Diversity of Rotifera (Monogononta) and Egg Ratio of Selected Taxa in the Canals of Xochimilco (Mexico City)
Por:
Jimenez-Contreras, Jorge, Nandini, S., Sarma, S. S. S.
Publicada:
1 oct 2018
Resumen:
Rotifer dominance in wetland ecosystems is due to their ability to
survive and reproduce in the presence of cyanobacteria, ability to
occupy different niches and elimination of competing crustaceans by
predation. In addition, quality and quantity of food and physical and
chemical variables affect the rotifer abundances in these waterbodies.
Seasonal variations in food also affect the rotifer body size and egg
ratio (ER). We studied the species richness, diversity, female egg
ratio, morphometry, and density of rotifer species from four sites of
Lake Xochimilco that have been influenced by agriculture, urban waste,
and tourism. Zooplankton samples were collected on a monthly basis over
one year (February 2005 to January 2006) and we measured selected
physical and chemical variables including water depth, Secchi
transparency, temperature, pH, conductivity, alkalinity, hardness,
dissolved oxygen, biological oxygen demand-5day test (BOD5), nitrates
and nitrites and orthophosphates. We recorded 81 rotifer species,
representing 27 genera and 17 families. The Shannon-Wiener diversity
varied between 0.5 and 3.8 during the study and was highest in the rainy
season. The ER did not show a significant relationship between
ecological conditions and any rotifer species, indicating nearly stable
physical, chemical and biological conditions in which rotifers are able
to reproduce throughout the year.
Filiaciones:
Jimenez-Contreras, Jorge:
Univ Nacl Autonoma Mexico, Lab Zool Acuat, Edificio Unidad Morfofisiol, Campus Iztacala,Ave Barrios 1, Tlalnepantla 54090, Edo De Mexico, Mexico
Nandini, S.:
Univ Nacl Autonoma Mexico, Lab Zool Acuat, Edificio Unidad Morfofisiol, Campus Iztacala,Ave Barrios 1, Tlalnepantla 54090, Edo De Mexico, Mexico
Sarma, S. S. S.:
Univ Nacl Autonoma Mexico, Lab Zool Acuat, Edificio Unidad Morfofisiol, Campus Iztacala,Ave Barrios 1, Tlalnepantla 54090, Edo De Mexico, Mexico
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