LAGO ALCHICHICA PDF

Lago Alchichica se localiza a una elevación de msnm con una profundidad 62 m y es de agua n organismos endémicos y se encuentran. Lago-de-Alchichica. Quantcast. PUEBLA, MEXICO. Variación temporal en la abundancia de Poblana Alchichica en un hábitat ribereño del lago de alta elevación,. Lago de Alchichica, Puebla.

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Presentado 17 de enero deaceptado 9 de alchichiica decorrecciones 31 de enero de The distribution and abundance of organisms within a pond or lake can reflect the result of a variety of factors. We examined alchichca abundance of the endemic fish, Poblana alchichica, in Lago de Alchichica, Puebla, Mexico, as alchicica as how the abundance varied among months.

Dissolved oxygen, temperature, and salinity varied among months. The abundance of Poblana alchichica peaked in December and February. For the months when fish were observed, their abundances were positively related to dissolved oxygen concentration and were generally not related to temperature. Our results provide evidence that there is substantial seasonal variation in the abundances of Poblana alchichica and that within months, their distributions are likely driven by dissolved oxygen than either temperature or salinity.

Abundance, dissolved alchkchica, Poblana alchichica, salinity, seasonal variation, temperature. La abundancia de Poblana alchichica fue mayor en diciembre y febrero. The distribution of organisms within a pond or lake can reflect the result of a variety of factors.

For example, the abiotic or physical characteristics of the environment can influence where fish are found e,g, Penczak et al.

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In other cases, biotic factors such as macrophytes, predators, or competitors, can affect their distribution e. Changes in these factors may also be responsible for lagoo, or partially explaining, seasonal variations in the distribution and abundance of fish e. The status of endemic alchochica Poblana alchichica Atherinidae is difficult to alchkchica due to habitat condition, intrinsic biological vulnerability and human impact Alcocer et al.

Acccording to these authors, Poblana alchichica fits the threatened species risk category SEMARNAT, because of its reduced distribution area “and several risk factors endanger the survival of this silverside by altering its habitat and by diminishing its population size”. For these reasons, Poblana alchichica should be changed to the category, in danger of extinction, because of factors like habitat destruction, detergents discharged into the littoral zone, and domestic wastewater discharged into the same area around the lake.

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We examined the abundance of this endemic fish in the Lago de Alchichica, Puebla, Mexico.

We also examined how the abundance varied among months throughout the year. In particular, we were interested in determining the effect of dissolved oxygen, temperature, and salinity on the distribution and abundance of these fish.

Both temperature and dissolved oxygen are frequently important in explaining the distribution of fish, both within and among ponds, lakes, and rivers e. Lago de Alchichica is a crater lake approximately 1. The vegetation surrounding the lake is thorny scrub. Poblana alchichica is a fish of medium size with prognathous mouth, dorsal fin with 5 flexible thorns, the second dorsal present a small thorn, anal extensive fin with 13 to 16 radioes, pectoral 11 to 13 radioes.

Scutelation complete 40 to 52 in a longitudinal series. Without pore in the lateral line De Buen, We conducted surveys of near-shore habitat in the Lago de Alchichica monthly from September to May to determine the distribution of Poblana alchichica. We surveyed 32 sites around the shoreline of the lake. Surveys took place from to h. Each site consisted of an approximately 6 m long x 1 m wide section of shoreline.

We used a seine to collect Poblana alchichica from each site. The data followed a normal distribution, for this reason we used ANOVA to compare salinity, temperature, dissolved oxygen, and abundance of Poblana alchichica among months. We used separate multiple regressions for each month in which this fish was present to examine the relationship between dissolved oxygen, temperature and abundance of Poblana alchichica salinity showed no variation within months and so was not included in these analyses.

Dissolved oxygen levels varied among months, with September having lower levels than the other months Fig. Temperature also significantly varied among months, with a decrease in December Fig. Salinity varied among months, with levels in May being higher than the other months Fig. The abundance of fish varied among months with the highest abundances in December and February Fig. For all months in which fish were observed, their abundances were positively related to, dissolved oxygen concentration and were not related to temperature, although in December there was a positive relationship between fish abundance and temperature that approached significance Table 1.

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The lack of seasonal variation studies on Poblana alchichica or other atherinids fishes does not reveal which factors are related to its abundance trough time. This is the only study that has focused on the distribution and abundance of this species in relation to the bathymetry of Lago de Alchichica Alcocer et al.

Our results show that there is substantial seasonal variation in the abundance of Poblana alchichica. Peaks in abundances occurred in December and February. In Sonora, Mexico, Poeciliopsis spp. Within months, the distribution of Poblana alchichica was related to dissolved oxygen, but generally not to temperature. Some species of Poeciliopsis are known to have a relatively good tolerance for high temperatures Carveth et al.

Laguna de Alchichica (Puebla) – All You Need to Know BEFORE You Go (with Photos) – TripAdvisor

A threatened silverside species? Verh Internat Verein Limnol. Comparison of upper thermal tolerances of native and non-native fish species in Arizona. Trans Am Fisheries Soc.

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