rocha.  2003.  Breeding systems, gene flow and levels of genetic differentiation in plant populations. Lankesteriana 7: 81-86.

 

25. Zaldivar, M.E., O.J. Rocha, E Castro and R. Barrantes.  2002.  Species diversity of plants grown in gardens of Chibchan Amerindians from Costa Rica. Human Ecology 30: 301-316.

 

24. Degreef, J, O.J. Rocha, T. Vanderborght and J.P. Baudoin.  2002.  Soil seed bank and seed dormancy in wild populations of Lima Beans (Phaseolus lunatus): considerations for ex situ and in situ conservation.  American Journal of Botany 89: 1644-1650.

 

23. Rocha, O.J., J. Degreff, D. Barrantes, E. Castro, G. Macaya. 2002. Metapopulation dynamics of lima beans (Phaseolus lunatus) in the Central Valley of Costa Rica. In: J.M.M. Engels, A.H.D. Brown, and M.T. Jackson (Eds.), Managing Plant Genetic Resources. CABI International, UK.

 

22. Meurrens, F., J. Degreef, O.J. Rocha and J.P Baudoin.  2001.  Demographic studies in micro-conservation sites with a view to maintain in situ wild Lima beans (Phaseolus lunatus) in the Central Valley of Costa Rica. Plant Genetic Resources Newsletter 128: 45-50.

 

21. Hood, M.E., O.J. Rocha and J. Antonovics.  2001.  Differences in teliospore germination patterns of Microbotryum violaceous from European and North American Silene species. Mycological Research 105: 532-536.

 

20. Rocha O.J. and G. Aguilar. 2001. Reproductive biology of the dry forest tree Enterolobium cyclocarpum Jacq. (Guanacaste) in Costa Rica. 2001. The American Journal of Botany 88: 1607-1614.

 

19. Rocha O.J. and G. Aguilar. 2001. Variation in the breeding behavior of the dry forest tree Enterolobium cyclocarpum Jacq. (Guanacaste) in Costa Rica: a comparison between trees left in pastures and trees in continuous forest. 2001. The American Journal of Botany 88: 1600-1606.

 

18. Vargas, E.M., G. Macaya, J.P. Baudoin and O.J. Rocha. 2001.  Case studies in breeding systems and its consequences for germplam conservation: Electrophoretic mobility of phaseolins in wild populations of lima beans (Phaseolus lunatus) in the Central Valley of Costa Rica. Genetic Resources and Crop Evolution 48: 109-120.

 

17. Platt, K.B., J.A. Mangiafico, O.J. Rocha, M.E. Zaldivar, J. Mora, G. Trueba and W.A. Rowley.  2000. Detection of dengue virus neutralization antibodies in bats from Costa Rica and Ecuador. Journal of Medical Entomology 37: 965-967.

 

16. Rocha, O.J. 2000. La Biología: una vocación centenaria. Memorias de la Academia Nacional de Ciencias. 5 (3): 3-19.

 

15. Vargas, E.M., G. Macaya, J.P. Baudoin and O.J. Rocha. 2000 . Variation in the content of phaseolin in 37 wild populations of of lima beans (Phaseolus lunatus) in the Central Valley of Costa Rica. Genetic Resources Newsletter 121: 53-58.

 

14. Murillo, O and O.J. Rocha. 1999.  Gene flow and geographical variation in natural populations of Alnus acuminata spp. Arguta (Belutaceae, Fagales) in Costa Rica and Panama. Revista de Biología Tropical 47: 739 – 753.

 

13. Rocha, O.J. and J.A. Lobo.  1998. Genetic diversity and outcrossing rates in the Guanacaste tree (Enterolobium cyclocarpum Jacq.) in the dry forest of Costa Rica. In: S. Bruns, S. Mantell, C. Tragardh and A.M. Viana “Recent advances in biotechnology for trees conservation and management” International Foundation for Science. Sweden. Pp. 65 – 81.

 

12. Rocha, O.J., G. Macaya and J.P. Baudoin. 1997  Causes of local extinctions and recolonization, determined by 3 years of  monitoring wild populations of Phaseolus lunatus L. in the Central valley of Costa Rica. Genetic Resources  Newsletter 112: 44 – 48.

 

11. Degreef, J, J.P. Baudoin and O.J. Rocha.  1997.  Case studies on breeding systems and its consequences for germplasm conservation. 2. Demography of wild Lima beans in the Central Valley of Costa Rica. Genetic Resources and Crop Evolution 44: 429 – 438.

 

10. Maquet, A., Zoro Bi Irie, O.J. Rocha and J.P. Baudoin  1996  Case studies on breeding systems and its consequences for germplasm conservation. 1. Isozyme diversity in wild lima bean population in central Costa Rica. Genetic Resources and Crop Evolution 43:309 - 318.

 

9. Rocha, O.J.  1996 The effects of achene dimorphism on disperal in Bidens pilosa L. International Journal of Plant Sciences 157 (3): 316 – 322.          

 

8. Rocha, O.J. and Lobo 1996.  Genetic variation and differentiation among five populations of the Guanacaste tree (Enterolobium cyclocrapum) in Costa Rica. International Journal of Plant Sciences 157 (2): 234 – 239.

 

7. Rocha, O.J. and A.G. Stephenson  1995.  Regulation of flower, fruit, and seed production:  Phaseolus coccineus a study case. In: P.C. Hoch and A.G.Stephenson (Eds), Experimental and Molecular Approaches to plant biosystematics. Monograph in Systematic Botany from the Missouri Botanical Gardens. Vol 53.

 

6. Rocha, O.J. and A.G. Stephenson  1991  Order of fertilization within the ovary of Phaseolus coccineus L.  Sexual Plant Reproduction 4: 126-131.

 

5. Rocha, O.J. and A.G. Stephenson  1991  Effects of  nonrandom seed abortion on progeny performance in Phaseolus coccineus L.  Evolution 45: 1198-1208.

 

4. Rocha, O.J. and A.G. Stephenson  1990  Effects of ovule position on seed production, seed weight, and progeny performance in Phaseolus coccineus L. American Journal of Botany 77: 1320-1329.

 

3. Rocha, O.J.  1990. The effects of nonrandom seed abortion on progeny vigor in Phaseolus coccineus L. (Leguminosae). Ph.D. Thesis, The Pennsylvania State University, Pennsylvania, U.S.A.

 

2. Rocha, O.J.  1988. Population Dynamics of Bidens pilosa L. Splits, Germany.

 

1. López, M.R, O.J. Rocha and L.A. Fournier. 1984.  Producción de mantillo en una comunidad natural y una de ciprés en el bosque de montano bajo muy húmedo. Rio La Hoja, Heredia, Costa Rica. Turrialba 34: 19-25.