Effect of organic and inorganic turbidity on the zooplankton community structure of a shallow waterbody in Central Mexico (Lake Xochimilco, Mexico)
Por:
Gayosso-Moralesl, M. A., Nandini, S., Martinez-Jeronimo, F. F., Sarma, S. S. S.
Publicada:
1 nov 2017
Resumen:
Aim: Lake Xochimilco is shallow (< 2m) water-body in Mexico City
consisting of several interconnected canals. It is now eutrophic, with
high levels of turbidity as a result of suspended sediment and
phytoplankton blooms. We selected two sites, the Rowing channel with
organic turbidity due to cyanobacterial blooms and the Main channel with
inorganic turbidity from re-suspended clay. The aim of this work was to
present data on zooplankton dynamics in two channels of the lake over
one year (June, 2013 to May. 2014).
Methodology: We collected zooplankton by filtering 80L of water from two
sites in each of the canals, as well as measuring temperature, pH,
conductivity, dissolved oxygen, nitrate-N and phosphate-Ps,
Chlorophyll-a, and Secchi disk transparency at each of the sites.
Results: The zooplankton community was dominated by rotifers;
cladocerans and copepods were few. The common rotifer genera in thelake
were Keratella. Brachionus, Polyarthra, Trichocerca, Filinia, Asplanchna
chydorid cladocerans like Chydorus sphaericus, Pleuroxus varidentatus,
Alona sp. and copepods Acantho cyclops americanus and Microcyclops
rube//us. The canonical correspondence analysis (CCA) in the Rowing
channel station, showed that the first two ordination axes explained
46% of the variance of the species data in CCA. The first and second
axes were well correlated with the environmental data. The Monte Carlo
permutation test was significant on the first axis.
Interpretation: Our study showed that the presence of organic turbidity
as observed in the rowing channel had a greater adverse effect than the
inorganic turbidity on zooplankton density and diversity.
Filiaciones:
Gayosso-Moralesl, M. A.:
Inst Politecn Nacl, Escuela Nacl Ciencias Biol, Ciencias Quim Biol, Carpio & Plan Ayala S-N, Mexico City 11340, DF, Mexico
Nandini, S.:
Univ Nacl Autonoma Mexico, Lab Aquat Zool, Campus Iztacala,Av Barrios 1,AP 314, Tlalnepantla 54090, State Of Mexico, Mexico
Martinez-Jeronimo, F. F.:
Inst Politecn Nacl, Escuela Nacl Ciencias Biol, Ciencias Quim Biol, Carpio & Plan Ayala S-N, Mexico City 11340, DF, Mexico
Sarma, S. S. S.:
Univ Nacl Autonoma Mexico, Lab Aquat Zool, Campus Iztacala,Av Barrios 1,AP 314, Tlalnepantla 54090, State Of Mexico, Mexico
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