Hernández-Martínez, O. (2014). Variación temporal de la biología reproductiva de Leptodiaptomus garciai (Copepoda: Calanoida) en el Lago Alchichica (Puebla, México). [Temporal variation in the reproductive biology of Leptodiaptomus garciai (Copepoda: Calanoida) in Lake Alchichica (Puebla, Mexico).]. Tesis de Maestría, Universidad Nacional Autónoma de México, México, D.F., Mexico. 53 pp. [In Spanish; English abstract].

475728

Hernández-Martínez, O.

2014

53 pp. [In Spanish; English abstract]

Publication

https://hdl.handle.net/20.500.14330/TES01000710726

Available for editors   [request]

Leptodiaptomus garciai is an endemic calanoid copepod of Alchichica Lake, dominating zooplankton biomass. The aim of this study was to describe the effect of temporal variations of temperature and phytoplankton biomass on some aspects of the reproductive biology of this organism (size of ovigerous females, clutch size, egg size, reproductive effort, percentage of body biomass allotted to reproduction, and hatching success of nauplii). The average temperature of the oxygenated zone of the water column showed a minimum of 14.8°C and a maximum of 19.1°C. The phytoplankton biomass was lower in the upper layer than in the lower layer (metalimnion), with 1.0 ± 0.6 mg/L and 1.4 ± 1.8 mg/L, respectively. Adult females consumed six algal species, the highest clearance rates were recorded for Nodularia spumigena and Oocystis parva (11.7 and 16.3 mL/copepod * day, respectively). Regarding reproductive variables, the length of ovigerous females varied from 821 ± 18 µm to 1,025 ± 51 µm, whereas their biomass (fresh weight) presented a minimum of 45 ± 2 µg and a maximum of 82 ± 9 µg, and were inversely correlated with temperature (r = -0.949, p < 0.001). The average weight of eggs ranged from 1.17 ± 0.28 µg to 0.35 ± 0.04 µg and was positively related to female size (r = 0.822, p = 0.001) and inversely with temperature (r = -0.792, p = 0.001). The clutch size increased from 2.1 ± 0.5 eggs/clutch to 9.3 ± 2.0 eggs/clutch and correlated with phytoplankton biomass (r = 0.682, p = 0.030 ), as well as reproductive effort (r = 0.636 , p = 0.048), which ranged from 1.45 µg/clutch and 5.91 µg/clutch. Hatching was usually above 85%, and neither of the environmental variables considered seemed to affect it. In conclusion, the temperature affected the size of ovigerous females and indirectly the size of eggs. The diet showed a major ecological effect because the amount of phytoplanktonic biomass affected the biomass females allot to reproduction, and the number of offspring.

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