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Boat noise affects meagre (Argyrosomus regius) hearing and vocal behaviour Texto completo
2021
Vieira, Manuel | Beauchaud, Marilyn | Amorim, M. Clara P. | Fonseca, Paulo J.
Boat noise affects meagre (Argyrosomus regius) hearing and vocal behaviour Texto completo
2021
Vieira, Manuel | Beauchaud, Marilyn | Amorim, M. Clara P. | Fonseca, Paulo J.
Aquatic noise has increased in last decades imposing new constraints on aquatic animals' acoustic communication. Meagre (Argyrosomus regius) produce loud choruses during the breeding season, likely facilitating aggregations and mating, and are thus amenable to being impacted by anthropogenic noise. We assessed the impact of boat noise on this species acoustic communication by: evaluating possible masking effects of boat noise on hearing using Auditory Evoked Potentials (AEP) and inspecting changes in chorus sound levels from free ranging fish upon boat passages. Our results point to a significant masking effect of anthropogenic noise since we observed a reduction of ca. 20 dB on the ability to discriminate conspecific calls when exposed to boat noise. Furthermore, we verified a reduction in chorus energy during ferryboat passages, a behavioural effect that might ultimately impact spawning. This study is one of few addressing the effects of boat noise by combining different methodologies both in the lab and with free ranging animals.
Mostrar más [+] Menos [-]Boat noise affects meagre (Argyrosomus regius) hearing and vocal behaviour Texto completo
2021
Vieira, Manuel | Beauchaud, Marilyn | Amorim, M. Clara P. | Fonseca, Paulo
Aquatic noise has increased in last decades imposing new constraints on aquatic animals' acoustic communication. Meagre (Argyrosomus regius) produce loud choruses during the breeding season, likely facilitating aggregations and mating, and are thus amenable to being impacted by anthropogenic noise. We assessed the impact of boat noise on this species acoustic communication by: evaluating possible masking effects of boat noise on hearing using Auditory Evoked Potentials (AEP) and inspecting changes in chorus sound levels from free ranging fish upon boat passages. Our results point to a significant masking effect of anthropogenic noise since we observed a reduction of ca. 20 dB on the ability to discriminate conspecific calls when exposed to boat noise. Furthermore, we verified a reduction in chorus energy during ferryboat passages, a behavioural effect that might ultimately impact spawning. This study is one of few addressing the effects of boat noise by combining different methodologies both in the lab and with free ranging animals. | info:eu-repo/semantics/acceptedVersion
Mostrar más [+] Menos [-]Boat noise affects meagre (Argyrosomus regius) hearing and vocal behaviour Texto completo
2021
Vieira, Manuel | Beauchaud, Marilyn | Amorim, Maria Clara P | Fonseca, Paulo
Aquatic noise has increased in last decades imposing new constraints on aquatic animals' acoustic communication. Meagre (Argyrosomus regius) produce loud choruses during the breeding season, likely facilitating aggregations and mating, and are thus amenable to being impacted by anthropogenic noise. We assessed the impact of boat noise on this species acoustic communication by: evaluating possible masking effects of boat noise on hearing using Auditory Evoked Potentials (AEP) and inspecting changes in chorus sound levels from free ranging fish upon boat passages. Our results point to a significant masking effect of anthropogenic noise since we observed a reduction of ca. 20 dB on the ability to discriminate conspecific calls when exposed to boat noise. Furthermore, we verified a reduction in chorus energy during ferryboat passages, a behavioural effect that might ultimately impact spawning. This study is one of few addressing the effects of boat noise by combining different methodologies both in the lab and with free ranging animals. | Fundação para a Ciência e Tecnologia - FCT | info:eu-repo/semantics/publishedVersion
Mostrar más [+] Menos [-]Organochlorines and polychlorinated biphenyl environmental pollution in south coast of Rio De Janeiro state Texto completo
2016
da Silva, Ana Maria Ferreira | Pavesi, Thelma | Rosa, Ana Cristina Simões | Santos, Tatyane Pereira dos | de Medeiros Tabalipa, Marianne | Lemes, Vera Regina Rossi | Alves, Sergio Rabello | de Novaes Sarcinelli, Paula
The objective of this study was to evaluate the burden of environmental pollution by Polychlorinated Biphenyls (PCBs) and Organochlorine Pesticides (OCs) in two localities of Rio de Janeiro coast, through the determination of these levels in specimens of mullets and croakers collected from May to August 2008, at Guanabara Bay (GB) and from Araújo Island (AI), at Paraty Bay. Twenty three organochlorine pollutants were detected in croakers at GB and twenty in mullets and all PCBs congeners investigated in the study were present in the two species. Ratio ∑DDT/∑PCB of 1.4 shows an important contribution of agricultural residues in GB and p,p′-DDE/∑DDT of 0.1 demonstrates a reintroduction of DDT. Consumption of mullet may represent a risk to the health of fishermen families from GB, with average and maximum estimated daily intake of ∑DDT of 9.012μg/kg p.c. and 26,174μg/kg p.c., representing 45% and 131% of ADI established by WHO.
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