Núñez-Alamo, R. (2023). Caracterización demográfica del complejo Tropocyclops prasinus (Copépoda, Cyclopoida). [Demographic characterization of the complex Tropocyclops prasinus (Copépoda, Cyclopoida). Tesis de Maestría, Universidad Nacional Autónoma de México, México, D.F., Mexico. 60 pp. [In Spanish; English abstract].

475738

Núñez-Alamo, R.

2023

60 pp. [In Spanish; English abstract]

Publication

https://hdl.handle.net/20.500.14330/TES01000840580

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Tropocyclops is one of the 10 genera of copepods widely distributed in Mexican water bodies. At taxonomic level, it is difficult to identify Tropocyclops, because only measures and proportions of specific structures are taken to determine the subspecies of this complex. Data concerning ecological aspects of this complex, in general, is limited. Tropocyclops prasinus was chosen for this work due to its wide distributed throughout Mexican water bodies. The aim of this study was to perform food preference test of the subspecies T. prasinus prasinus and T. prasinus aztequei, from México state and Veracruz, respectively. Rotifers (Brachionus havanaensis, Plationus patulus and Brachionus calyciflorus) and cladocerans (Alona glabra, Moina macrocopa and Ceriodaphnia dubia), which have been found that coexist in the same environment, were offered as prey. The results show differences in the preferences of prey between T. prasinus aztequei and T. prasinus prasinus. We observed that T. p. aztequei had preference for B. calyciflorus, whereas T. p. prasinus consumed B. havanaensis. In addition, there were significant differences in generational time and survivorship between algae and mixed (algae and rotifers) treatments. However, 7 subspecies exposed only to algae treatments generational time values and population growth rates, significant differences were observed. Based on the results, we found that T. p. prasinus presents an omnivorous behavior, whereas, T. p. aztequei shows a better performance in reproduction and survivorship when exposed to a diet based on algae. The population growth rate for T. p. aztequei was 0.033 and 0.014, whereas, for T. p. prasinus varied between 0.015 and 0.090 between treatment 1 (algae) and treatment 2 (algae and rotifers), respectively.

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