Distribuição da Ictiofauna Capturada em Arrastos de Fundo na Baía de Guanabara - Rio de Janeiro, Brasil

In order to describe the composition and the structure of the fish community and to analyze spatial distribution patterns of the most frequent and abundant groups in Guanabara Bay, Rio de Janeiro, Brazil, thirty-seven trawls were accomplished in September 1997, May 1998, April and August 2000, in four areas along the north-south environmental gradient of the bay. Fifty-six species, belonging to 27 families, were captured. The families Sciaenidae, Ariidae, Haemulidae, Dactylopteridae, and Triglidae in this order, were the most abundant. Habitat partitioning of the most abundant populations was observed along the bay. Ariidae, mostly represented by the marine catfish Genidens genidens, prevailed in the inner areas (I and II), with lower depths and salinities. Sciaenidae, of which the whitemouth croaker Micropogonias furnieri was the most abundant species, prevailed in the central area (III), with higher depths while Haemulidae and Dactylopteridae were more abundant in the outermost area (IV), with less turbid and more saline waters, and the lowest content of organic matter in the sediment. The outer areas (III and IV), under oceanic influence, presented the greatest fish abundances and the highest species richness.Com o objetivo de descrever a composição e a estrutura da comunidade de peixes na Baía de Guanabara, Rio de Janeiro, Brasil, e analisar os padrões de distribuição espacial dos grupos mais freqüentes e abundantes, foram realizados 37 arrastos de fundo nos meses de setembro de 1997, maio de 1998, abril e agosto de 2000, em quatro áreas de estudo, ao longo do gradiente norte-sul da baía. Foram identificadas 56 espécies de peixes, pertencentes a 27 famílias. As famílias Sciaenidae, Ariidae, Haemulidae, Dactylopteridae e Triglidae, nesta ordem, foram as mais abundantes. Foi observada a repartição espacial das populações mais abundantes ao longo da baía. A família Ariidae, sendo o bagre Genidens genidens a espécie mais representativa, predominou nas áreas mais internas (I e II), de menor profundidade e salinidade mais baixa. A família Sciaenidae, da qual a corvina Micropogonias furnieri foi a espécie mais abundante, predominou na área central da baía (III), de maior profundidade. Já as famílias Haemulidae e Dactylopteridae foram mais abundantes na área mais externa (IV), com água mais clara e salina e com menor teor de matéria orgânica no sedimento. Maiores valores de abundância e riqueza específica foram observadas nas áreas mais externas, sob maior influência oceânica (áreas III e IV)

Abundance of the reef-building Petaloconchus varians (Gastropoda: Vermetidae) on intertidal rocky shores at Ilha Grande Bay, southeastern Brazil

ABSTRACT The reef-building vermetid Petaloconchus varians occurs in the western Atlantic Ocean, from the Caribbean Sea to the southern coast of Brazil. The present study evaluated the abundance of P. varians on intertidal rocky shores in Ilha Grande Bay (Rio de Janeiro State), and characterized their reefs, describing the species density, besides the weight and the belt width of the reefs. Petaloconchus varians reefs were recorded at 25 sites, with rocky shores exposed to different wave action (very sheltered, sheltered, semi-exposed and exposed) and slopes (10° to 46°). Clusters of individuals constructed large reefs along the middle intertidal zone, creating a wide belt (38 cm to 2 m). The density of P. varians and the weight of the reefs ranged from 620 to 2,559 ind.100 cm-2 and from 100 to 1,500 g.100 cm-2, respectively. Considering that the species was last reported from the area in the mid-20th century, the present study suggests that P. varians reefs are becoming dominant in the intertidal zone of rocky shores in Ilha Grande Bay. This is a contribution to knowledge of this ecosystem in Ilha Grande Bay, in view of local or global ecological changes

Distribui\ue7\ue3o da ictiofauna capturada em arrastos de fundo na Ba\ueda da Guanabara – Rio de Janeiro, Brasil

Volume: 65Start Page: 199End Page: 21

The biology and ecology of the Antarctic limpet Nacella concinna

Made available in DSpace on 2019-09-12T16:53:25Z (GMT). No. of bitstreams: 0 Previous issue date: 2015Instituto Nacional de Ciência e Tecnologia Antártico de Pesquisas Ambientais (INCT-APA)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ)Physiological studies suggest that Antarctic marine organisms are adversely affected by rising global temperatures and ocean acidification and have poor prospects for survival. However, according to ecological studies, their vulnerability might be less severe than initially thought. Thus, a realistic forecast of species survival and Antarctic biodiversity should be based on studies from a variety of species under consideration of ecological factors. The limpet Nacella concinna is often found in the rocky intertidal and sublittoral zones of the Antarctic Peninsula and adjacent subantarctic islands. This review summarizes most of the available information on the biology of this limpet, one of the most conspicuous invertebrates of the intertidal zone. There is some evidence that adult N. concinna are physiologically flexible and can acclimate to 3 A degrees C. However, the requirements of the larval stage are poorly known, thus precluding realistic predictions of how elevated temperatures will affect N. concinna populations. Data on physiological performance (righting ability, tenacity and radula rasping rate) under different temperatures could provide a useful baseline for further field investigations on the effects of warming. The species could be used as model organism for investigating the biological effects of ongoing global warming on slow-growing Antarctic ectotherms. Nacella concinna might also be a better biomonitor for polycyclic aromatic hydrocarbons than other Antarctic mollusks.[Suda, Cecilia N. K.; Vani, Gannabathula S.; de Oliveira, Mariana Feijo; Rodrigues, Edson, Jr.; Rodrigues, Edson; Lavrado, Helena P.] Univ Fed Rio de Janeiro, Natl Inst Sci & Technol Antarctic Environm Res IN, Headquarters, BR-21941902 Rio De Janeiro, RJ, Brazil[Suda, Cecilia N. K.; Vani, Gannabathula S.; de Oliveira, Mariana Feijo; Rodrigues, Edson] Universidade de Taubaté (Unitau), Basic Biosci Inst, BR-12030180 Taubate, SP, Brazil[de Oliveira, Mariana Feijo; Rodrigues, Edson, Jr.] Univ Fed Parana, Dept Cell Biol, BR-81990970 Curitiba, Parana, Brazil[Lavrado, Helena P.] Univ Fed Rio de Janeiro, Dept Marine Biol, BR-21941902 Rio De Janeiro, RJ, Brazi

Interactions of temperature, salinity and diesel oil on antioxidant defense enzymes of the limpet Nacella concinna

Made available in DSpace on 2019-09-12T16:53:39Z (GMT). No. of bitstreams: 0 Previous issue date: 2015Ministério do Meio Ambiente (MMA)Ministério da Ciência, Tecnologia e Inovação (MCTI)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Secretariat of the Inter-ministerial Commission for the Resources of the Sea (SeCIRM)Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ)Instituto Nacional de Ciência e Tecnologia Antártico de Pesquisas Ambientais (INCT-APA)The intertidal and subtidal environments in the Antarctic Peninsula are vulnerable to pollutants, such as diesel oil, a commonly used fuel. Nacelle concinna is capable of accumulating polycyclic aromatic hydrocarbons and is a potential biomonitor of diesel oil contamination. This work investigates the interaction of diesel oil, temperature and salinity on the activity of antioxidants enzymes defense of the gills, foot muscle and digestive glands. Upregulation of superoxide dismutase occurred in the three tissues by warming. The foot muscle catalase and the gill glutathione reductase were upregulated only by diesel. The inability to upregulate catalase and glutathione S-transferase in the digestive gland, as well as the increase of lipoperoxidation, suggested that this gland is more susceptible to the deleterious effects from oxidative stress. (C) 2015 Elsevier Ltd. All rights reserved.[de Oliveira, Mariana Feijo; Rodrigues Junior, Edson; Donatti, Lucelia] Univ Fed Parana, Dept Cell Biol, BR-81530130 Curitiba, Parana, Brazil[de Oliveira, Mariana Feijo; Rodrigues Junior, Edson; Suda, Cecilia N. K.; Vani, Gannabathula S.; Rodrigues, Edson] Universidade de Taubaté (Unitau), Basic Biosci Inst, BR-12030180 Taubate, SP, Brazil[Lavrado, Helena P.] Univ Fed Rio de Janeiro, Dept Marine Biol, BR-21941902 Rio De Janeiro, RJ, Brazi

How Much Is Too Little to Detect Impacts? A Case Study of a Nuclear Power Plant

<div><p>Several approaches have been proposed to assess impacts on natural assemblages. Ideally, the potentially impacted site and multiple reference sites are sampled through time, before and after the impact. Often, however, the lack of information regarding the potential overall impact, the lack of knowledge about the environment in many regions worldwide, budgets constraints and the increasing dimensions of human activities compromise the reliability of the impact assessment. We evaluated the impact, if any, and its extent of a nuclear power plant effluent on sessile epibiota assemblages using a suitable and feasible sampling design with no ‘before’ data and budget and logistic constraints. Assemblages were sampled at multiple times and at increasing distances from the point of the discharge of the effluent. There was a clear and localized effect of the power plant effluent (up to 100 m from the point of the discharge). However, depending on the time of the year, the impact reaches up to 600 m. We found a significantly lower richness of taxa in the Effluent site when compared to other sites. Furthermore, at all times, the variability of assemblages near the discharge was also smaller than in other sites. Although the sampling design used here (in particular the number of replicates) did not allow an unambiguously evaluation of the full extent of the impact in relation to its intensity and temporal variability, the multiple temporal and spatial scales used allowed the detection of some differences in the intensity of the impact, depending on the time of sampling. Our findings greatly contribute to increase the knowledge on the effects of multiple stressors caused by the effluent of a power plant and also have important implications for management strategies and conservation ecology, in general.</p> </div

Map of the location of the CNAAA power plant and the sites sampled.

<p>Effluent (Eff) –100 m far from the discharge point of the power plant; 600 m sites (N600 and S600) – one on each side of the bay, 600 m far from the discharge point; 1400 m sites (N1400 and S1400) – one on each side of the bay, 1400 m far from the discharge point; Control 1 (C1) – the intake area of the cooling system, control area; Control 2 (C2) – located on the East side of Brandão Island, control area.</p