A Seasonal Study Reveals the Occurrence of Exotic Rotifers, the River Antigua, Veracruz, Close to the Gulf of Mexico
Por:
Nandini, S., Sarma, S. S. S., Gulati, R. D.
Publicada:
1 jul 2017
Resumen:
Zooplankton studies in Mexican rivers are few despite the fact that
Mexico has >200 rivers. We present data on the seasonal diversity of
rotifers during 2013-2014 from the river La Antigua, near Veracruz. We
collected samples from 15 stations along a horizontal gradient of
similar to 5km, from the upper reaches to about 2km from the sea. The
physico-chemical variables analysed were temperature, pH, dissolved
oxygen, conductivity, nitrates, phosphates, Secchi depth and salinity.
From each site, 80L of water was filtered with a 50-m plankton net.
Rotifers were identified and quantified using a Sedgewick Rafter cell.
The river is shallow (maximum depth 2.5m during the rainy season). Our
observations indicated that the phytoplankton community was dominated by
diatoms; the chlorophyll a concentrations ranged from 0.55 to 26.1g L-1
over the study period. We found >125 rotifer species belonging to 21
families, mostly from the Lecanidae, Brachionidae, Notommatidae and
Lepadellidae. The density of rotifers was low, <40 ind. L-1, but species
diversity (Shannon-Wiener) ranged, except for a onetime minimum of 0.25,
from 2.0 to 4.0 for most part of the year. We also encountered Notholca
cf. liepetterseni, an endemic species to Europe and Lecane yatseni,
endemic to Asia. Other new records included Lecane rhytida and Ptygura
melicerta. The importance of long-term studies in rivers is emphasized.
Copyright (c) 2017 John Wiley & Sons, Ltd.
Filiaciones:
Nandini, S.:
Univ Nacl Autonoma Mexico, Lab Zool Acuat, Campus Iztacala,Ave Barrios 1, Mexico City 54090, DF, Mexico
Sarma, S. S. S.:
Univ Nacl Autonoma Mexico, Lab Zool Acuat, Campus Iztacala,Ave Barrios 1, Mexico City 54090, DF, Mexico
Gulati, R. D.:
NIOO Netherlands Inst Ecol, Dept Aquat Ecol, Wageningen, Netherlands
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