franja-sup-Home franja-sup-UV

EspañolEnglish

Volume 40 - Number 2 - 2005
Article


First survey of macroinfauna in the Mar del Plata Harbor (Argentina), and the use of polychaetes as pollution indicators

Ma. Silvia Rivero1, Rodolfo Elías1 and Eduardo A. Vallarino1

1 Departamento de Ciencias Marinas, Universidad Nacional de Mar del Plata. Deán Funes 3350 (B 7602 AYL). Mar del Plata, Argentina

 

E-mail: roelias@mdp.edu.ar

 

Harbors share a number of similar problems, such as water and sediment pollution. In this work we analyze spatial variation of macroinfauna, with special emphasis in polychaete abundance to characterize the environmental health of Mar del Plata Harbor. Twelve stations were sampled with replicated 0.05 m2 van Veen grabs, with environmental variables from the water column and sediments in December 2001. Polychaetes (23 of 35 taxa) constituted 62% of the total abundance. A multi dimensional scaling analysis and a redundancy analysis showed three groups of stations: one at the mouth of the port, with healthy environmental conditions and characterized by Mediomastus sp., Maldanidae and Aglaophamus uruguayi; other in the inner harbor, with poor environmental conditions and inhabited only by Capitella “capitata” sp., and a third intermediate and more diverse group with Polydora spp., Tharyx sp., Mediomastus sp., Capitella “capitata” sp., and Capitella sp. Differences among pre-defined groups were significant. It is hypothesized that strong hydrodynamics affects the stations at the mouth, as shown by low organic content and the dominance of sandy sediments. In the inner harbor, poor environmental conditions are due to restricted water movement, prevalence of silt sediments, and high content of pollutants. Abundance of Capitella spp. correlated to total organic carbon content, except in the inner harbor. It is possible that high concentrations of hydrocarbons in the inner harbor explain the low abundance of these species, as well as the absence of other benthic animals, and the low diversity values. Polychaetes are useful pollution indicators in this harbor.


Key words: macrobenthic community, indicator species, environmental variables, multivariate analyses


pdficon-rbmoDownload

 

1Laboratorio de Zooplancton, Instituto de Ciencias del Mar y Limnología,Universidad Nacional Autónoma de México. A. P. 70-305, 04510 México, D. F. México
 
atasehir evden eve nakliyat avcilar evden eve nakliyat umraniye evden eve nakliyat beylikduzu evden eve nakliyat sisli evden eve nakliyat bahcelievler evden eve nakliyat