Dr. Nicolás R. Ehemann
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My research focus primarily revolves around the taxonomy, systematics, biogeography, and evolution of fish, with a particular emphasis on elasmobranchs. During my postdoctoral tenure at the renowned Meyer Lab, I aim to expand my expertise in elucidating the genetic determinants underlying morphological and meristic traits crucial for fish identification and taxonomic classification. These traits encompass structures like the number of vertebrae and lateral line scales. Additionally, I am deeply intrigued by the fascinating subject of sympatric speciation in cichlids, particularly in Central American cichlids. I am confident that my research thrives in its synergy with the esteemed Professor Axel Meyer and the Meyer Lab team, and I am enthusiastic about the professional growth and learning opportunities this collaboration offers.
Education:
Awards and Grants:
Publications:
27. Ehemann, N.R., Meyer A. & Hulsey, C.D. (2024). Morphological description of spontaneous pelvic fin loss in a neotropical cichlid fish. Journal of Morphology. https://doi.org/10.1002/jmor.21663
26. *Ehemann, N.R. & Zambrano-Vizquel, L.A. (2024). Echinorhinus brucus (Bonnaterre, 1788) in the Caribbean Sea: A recurrent visitor, or are the artisanal fisheries exploiting deeper waters?. Journal of Fish Biology, DOI: https://doi.org/10.1111/jfb.15594
25. Enríquez-García, A.B., Cruz-Escalona, V.H., Carriquiry, J.D., Ehemann, N.R., Mejía-Falla, P.A., Marín-Enríquez, E., Treinen-Crespo, C., Vélez-Tacuri, J.R. & Navia, A.F. (2023), Trophic assessment of three sympatric batoid species in the Southern Gulf of California. PeerJ 11: e16117
24. *Ehemann N., Acosta-Rodríguez E., Tagliafico, A., Pelletier, N, & Stevens, G. (2022). Manta and devil ray species occurrence and distribution in Venezuela, assessed through fishery landings and citizen science data. Journal of Fish Biology, 101(1), 213-225. doi: 10.1111/jfb.15088
23. Becerril-García, E.E., Arauz, R., Arellano-Martínez, M., Bonfil, R., Ayala-Bocos, A., Castillo-Geniz, J.L., … Ehemann, N.R., et al. (2022). Research priorities for the conservation of Chondrichthyans in Latin America. Biological Conservation, 269, Article 109535. doi: 10.1016/j.biocon.2022.109535
22. Ehemann, N.R., García-Rodríguez, F.J. & Cruz-Agüero, J.D.L. (2022). Urotrygon rogersi (Myliobatiformes: Urotrygonidae) from the subtropical, provides new biological, genetic, taxonomic, and distribution data for the genus Urotrygon. Regional Studies in Marine Science, 51 Article 102175. Doi: 10.1016/j.rsma.2022.102175
21. Ehemann, N.R., García-Rodríguez, F.J. & Cruz-Agüero, J.D.L. (2022). Morphological abnormalities in seven American round ray specimens: A review of America's batomorph anomalies. Journal of Fish Diseases, 45(3), 395– 409. doi: 10.1111/jfd.13567
20. González-González, L.V., Mejía-Falla, P.A., Navia, A.F., De La Cruz-Agüero, G., Ehemann, N.R., Peterson, M.S. & Cruz-Escalona, V.H. (2021). The Espiritu Santo Island as a critical area for conserving batoid assemblage species within the Gulf of California. Environmental Biology of Fishes, 104, 1359-1379. DOI: 10.1007/s10641-021-01165-w.
19. Tagliafico, A., Rangel, M.S., Ehemann, N.R., Rago, N.E. & Broadhurst M.K. (2021). Reproductive aspects of seven threatened shark species captured by artisanal fisheries in the southern Caribbean Sea. Regional Studies in Marine Science, 42 Article 101646. DOI: 10.1016/j.rsma.2021.101646.
18. Ehemann N.R., García-Rodríguez, F.J., Pequeño G., Thiel, R. & De La Cruz-Agüero, J. (2021). Historical records of the blotched stingray Urotrygon chilensis (Urotrygonidae: Myliobatiformes) yield insight into species distribution: the importance of natural history collections to questions of zoogeography, Systematics and Biodiversity, 19(3), 252-260. DOI: 10.1080/14772000.2020.1868607.
17. González-González, L.V., Cruz-Escalona, V.H., Ehemann, N.R., De La Cruz-Agüero, G, Abitia-Cárdenas, L.A., Mejía-Falla, P.A. & Navia, A.F. (2020). Riqueza y abundancia relativa de los batoideos de la pesquería artesanal en el archipiélago Espíritu Santo, BCS, México. Hidrobiológica, 30(1):37-47. DOI: 10.24275/uam/izt/dcbs/hidro/2020v30n1/Gonzalez
16. *Ehemann N.R. (2020). Two Caranx caninus (Carangidae, Perciformes) specimens with pug-headed, exophthalmos, opercle, and anal fin abnormalities. First record for the Eastern Pacific. CICIMAR Oceánides. 35 (1,2): 71-82. Doi: 10.37543/oceanides.v35i1-2.262.
15. González-González L.D.V. & Ehemann N.R.* (2019). Length-weight relationships of six elasmobranch species captured at the artisanal fishery of Margarita Island, Venezuela. Journal of Applied Ichthyology, 35(2), 594-596. DOI: 10.1111/jai.13832.
14. Ehemann N.R., Abitia Cardenas L.A., Navia A.F., Mejía-Falla P.A. & Cruz-Escalona V.H. (2019). Zeros as a result in diet studies, is this really bad? Rhinoptera steindachneri as a case study. Journal of the Marine Biological Association of the United Kingdom, 99(7), 1661-1666. DOI: 10.1017/S0025315419000511.
13. *Ehemann, N., González-González L.V., Tagliafico A. & Weigmann S. (2019). Updated taxonomic list and conservation status of chondrichthyans from the exclusive economic zone of Venezuela, with first generic and specific records. Journal of Fish Biology, 95(3), 753-771. doi: 10.1111/jfb.14061
12. Ehemann, N., González-González L.V., Chollet-Villalpando J. & De La Cruz-Agüero J. (2018). Updated checklist of the extant Chondrichthyes within the Exclusive Economic Zone of Mexico. Zookeys, 774, 17-39. doi: 10.3897/zookeys.774.25028.
11. *Ehemann, N. & González-González L.V. (2018). First record of a single-clasper specimen of Pseudobatos percellens (Elasmobranchii: Rhinopristiformes: Rhinobatidae) from the Caribbean Sea, Venezuela. Acta Icthyologica et Piscatoria, 48(3), 235-240. DOI: 10.3750/AIEP/02341.
10. *Ehemann, N., Pérez-Palafox, X., Mora-Zamacona, P., Burgos-Vázquez, M., Navia, A., Mejía-Falla, P. & Cruz-Escalona, V. (2017). Size-weight relationships of batoids captured by artisanal fishery of southern Gulf of California, Mexico. Journal of Applied Ichthyology, 33(5), 1051-1054. doi: 10.1111/jai.13421.
09. *Ehemann, N., Pérez-Palafox, X., Pabón-Aldana, K., Mejía-Falla, P., Navia, A. & Cruz-Escalona, V. (2017). Biological notes on the Reef Stingray, Urobatis concentricus, an endemic species of México. Journal of Fish Biology, 91(4), 1228-1235. DOI: 10.1111/jfb.13398.
08. *Ehemann, N. (2017). A new western Atlantic size record for Pterois volitans (Actinopterygii: Scorpaeniformes: Scorpaenidae) with new morphological data on head spinules. Acta Ichthyologica et Piscatoria. 47 (3) 297-301. DOI: 10.3750/AIEP/02149
07. *Ehemann, N., González-González, L. & Trites, A. (2017). Lesser devil rays Mobula cf. hypostoma from Venezuela are almost twice their previously reported maximum size and may be a new sub-species. Journal of Fish Biology, 90(3), 1142-1148. DOI
06. Nirchio, M., Oliveira, C., Siccha-Ramirez, R., Sene, V., Sánchez-Romero, O., Ehemann, N., Milana, V., Rossi, A. & Sola, L. (2016). Cryptic Caribbean species Scorpaena (Actinopterigii: Scorpaeniformes) suggested by cytogenetic and molecular data. Journal of Fish Biology, 90(4), 1947-1957. DOI: 10.1111/jfb.13089
05. Tagliafico, A., Ehemann, N., Rangel, M. & Rago, N. (2016). Exploitation and reproduction of the bullnose ray (Myliobatis freminvillei) caught in an artisanal fishery in La Pared, Margarita Island, Venezuela. Fishery Bulletin, 114(2), 144-152. DOI: 10.7755/FB.114.2.2
04. *Ehemann, N., Marín-Sanz, J. & Barany-González, M. (2016). Two cases of two-head shark embryos, smalleye smooth-hound Mustelus higmani and the blue shark Prionace glauca. Boletín de Investigaciones Marinas y Costeras, 45(1), 149-153. DOI: 10.25268/bimc.invemar.2016.45.1.636
03. *Ehemann, N., Rigio, P. & Cedeño-Posso, C. (2015). Macro-medusas (Cnidaria: Cubozoa, Hydrozoa y Scyphozoa) observadas en las costas del estado Nueva Esparta, Venezuela. Boletín del Instituto Oceanográfico de Venezuela, 54(2), 185-190
02. *Ehemann, N., González-González, L. & Jiménez, I. (2015). Ictiofauna de los embalses y lagunas dulceacuícolas de la Isla de Margarita, Nueva Esparta, Venezuela. Boletín del Instituto Oceanográfico de Venezuela, 54(1), 71-75.
01. Nirchio, M., Ehemann, N., Siccha-Ramirez, R., Ron, E., Pérez, J., Rossi, A. & Oliveira C. (2014). Karyotype of the invasive species Pterois volitans (Scorpaeniformes: Scorpaenidae) from Margarita Island, Venezuela. Revista de Biología Tropical. https://doi.org/10.15517/rbt.v62i4.13029
- PhD in Marine Sciences - Centro Interdisciplinario de Ciencias Marinas del Instituto Politécnico Nacional, Mexico.
Master's Degree in Marine Resources Management Centro Interdisciplinario de Ciencias Marinas del Instituto Politécnico Nacional, Mexico.
Bachelor's degree in Marine Biology from Universidad de Oriente, Venezuela.
Awards and Grants:
- Awarded the Lázaro Cárdenas Award from the Instituto Politécnico Nacional of Mexico in the Multidisciplinary topic PhD level.
Publications:
27. Ehemann, N.R., Meyer A. & Hulsey, C.D. (2024). Morphological description of spontaneous pelvic fin loss in a neotropical cichlid fish. Journal of Morphology. https://doi.org/10.1002/jmor.21663
26. *Ehemann, N.R. & Zambrano-Vizquel, L.A. (2024). Echinorhinus brucus (Bonnaterre, 1788) in the Caribbean Sea: A recurrent visitor, or are the artisanal fisheries exploiting deeper waters?. Journal of Fish Biology, DOI: https://doi.org/10.1111/jfb.15594
25. Enríquez-García, A.B., Cruz-Escalona, V.H., Carriquiry, J.D., Ehemann, N.R., Mejía-Falla, P.A., Marín-Enríquez, E., Treinen-Crespo, C., Vélez-Tacuri, J.R. & Navia, A.F. (2023), Trophic assessment of three sympatric batoid species in the Southern Gulf of California. PeerJ 11: e16117
24. *Ehemann N., Acosta-Rodríguez E., Tagliafico, A., Pelletier, N, & Stevens, G. (2022). Manta and devil ray species occurrence and distribution in Venezuela, assessed through fishery landings and citizen science data. Journal of Fish Biology, 101(1), 213-225. doi: 10.1111/jfb.15088
23. Becerril-García, E.E., Arauz, R., Arellano-Martínez, M., Bonfil, R., Ayala-Bocos, A., Castillo-Geniz, J.L., … Ehemann, N.R., et al. (2022). Research priorities for the conservation of Chondrichthyans in Latin America. Biological Conservation, 269, Article 109535. doi: 10.1016/j.biocon.2022.109535
22. Ehemann, N.R., García-Rodríguez, F.J. & Cruz-Agüero, J.D.L. (2022). Urotrygon rogersi (Myliobatiformes: Urotrygonidae) from the subtropical, provides new biological, genetic, taxonomic, and distribution data for the genus Urotrygon. Regional Studies in Marine Science, 51 Article 102175. Doi: 10.1016/j.rsma.2022.102175
21. Ehemann, N.R., García-Rodríguez, F.J. & Cruz-Agüero, J.D.L. (2022). Morphological abnormalities in seven American round ray specimens: A review of America's batomorph anomalies. Journal of Fish Diseases, 45(3), 395– 409. doi: 10.1111/jfd.13567
20. González-González, L.V., Mejía-Falla, P.A., Navia, A.F., De La Cruz-Agüero, G., Ehemann, N.R., Peterson, M.S. & Cruz-Escalona, V.H. (2021). The Espiritu Santo Island as a critical area for conserving batoid assemblage species within the Gulf of California. Environmental Biology of Fishes, 104, 1359-1379. DOI: 10.1007/s10641-021-01165-w.
19. Tagliafico, A., Rangel, M.S., Ehemann, N.R., Rago, N.E. & Broadhurst M.K. (2021). Reproductive aspects of seven threatened shark species captured by artisanal fisheries in the southern Caribbean Sea. Regional Studies in Marine Science, 42 Article 101646. DOI: 10.1016/j.rsma.2021.101646.
18. Ehemann N.R., García-Rodríguez, F.J., Pequeño G., Thiel, R. & De La Cruz-Agüero, J. (2021). Historical records of the blotched stingray Urotrygon chilensis (Urotrygonidae: Myliobatiformes) yield insight into species distribution: the importance of natural history collections to questions of zoogeography, Systematics and Biodiversity, 19(3), 252-260. DOI: 10.1080/14772000.2020.1868607.
17. González-González, L.V., Cruz-Escalona, V.H., Ehemann, N.R., De La Cruz-Agüero, G, Abitia-Cárdenas, L.A., Mejía-Falla, P.A. & Navia, A.F. (2020). Riqueza y abundancia relativa de los batoideos de la pesquería artesanal en el archipiélago Espíritu Santo, BCS, México. Hidrobiológica, 30(1):37-47. DOI: 10.24275/uam/izt/dcbs/hidro/2020v30n1/Gonzalez
16. *Ehemann N.R. (2020). Two Caranx caninus (Carangidae, Perciformes) specimens with pug-headed, exophthalmos, opercle, and anal fin abnormalities. First record for the Eastern Pacific. CICIMAR Oceánides. 35 (1,2): 71-82. Doi: 10.37543/oceanides.v35i1-2.262.
15. González-González L.D.V. & Ehemann N.R.* (2019). Length-weight relationships of six elasmobranch species captured at the artisanal fishery of Margarita Island, Venezuela. Journal of Applied Ichthyology, 35(2), 594-596. DOI: 10.1111/jai.13832.
14. Ehemann N.R., Abitia Cardenas L.A., Navia A.F., Mejía-Falla P.A. & Cruz-Escalona V.H. (2019). Zeros as a result in diet studies, is this really bad? Rhinoptera steindachneri as a case study. Journal of the Marine Biological Association of the United Kingdom, 99(7), 1661-1666. DOI: 10.1017/S0025315419000511.
13. *Ehemann, N., González-González L.V., Tagliafico A. & Weigmann S. (2019). Updated taxonomic list and conservation status of chondrichthyans from the exclusive economic zone of Venezuela, with first generic and specific records. Journal of Fish Biology, 95(3), 753-771. doi: 10.1111/jfb.14061
12. Ehemann, N., González-González L.V., Chollet-Villalpando J. & De La Cruz-Agüero J. (2018). Updated checklist of the extant Chondrichthyes within the Exclusive Economic Zone of Mexico. Zookeys, 774, 17-39. doi: 10.3897/zookeys.774.25028.
11. *Ehemann, N. & González-González L.V. (2018). First record of a single-clasper specimen of Pseudobatos percellens (Elasmobranchii: Rhinopristiformes: Rhinobatidae) from the Caribbean Sea, Venezuela. Acta Icthyologica et Piscatoria, 48(3), 235-240. DOI: 10.3750/AIEP/02341.
10. *Ehemann, N., Pérez-Palafox, X., Mora-Zamacona, P., Burgos-Vázquez, M., Navia, A., Mejía-Falla, P. & Cruz-Escalona, V. (2017). Size-weight relationships of batoids captured by artisanal fishery of southern Gulf of California, Mexico. Journal of Applied Ichthyology, 33(5), 1051-1054. doi: 10.1111/jai.13421.
09. *Ehemann, N., Pérez-Palafox, X., Pabón-Aldana, K., Mejía-Falla, P., Navia, A. & Cruz-Escalona, V. (2017). Biological notes on the Reef Stingray, Urobatis concentricus, an endemic species of México. Journal of Fish Biology, 91(4), 1228-1235. DOI: 10.1111/jfb.13398.
08. *Ehemann, N. (2017). A new western Atlantic size record for Pterois volitans (Actinopterygii: Scorpaeniformes: Scorpaenidae) with new morphological data on head spinules. Acta Ichthyologica et Piscatoria. 47 (3) 297-301. DOI: 10.3750/AIEP/02149
07. *Ehemann, N., González-González, L. & Trites, A. (2017). Lesser devil rays Mobula cf. hypostoma from Venezuela are almost twice their previously reported maximum size and may be a new sub-species. Journal of Fish Biology, 90(3), 1142-1148. DOI
06. Nirchio, M., Oliveira, C., Siccha-Ramirez, R., Sene, V., Sánchez-Romero, O., Ehemann, N., Milana, V., Rossi, A. & Sola, L. (2016). Cryptic Caribbean species Scorpaena (Actinopterigii: Scorpaeniformes) suggested by cytogenetic and molecular data. Journal of Fish Biology, 90(4), 1947-1957. DOI: 10.1111/jfb.13089
05. Tagliafico, A., Ehemann, N., Rangel, M. & Rago, N. (2016). Exploitation and reproduction of the bullnose ray (Myliobatis freminvillei) caught in an artisanal fishery in La Pared, Margarita Island, Venezuela. Fishery Bulletin, 114(2), 144-152. DOI: 10.7755/FB.114.2.2
04. *Ehemann, N., Marín-Sanz, J. & Barany-González, M. (2016). Two cases of two-head shark embryos, smalleye smooth-hound Mustelus higmani and the blue shark Prionace glauca. Boletín de Investigaciones Marinas y Costeras, 45(1), 149-153. DOI: 10.25268/bimc.invemar.2016.45.1.636
03. *Ehemann, N., Rigio, P. & Cedeño-Posso, C. (2015). Macro-medusas (Cnidaria: Cubozoa, Hydrozoa y Scyphozoa) observadas en las costas del estado Nueva Esparta, Venezuela. Boletín del Instituto Oceanográfico de Venezuela, 54(2), 185-190
02. *Ehemann, N., González-González, L. & Jiménez, I. (2015). Ictiofauna de los embalses y lagunas dulceacuícolas de la Isla de Margarita, Nueva Esparta, Venezuela. Boletín del Instituto Oceanográfico de Venezuela, 54(1), 71-75.
01. Nirchio, M., Ehemann, N., Siccha-Ramirez, R., Ron, E., Pérez, J., Rossi, A. & Oliveira C. (2014). Karyotype of the invasive species Pterois volitans (Scorpaeniformes: Scorpaenidae) from Margarita Island, Venezuela. Revista de Biología Tropical. https://doi.org/10.15517/rbt.v62i4.13029