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DIALNET OAI Articles (510.216 recursos)
Dialnet (Difusión de Alertas en la Red) es una plataforma de recursos y servicios documentales, cuyo objetivo fundamental se centra en mejorar la visibilidad y el acceso a la literatura científica hispana a través de Internet.

Geociencias. Medio ambiente

Mostrando recursos 1 - 20 de 30.298

1. Nutrient limitation of phytoplankton growth and physiology in a subtropical estuary (Pensacola Bay, Florida) - Juhl, Andrew R.; Murrell, Michael C.
Phytoplankton nutrient limitation was studied in a sub-estuary of lower Pensacola Bay using multiple techniques in parallel. Nutrient-addition bioassays indicated year-round nutrient limitation, in contrast to seasonal patterns often described for higher-latitude estuaries. Although an earlier study found frequent P-limitation in Pensacola Bay, N-limitation dominated during this study, despite dissolved inorganic N:P ratios consistently above Redfield proportions. However, combined N and P additions enhanced phytoplankton growth more than single nutrients, indicating incipient co-limitation. In-situ alkaline phosphatase (Pase) activity was not clearly related to inorganic nutrient concentrations or ratios. however, changes in Pase activity after nutrient additions were consistent with the...

2. Short-term dispersal of an intentionally-released patch of larval Mercenaria Spp. in the Indian River Lagoon, Florida, USA - Hitchcock, Gary L.; Arnold, William S.; Frischer, Marc; Kelble, Christopher; Cowen, Robert K.
In July 1998 approximately 2.5 × 108 of recently-spawned Mercenaria spp. larvae were intentionally released in the northernmost basin of the Indian River Lagoon, Florida, to characterize the initial dispersion from a point source at time scales of hours to days. Larval densities measured with a quantitative molecular method indicated ambient concentrations were enhanced by 10 larvae L-1 near surface drifters released with the larvae. Surface distributions from samples collected near the drifters indicate that larval patches developed during the first day. diffusive processes evaluated from dye releases yield apparent diffusivity coefficients that suggest diffusive processes could spread larvae over...

3. Description of a new northeastern Atlantic aeolid of the genus Flabellina (Mollusca, Nudibranchia) - González-Duarte, Manuel M.; Cervera Currado, Juan Lucas; Poddubetskaia, Marina
A new species of aeolid nudibranch of the genus Flabellina Voigt, 1834 is described from the Bay of Arcachon (France), in the northeastern Atlantic. This species is cryptic of the aeolid Piseinotecus gaditanus Cervera, García and García, 1987. The external appearance is identical to P. gaditanus: body color is translucent white, ceratal surface transparent, digestive gland duct bright red and apex translucent white. The cerata arise from peduncles arranged in groups of five to seven, and opaque white spots are scattered all over the cerata surface. The radula is triseriate and the rachidian tooth has a triangular central cusp. The...

4. Genetic divergence among sympatric populations of three species of oyster drills (Urosalpinx) in Cedar Key, Florida - Robinson, John D.; Dillon, Robert T.
Three gastropod species of the genus Urosalpinx inhabit intertidal and subtidal regions of the southeastern United States. Urosalpinx cinerea (Say, 1822) is native to the Atlantic coast from Newfoundland to northeast Florida, while Urosalpinx perrugata (Conrad, 1846) and Urosalpinx tampaensis (Conrad, 1846) are largely restricted to the Gulf of Mexico. The morphological similarity of U. cinerea and U. perrugata is so striking that they have been suggested to be subspecies. We used a combination of molecular and morphological methods to examine divergence among populations of these three nominal species in a newly discovered area of sympatry: Cedar Key, Florida. Significant...

5. Un fenómeno "exótico" para la tradición "basca": la incorporación del "foot-ball" en el nacionalismo cultural vasco - Molnar, Peter

6. Ciencias cognitivas: un desafío de nuestros días en el ambito de las ciencias sociales - Castro Aguirre, Constancio de

7. Los programas del arzobispo Carranza, la acción del Santo Oficio en Toledo y la crítica a la Inquisición (1558-1559) - López Vela, Roberto

8. Fuentes documentales para el estudio de la Inquisición en el Archivo Municipal de Tudela - Pérez Ochoa, Iñigo; Pérez Sánchez, Beatriz

9. Inquisición y ciencia. La suerte de la olla - Henningsen, Gustav

10. Judaizantes y textos hebreos en el Tribunal de la Inquisición de Navarra: el proceso de fe contra Martín López (1520-1521) - Nogal Fernández, Rocío de la; Barco, Francisco Javier del

11. El Consejo de Castilla y las brujas de Vizcaya. Un ejemplo del desarrollo competencial del Consejo Real en el siglo XVII - Bernal Alonso, Eva

12. Fuentes documentales para el estudio de la actividad procesal del Santo Oficio: el Tribunal Inquisitorial de Navarra - Panizo Santos, Juan Ignacio

13. Sexual reproduction in the invasive octocoral Carijoa Riisei in Hawaii - Kahng, Samuel E.; Benayahu, Yehuda; Wagner, Daniel; Rothe, Nina
Since its initial discovery on Oahu in 1966, the azooxanthellate octocoral, Carijoa riisei (Duchassaing and Michelotti, 1860), has spread across the main Hawaiian Islands and proliferated in abundance. To help understand the substantial ecological success of C. riisei in Hawaii, its sexual reproduction was examined. Carijoa riisei is gonochoric with a male to female ratio of one. Gametogenesis is asynchronous, continuous, and does not exhibit seasonal or lunar periodicity. Carijoa riisei spawns negatively buoyant eggs which suggests external fertilization and possibly benthic larvae. Under favorable conditions, C. riisei exhibits high polyp fecundity. Asynchronous, continuous spawning of gametes is an unusual...

14. Les services bancaires et d' assurances et les services informatiques dans les villes moyennes du Grand Sud-ouest français, logiques de déploiement et stratégies d' ancrage - Zuliani, Jean-Marc

15. Agentes locales y proyectos transfronterizos en el eje transpirenaico Barcelona-Toulouse - Oliveras González, Xavier; Durà Guimerà, Antoni

16. Toulouse face a La Garonne: emprise de l' urbanisation dans la plaine inondable et geohistoire des amenagements fluviaux - Valette, Philippe; Carozza, Jean-Michel

17. Enjeux et défis des politiques locales d' adaptation au changement climatique en Aquitaine - Rebotier, Julien

18. Reintegración de un terrritorio entre fronteras: El Alto Segre, Pirineos - Pallarès-Blanch, Marta; Tulla Pujol, Antoni Francesc; Vera Martín, Ana

19. Caracterización y valoración biogeográfica de los pinares PINUS UNCINATA del Karst de Larra (Alto Pirineo Navarro) para su ordenación y gestión - Lozano Valencia, Peio; Cadiñanos Aguirre, José Antonio; Latasa Zeballos, Itxaro; Meaza Rodriguez, Guillermo

20. Análisis de los proyectos y actores transfronterizos España-Francia en el periodo 2007-2013 - Feliu Torrent, Jaume; Berzi, M.; Rufi, J. Vicente; Casteñer Vivas, M.; Llussà Torra, Rafel

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