Ecological effects of Irgarol 1051 and Diuron on a coastal meiobenthic community: A laboratory microcosm experiment

Gallucci, Fabiane; Castro, Ítalo Braga; Perina, Fernando César; Abessa, Denis Moledo de Souza; Teixeira, Amanda de Paula

doi:10.1016/j.ecolind.2015.05.030

Cited by 36 publications

(16 citation statements)

References 58 publications

(61 reference statements)

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“…1 at Sts 2 and 3 compared to St. 1. Such results are particularly interesting given that the same community has shown a similar response to contamination of sediments by antifouling biocides (Gallucci et al, 2015). This corroborates the group of predacious/omnivorous nematodes as more sensitive to disturbance (Bongers et al, 2001), and also confirms the genus Oncholaimellus as a sensitive genus (Danovaro et al, 1995; Gallucci et al, 2015).…”

Section: Discussionsupporting

confidence: 62%

“…Such results are particularly interesting given that the same community has shown a similar response to contamination of sediments by antifouling biocides (Gallucci et al, 2015). This corroborates the group of predacious/omnivorous nematodes as more sensitive to disturbance (Bongers et al, 2001), and also confirms the genus Oncholaimellus as a sensitive genus (Danovaro et al, 1995; Gallucci et al, 2015). Whereas the reasons for higher sensitivity of predacious nematodes to disturbance might be due to their longer-lived life strategy (Bongers et al, 2001), we believe that regarding contamination, the short-term response directed to this functional group might be due to their smooth cuticle, which is more permeable than more ornamented cuticles (Fonseca and Fehlauer-Ale, 2012), therefore being a major route for uptake of contaminants (Howell, 1983;Kammenga et al, 1994).…”

Section: Discussionmentioning

confidence: 88%

“…Concerning the exposure period, there was a decrease in nematode diversity and abundance after 15 days, regardless of treatment. Although this could be an effect of the enclosure in the microcosm experiment (Gallucci et al, 2015;Schratzberger et al, 2002), it is important to note that Nitokra sp. fecundity test also showed significantly lower fecundity rates in sediments which had been exposed for 15 days, independently of the treatment.…”

Section: Discussionmentioning

confidence: 99%

“…This was considered as a reference site because it is a "zone of special management" in the marine spatial zoning of the APA Marinha Litoral Norte (North Shore Marine Protected Area). Sediment sampling and defaunation followed Gallucci et al (2015). Another sampling was performed at the same site fifty days later to obtain sediment containing meiofauna (first 5 cm layer) to set the experiments (see Section 2.4).…”

Section: Sediment Collection and Defaunationmentioning

confidence: 99%

“…bacterivores, microvores, herbivores, omnivores, and predators). In the last decades, the development of such microcosm setups have allowed the investigation of the isolated effects of different pollutants in natural communities under controlled and reproducible conditions (Austen et al, 1994;Gallucci et al, 2015;Schratzberger et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

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Is the microcosm approach using meiofauna community descriptors a suitable tool for ecotoxicological studies?

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Choueri

Pauly³

et al. 2018

Ecotoxicology and Environmental Safety

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The usual approaches used in ecological risk assessment have been based on individual and population level standard procedures. Although these have been important tools to assess adverse effects on ecosystems, they are generally simplified and therefore lack ecological realism. Microcosm studies using meiobenthic communities offer a good compromise between the complexity of the ecosystem and the often highly artificial settings of laboratory experiments. An experiment was designed to investigate the potential of the microcosm approach using meiofauna as a tool for ecotoxicological studies. The experiment tested the ecological effects of exposure to sewage-impacted pore water simultaneously at the community level using meiofauna microcosms and at the individual level using laboratory fecundity tests with the copepod Nitokra sp. Specifically, the experiment tested the toxicity of pore water from three sites according to a contamination gradient. Both approaches were efficient in detecting differences in toxicity between the less and more contaminated sites. However, only multivariate data from community analysis detected differences in the gradient of contamination. In addition to information about toxicity, the community level microcosm experiment gave indications about sensitive and tolerant species, indirect ecological effects, as well as raised hypothesis about contamination routes and bioavailability to be tested. Considering the importance of meiofauna for benthic ecosystems, the microcosm approach using natural meiobenthic communities might be a valuable addition as a higher tier approach in ecological risk assessment, providing highly relevant ecological information on the toxicity of contaminated sediments.

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