Abundancia de nematodos marinos de vida libre en relación con las características fisicoquímicas de sedimentos experimentales y naturales

Virginia Lo Russo; Agustina Ferrando; Marta Commendatore; Catalina Pastor

doi:10.24215/25456377e124

Authors

Virginia Lo Russo Instituto de Diversidad y Evolución Austral (CCT CONICET - CENPAT) https://orcid.org/0000-0001-8141-2450
Agustina Ferrando Instituto de Diversidad y Evolución Austral (CCT CONICET - CENPAT)
Marta Commendatore Centro para el Estudio de Sistemas Marinos (CCT CONICET-CENPAT)
Catalina Pastor Instituto de Diversidad y Evolución Austral (CCT CONICET - CENPAT)

DOI:

https://doi.org/10.24215/25456377e124

Keywords:

Experiment, Nematode, San Jorge Gulf, Pollution,

Abstract

Nematodes have been widely used to evaluate different types of disturbances. The goal of this work was to compare the abundance of free-living marine nematodes communities at in situ and ex situ conditions, to assess the effect of experimental conditions in the laboratory. For this purpose, sediment samples were collected (n=4) at 3 sites in San Jorge Gulf (GSJ) with different history of pollution, and then incubated in the laboratory under controlled conditions of light, air and temperature for 45 days. At the end of this period, the ex situ treatment samples were analyzed, and an additional four samples were collected at the study sites (in situ). We compared the abundance of nematodes and characteristics of the sediment between both sets of samples. Restinga Alí and Playa Alsina showed increased abundance of nematodes (over 300 and 600%, respectively) in ex situ physico-chemical conditions compared to in situ conditions, while Punta Gravina showed lower abundance (less than 40%). Results showed an effect of the laboratory conditions set on nematode fauna. This effect was more evident in sediments from sites that had no previous history of pollution.

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