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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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        Abstract - Issue Nov 2017, 38 (6)                                                                                                             Back



nstantaneous and historical temperature effects on a-pinene

Annual phytoplankton dynamics in La Antigua River, Mexico

 

M.L. Gayt?n-Herrera1, E. Cuna-P?rez2 and P. Ram?rez-Garc?a1*

1Research and Postgraduate Division, UNAM, FES-Iztacala, Av. de los Barrios No. 1, 54090 Tlalnepantla, Estado de M?xico, M?xico

2PILT Project, Paleolimnology Laboratory, UNAM, FES-Iztacala, Av. de los Barrios No. 1, 54090 Tlalnepantla, Estado de M?xico, M?xico

*Corresponding Author E-mail: micro@unam.mx

 

 

 

Key words

Diatoms

La Antigua River

Phytoplankton

Tropical rivers

 

 

 

Publication Data

Paper received : 20.07.2016

Revised received : 21.04.2017

Re-revised received : 19.05.2017

Accepted : 06.06.2017

 

Abstract

Aim: To contribute to the knowledge of rivers in Mexico, we studied the phytoplankton abundance and diversity over a year in La Antigua River, east Mexico.

 

Methodology: Monthly sampling was performed for one year (March 2013 to February 2014), at 5 stations. Physicochemical parameters and chlorophyll-a were analyzed. A diagram of Holston-Tukey was performed to identify the dominant, constant, temporary and rare species Detrended Correspondence Analysis was applied to find possible links between species and environmental variables. Shannon-Wiener index was calculated.

 

Results: Mean water temperature was 26?C and depth was 1.7 m, dissolved oxygen was 8.9 mg l-1, pH was 7.8, turbidity value was 10.6 NTU, conductivity was 488 ?S cm-1, SRP and nitrate were 2.6 ?g l-1 PO4-3-P and 0.6 mg l-1 NO3-N, chlorophyll-a was 5 ?g l-1. About 200 taxa of microalgae were recorded. Diatoms were dominated. Chlorophyceae were rich in species. Cyanoprokaryota ranked third in species richness, Euglenophyceae, Dinophyceae, Cryptophyceae and Crysophyceae had a lower richness. ?

 

Interpretation: Stations 2 and 3 had the highest contamination by wastewater discharges of the population of La Antigua. Stations 4 and 5 were separated due to increases in salinity. These stations are the closest to the sea. Station 1 is likely to be cleaner and less salty.

 

 

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