25 results on '"Pascual, Marcela"'
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2. Contributors
- Author
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Aastrup, Peter, primary, Abdel-Daim, Mohamed M., additional, Aburto, Jaime A., additional, Acuña, Alicia, additional, Aguilera, Moisés A., additional, Alemu, Jahson, additional, Aleya, Lotfi, additional, Álvarez-Filip, L., additional, Alyomov, Sergey V., additional, Amara, Rachid, additional, Amouroux, David, additional, Anschutz, Pierre, additional, Arias, Andrés H., additional, Arvanitidis, Christos, additional, Ault, Jerald S., additional, Babatunde, Bolaji Benard, additional, Barros, Vicente, additional, Bazterrica, María Cielo, additional, Béjaoui, Béchir, additional, Bekkby, Trine, additional, Bełdowski, Jacek, additional, Bennett, Rodolfo C., additional, Beszczyńska-Möller, Agnieszka, additional, Bilkovic, Donna Marie, additional, Boero, Ferdinando, additional, Boertmann, David, additional, Borja, Angel, additional, Bortolus, Alejandro, additional, Botté, Sandra E., additional, Bravo, Luis, additional, Broitman, Bernardo R., additional, Brugnoli, Ernesto, additional, Burd, Brenda, additional, Burkholder, JoAnn M., additional, Cahoon, Lawrence B., additional, Calabrese, Sara, additional, Cao, Yiping, additional, Cardoso, Patricia G., additional, Cardoza, Norving J.T., additional, Chiappa-Carrara, Xavier, additional, Chiotoroiu, Brindusa Cristina, additional, Christensen, Tom, additional, Codignotto, Jorge O., additional, Cook, Sarah, additional, Danovaro, Roberto, additional, Dauvin, Jean-Claude, additional, de Frias Martins, Antonio M., additional, De Marco, Silvia G., additional, Delgado, Juan Domingo, additional, Deppeler, Stacy L., additional, Dhib, Amel, additional, Diop, Mamadou, additional, Diop, Cheikh, additional, Dolbeth, Marina, additional, Duman, Muhammet, additional, El Bour, Monia, additional, Ennouri, Rym, additional, Enríquez, Cecilia, additional, Eronat, Hüsnü, additional, Fach, Bettina, additional, Fernández Severini, Melisa D., additional, Fertouna-Bellekhal, Mouna, additional, Fiori, Sandra, additional, Fourqurean, James W., additional, Frigstad, Helene, additional, Fritt-Rasmussen, Janne, additional, Galgani, François, additional, García, Rafael A., additional, Garza-Pérez, R., additional, Gavio, María Andrea, additional, Gaymer, Carlos F., additional, Gelcich, Stefan, additional, Gerpe, Marcela S., additional, Giadom, Ferdinand Dumbari, additional, Giarratano, Erica, additional, Gil, Mónica Noemí, additional, Gobin, Judith, additional, Gómez-Gesteira, Moncho, additional, Góngora, Gongora María Eva, additional, Gore, Shannon, additional, Green, Norman, additional, Grogan, Amy E., additional, Guinder, Valeria A., additional, Gutiérrez, Juan Manuel, additional, Hagen, Anders G., additional, Harman, Christopher, additional, Hatzianestis, Ioannis, additional, Havens, Kirk J., additional, Hedeholm, Rasmus, additional, Helali, Mohamed-Amine, additional, Hershner, Carl H., additional, Holmes, Kieth, additional, Jackson, Jennifer, additional, Jameson, Stephen C., additional, Kapiris, Kostas, additional, Kaste, Øyvind, additional, Kędra, Monika, additional, Khedhri, Inès, additional, Kikuchi, Ruy K.P., additional, Kocak, Ferah, additional, Kucuksezgin, Filiz, additional, Kuliński, Karol, additional, La Colla, Noelia, additional, Leão, Zelinda M.A.N., additional, Lirman, Diego, additional, Logan, Alan, additional, López, Boris A., additional, López Abbate, María Celeste, additional, Lorenz, Jerome J., additional, Lovrich, Gustavo, additional, Mallin, Michael A., additional, Maragou, Panagiota, additional, Marcovecchio, Jorge E., additional, Ismael, Marino-Tapia, additional, Martins, Maria Virgínia Alves, additional, McLaughlin, Karen, additional, Merkel, Flemming, additional, Mitchell, Molly M., additional, Mohammed, Azad, additional, Mohammed, Terry, additional, Montecino, Vivian, additional, Monti, Alejandro J., additional, Moore, Shelly, additional, Morrison, Adele K., additional, Morton, Brian, additional, Mosbech, Anders, additional, Muniz, Pablo, additional, Myers, Andrew, additional, Narvarte, Maite, additional, Oliva, Ana L., additional, Oliveira, Marília D.M., additional, Osadchaya, Tatyana S., additional, Othmani, Achref, additional, Ouddane, Baghdad, additional, Oueslati, Walid, additional, Oug, Eivind, additional, Panayotidis, Panayotis, additional, Papadopoulos, Vassilis P., additional, Papiol, Vanesa, additional, Pascual, Marcela, additional, Pauchard, Aníbal, additional, Pavlidou, Alexandra, additional, Paximadis, Giorgos, additional, Pazi, Idil, additional, Pempkowiak, Janusz, additional, Quintino, Victor, additional, Rabalais, Nancy N., additional, Ramos, Marcel, additional, Rangelov, Miroslav, additional, Raymond, Tania, additional, Relvas, Paulo, additional, Reyes-Hernández, Cristóbal, additional, Riera, Rodrigo, additional, Rigét, Frank, additional, Rioja-Nieto, R., additional, Rivas, Andrés L., additional, Rodríguez, Diego H., additional, Rutllant, José A., additional, Sáez, Claudio A., additional, Sakellariou, Dimitris, additional, Salihoglu, Baris, additional, Salomidi, Maria, additional, Sanger, Denise M., additional, Santos, Rui, additional, Schenke, Ricardo Delfino, additional, Schiff, Kenneth, additional, Sealey, Kathleen Sullivan, additional, Silva, Alexandra, additional, Simboura, Nomiki, additional, Smith, Struan R., additional, Smith, Erik, additional, Sousa, Ronaldo, additional, Spetter, Carla V., additional, Stark, Jonathan S., additional, Stevens, Kara, additional, Szymczycha, Beata, additional, Tagliorette, Alicia, additional, Thiel, Martin, additional, Thomson, Richard, additional, Todorova, Nadezhda, additional, Gonul, Tolga, additional, Trabelsi, Lamia, additional, Trannum, Hilde, additional, Turki, Souad, additional, Turner, R. Eugene, additional, Ugarte, Fernando, additional, Uyarra, María C., additional, Valdés, Luis, additional, Valdivia, Nelson, additional, Vasilev, Vasil, additional, Venturini, Natalia, additional, Warren, Tammy, additional, Wegeberg, Susse, additional, White, Stephanie, additional, Wood, Kathleen, additional, Wynne, Stuart P., additional, Yamashita, Cintia, additional, Zaaboub, Noureddine, additional, Zabbey, Nenibarini, additional, Zaborska, Agata, additional, Zalba, Sergia, additional, and Ziadi, Boutheina, additional more...
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- 2019
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Catalog
3. Reproductive biology of the nonnative oyster, Crassostrea gigas (Thunberg, 1793), as a key factor for its successful spread along the rocky shores of Northern Patagonia, Argentina
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Castanos, Cecilia, Pascual, Marcela, and Camacho, Alejandro Perez
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Patagonia -- Environmental aspects ,Population biology -- Research ,Crassostrea -- Growth ,Oysters -- Growth ,Biological sciences ,Zoology and wildlife conservation ,Company growth ,Research ,Growth ,Environmental aspects - Abstract
ABSTRACT Crassostrea gigas was introduced in Anegada Bay (North Patagonia, Argentina), in 1981 for aquaculture purposes. The species has, since established in the field, covered all available hard substrata in [...] more...
- Published
- 2009
4. Feeding physiology of the Argentine mussel Mytilus edulis platensis (d’Orbigny, 1846): does it feed faster in suspended culture systems?
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Dellatorre, Fernando G., Pascual, Marcela S., and Barón, Pedro J.
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- 2007
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5. No Longer The Pristine Confines of the World Ocean: A Survey of Exotic Marine Species in the Southwestern Atlantic
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(Lobo) Orensanz, Jose Maria, Schwindt, Evangelina, Pastorino, Guido, Bortolus, Alejandro, Casas, Graciela, Darrigran, Gustavo, Elías, Rodolfo, López Gappa, Juan J., Obenat, Sandra, Pascual, Marcela, Penchaszadeh, Pablo, Piriz, María Luz, Scarabino, Fabrizio, Spivak, Eduardo D., and Vallarino, Eduardo A. more...
- Published
- 2002
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6. Diet trials on tehuelche scallop Aequipecten tehuelchus (d'Orb) larvae
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Narvarte, Maite A. and Pascual, Marcela S.
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- 2001
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7. Chapter 34 - Southern Argentina: The Patagonian Continental Shelf
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Gil, Mónica Noemí, Giarratano, Erica, Barros, Vicente, Bortolus, Alejandro, Codignotto, Jorge O., Schenke, Ricardo Delfino, Góngora, Gongora María Eva, Lovrich, Gustavo, Monti, Alejandro J., Pascual, Marcela, Rivas, Andrés L., and Tagliorette, Alicia more...
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- 2019
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8. No Longer The Pristine Confines of the World Ocean: A Survey of Exotic Marine Species in the Southwestern Atlantic
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Oorensanz, Jose Maria, lobo, Schwindt, Evangelina, Pastorino, Guido, Bortolus, Alejandro, Casas, Graciela, Darrigran, Gustavo, Elías, Rodolfo, López gappa, Juan J., Obenat, Sandra, Pascual, Marcela, Penchaszadeh, Pablo, Piriz, María Luz, Scarabino, Fabrizio, Spivak, Eduardo D., and Vallarino, Eduardo A. more...
- Published
- 2002
9. Fertilization, larval rearing and post-larval growth of the Tehuelche scallop Aequipecten tehuelchus D'Orb., 1846
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Narvarte, Maite A and Pascual, Marcela S
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- 2003
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10. Southern Argentina: The Patagonian Continental Shelf
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Gil, Monica Noemi, Giarratano, Erica, Barros, Vicente Ricardo, Bortolus, Alejandro, Codignotto, Jorge Osvaldo, Delfino Schenke, Ricardo, Góngora, María Eva, Lovrich, Gustavo Alejandro, Monti, Alejandro J., Pascual, Marcela Susana, Rivas, Andres Lujan, Tagliorette, Alicia, and Sheppard, Charles more...
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PATAGONIAN COAST ,Oceanografía, Hidrología, Recursos Hídricos ,BIODIVERSITY ,MARINE FRONTS ,ARGENTINE SEA ,CIENCIAS NATURALES Y EXACTAS ,Ciencias de la Tierra y relacionadas con el Medio Ambiente - Abstract
The Southeast South American shelf marine ecosystem extends over the entire continental shelf off the Eastern shores of Argentina, Uruguay and southeastern Brazil (23° to 55°S). The region south of 40ºS is usually known as Patagonian Continental Shelf of Argentina (PCSA). The intertidal environments of the Patagonian shore are among the most diverse of South America in terms of their environmental heterogeneity. The productivity distribution over the continental shelf is also heterogeneous and is concentrated on the marine frontal zones. The Patagonian coast is one of the richest and most productive temperate marine ecosystems in the world. The sea near the Patagonian coast is one of the ocean regions in the world in which smaller changes to its physical variables have been observed. There has been a sea level rise in the region off shore of Patagonia, but the change has been more moderate than the global average. Patagonian coasts of Argentina have only 18 cities, many of them growing rapidly. The population density in this area is below 4 inhabitants / km2. Despite increasing industrial activities in coastal cities in last decades, quality of coastal waters remains high. Argentina has an extensive legislation aimed to controlling marine pollution and protecting biodiversity. Despite the advances of the last decades, more efforts must be done to the effective conservation of marine ecosystems on the Patagonian coast. Fil: Gil, Monica Noemi. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentina Fil: Giarratano, Erica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentina Fil: Barros, Vicente Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Centro de Investigaciones del Mar y la Atmósfera. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Centro de Investigaciones del Mar y la Atmósfera; Argentina Fil: Bortolus, Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico para el Estudio de los Ecosistemas Continentales; Argentina Fil: Codignotto, Jorge Osvaldo. Secretaría de Industria y Minería. Servicio Geológico Minero Argentino; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Delfino Schenke, Ricardo. Fundacion Patagonia Natural; Argentina Fil: Góngora, María Eva. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina Fil: Lovrich, Gustavo Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina Fil: Monti, Alejandro J.. Universidad Nacional de la Patagonia "San Juan Bosco". Facultad de Humanidades y Ciencias Sociales Sede Comodoro. Instituto de Investigaciones Geográficas de la Patagonia; Argentina Fil: Pascual, Marcela Susana. Universidad Nacional de la Patagonia "San Juan Bosco". Facultad de Humanidades y Ciencias Sociales Sede Comodoro. Instituto de Investigaciones Geográficas de la Patagonia; Argentina Fil: Rivas, Andres Lujan. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentina. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina Fil: Tagliorette, Alicia. Fundacion Patagonia Natural; Argentina. Universidad Nacional de la Patagonia Austral; Argentina more...
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- 2019
11. Water quality and zooplankton monitoring at the seawater circuit of a mollusk hatchery
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Hoffmeyer, Monica Susana and Pascual, Marcela
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Ciencias Biológicas ,purl.org/becyt/ford/1 [https] ,SEAWATER SUPPLY CIRCUIT ,ZOOPLANKTON ,BIOMONITORING ,MOLLUSK HATCHERY ,Ecología ,purl.org/becyt/ford/1.6 [https] ,CIENCIAS NATURALES Y EXACTAS - Abstract
Seawater quality in mollusc hatcheries has been identified as one topic of high concern because of its implications in larval performance. This aspect, however, has received little or no attention from the scientific point of view. The only literature about this topic is a general compilation about water quality for aquaculture systems (Anonymous 1977). This gap in the available information may be mainly that periodic adjustments performed in hatcheries are routine protocols, the results of which are filed as internal reports and seldom reach the scientific literature. Research done on this subject has dealt primarily with water quality and the composition of effluents from hatcheries and other aquaculture systems and their potential reuse for other purposes, such as agriculture and he culture of secondary aquatic organisms (Van Rijn 1996, Lin et al. 2002) There have also been studies associated with the effects of different treatments of seawater aimed at improving the quality of bivalve larvae (Utting et al. 1983, Chen 1984, Jaeckle and Manahan 1989). Our study was triggered by the occasional finding of different types of plankton, mainly copepod microcrustaens, in the water used for larval culture in a mollusc hatchery. The assessment of water quality and biota throughout the entire water circuit was undertaken to improve the intake system and the treatment methods employed in conjunction with the water that circulates within the hatchery. This study is the first of its kind performed in Argentina. We present here the results of a survey performed during a year in the hatchery during which water quality was monitored with regard to its physical and chemical properties, including temperature, salinity, pigments, organic matter. Planktonic species richness and total abundance, species abundance and the presence of non-planktonic organisms were also assessed Fil: Hoffmeyer, Monica Susana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Argentino de Oceanografía. Universidad Nacional del Sur. Instituto Argentino de Oceanografía; Argentina Fil: Pascual, Marcela. Universidad Nacional del Comahue. Instituto de Biologia Marina y Pesquera Almirante Storni; Argentina more...
- Published
- 2006
12. No longer the pristine confines of the world ocean: a survey of exotic marine species in the southwestern Atlantic
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Lobo Oresanz, José María, Schwindt, Evangelina, Pastorino, Guido, Bortolus, Alejandro, Casas, Graciela, Darrigran, Gustavo Alberto, Elías, Rodolfo, López Gappa, Juan José, Obenat, Sandra, Pascual, Marcela, Penchaszadeh, Pablo, Piriz, María Luz, Scarabino, Fabrizio, Spivak, Eduardo D., and Vallarino, Eduardo A. more...
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invasions ,southwest Atlantic ,Argentina ,estuarine ,exotics ,Patagonia ,Ciencias Naturales ,marine ,Uruguay - Abstract
We conducted a comprehensive survey of existing knowledge about exotic marine organisms introduced to the southwestern Atlantic Ocean, including coastal and shelf areas of Uruguay and Argentina. This domain is equivalent to the so-called Patagonian Shelf Large Marine Ecosystem, and corresponds to two biogeographic provinces: warm-temperate (Argentine Province) and cold temperate (Magellanic Province). The search included species that can be confidently categorized as introduced (31) and cryptogenic species (46). We present a comprehensive picture of recorded introductions (the first for this region) and some prominent ecological consequences. Most coastal ecosystems between the La Plata River estuary and central Patagonia have already been modified, or are expected to be so in the short term. Five recent, human-mediated biological invasions have already had a significant ecological impact. A barnacle (Balanus glandula) belt has developed on all rocky shores where none was present 30 years ago, a macro-fouler (Limnoperna fortunei) and a reef-builder (Ficopomatus enigmaticus) have strongly modified estuarine ecosystems, Pacific oyster (Crassostrea gigas) reefs are expanding in shallow bays at a fast rate, and kelp (Undaria pinnatifida) is rapidly modifying nearshore benthic communities along the coasts of central Patagonia. At this point, it is uncertain how many of the cordgrasses (Spartina spp.) found in coastal salt marshes correspond to exotic forms. Only exposed sandy beaches appear to be free from the pervasive ecological impact of invasion by exotic species. Poor knowledge of the regional biota makes it difficult to track invasions., Facultad de Ciencias Naturales y Museo more...
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- 2002
13. Reproductive Biology of the Nonnative Oyster,Crassostrea gigas(Thunberg, 1793), as a Key Factor for Its Successful Spread Along the Rocky Shores of Northern Patagonia, Argentina
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Castaños, Cecilia, primary, Pascual, Marcela, additional, and Camacho, Alejandro Pérez, additional
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- 2009
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14. Systematic, taxonomic and biogeographic relationships of Argentine flat oysters
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Shilts, Meghan H., Pascual, Marcela S., and Ó Foighil, Diarmaid
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- 2007
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15. Testing of the Argentina oyster, Ostrea puelchana, in several French oyster farming sites
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Pascual, Marcela, Martin, Anne-genevieve, Zampatti, Eduardo, Coatanea, Denis, Defossez, Jérôme, and Robert, Rene
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Parasitologie ,Oysters ,Marteilia refringens ,Ostrea puelchana ,food and beverages ,Parasitology ,Huître ,geographic locations - Abstract
Because of diseases affecting fIat oyster Ostrea edulis, acclimatization of the Argentina oyster Ostrea puelchana has been tested in 1989-90 in five French oyster farming sites. Following ICES recommendations , hatchery produced juveniles, from parents imported from Argentina, were transferred to experimental si tes in summer 1989. Very high mortalities occurred, reaching 46 to 98% in March-Apri1 1990. They continued later on, resulting in the end of experiments in March 1991. The growth of surviving oysters was relatively poor in comparison of the local species. Parasites Marteilia refringens and Bonamia ostreae have been detected but at rates inadequate ta explain the high mortalities. AlI these results lead not to retain this species for breeding on French coasts, En raison des parasitoses sévissant actuellement sur l 'huître plate Ostrea edulis, des essais d'acclimatation de l'huître argentine Ostrea puelchana ont été réalisés en 1989-90 dans cinq secteurs ostréicoles français. Après production en écloserie à partir de géniteurs importés d'Argentine, dans le respect des recommandations du C.I.E.M., les juvéniles ont été répartis sur site en été 1989. De très fortes mortalités se sont déclarées, atteignant 46 à 98 % dès mars-avril 1990. Elles se sont poursuivies par la suite entraînant l'arrêt des essais en mars 1991. La croissance des survivantes s'est révélée relativement médiocre en comparaison de l'espèce locale. Les parasites Marteilia refringens et Bonamia ostreae ont été décelés à plusieurs reprises mais à des taux insuffisants pour expliquer les fortes mortalités. L' ensemble de ces résultats conduit à ne pas retenir cette espèce pour élevage sur les côtes françaises. more...
- Published
- 1991
16. Carriage of dwarf males by adult female puelche oysters: the role of chitons
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Pascual, Marcela S, primary
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- 1997
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17. Evidence of a chemically mediated adult-larval interaction triggering settlement in Ostrea puelchana: applications in hatchery production
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Pascual, Marcela S., primary and Zampatti, Eduardo A., additional
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- 1995
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18. An uncommon oyster breeding system in a Late Tertiary Patagonian species
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IRIBARNE, OSCAR O., primary, PASCUAL, MARCELA S., additional, and ZAMPATTI, EDUARDO A., additional
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- 1990
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19. POPULATION STRUCTURE AND DEMOGRAPHY OF THE PUELCHE OYSTER (OSTREA PUELCHANA D'ORBIGNY, 1841) GROUNDS IN NORTHERN PATAGONIA, ARGENTINA.
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Pascual, Marcela S., Zampatti, Eduardo A., and Iribarne, Oscar O.
- Abstract
Presents information on a study which examined the population structure and demography of flat oyster, Ostrea puelchana, grounds in Northern Patagonia, Argentina. Features of the ostrea pulchana; Materials and methods; Results and discussion. more...
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- 2001
20. DWARF MALES IN THE PUELCHE OYSTER (OSTREA PUELCHANA, D'ORB.): DIFFERENTIAL MORTALITY OR SELECTIVE SETTLEMENT?
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Pascual, Marcela
- Abstract
Ostrea puelchana is the only ostreid for which a "dwarf male" phenomenon has been described. Adult females (>55 mm) "carry" small individuals settled on a expansion of the anterior margin of the concave shell. This phenomenon co-occurs with sex reversal. These small oysters mature as males and have their growth severely retarded as a result of interaction with the carrying female oyster. The non-random distribution of small males is, at least in part, a consequence of the higher survival rate of settlers on the platform of adult females, where they are sheltered from the foraging activities of chitons. In the present work "carriage" was studied in wild oysters from three natural grounds and in farmed oysters. The results show that in farmed oysters, carriage begins at a larger size than in wild oysters, suggesting that the attraction effect exerted by the adult oysters on the larvae ready to settle is related to age rather than to the size of the oyster. Settlement is constrained by the previous occupation of the platform. The settlement and/or survival of new recruits is inversely related to the presence and size of previous recruits. Recruitment on dead and living oysters, and the settlement of O. puelchana larvae on adults of O. puelchana and O. edulis were experimentally assessed. The results of both experiments suggest: (1) the specificity of the carriage phenomenon and (2) the existence of an active selection of the platform by the larvae. Thus, the carriage phenomenon may be explained by two simultaneous mechanisms: the selective mortality of recruits settled on the shells, and the differential larval settlement through a process of active selection. [ABSTRACT FROM AUTHOR] more...
- Published
- 2000
21. Clave para el reconocimiento de los géneros de algas macrofitas del intermareal rocoso bonaerense
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Parma, Ana, Pascual, Marcela S., and Sar, Eugenia Alicia
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Macroalgas bentónicas ,BOTANICA ,Miramar ,Santa Clara del Mar ,Algas macrofitas - Abstract
Fil: Parma, Ana. Instituto de Biología Marina y Pesquera Almirante Storni. Río Negro; Argentina Fil: Pascual, Marcela S.. Instituto de Biología Marina y Pesquera Almirante Storni. Río Negro; Argentina Fil: Sar, Eugenia Alicia. División Ficología. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; Argentina more...
- Published
- 1987
22. Consideraciones ecológicas sobre las algas del litoral bonaerense
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Sar, Eugenia Alicia, Pascual, Marcela S., and Parma, Ana
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Chlorophyta ,BOTANICA ,Rhodophyta ,Phaeophyta - Abstract
Fil: Sar, Eugenia Alicia. División Ficología. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; Argentina Fil: Pascual, Marcela S.. Instituto de Biología Marina y Pesquera Almirante Storni. Río Negro; Argentina Fil: Parma, Ana. Instituto de Biología Marina y Pesquera Almirante Storni. Río Negro; Argentina more...
- Published
- 1984
23. Larval rearing, nursery growing and implantation at oyster parks of the Argentinian oyster, Ostrea puelchana d'Orb
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Zamapatti, Eduardo and Pascual, Marcela
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The present work has been done in the frame of the mutual interest of both counlries concerning the development and enhancement of commercial oyster production. The French interest is focused on testing the resistance of alternative nonindigenous flat oyster species to the parasitic infections affecting the european O. edulis. The Argentinian interest is directed towards the training of local researchers in hatchery rearing as a future productive alternative for this species. The present work briefly reports the results of the transport and maturation of a stock of Argentinian oysters, larval rearing and nursery growing of juveniles at the hatchery of L.P.G.I.M. (IFREMER) La Tremblade and at a private nursery, and the implantation of the species in oyster parles at differems points of the French coast. more...
- Published
- 1989
24. Female-male interaction in the breeding system of the puelche oyster Ostrea puelchana d'Orbigny
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Pascual, Marcela S., primary, Iribarne, Oscar O., additional, Zampatti, Eduardo A., additional, and Bocca, Adrian H., additional
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- 1989
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25. Patterns and processes of the population dynamics of the puelche oyster, Ostrea puelchana, (D´Orbigny, 1842)
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Doldan, María del Socorro, Morsan, Enrique Mario, and Pascual, Marcela Susana
- Abstract
La detección de los patrones y procesos ecológicos depende de la escala deanálisis. Los bivalvos marinos conforman, por lo general, metapoblaciones,conformadas por poblacionales locales discontinuas conectadas entre símediante el flujo de larvas pelágicas. La existencia de estadios larvariospelágicos es un rasgo de la historia de vida que puede generar patronesespaciales complejos que son modificados por procesos que operan a la escalade las poblaciones locales. Las fluctuaciones que experimentan las poblacionespueden ser comprendidas analizando estos patrones y procesos poblacionales ala escala espacial en la que efectivamente ocurren i) a macroescala: abarcandola dinámica del conjunto de poblaciones locales discontinuas que conforman lametapoblación. Los procesos a esta escala comprenden el grado de conectividadentre los bancos; ii) a mesoescala: la escala de población local, dentro de unametapoblación; el énfasis radica en el cambio del tamaño poblacional en tiempoy espacio; iii) a microescala: es el área de influencia de cada individuo, dondetienen lugar procesos denso-dependientes. El objetivo general de este trabajo fue estudiar los patrones y procesospoblacionales de la ostra puelche Ostrea puelchana bajo la perspectiva de talesescalas espaciales. Para ello, se abordaron aspectos de la historia de vida de lasostras, de la demografía de los bancos, y de la comunidad de la cual formanparte. Han sido estudiadas las fluctuaciones temporales y espaciales de lospatrones de distribución de las densidades de ostras en cada banco, lastendencias geográficas de procesos como reclutamiento, portación de machosepibiontes y agregaciones en manojos, las estructuras demográficas (aparente yreal), la composición de las comunidades bentónicas, y el efecto deinteracciones interespecíficas, de los bancos de ostras del Golfo San Matías (GSM) y del Golfo San José (GSJ). Históricamente, la distribución de la ostra plana nativa, O. puelchana, ha sidomencionada desde Santa Catarina, sur de Brasil, hasta el GSM. Sin embargo,estudios recientes han reportado su presencia en latitudes mayores, indicandouna expansión de las poblaciones de O. puelchana hacia el sur durante lasúltimas décadas. El límite sur actual de la distribución de O. puelchana resultóser el GSJ, donde esta especie conforma bancos de densidades bajas. La reconstrucción de la presencia de O. puelchana en el GSM se realizó a partirde cuatro fuentes de información, que abarcan períodos muy distintos: elregistro fósil en el Holoceno, documentación sobre yacimientos arqueológicos,documentación de las primeras campañas de exploración (iniciadas a finales desiglo XIX y primera mitad del siglo XX) y bases de datos de las prospeccionesecológico-pesqueras realizadas en la zona entre 1970-2006. La presencia deostras subfósiles del Holoceno en los cordones arenosos de la costa de Puerto Lobos indica que el rango de distribución geográfica en el pasado pudo habersido similar al actual. Los registros de fin de siglo XIX de esta especie en el GSM, permitieron conformar la persistencia espacial a largo plazo de los bancos. Esta persistencia ocurre a pesar de las fluctuaciones poblacionales, a causa defactores ambientales, biológicos, socio-económicos y antropogénicos. Losbancos de O. puelchana de la costa NO del GSM han experimentado unacontracción en los últimos años, con reducción de su abundancia. Por elcontrario, los bancos de la costa NE se han consolidando durante los últimos 20años, experimentando una expansión a lo largo de toda la costa, desde Punta Villarino hasta Caleta de los Loros. La coherencia geográfica en la expansión delos bancos de ostras podría reflejar condiciones adecuadas generales para lasupervivencia de las larvas a largo plazo, al menos en la costa NE. Los bancosde la costa NO mostraron un patrón de contracción a menor escala espacial quecontrasta con esta coherencia geográfica de expansión de la metapoblación, locual indicaría la influencia de otros procesos. Se realizaron prospecciones en cinco bancos del GSM (Banco Reparo, Las Grutas, El Sótano, Bajo Oliveira y Caleta de los Loros), y se analizaron muestrasde los bancos de Sierra Grande, Puerto Lobos y de Playa Fracasso, del GSJ. Entotal, unas 5181 ostras fueron medidas y pesadas. A mesoescala, se observaroncambios en la estructura de los bancos de la costa NO, con disminución de ladensidad, coincidentes con la reducción de su extensión. Sin embargo, algunosbancos muestran signos de recuperación. La estructura demográfica de O.puelchana tiene una dinámica que se adapta ante los cambios, como ha sido laepizootia por Bonamia exitiosa a mediados de 1990, entre otros. En la costa NE,pareciera continuar la tendencia de aumento y expansión de los bancos. Se exploraron varias técnicas para la determinación de edad de esta especie:cortes delgados de valvas, moldes de acetato, marcado de valvas con calceína,radiografías, cátodoluminiscencia e isótopos estables. El empleo de la técnica decátodoluminiscencia, combinada con el análisis de isótopos estables del oxígeno,resultó exitoso en la elucidación del patrón de depositación de la valva en estaespecie. La implementación combinada de estas técnicas resulta novedosa, yaque constituye la primera aplicación en moluscos marinos en nuestro país. O.puelchana es una especie sensible a los cambios estacionales de su ambiente,respondiendo a éstos con la depositación de líneas de calcita caliza, durante losmeses cálidos (diciembre a marzo). La cantidad de líneas observadas dependióde la talla y de las condiciones ambientales locales de cada sitio, por lo cual nose puede atribuirles a estas líneas el carácter de marcadoresesclerocronológicos. Los componentes faunísticos de los bancos de O. puelchana fueron estudiadosmediante técnicas uni y multivariadas, siguiendo tres perspectivas diferentes: i)analizar las probables diferencias en la composición y diversidad de lascomunidades entre bancos con condiciones diferentes; ii) analizar las diferenciasentre bancos de la diversidad de especies que utilizan a la ostra como sustrato,y analizar a ésta como probable organismo estructurador del ambiente. Losbancos de ostra puelche conforman sistemas biodiversos, constituyendo unensamble único, sin diferencias entre bancos, caracterizado por una dominanciade unas pocas especies. O. puelchana resultó ser un importante sustrato deasentamiento de especies epibiontes. La conformación de manojos noincrementó la diversidad de epibiontes de manera significativa, con respecto alas ostras libres. La probabilidad de albergar epibiontes aumentaría con la edad,o sea, con el tiempo de exposición a este poblamiento. Se analizó el efecto sobre O. puelchana de distintas interaccionesinterespecíficas a microescala. La presencia del cangrejo comensal Tumidotheres maculatus dentro de O. puelchana, cuya frecuencia varía entrebancos, redujo el índice de condición de las ostras hospedadoras. La infecciónpor Lithophaga patagonica también varió entre bancos. Las ostrasdesencadenarían una reacción defensiva contra las perforaciones de L.patagonica que sería efectiva una vez que éstas alcanzan la superficie interiorde la valva. Las densidades actuales de los quitones del género Chaetopleurasugieren que la regulación post-asentamiento que éstos ejercen sobre lasposlarvas mediante el ramoneo opera en todos los bancos de ostras del GSM. Los bancos de O. puelchana del GSM constituyen una metapoblación vinculadamediante deriva de larvas. La dinámica poblacional de O. puelchana es lenta,con una baja resiliencia, en la cual se requieren de al menos 20 años hasta laaparición de signos de recuperación a posteriori de un evento devastador comofue el que ocasionó la epizootia producida por B. exitiosa a mediados de 1990. Este mismo lapso de tiempo es el que requirió el establecimiento de bancos enel GSJ. The detection of ecological patterns and processes depends on the scale ofanalysis. Bivalve molluscs usually form metapopulations, formed by localpopulation interconnected by flow pelagic larvae. The existence of pelagic larvalstages is a feature of the life history that can generate complex spatial patternsthat are modified by processes that operate at the scale of local populations. Fluctuations experienced by populations can be understood by analyzing thesepatterns and population processes to the spatial scale at which they do occur: i)macroscale: it encompasses the dynamics of the set of discrete localpopulations that make up the metapopulation. The processes at this scaleinclude the degree of connectivity between beds, ii) mesoscale: the scale of thelocal population within a metapopulation; the emphasis focus on the change ofpopulation size in time and space; iii) microscale: is the area of influence ofeach individual, within which density-dependent processes ocurrs. The aim of this work was to study the patterns and processes of the populationof the puelche oyster Ostrea puelchana through the perspective of spatialscales. Different aspects of the life history of oysters, the demography of theoyster beds, and the oyster community were analyzed. Temporal and spatialfluctuations of the distribution patterns of oyster densities, the geographictrends of processes such as recruitment, dwarf-males carring and clusteraggregation patterns, demographic structures (apparent and real), the benthiccommunity composition, and the effect of interspecific interactions, have beenstudied in each oyster bed of San Matías Gulf (SMG) and San José Gulf (SJG). Historically, the distribution of the native flat oyster, Ostrea puelchana has beenmentioned from Santa Catarina, southern Brazil, to the SMG. However, recentstudies have reported its presence at higher latitudes, indicating a southwardexpansion of the O. puelchana populations during the last decades. The currentsouthern boundary distribution of O. puelchana is the SJG, where the speciesforms low densities beds. Reconstruction of the occurrence of O. puelchana in SMG was made using foursources, each covering different periods: the fossil record from the Holocene,archaeological documentation, documentation of the early exploration surveys (from the late XIX century to the early XX) and the information from fishing andscientific surveys conducted between 1970-2006. The occurrence of oysterssubfossils from the Holocene at the sand ridges on the coast of Puerto Lobosindicates that the geographic distribution range in the past may have beensimilar to the current. The records of this species from the late century XIX inthe SMG, helped establishing the long-term spatial persistence of beds. Thispersistence occurs despite the population fluctuations due to environmental,biological, socio-economic and anthropogenic factors. O. puelchana beds fromthe NW coast of the GSM experienced a contraction in recent years, with areduction of the abundance. By contrast, the NE coast beds have strengthenedover the last 20 years, showing an expansion along the coast, from Punta Villarino to Caleta de los Loros. Geographic consistency in the expansion of theoyster beds may reflect a general environment of suitable conditions for longtermlarval survival (at least in the NE coast). On the contrary, beds of the NWcoast showed a pattern of contraction at a lower spatial scale that contrastswith this geographical coherence of the metapopulation expansion, suggestingthe influence of other processes. Surveys were conducted in five SMG beds (Bank Reparo, Las Grutas, The Sótano, Bajo Oliveira and Caleta de los Loros), and samples from Sierra Grande, Puerto Lobos and Playa Fracasso (GSJ) beds were analyzed. Together, about 5181 oysters were measured and weighed. Changes in the structure of NW bedswere observed at a mesoscale, with a decreasing trend in the density, togetherwith the reduction of its extension. However, some bed showed signs ofrecovery. The demographic structure of O. puelchana has a plastic dynamicadaptable to changes, as the case of the Bonamia disease by Bonamia exitiosain mid-1990, among others. In the NE coast, the trend of expansion of bedsseems to continue. We explored several techniques for age determination of this species: thinsections of shell, acetate peels, shell calcein marking, x-rays,cathodoluminescence and stable isotopes. The use of cathodoluminescencetechnique, combined with the analysis of stable isotopes of oxygen, wassuccessful in elucidating the depositional pattern of the shell in this species. Thecombined implementation of these techniques is a noveltyl, as it is the first casein application in marine molluscs in our country. O. puelchana senses theseasonal changes of the environment, responding to them with the deposition ofa chalky calcite band, during the warmer months (from December to March). The number of bands observed depended on the oyster size and localenvironmental conditions of each bed, so we cannot consider these bands the assclerochronological markers. The faunal components of O. puelchana beds were studied by univariate andmultivariate techniques, using three different perspectives: i) analyzing thedifferences in the community composition and diversity between beds withdifferent environmental conditions, ii) analyzing the differences in the diversityof species that use the oyster as a substrate between beds, and evaluating if O.puelchana is an environment structuring organism. The puelche oyster bedsform a single diverse system, showing no differences between beds. Beds aredominated by a few species. O. puelchana proved to be an important substratefor settlement of epibionts species. Clusters did not increase significantly theepibionts diversity. The probability of harboring epibionts increases with age, orwith the time of exposure to them. The effect of interspecific interactions on O. puelchana at microscale wasstudied. The presence of commensal Tumidotheres maculatus within oysters,varied between beds. This crab reduced the condition index of the oysters. Lithophaga patagonica infection also differed between beds. Oysters trigger adefensive reaction against Lithophaga patagonica which is effective once theyreach the inner surface of the shell. Current densities of chitons of the genus Chaetopleura suggest that the post-settlement regulation that they have overthe postlarvae operates in all GSM beds oyster. O. puelchana beds form a metapopulation linked by larval drift. The populationdynamics of O. puelchana is slow, with low resilience, which requires at least 20years before the first signs of recovery appear, as it occurred after a drasticevent caused by B. exitiosa disease in mid-1990. This same time period wasrequired for the establishment of beds in the GSJ. Fil: Doldan, María del Socorro. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. more...
- Published
- 2013
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