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| Silva,André T. da; Zina,Juliana; Ferreira,Fabio C.; Gomiero,Leandro M.; Goitein,Roberto. |
| ABSTRACT We evaluated how seasonality affects the frequency and intensity of fin-nipping, as well as the fish prey preferences of Serrasalmus maculatus Kner, 1858. The study took place in a small reservoir of the Ribeirão Claro River basin, state of São Paulo, southeastern Brazil. Fish were sampled monthly from July 2003 to June 2004, using gillnets. Sampling consisted of leaving 50 m of gillnets in the water for approximately 24 hours each month. No seasonal variation in the frequency and intensity of fin-nipping was observed. Among six prey species, piranhas displayed less damage in their fins, possibly due to intraspecific recognition. Under natural conditions, the caudal fins of Cyphocharax modestus (Fernández-Yépez, 1948) were the most intensively... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Community dynamics; Human activities; Mutilation; Prey-predator interaction; Ribeirão Claro River. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702015000600457 |
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| Gastauer,Markus; Meira Neto,João Augusto Alves. |
| Ecological theory predicts that, in mature ecosystems, species richness, the number of individuals and the biomass of individuals will remain in a relatively stable state of equilibrium. The aim of this study was to test that theory. In 2001 and 2010, we conducted censuses of all trees with a circumference at breast height > 10 cm in a one-hectare plot in a seasonal semideciduous old-growth forest in southeastern Brazil. We compared the two censuses in terms of species richness and diversity, computing growth, recruitment and mortality rates, as well as gains and losses of basal area. Between 2001 and 2010, species richness declined from 224 to 218 species and the basal area increased from 37.86 to 40.16 m² ha-1. Overall turnover (the mean... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Community dynamics; Habitat loss; Immigration rate; Landscape fragmentation; Species richness. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000200004 |
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| Blanchard, Fabian. |
| Species diversity variations between the demersal fish assemblages of the Bay of Biscay (Atlantic Ocean) and of the Gulf of Lions (Mediterranean Sea) are analysed on a decade scale. The aim of this study is to interpret the dynamics of these two communities characterised by different level of fishing intensity. Data come from trawl surveys carried out for the direct evaluation of the demersal stocks abundance from 1983 to 1997. Diversity indices used are the Hill's indices N1 and N2, the species richness S, the evenness J', the K-dominance curves and the life strategy of the dominant species. Three demersal fish assemblages are defined in the community of the Bay of Biscay and in that of the Gulf of Lions: coastal, continental shelf, and continental slope.... |
| Tipo: Text |
Palavras-chave: Gulf of Lions; Bay of Biscay; Demersal fish; Community dynamics; Species diversity. |
| Ano: 2001 |
URL: http://archimer.ifremer.fr/doc/2001/publication-1393.pdf |
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| Blanchard, Fabian; Le Loc'H, Francois; Hily, Christian; Boucher, Jean. |
| Within the framework of the 'dynamic equilibrium model', we tested the hypothesis that fishing causes major disturbance to benthic communities on deeper bottoms of the continental shelf. Benthic megafauna on the Bay of Biscay coast of France was sampled on fishing grounds subject to various conditions of exploitation. Samples were taken at around 100 m depth to avoid strong natural disturbances. Species diversity and the largest body mass class of invertebrates were smaller in strongly exploited areas than in moderately exploited ones. Biomass size spectra in strongly exploited areas were characterised by a comparatively large biomass of small invertebrates, hence the K-dominance curve of abundance was either above the biomass curve, or the curves... |
| Tipo: Text |
Palavras-chave: Benthic communities; Community dynamics; Disturbance; Diversity; Size spectrum. |
| Ano: 2004 |
URL: http://archimer.ifremer.fr/doc/00000/10896/7578.pdf |
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| Sarrazin, Jozee; Blandin, Jerome; Delauney, Laurent; Dentrecolas, Stephane; Dorval, Philippe; Dupont, Jacky; Legrand, Julien; Leroux, D.; Leon, Pierre; Leveque, Jean-jacques; Rodier, Philippe; Vuillemin, Renaud; Sarradin, Pierre-marie. |
| The major goal of this project, elaborated in the frame of the STREP Exocet/D European project, was to design a first autonomous long-term imaging module equipped with a deep-sea video camera, adequate lightning and sufficient energy storage while taking advantage of most recent progress in imaging and photonics. The new ecological module TEMPO was tested and deployed during the Momareto cruise held from August 6 to September 6, 2006 on the new French oceanographic vessel Pourquoi pas?, with the ROV Victor 6000. The scientific objectives of the Momareto cruise were to study the spatial and temporal dynamics of hydrothermal communities colonizing the MoMAR zone, located on the Azores Triple Junction. |
| Tipo: Text |
Palavras-chave: Community dynamics; Deep-sea; Imagery; Monitoring. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-3597.pdf |
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