Our Group has been developing its activities since the year 2000 within the Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP) facilities, as well as to actively participate in many research projects funded by INIDEP, CONICET, ANPCyT, and UNMDP.

Changes in composition, relative abundance and distribution of planktonic taxa and species in particular can significantly affect the functioning of marine ecosystems, since they propagate through trophic food webs affecting the biogeochemical cycles in the ocean. In the current context of global warming and climate change, these changes have an even higher relevance.

Therefore, the main goals of our research group are (i) to study the diversity of the several planktonic taxa in different sectors of the Argentine Sea; (ii) to analyze its temporal and spatial scales of variation and the effect of environmental factors upon this variability; and (iii) to evaluate the possible implications of such variations upon higher trophic levels. Within the zooplanktonic groups studied, crustaceans (copepods, cladocerans, hyperiid amphipods and euphausiids) are dominant and play a key role in fish food webs. In frontal areas, particularly, these groups form dense assemblages that constitute feeding and nursery grounds for fish and mollusks species.

It is worth noting that, since the beginning of the group up to present, several graduate and doctoral thesis have been finished. Moreover, the members of the group have been abroad to capacitate and specialize in their research lines. Human resources formation is currently going on.

To fulfill the above mentioned goals, several research lines are currently developing, including both classic and emerging methodologies:

(i) Diversity. Taxonomic identification of the different planktonic taxa by means of classic optical techniques. Application of molecular techniques to resolve taxonomic uncertainties. Determination of taxa assemblages, as well as recognition of key species in many pelagic ecosystems.
(ii) Time-series. Analysis of the components of planktonic communities and their variation in different spatio-temporal scales. Relationship with hydrological and climatic variables. Application of semi-automatic methods to identify, count and estimate biomass of zooplankton components.
(iii) Trophic interactions. Determination of key zooplanktonic species in the diet of larvae, juveniles and adult of fish of commercial interest. Analysis of gut contents and their relationship with available zooplankton prey in the field. Application of biochemical tools –lipids and fatty acids- to establish the nutritional status of predators and prey. Fish species of both current (Engraulis anchoita, Scomber japonicus and Merluccius hubbsi) and potential commercial interest are considered (Trachurus lathami).
(iv) Satellite oceanography. Analysis of temporal and spatial changes in environmental factors that might affect planktonic communities, by combining satellite (intensity, start and duration of phytoplankton blooms, sea surface temperature) and in situ data.
(v) Fish recruitment. Production of recruitment indices for fish of commercial interest.

Director
Dra. María Delia Viñas
Researcher Conicet

Professor

Do Souto, M., Brown, D. R., Segura, V., Negri, R., Temperoni, B., Cepeda, G., … Diaz, M. V. (en prensa). Putting the pieces together: Recent growth, nutritional condition, and mortality of Engraulis anchoita larvae in the Southwest Atlantic. Fisheries Oceanography. https://doi.org/10.1111/fog.12434
Temperoni, B., Massa, A., & Viñas, M. D. (2019). Fatty acids composition as an indicator of food intake in Merluccius hubbsi larvae. Journal of the Marine Biological Association of the United Kingdom, 99(4), 983–990. https://doi.org/10.1017/S002531541800070X
Temperoni, B., Massa, A., Derisio, C., Martos, P., Berghoff, C., & Viñas, M. D. (2018). Effect of nursery ground variability on condition of age 0+ years Merluccius hubbsi. Journal of Fish Biology, 93(6), 1090–1101. https://doi.org/10.1111/jfb.13816
Cepeda, G. D., Temperoni, B., Sabatini, M. E., Viñas, M. D., Derisio, C. M., Santos, B. A., … Padovani, L. N. (2018). Zooplankton communities of the Argentine continental shelf (SW Atlantic, ca. 34°–55°s), an overview. In Plankton Ecology of the Southwestern Atlantic (pp. 171–199). Springer, Cham. https://doi.org/10.1007/978-3-319-77869-3_9
Cepeda, G. D., Di Mauro, R., Martos, P., & Viñas, M. D. (2012). A section-sampling design to assess zooplankton distribution in a highly complex hydrographic region (SW Atlantic Ocean, 34-41oS): insights for a new time series? Brazilian Journal of Oceanography, 60(3), 381–390.
Cepeda, G., Di Mauro, R., Hozbor, M., Colleoni, D. C., Hernández, D., & Viñas, M. (2015). Spatial variation in life-history traits of Oithona spp. in a shallow temperate estuarine system (Río de la Plata, south-west Atlantic) during spring. Marine and Freshwater Research, 66(9), 795–804.
Temperoni, B., Viñas, M. D., Martos, P., & Marrari, M. (2014). Spatial patterns of copepod biodiversity in relation to a tidal front system in the main spawning and nursery area of the Argentine hake Merluccius hubbsi. Journal of Marine Systems, 139, 433–445. Retrieved from http://www.sciencedirect.com/science/article/pii/S0924796314002152
Temperoni, B., & Viñas, M. D. (2013). Food and feeding of Argentine hake (Merluccius hubbsi) larvae in the Patagonian nursery ground. Fisheries Research, 148, 47–55. Retrieved from http://www.sciencedirect.com/science/article/pii/S0165783613001896
Sabatini, M., Mianzan, H. W., Padovani, L. N., Álvarez Colombo, G., & Viñas, M. D. (2015). Aspectos poblacionales de Themisto gaudichaudii, una especie clave en la trama trófica de la plataforma patagónica austral. Retrieved from http://www.oceandocs.org/handle/1834/8521
Marrari, M., Padovani, L. N., Cepeda, G. D., Di Mauro, R., & Viñas, M. D. (2013). El zooplancton del hábitat reproductivo de la población bonaerense de anchoíta (Engraulis anchoita), con especial énfasis en crustáceos. Retrieved from http://www.oceandocs.org/handle/1834/5497
Temperoni, B., Viñas, M. D., & Hernández, D. (2013). Enhancing fish diet analysis: equations to reconstruct Themisto gaudichaudii and Euphausia lucens length from partially digested remains. Marine Biology Research, 9(3), 327–332. Retrieved from http://imarest.tandfonline.com/doi/abs/10.1080/17451000.2012.739696
Temperoni, B., Viñas, M. D., & Buratti, C. C. (2013). Feeding strategy of juvenile (age-0+ year) Argentine hake Merluccius hubbsi in the Patagonian nursery ground. Journal of Fish Biology, 83(5), 1354–1370. Retrieved from http://onlinelibrary.wiley.com/doi/10.1111/jfb.12238/full
Viñas, M. D., Negri, R. M., Cepeda, G. D., Hernández, D., Silva, R., Daponte, M. C., & Capitanio, F. L. (2013). Seasonal succession of zooplankton in coastal waters of the Argentine Sea (Southwest Atlantic Ocean): prevalence of classical or microbial food webs. Marine Biology Research, 9(4), 371–382. Retrieved from http://imarest.tandfonline.com/doi/abs/10.1080/17451000.2012.745003
Marrari, M., Signorini, S. R., McClain, C. R., Pájaro, M., Martos, P., Viñas, M. D., … Buratti, C. (2013). Reproductive success of the Argentine anchovy, Engraulis anchoita, in relation to environmental variability at a mid-shelf front (Southwestern Atlantic Ocean). Fisheries Oceanography, 22(3), 247–261. Retrieved from http://onlinelibrary.wiley.com/doi/10.1111/fog.12019/full
Cepeda, G. D., Blanco-Bercial, L., Bucklin, A., Berón, C. M., & Viñas, M. D. (2012). Molecular systematic of three species of Oithona (Copepoda, Cyclopoida) from the Atlantic Ocean: comparative analysis using 28S rDNA. PLoS One, 7(4), e35861. Retrieved from http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0035861
Researchers
Dra. Georgina Cepeda
Researcher Conicet
Do Souto, M., Brown, D. R., Segura, V., Negri, R., Temperoni, B., Cepeda, G., … Diaz, M. V. (en prensa). Putting the pieces together: Recent growth, nutritional condition, and mortality of Engraulis anchoita larvae in the Southwest Atlantic. Fisheries Oceanography. https://doi.org/10.1111/fog.12434
Cepeda, G. D., Temperoni, B., Sabatini, M. E., Viñas, M. D., Derisio, C. M., Santos, B. A., … Padovani, L. N. (2018). Zooplankton communities of the Argentine continental shelf (SW Atlantic, ca. 34°–55°s), an overview. In Plankton Ecology of the Southwestern Atlantic (pp. 171–199). Springer, Cham. https://doi.org/10.1007/978-3-319-77869-3_9
Berkunsky, I., Quillfeldt, P., Brightsmith, D. J., Abbud, M. C., Aguilar, J. M. R. E., Alemán-Zelaya, U., … Masello, J. F. (2017). Current threats faced by Neotropical parrot populations. Biological Conservation, 214, 278–287. https://doi.org/10.1016/j.biocon.2017.08.016
Cepeda, G. D., Di Mauro, R., Martos, P., & Viñas, M. D. (2012). A section-sampling design to assess zooplankton distribution in a highly complex hydrographic region (SW Atlantic Ocean, 34-41oS): insights for a new time series? Brazilian Journal of Oceanography, 60(3), 381–390.
Cepeda, G., Di Mauro, R., Hozbor, M., Colleoni, D. C., Hernández, D., & Viñas, M. (2015). Spatial variation in life-history traits of Oithona spp. in a shallow temperate estuarine system (Río de la Plata, south-west Atlantic) during spring. Marine and Freshwater Research, 66(9), 795–804.
Marrari, M., Padovani, L. N., Cepeda, G. D., Di Mauro, R., & Viñas, M. D. (2013). El zooplancton del hábitat reproductivo de la población bonaerense de anchoíta (Engraulis anchoita), con especial énfasis en crustáceos. Retrieved from http://www.oceandocs.org/handle/1834/5497
Viñas, M. D., Negri, R. M., Cepeda, G. D., Hernández, D., Silva, R., Daponte, M. C., & Capitanio, F. L. (2013). Seasonal succession of zooplankton in coastal waters of the Argentine Sea (Southwest Atlantic Ocean): prevalence of classical or microbial food webs. Marine Biology Research, 9(4), 371–382. Retrieved from http://imarest.tandfonline.com/doi/abs/10.1080/17451000.2012.745003
Marrari, M., Signorini, S. R., McClain, C. R., Pájaro, M., Martos, P., Viñas, M. D., … Buratti, C. (2013). Reproductive success of the Argentine anchovy, Engraulis anchoita, in relation to environmental variability at a mid-shelf front (Southwestern Atlantic Ocean). Fisheries Oceanography, 22(3), 247–261. Retrieved from http://onlinelibrary.wiley.com/doi/10.1111/fog.12019/full
Cepeda, G. D., Blanco-Bercial, L., Bucklin, A., Berón, C. M., & Viñas, M. D. (2012). Molecular systematic of three species of Oithona (Copepoda, Cyclopoida) from the Atlantic Ocean: comparative analysis using 28S rDNA. PLoS One, 7(4), e35861. Retrieved from http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0035861
Dra. Brenda Temperoni
Reseracher Conicet
Do Souto, M., Brown, D. R., Segura, V., Negri, R., Temperoni, B., Cepeda, G., … Diaz, M. V. (en prensa). Putting the pieces together: Recent growth, nutritional condition, and mortality of Engraulis anchoita larvae in the Southwest Atlantic. Fisheries Oceanography. https://doi.org/10.1111/fog.12434
Temperoni, B., Massa, A., & Viñas, M. D. (2019). Fatty acids composition as an indicator of food intake in Merluccius hubbsi larvae. Journal of the Marine Biological Association of the United Kingdom, 99(4), 983–990. https://doi.org/10.1017/S002531541800070X
Temperoni, B., Massa, A., Derisio, C., Martos, P., Berghoff, C., & Viñas, M. D. (2018). Effect of nursery ground variability on condition of age 0+ years Merluccius hubbsi. Journal of Fish Biology, 93(6), 1090–1101. https://doi.org/10.1111/jfb.13816
Baliña, S., Temperoni, B., López Greco, L. S., & Tropea, C. (2018). Losing reproduction: effect of high temperature on female biochemical composition and egg quality in a freshwater crustacean with direct development, the red cherry shrimp, Neocaridina davidi (Decapoda, Atyidae). The Biological Bulletin, 234(3), 139–151. https://doi.org/10.1086/698266
Cepeda, G. D., Temperoni, B., Sabatini, M. E., Viñas, M. D., Derisio, C. M., Santos, B. A., … Padovani, L. N. (2018). Zooplankton communities of the Argentine continental shelf (SW Atlantic, ca. 34°–55°s), an overview. In Plankton Ecology of the Southwestern Atlantic (pp. 171–199). Springer, Cham. https://doi.org/10.1007/978-3-319-77869-3_9
Temperoni, B., Viñas, M. D., Martos, P., & Marrari, M. (2014). Spatial patterns of copepod biodiversity in relation to a tidal front system in the main spawning and nursery area of the Argentine hake Merluccius hubbsi. Journal of Marine Systems, 139, 433–445. Retrieved from http://www.sciencedirect.com/science/article/pii/S0924796314002152
Temperoni, B., & Viñas, M. D. (2013). Food and feeding of Argentine hake (Merluccius hubbsi) larvae in the Patagonian nursery ground. Fisheries Research, 148, 47–55. Retrieved from http://www.sciencedirect.com/science/article/pii/S0165783613001896
Temperoni, B., Viñas, M. D., & Hernández, D. (2013). Enhancing fish diet analysis: equations to reconstruct Themisto gaudichaudii and Euphausia lucens length from partially digested remains. Marine Biology Research, 9(3), 327–332. Retrieved from http://imarest.tandfonline.com/doi/abs/10.1080/17451000.2012.739696
Temperoni, B., Viñas, M. D., & Buratti, C. C. (2013). Feeding strategy of juvenile (age-0+ year) Argentine hake Merluccius hubbsi in the Patagonian nursery ground. Journal of Fish Biology, 83(5), 1354–1370. Retrieved from http://onlinelibrary.wiley.com/doi/10.1111/jfb.12238/full