INVESTIGADORES
JAUBET Maria Lourdes
congresos y reuniones científicas
Título:
Structure of intertidal benthic community in areas organically impacted of Mar del Plata, Argentina (SW Atlantic).
Autor/es:
MARIA DE LOS ANGELES SANCHEZ; JAUBET MARÍA LOURDES; MARIA SILVIA RIVERO; EDUARDO ALBERTO VALLARINO; RODOLFO ELÍAS
Lugar:
Lecce
Reunión:
Conferencia; 10th International Polychaete Conference; 2010
Resumen:
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The intertidal zone around Mar
del Plata, Argentina
is characterized by dense mussel beds of the small mytilid Brachidontes rodriguezii
established on natural or artificial hard substrates. The community also
develops in sewage impacted areas on abrasion platforms being used for
environmental impact assessment by sewage discharges, as well as their
associated polychaetes. Organic enrichment of sediments due to sewage may
result in a series of non-linear changes in the abundance, biomass and
diversity of benthic organisms, in both spatial and temporal patterns. The polychaetes are
one the most useful marine taxa for detection of pollution because they live at
the water-sediment interface. The present study was carried out in the
intertidal zone around Mar del Plata
sewage effluent. The samples were collected during November-December 2008, and January-
February of 2009 in
two Control and two Impacted areas to assess spatial and short-term impact
(Before-After Summer). Multimensional scaling (MDS) and Similarity Analysis (ANOSIM)
were employed to evaluate differences between areas and before-after summer. Differences
due areas are highly significant (R= 0.716, p 0.1%). Species that most
contributed to differences are B. rodriguezii (dominant in Control
areas) and Boccardia sp. (dominant in Impacted areas, but also
subdominant in Control 2). Differences in Before-After Summer were not
significant. The irruption of Boccardia sp. in the area produces a great
change in the dynamics of the area. Impacted areas resulted almost permanently
covered by the new Boccardia species, producing biogenic reefs. The
monoculture of this polychaete outcompete all other species of the intertidal
community. Microbiological and
coprostanol analyses were employed to detect the influence of sewage in the
spatial and before-after scale. However data from January and most of the
environmental data are still under analysis.