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| Registros recuperados: 197 | |
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| Fonteneau, Alain; Fromentin, Jean-marc. |
| This communication presents a global overview of Atlantic bluefin tuna biology, exploitation and management. The comparison between bluefin tuna and all other tuna species do show that this species is ranking number one among other tunas world wide in a wide range of its resources and fisheries characteristics. Bluefin tuna is for instance the gold winner in the category of fisheries (about 10,000 years of documented fisheries, the highest price in the market, the largest tuna taken), of its peculiar biology (large migration, homing, growth, etc.) and in the category of risks presently faced by the resource, because of its multiple scientific uncertainties still pending, its increasingly serious statistical problems and the heavy political context in the... |
| Tipo: Text |
Palavras-chave: Pêche; Durabilité; Pêche abusive; Migration; Caractéristique du cycle vital; Fisheries; Sustainability; Overfishing; Migration; Life history trait.. |
| Ano: 2003 |
URL: http://archimer.ifremer.fr/doc/00194/30568/28995.pdf |
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| Artero, C.; Koenig, C. C.; Richard, P.; Berzins, R.; Guillou, G.; Bouchon, C.; Lampert, Luis. |
| The ecology, particularly the trophic ecology, of the Critically Endangered goliath grouper Epinephelus itajara (Lichtenstein 1822) in French Guiana (France) is relatively unknown. Such information would provide a better understanding of the role that goliath groupers play in the marine ecosystem of French Guiana. This study focused on the feeding ecology of the goliath grouper through stomach-content and stable-isotope analyses of captured specimens. The dietary composition of goliath groupers in French Guiana was similar to that of goliath groupers from other areas of the species' range. However, in French Guiana, goliath groupers exhibited an ontogenetic shift in diet that has not been demonstrated elsewhere. Crustaceans, primarily crabs, were dominant... |
| Tipo: Text |
Palavras-chave: Epinephelidae; Critically Endangered species; Stomach contents; Carbon and nitrogen stable isotopes; Dietary shift; Migration; Mangroves · Diet. |
| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00270/38151/36276.pdf |
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| Moguedet, Philippe. |
| During the years 1975, 1976, 1980 and 1982 cod (Gadus morhua) tagging experiments were conducted, inside the Gulf of St. Lawrence and outside in areas south of Newfoundland, by French scientists from IFREMER St. Pierre and Miquelon laboratory, in order to study the population distribution and migration and to complement the experiments carried out by Canadian scientists. The analysis from all recoveries and results from these experiments are presented here. The relevance is that the comparison with the Canadian results would lead to a better understanding of the cod stock exchanges in the area. The migratory patterns were believed to be mainly a response to seasonal environmental condition changes. In winter the cod were noted to migrate from the central... |
| Tipo: Text |
Palavras-chave: Cod; Distribution; Environment; Migration; Northwest Atlantic. |
| Ano: 1994 |
URL: http://archimer.ifremer.fr/doc/00435/54612/55995.pdf |
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| Deveci,Engin; Deveci,Ienay. |
| Leukocyte-endothelial cell interactions have a pivotal role in immune responses. In our study Ten adult wistar albino rats weighing 180-200 g were used to obtain tissue samples. The animals were sacrificed by decapitation under ether anesthesia. The lymph nodes of the animals were then quickly removed. Specimens were immersed in the zinc iodide-osmium tetroxide (ZIO) solutation by Niebauer et al. (1969) and kept in the dark for 2 hours in this solution from temperature for fixation/staining. Samples were processed according to routine plastic embedding tecnique. Semithin sections of 1µm thick were cut and stained with methilene blue-azure II for light microscopic examination. We used zinc iodide-osmium tetroxide staining tecnique to distinguish endothelial... |
| Tipo: Journal article |
Palavras-chave: Leukocytes; Margination; Migration. |
| Ano: 2010 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000300037 |
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| Menasche,Renata; Wedig,Josiane Carine. |
| Tomando como espacio privilegiado de estudio las Fiestas de Familia realizadas entre campesinos, y centrándonos en las categorías con las que el grupo estudiado construye el parentesco y las relaciones en éste implicadas, tratamos de observar cómo, en esos procesos, se ponen de manifiesto elementos que indican una ruralidad valorada. Para la elaboración de este estudio, los datos fueron recogidos a partir de la investigación etnográfica realizada principalmente en una Fiesta de Familia, pero también a partir de narrativas de campesinos en su vida cotidiana y de una serie de folletos, fotos y recuerdos que guardan sobre esas fiestas, en una comunidad rural formada por descendientes de inmigrantes de origen alemán, localizada en Rio Grande do Sul, región... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Campesinado; Campo-ciudad; Familia; Migración; Teuto-brasileños; Peasantry; Countryside-City; Family; Migration; German-Brazilian. |
| Ano: 2014 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1515-59942014000300013 |
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| Outlaw, D.C.. |
| Long-distance migration imposes physiological and morphological selection pressures on birds. The genus Ficedula, a lineage of Old World flycatchers, consists of long- and short-distance migratory species, as well as sedentary species. Members of each of these groups are not reciprocally monophyletic, yet each of the behavioral groups is morphologically distinguishable even when accounting for phylogeny. Long-distance migratory species have more pointed wings than either short-distance migratory or sedentary species, and migratory behaviors and wing pointed-ness are phylogenetically correlated. This suggests that migratory Ficedula species have converged on a migratory phenotype, and that migration may be a selective agent that has shaped the... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Ancestral states; Phylogeny; Migration; Morphology; 42.83. |
| Ano: 2011 |
URL: http://www.repository.naturalis.nl/record/402018 |
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| Campos,Wellington G.. |
| Neotropical populations of the diamondback moth Plutella xylostella L. have seasonal cycles of growth and decrease, and moth migration plays a fundamental role in generating such population dynamics. Since the oscillation of these populations is predictable, photoperiod might operate as a signal that triggers the migratory behaviour of the insect. Migration in insects is usually preceded by reproductive diapause, a photoperiodic response that can be characterised by morphological, physiological and behavioural alterations that permit to discriminate between migratory and non-migratory forms. In this study, I tested whether the pre-imaginal and reproductive development of P. xylostella from Minas Gerais (Brazil) is affected by artificial day-lengths that... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Day-length; Diapause; Migration; Photoperiod; Population dynamics. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2008000400003 |
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| Jaureguizar,Andrés J.; Argemi,Federico; Trobbiani,Gastón; Palma,Elbio D.; Irigoyen,Alejo J.. |
| ABSTRACT Knowledge of the spatial and temporal distribution patterns of chondrichthyans is critical for their effective management. In this study we report and analyze a large-scale latitudinal migration (~ 1,425 km) of a female school shark in the Southwestern Atlantic shelf where it is currently classified as Critically Endangered. During the austral summer (February 15, 2015), ninety-four school sharks were captured (75 females and 19 males) and tagged with fin tags in Nuevo Gulf (~ 42°43’S, 64°53’W, Argentina). A female of 112 cm total length was recaptured in Uruguayan shelf waters in the austral winter (August 17, 2015). This long displacement represents the first direct evidence to support Vooren and Lucifora’s hypothesis of a single transnational... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Argentina-Brazil; Distribution pattern; Habitat preference; Migration; Shelf water. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252018000100201 |
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| Alves,Carlos Bernardo Mascarenhas; Silva,Luiz Gustavo Martins da; Godinho,Alexandre Lima. |
| Jaú, Zungaro jahu (Ihering, 1898), a large migratory catfish endemic to the rio da Prata basin, has a fragile conservation status and its ecology is poorly known. We radio-tracked a female jaú with a total length of 1.5 m that was passed upstream of Funil Dam, rio Grande, to describe its migratory movements, habitat use, linear home range, and diel activity. To track the fish, we made five tracking trips in the period from April, 2003 to January, 2004. In addition to the main body of Funil Reservoir, the fish also used a reservoir-river transition zone located in a branch of Funil Reservoir that flooded part of rio das Mortes. Most of the times, we found the fish in the former beds of streams flooded by the reservoir, at depths that ranged from 8-9 m in... |
| Tipo: Info:eu-repo/semantics/report |
Palavras-chave: Catfish; Endangered species; Migration; Home range; Habitat use. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252007000200018 |
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| Wagner,Ricardo Luiz; Makrakis,Sergio; Castro-Santos,Theodore; Makrakis,Maristela Cavicchioli; Dias,João Henrique Pinheiro; Belmont,René Fuster. |
| This paper presents results of a fishway evaluation performed at the Engenheiro Sérgio Motta Hydroelectric Power Plant (known as Porto Primavera) - CESP, Paraná River, Brazil. The evaluation was designed to quantify entry and passage proportions of 4 long-distance migratory fish species: Brycon orbignyanus (piracanjuba), Piaractus mesopotamicus (pacu), Prochilodus lineatus (curimba), and Rhinelepis aspera (cascudo-preto). Proportions finding and entering the fishway differed between species, ranged from 7.4 % (Prochilodus lineatus) to 55.4% (Piaractus mesopotamicus). Also, proportion passing was different between species, ranged from 31% (R. aspera) to 100% (Prochilodus lineatus). Fish that were marked and released within the fishway had greater failure... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Attraction; Dams; Fish ladder; Fishway; Migration; Swimming performance. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252012000400011 |
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| Alves,Carlos Bernardo Mascarenhas. |
| Rio Paraopeba, a tributary of rio São Francisco, has a six-meter high dam, built in 1978 to divert water to the Igarapé Thermal Power Plant. In 1994, a fish ladder was built at this dam. The results of a marking and recapture program carried out along rio Paraopeba between 1997 and 2001 are described, using information from fish community studies conducted at ten sampling stations between 1994 and 1997. These investigations showed the presence of at least 91 species in the river. During four rainy seasons between 1997 and 2000, fish were caught downstream of the dam, marked with external plastic tags, and immediately released at the same site. The objective was to evaluate fish passage through the ladder, based on recapture information from artisanal and... |
| Tipo: Info:eu-repo/semantics/report |
Palavras-chave: Rio São Francisco basin; Migration; Prochilodus costatus; Leporinus obtusidens; Pimelodus maculatus. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252007000200019 |
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| Registros recuperados: 197 | |
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